[PPT] - Summary of EPS Conference 2013 Jimmy M c Carthy University of PowerPoint Presentation

SLIDE 1

Summary of EPS Conference 2013

Jimmy McCarthy

University of Birmingham

27/11/2013 The 2013 European Physical Society Conference on High Energy Physics

Stockholm, Sweden, 18-24 July, 2013

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 1 / 44

SLIDE 2

Introduction

Summary of EPS-HEP 2013 MANY results presented over 6 days This is a biased summary The conference:

Stockholm, Sweden, 18-24 July, 2013 Highlights:

Reception at City Hall Invited talk from Peter Higgs Conference dinner at Vasa Museum

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 2 / 44

SLIDE 3

700 physicists present:

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 3 / 44

SLIDE 4

EPS HEPP Prize 2013

The 2013 High Energy and Particle Physics Prize, for an outstanding contribution to High Energy Physics, is awarded to the ATLAS and CMS collaborations,“for the discovery of a Higgs boson, as predicted by the Brout-Englert-Higgs mechanism”, and to Michel Della Negra, Peter Jenni, and Tejinder Virdee,“for their pioneering and outstanding leadership roles in the making of the ATLAS and CMS experiments”.

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 4 / 44

SLIDE 5

Higgs Physics

New Boson discovered July 2012. Is it the Higgs Boson?

Enough statistics now to start measuring.

Phys. Lett. B 716 (2012) 1
Phys. Lett. B 716 (2012) 30
J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 6 / 44

SLIDE 7

Higgs Physics

High statistics decay channels

H → ZZ Both experiments now have > 6σ in this channel alone. High resolution channel. mH = 124.3+0.6+0.5

−0.5−0.3 GeV

H → γγ High backgrounds. Sensitive to spin. CMS show similar results. Some tension in differential production spectra.

[GeV]

4l

m 100 150 200 250 Events/5 GeV 5 10 15 20 25 30 35 40

1

Ldt = 4.6 fb

∫

= 7 TeV s

1

Ldt = 20.7 fb

∫

= 8 TeV s

4l → ZZ* → H

Data 2011+ 2012 SM Higgs Boson =124.3 GeV (fit)

H

m Background Z, ZZ* t Background Z+jets, t Syst.Unc.

ATLAS

6.6σ (4.4σ exp.) 6.7σ (7.2σ exp.)

ATLAS Collaboration, arXiv:1307.1427 CMS PAS HIG-13-002

m =

Events / 2 GeV

2000 4000 6000 8000 10000 γ γ → H

1

Ldt = 4.8 fb

∫

= 7 TeV s

1

Ldt = 20.7 fb

∫

= 8 TeV s ATLAS Data 2011+2012 =126.8 GeV (fit) H SM Higgs boson m Bkg (4th order polynomial) [GeV] γ γ

m

100 110 120 130 140 150 160

Events - Fitted bkg

200
100

100 200 300 400 500

mH = 126.5 GeV signal significance: 7.4σ observed 4.3σ expected

[fb/GeV]

T

p / d

fid

σ d 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 Preliminary ATLAS

= 8 TeV s , γ γ → H

∫

1

dt = 20.3 fb L data

syst. unc.

H X ) + 8 Y P + OWHEG P NLO+PS ( H → gg H X ) + 1.0 ES HR NNLO+NNLL ( H → gg H t t + VH = VBF + H X

[GeV]

γ γ T

p Particle level 20 40 60 80 100 120 140 160 180 200

OWHEG Ratio to P

2

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 7 / 44

SLIDE 8

Higgs Physics

Associated production

Starting to add different production mechanisms into the mix.

Associated production with a vector boson (VH).

Observed in WH channel.

Other mechanisms (i.e. VBF): searched still ongoing.

Slide Greg Landsberg - Higgs Bosons in the SM and Beyond - EPS 2013

Adding VH(WW)

✦ A bit extra help from the VH(WW) in 3-

lepton (ATLAS+CMS), 4-lepton (ATLAS), and lljj (CMS) final states

✦ ATLAS: combination with the H(WW)

analysis:

๏ 4.0σ (3.8σ exp.) significance at

mH = 125 GeV

25 [GeV]

H

m

110 120 130 140 150 160 170 180 190 200 SM

σ / σ 95% CL Limit on

1 10

2

10 Obs. Exp. σ 1 ± σ 2 ±

1

Ldt = 20.7 fb

∫

= 8 TeV: s

1

Ldt = 4.7 fb

∫

= 7 TeV: s

ATLAS Preliminary

3 or 4 leptons → VWW → VH

eV

liminary

3 or 4 leptons → VWW → VH

ATLAS-CONF-2013-075 Higgs mass [GeV]

110 120 130 140 150 160 170 180 190 200

SM

σ / σ 95% CL limit on

1 10

2

10 CMS preliminary

(shape-based) ν 3l3 → VH (8 TeV)

1

(7 TeV) + 19.5 fb

1

L = 4.9 fb

bserved

median expected σ 1 ± expected σ 2 ± expected

CMS PAS HIG-13-009 Higgs mass (GeV)

110 115 120 125 130 135 140 SM

σ / σ 95% CL limit on

5 10 15 20 25 30 35

median expected σ 1 ± expected σ 2 ± expected

bserved

= 8 TeV s

1

L = 19.5 fb CMS preliminary

CMS PAS HIG-13-009

V(jj)H(WW) W(lν)H(WW) W(lν)H(WW) + Z(ll)H(WW)

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 8 / 44

SLIDE 9

Higgs Physics

Spin-Parity measurements

Spin-Parity of the SM model Higgs boson should be JP = 0+. Test against various hypotheses: 0−, 1+, 1−, 2+. J = 1 states disfavoured by Landau/Yang.

Observation of H → γγ.

H → ZZ used to rule out JP = 0−

ATLAS at 97.8% C.L. CMS at 99.8% C.L.

Graviton-like JP = 2+ ruled out.

ATLAS >99.9% (γγ + ZZ + WW ) CMS 99.4% (ZZ + WW )

q

15
10
5

5 10 15 Normalised to unity 0.05 0.1 0.15 0.2 0.25 Data

+

= 0

P

J

= 0

P

J ATLAS 4l → ZZ* → H

1

Ldt = 4.6 fb

∫

= 7 TeV s

1

Ldt = 20.7 fb

∫

= 8 TeV s

)

+

/ L

ln(L

×

2
30
20
10

10 20 30 Pseudoexperiments 0.02 0.04 0.06 0.08 0.1

CMS preliminary

1

= 8 TeV, L = 19.6 fb s

1

= 7 TeV, L = 5.1 fb s +

CMS data
q

)

+

/ L

(gg) m + 2

ln(L ×

2
30
20
10

10 20 30 Probability density 0.02 0.04 0.06 0.08 0.1

CMS preliminary

1

= 8 TeV, L = 19.6 fb s

1

= 7 TeV, L = 5.1 fb s + (gg) m + 2 CMS data = 0.6%)

bs.

s (CL

Both experiments favour SM quantum numbers.
J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 9 / 44

SLIDE 10

Higgs Physics

Signal Strength µ = σ/σSM

µ

– γγµ ττ – γγ, ττµ – γγ, ττµ

)
Signal strength (
0.5

0.5 1 1.5 2 ATLAS

1

Ldt = 4.6-4.8 fb

= 7 TeV

s

1

Ldt = 13-20.7 fb

= 8 TeV

s

= 125.5 GeV

H

m

arXiv:1307.1427 0.28

0.33

+

= 1.55

H

0.12

0.17

+ 0.13

0.17

+ 0.22

0.23

+ arXiv:1307.1427 0.35

0.40

+

= 1.43

4l
ZZ*
H

0.10

0.17

+ 0.13

0.20

+ 0.32

0.35

+ arXiv:1307.1427 0.28

0.31

+

= 0.99

l
l
WW*
H

0.09

0.15

+ 0.19

0.23

+ 0.21

0.20

+ arXiv:1307.1427 0.18

0.21

+

= 1.33

, ZZ*, WW*
H

Combined

0.10

0.12

+ 0.13

0.17

+ 0.14

0.13

+ 0.6

0.7

+

= 0.2

Preliminary

b b

W,Z H

<0.1 0.4

0.5
ATLAS-CONF-2013-079

0.6

0.7

+

= 0.7

Preliminary

)

1

(8TeV: 13 fb

H

ATLAS-CONF-2012-160

Total uncertainty

n
1
(stat)
(sys)
(theo)
SM

σ / σ Best fit

0.5 1 1.5 2 2.5

0.28 ± = 0.92 µ

ZZ → H

0.20 ± = 0.68 µ

WW → H

0.27 ± = 0.77 µ

γ γ → H

0.41 ± = 1.10 µ

τ τ → H

0.62 ± = 1.15 µ

bb → H

0.14 ± = 0.80 µ

Combined

1

19.6 fb ≤ = 8 TeV, L s

1

5.1 fb ≤ = 7 TeV, L s

CMS Preliminary = 0.65

SM

p = 125.7 GeV

H

m

CONF-2013-079

9 NF-2012- 012 012 012 01 01 160 60 S-CON

Br)/SM
Best Fit (

1 2 3 4 5 6 7 8 9 10

b Vb

VH
+
H
W

+

W

H
H

Combined (68% C.L.) Single channel

1

10 fb

int

Tevatron Run II, L mH=125 GeV/c2

arXi arXi arXi arXiv:13 v:13 v:13 v:1307.1 07.1 07.1 07.1427 427 427 427 0.18

0.21

+

= 1.33

, ZZ*, WW*
H

Combined

0.10

0.12

+ 0.13

0.17

+ 0.14

0.13

+

0.14 ± = 0.80 µ

Combined

CM p

) Combined (68% C.L.) Single channel

H

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 10 / 44

SLIDE 11

Top Physics

Top Pair Production

LHC is a top factory: ATLAS: σt¯

t = 232 ± 2(stat) ± 31(syst) ± 9(lumi) pb

Differential cross-sections measured:

Consistent with theoretical models.

Mass measurements

ATLAS measured using a 3D fit to Mreco

top , Mreco W , and Rreco lb

. CMS using a lifetime-based technique.

s t

t t

/dy

t t

σ d

t t

σ 1/

1

10 1 data NLO (MCFM) ALPGEN MC@NLO ATLAS

1

L dt = 2.05 fb

∫

t t

y

3
2
1

1 2 3 Theory/Data 1 1.2

ATLAS: Mtop = 172.31 ± 0.23(stat) ± 0.27(JSF) ± 0.67(bJSF) ± 1.35(syst) GeV CMS: Mtop = 173.5 ± 1.5(stat) ± 1.3(syst) ± 2.6(pT) GeV

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 12 / 44

SLIDE 13

Top Physics

Spin Correlations

Spins of top and anti-top are correlated in SM.
Short top quark lifetime (∼ 5 × 10−25 s) means spin information is

carried on to decay products.

φ ∆ 0.5 1 1.5 2 2.5 3 Events 100 200 300 400 500 600 700 800 900 data (SM) t t (uncorrelated) t t single top *+jets γ Z/ diboson fake leptons ATLAS

1

Ldt = 2.1 fb

∫

Measure fraction of SM-like

events, f SM, using template fit to ∆φ(ℓℓ) distribution.

f SM = 0 → no correlations.
f SM = 1 → correlations (SM).

ATLAS: f SM = 1.30 ± 0.14+0.27 −0.22 → 5.1σ

Phys. Rev. Lett. 108, 212001 (2012)

CMS: f SM = 0.74±0.08(stat)±0.24(syst) CMS-TOP-12-004 D0: f SM = 0.85 ± 0.29 → 3.1σ

Phys. Rev. Lett. 108, 032004 (2012)

SARA STRANDBERG, STOCKHOLM UNIVERSITY P . 21 EPSHEP 2013, STOCKHOLM, JULY 22, 2013

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 13 / 44

SLIDE 14

Top Physics

Single Top Production

Single-top production occurs in several channels.

t-channel production already observed at Tevatron and LHC. New: Evidence for s-channel production at D0. New: Observation of Wt-channel process at CMS.

Ranked s-channel discriminant 0.7 0.8 0.9 1 Yield [Events/0.04] 10 20 30 40 50

1

DØ 9.7 fb (b) Ranked s-channel discriminant 0.7 0.8 0.9 1 Yield [Events/0.04] 10 20 30 40 50

Data tb tqb W+jets Z+jets/Diboson t t Multijets

tb cross section [pb] 1 2 3 4 5 tqb cross section [pb] 1 2 3 4 5

Measurement SM Four generations Top-flavor Top pion FCNC

1 SD 2 SD 3 SD tb cross section [pb] 1 2 3 4 5 tqb cross section [pb] 1 2 3 4 5

1

DØ 9.7 fb (a)

σ = 23.4+5.5

−5.4 pb

6.0σ significance

BDT output

1
0.8
0.6
0.4
0.2

0.2 0.4

Events / 0.03 20 40 60 80 100

ATLAS Dilepton 1 jet = 7 TeV s

1

L dt = 2.05 fb

∫

Data JES uncertainty Wt t t WW/ZZ/WZ )+jets µ µ Z(ee/ )+jets τ τ Z( Fake dileptons

σ = 16.8 ± 2.9(stat) ± 4.9(syst) pb 3.3σ significance

CMS-PAS-TOP-12-040

Phys. Lett. B 716, 142 (2012)

Also lots of activity looking for new physics with top quarks:

CP Violations, FCNC, Baryon Number Violation etc.

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 14 / 44

SLIDE 15

Heavy Ions

Heavy Ion Collisions

Recently results from LHC compare Pb-Pb and p-p collisions.

Looking for signatures of new states of matter e.g Quark Gluon Plasma (QGP) Uses p-p collisions as a control channel. Problem is big differences between Pb-Pb and p-p collisions.

Recent run at LHC in 2013 dedicated to investigating p-Pb collisions.

Disentangle initial state effects. Highlights any effects to to cold nuclear matter. Lets LHCb into the Heavy Ion game!

Collide p-Pb and Pb-p to get forward and backward measurements.

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 16 / 44

SLIDE 17

Heavy Ions

Baryon Anomaly

Enhanced ratio of Λ/K 0

S at medium pT.

Observed in Pb-Pb collisions. Also observed at RHIC. More enhanced for more central collisions.

Crucially: not observed in p-Pb collisions
J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 17 / 44

SLIDE 18

Heavy Ions

Nuclear Modification Factor

RAA = Yield in AA Yield in pp × 1 Ncoll

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 18 / 44

SLIDE 19

Flavour Physics

B0

(s) → µ+µ− LHCb and CMS both presented results in the search for these rare decays. Will concentrate on details of LHCb analysis Interesting decays:

FCNC process: forbidden at tree level. New physics/particles enter via the loops. Theoretically very clean. |Vts| > |Vtd| = ⇒ B0 decay supressed

−

H b

+

µ

+

t t W ,

+

µ B d/s

d/s

Z , H,h ... W ,

+

µ− W , µ

−

χ ~ ~ ~

+

ν

+ −

t,c,u q ~ l χ d/s

B

d/s

b

Branching fractions predicted in SM using Lattice QCD: B(B0

s → µ+µ−)SM = (3.57 ± 0.9) × 10−9

B(B0 → µ+µ−)SM = (1.07 ± 0.1) × 10−10

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 21 / 44

SLIDE 22

Flavour Physics B0 (s) → µ+µ−

LHCb Analysis

LHCb presented first evidence (3.5σ) for B0

s → µ+µ− based on 2011 data.

Now analysing full 3 fb−1 2011 + 2012 dataset. Analysis performed blind. Using a Boosted Decision Tree (BDT).

Uses kinematic and geometric variables. Trained using Monte Carlo calibrated to data.

Unbinned maximum likelihood fit performed in bins of BDT response.

vs

Bs→µ+µ– B0→µ+µ–

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 22 / 44

SLIDE 23

Flavour Physics B0 (s) → µ+µ−

Normalisation

Two normalisation channels used to control systematics.

B+ → J/ψ(µ+µ−)K + B0 → K +π−

Use these to measure relative branching fractions. B = Bcal × ǫRECO

cal

×ǫSEL

cal

ǫRECO

sig

×ǫSEL

sig

× ǫTRG

cal

ǫTRG

sig

× fcal

fd(s) × Nsig Ncal = α(s) × Nsig

Reco and sel efficiencies calculated from Monte Carlo, cross checked on data. Trigger efficiencies calculated from data sample of J/ψ → µ+µ−.

fd fs dominant systematic for B0 s → µ+µ−.

α measured for each control channel and averaged: αs = (9.41 ± 0.65) × 10−11 α = (2.4 ± 0.09) × 10−11

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 23 / 44

SLIDE 24

Flavour Physics B0 (s) → µ+µ−

Results from LHCb

UML fit to data, integrated over last 3 BDT bins: Significance of signal = 4.0σ

]

2

c [MeV/

µ

+

µ

m 5000 5500 )

2

c Candidates / (44 MeV/ 2 4 6 8 10 12 14 16 LHCb BDT>0.7

1

3 fb

B(B0

s → µ+µ−) = (2.9+1.1 −1.0(stat)+0.3 −0.1(syst)) × 10−9

Significance of the B0 signal is only 2.0σ. B(B0 → µ+µ−) = (3.7+2.4

−2.1(stat)+0.6 −0.4(syst)) × 10−10

Use CLs method to place an upper limit on the branching fraction: B(B0 → µ+µ−) < 6.3 (7.4) × 10−10 at 90% (95%) CL

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 24 / 44

SLIDE 25

Flavour Physics B0 (s) → µ+µ−

Results from CMS

CMS employs a similar analysis strategy. Significance of signal = 4.3σ

(GeV)

µ µ

m

4.9 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9

Events / ( 0.04 GeV )

1 2 3 4 5 6 7 8 = 8 TeV - Endcap s

1

CMS - L = 20 fb 0.33 < BDT < 0.45 data full PDF

µ

+

µ →

s

B

µ

+

µ → B combinatorial bkg semileptonic bkg peaking bkg

(GeV)

µ µ

m

4.9 5 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9

S/(S+B) Weighted Events / ( 0.04 GeV)

10 20 30 40 50 = 8 TeV s

1

= 7 TeV, L = 20 fb s

1

CMS - L = 5 fb data full PDF

µ

+

µ →

s

B

µ

+

µ → B combinatorial bkg semileptonic bkg peaking bkg

et

B(B0

s → µ+µ−) = (3.0+0.9 −0.8(stat)+0.6 −0.4(syst)) × 10−9

Significance of the B0 signal is only 2.0σ. B(B0 → µ+µ−) = (3.5+2.1

−1.8) × 10−10

Use CLs method to place an upper limit on the branching fraction: B(B0 → µ+µ−) < 1.1 × 10−9 at 95% CL

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 25 / 44

SLIDE 26

Flavour Physics B0 (s) → µ+µ−

Combined results

Very quick work from LHCb and CMS to combine results. LHCb-CONF-2013-012 Haven’t combined significance of signal properly, but clearly > 5σ No combined limit on B0 → µ+µ−. B(B0

s → µ+µ−) = (2.9 ± 0.7) × 10−9

B(B0 → µ+µ−) = (3.6+1.6

−1.4) × 10−10

What does this mean for SUSY?

adapted from arXiv:1012.3893

Significantly constrains parameter space of

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 26 / 44

SLIDE 27

Flavour Physics b → sll transitions

B0 → K ∗µ+µ−

b → s transitions are FCNC. New physics can alter angular correlations.

Altmannshofer et al. (2008)

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 28 / 44

SLIDE 29

Flavour Physics b → sll transitions

Results I

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 29 / 44

SLIDE 30

Flavour Physics b → sll transitions

Results II

Forward-backward asymmetry of particular interest.

Crossing point sensitive to new physics. LHCb present first measurement.

q2

0 = 4.9 ± 0.9 GeV2/c2

q2 SM = 3.95 ± 0.38 GeV2/c2

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 30 / 44

SLIDE 31

Flavour Physics b → sll transitions

New Angular Variables

Theorists propose new angular variables

Slightly less dependant on form factor models.

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 31 / 44

SLIDE 32

Flavour Physics b → sll transitions

Results III

NEW

Results for new observables

LHCb Preliminary LHCb Preliminary

LHCb collaboration (1fb-1), LHCb-PAPER-2013-037 Some tension between measurement and theory for P′

5

≈ 2.8σ when consider 24 independant measurements.

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 32 / 44

SLIDE 33

Flavour Physics b → sll transitions

Λ0

b → Λµ+µ− Other b → s decays available.

B0 → K 0µ+µ−, B0

s → φµ+µ−, Λ0 b → Λµ+µ− ...

First results from LHCb for Λ0

b → Λµ+µ− shown:

Λ0

b → ΛJ/ψ as control channel.

Differential branching fraction measured in q2 bins. Total of 80 events in all bins.

B(Λ0

b → Λµ+µ−) = (0.96 ± 0.16(stat) ± 0.13(syst) ± 0.21(norm)) × 10−6

Predictions from Detmold et al. (2012)

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 33 / 44

SLIDE 34

Flavour Physics Λ0 b → Λη(′)

Introduction

Search for Λ0

b → Λη′ and Λ0 b → Λη.

Investigate the phenomena of η–η′ mixing.

η(′) mass eigenstates described by mixing of flavour eigenstates.

|η |η′

=

cos φp − sin φp sin φp cos φp |ηq |ηs

.

|ηq = 1 √ 2|uu + dd |ηs = |ss

Introduce gluonic component to η′ wavefunction.

Has interesting consequences for branching fractions.

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 35 / 44

SLIDE 36

Flavour Physics Λ0 b → Λη(′)

Branching Fractions

Extra Feynman Diagrams available for η′ decays = ⇒ interference!

B(B0 → K 0η′) = (66 ± 4) × 10−6 B(B0 → K 0η) = (1.23+0.27

−0.24) × 10−6

Measure relative branching ratio of B → Xη′ to B → Xη decays. Many different decays needed to measure φp and φG No baryonic decay yet observed. Expected: B(Λ0

b → Λη(′)) ≈ (2 − 40) × 10−6 arxiv:hep-ph/0305031

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 36 / 44

SLIDE 37

Flavour Physics Λ0 b → Λη(′)

Analysis

Based on LHCb-CONF-2013-010

Preliminary results presented. Using 2012 dataset (2 fb−1). Search for Λ0

b → Λη′.

Using B0 → K 0

Sη′ as control channel.

Reconstruct η′ → π+π−γ, K 0

S → π+π− Λ→ pπ−

Selection is cut-based preselection + BDT. PID selection to separate π K and p.

Data reweighted by PID efficiency.

Selection different depending where the K 0

S /Λ decays.

Upstream of VeLo: Long-Long selection (LL). Downstream of VeLo: Down-Down selection (DD).

Selection optimised separately for two categories.

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 37 / 44

SLIDE 38

Flavour Physics Λ0 b → Λη(′)

Boosted Decision Tree (BDT)

Takes many variables which discriminate between signal and background Combines them into one powerful discriminant (BDT response) Trained using signal MC and data sidebands to model the background

Particle Variables B0 (Λ0

b)

pT, log(FD χ2), log(τχ2), log(1 - DIRA Angle), Decay Vertex χ2 K 0

S (Λ0)

p, log(IP χ2), log(FD χ2) η′ pT, log(IP χ2) γ log(ET )

BDT Response (LL) BDT Response (DD)

BDT response

0.6
0.4
0.2

0.2 0.4 dx / (1/N) dN 1 2 3 4 5

Kolmogorov-Smirnov test: signal (background) probability = 0.352 ( 0.55) U/O-flow (S,B): (0.0, 0.0)% / (0.0, 0.0)%

TMVA overtraining check for classifier: BDT BDT response

0.6
0.4
0.2

0.2 dx / (1/N) dN 1 2 3 4 5 Signal (test sample) Background (test sample) Signal (training sample) Background (training sample)

Kolmogorov-Smirnov test: signal (background) probability = 0.877 (0.968) U/O-flow (S,B): (0.0, 0.0)% / (0.0, 0.0)%

TMVA overtraining check for classifier: BDT

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 38 / 44

SLIDE 39

Flavour Physics Λ0 b → Λη(′)

Normalisation

Measuring ratio of branching fractions:

R = B(Λ0

b → Λ0η′)

B(B0 → K 0η′) = NS(Λ0

b)

NS(B0) × ǫacc(B0) ǫacc(Λ0

b) × ǫtot(B0)

ǫtot(Λ0

b) × fd

fΛb × 0.5 × B(K 0

S → π+π−)

B(Λ0 → pπ−) Production fractions measured by LHCb Function of pT Largest systematic uncertainty (27%) fΛb (fu + fd) = (0.404 ± 0.109) × [1 − (0.031 ± 0.005) × pT(GeV)] fΛb (fu + fd) = 0.319 ± 0.086 = ⇒ fd fΛb = 1.57 ± 0.42 Ratio of selection efficiencies (ǫ) measure using Monte Carlo Second dominant systematic uncertainty (22%) Easily improved with more Monte Carlo

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 39 / 44

SLIDE 40

Flavour Physics Λ0 b → Λη(′)

Mass fits to B0

Selection applied to data and fit performed to reweighted B0 mass.

)

2

c ’) ( MeV/

s

M(K 4900 5000 5100 5200 5300 5400 5500 5600 5700 5800 )

2

c Candidates / ( 30 MeV/ 10 20 30 40 50 60

LHCb Preliminary

Data Fit Model ’

s

K

B

Combinatoric Background )

2

c ’) ( MeV/

s

M(K 4900 5000 5100 5200 5300 5400 5500 5600 5700 5800 )

2

c Candidates / ( 30 MeV/ 10 20 30 40 50

LHCb Preliminary

Data Fit Model ’

s

K

B

Combinatoric Background

N(LL)=125 ± 13(14.8σ) N(DD)=75 ± 12(11.7σ)

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 40 / 44

SLIDE 41

Flavour Physics Λ0 b → Λη(′)

Mass fits to Λ0

b After unblinding, no significant signal is observed. All parameters in signal model fixed to MC values. Yield left to float. Number of events extracted from fit used to place a limit on branching fraction.

)

2

c ’) ( MeV/

M(

5000 5200 5400 5600 5800 6000 6200 )

2

c Candidates / ( 50 MeV/ 2 4 6 8 10 12 14 LHCb Preliminary Data Fit Model Combinatoric Background )

2

c ’) ( MeV/

M(

5000 5200 5400 5600 5800 6000 6200 )

2

c Candidates / ( 50 MeV/ 2 4 6 8 10 12 LHCb Preliminary Data Fit Model Combinatoric Background

N(LL)=1 N(DD)=–3

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 41 / 44

SLIDE 42

Flavour Physics Λ0 b → Λη(′)

Limits

Use Feldman-Cousins method and information from the fit to set an upper limit on branching fraction. Absolute branching fraction using B(B0 → K 0

S η′) = 66 × 10−6.

R = B(Λ0

b→Λ0η′)

B(B0→K 0η′) < 9.6 × 10−2 at 90% CL

B(Λ0

b → Λ0η′) < 6.3 × 10−6 at 90% CL

c.f. Theoretical prediction: Expected: B(Λ0

b → Λη(′)) ≈ (2 − 40) × 10−6 arxiv:hep-ph/0305031

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 42 / 44

SLIDE 43

Conclusions

All measurements are consistent with Standard Model predictions

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 44 / 44

SLIDE 45

Back-Up Slides

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 45 / 44

SLIDE 46

spectrum is harder, the results may be biased

[fb/GeV]

T

p / d

fid

σ d 0.2 0.4 0.6 0.8 1 1.2 Preliminary ATLAS

= 8 TeV s , γ γ → H

∫

1

dt = 20.3 fb L data

syst. unc.

H X ) + 8 Y P + OWHEG P NLO+PS ( H → gg H X ) + 8 Y P HJ+ INLO M +1j NLO+PS ( H → gg H t t + VH = VBF + H X [GeV] T,jet1 p Particle level 20 40 60 80 100 120 140 OWHEG Ratio to P 1 2 3 [fb] φ ∆ / d fid

σ d 2 4 6 8 10 12 Preliminary ATLAS

= 8 TeV s , γ γ → H

∫

1

dt = 20.3 fb L data

syst. unc.

H X ) + 8 Y P + OWHEG P NLO+PS ( H → gg H X ) + 8 Y P HJ+ INLO M +1j NLO+PS ( H → gg H t t + VH = VBF + H X jj φ ∆ Particle level 0.5 1 1.5 2 2.5 3 OWHEG Ratio to P 5 2

ATLAS-CONF-2013-072

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 46 / 44

SLIDE 47 Slide Greg Landsberg - Higgs Bosons in the SM and Beyond - EPS 2013

H(WW→lνlν)

✦ High-yield, low-

resolution channel

๏ Most discriminating

variables: Mll and MT (dilepton transverse mass)

๏ Search done in 0-, 1-,

and 2-jet categories; in the ee, eµ, and µµ channels ✦ ATLAS: fit to the MT distribution ✦ CMS: 2D analysis in Mll

vs. MT for the eµ channel

and cut-based analysis for the same-flavor channels (also as a cross-check in eµ)

23 Events / 10 GeV 100 200 300 400 500 600 700 Data 2012 Total sig.+bkg. SM Higgs boson = 125 GeV H m WW t t W+jets Other VV Single Top * γ Z/ ATLAS

1

Ldt = 20.7 fb ∫ = 8 TeV s + 0 jets ν µ ν e → WW* → H [GeV] ll m 50 100 150 200 250 Data / bkg. 0.6 0.8 1 1.2 1.4 Data 2012 SM sig.+bkg. Events / 10 GeV 100 200 300 400 500 600 700 800 Data 2011+2012 Total sig.+bkg. SM Higgs boson = 125 GeV H m WW t t Other VV Single Top W+jets * γ Z/ ATLAS

1

Ldt = 4.6 fb ∫ = 7 TeV s

1

Ldt = 20.7 fb ∫ = 8 TeV s + 0/1 jets ν l ν l → WW* → H [GeV] T m 60 80 100 120 140 160 180 200 220 240 260 Data - Bkg.

20

20 40 60 80 100

Bkg. subtracted data

= 125 GeV H SM Higgs boson m ] 2 [GeV/c m 50 100 150 200 250 300 2 events / 10 GeV/c 200 400 600 800 1000 data =125 GeV H m H125 W+jets VV Top * γ Z/ WW syst. ⊕ stat. CMS Preliminary

1

= 8 TeV, L = 19.5 fb s

1

= 7 TeV, L = 4.9 fb s µ 0-jet e ] 2 [GeV/c ll m 100 200 300 data / MC 0.5 1 1.5 2 2.5 ] 2 [GeV/c T E ll- m 50 100 150 200 250 2 events / 10 GeV/c 50 100 150 200 250 data =125 GeV H m H125 W+jets VV Top * γ Z/ WW syst. ⊕ stat. CMS Preliminary

1

= 8 TeV, L = 19.5 fb s

1

= 7 TeV, L = 4.9 fb s µ 0-jet e ] 2 [GeV/c T E ll- T m 50 100 150 200 250 data / MC 0.5 1 1.5 2 2.5 [G ll m 100 200 2 V/c

CMS PAS HIG-13-003

50 100 150 200 GeV 800 Da ATLAS ATLAS Collaboration arXiv:1307.1427

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 47 / 44

SLIDE 48 Slide Greg Landsberg - Higgs Bosons in the SM and Beyond - EPS 2013

H(ττ) in CMS

✦ Updated to full statistics; based on eμ,

μμ, eτh, μτh, and τhτh channels

✦ Analysis is done separately in 0-, 1-,

and 2-jet (VBF) categories

๏ 0- and 1-jet categories are

each split in two, depending

n the pT of the τ-decay products

๏ τhτh doesn’t use 0-jet category and the

1- and 2-jet categories are not split ✦ Also include VH(ττ) channels ✦ Optimized ττ mass reconstruction (SVFIT) with ~20% resolution ✦ Benefits significantly from particle-flow reconstruction

31

w

[GeV]

τ τ

m 100 200 300 [1/GeV]

τ τ

S/B Weighted dN/dm

200 400 600 800 1000 τ τ → H(125 GeV)

bserved

τ τ → Z t t electroweak QCD [GeV] τ τ m 100 150 20 40 τ τ → H(125 GeV) Data - Background

Bkg. Uncertainty
1

= 7-8 TeV, L = 24.3 fb s CMS Preliminary, h τ h τ , h τ µ , h τ e , µ e

Embedding (replace µ with simulated τ in Z(µµ) sample); normalization from Z(µµ) (5% syst.) Dominated by W+jets; shape from simulation; normalization from control regions (10-20% syst.) QCD: from SS sample (10% syst.)

CMS PAS HIG-13-004

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 48 / 44

SLIDE 49 Slide Greg Landsberg - Higgs Bosons in the SM and Beyond - EPS 2013

H(Zγ) Results

35

✦ Similar branching fraction to H(γγ), but an additional price to pay for the

leptonic branching fraction of the Z

✦ Decay can be enhanced/suppressed independently of H(γγ) ๏ Sensitive to new physics via loops ✦ Not sensitive to the SM Higgs boson (yet), set the following limits: ๏ ATLAS: μ < 18.2 @ 95% CL (13.5 expected) ๏ CMS: μ < 10 @ 95% CL (10 expected)

[GeV] H m 120 125 130 135 140 145 150 )

Z
(H

SM

)/
Z
(H
95% CL limit on

5 10 15 20 25 30 35 40 45 Observed Expected

1
2
= 7 TeV

s ,

1

Ldt = 4.6 fb

= 8 TeV

s ,

1

Ldt = 20.7 fb

ATLAS Preliminary

(GeV)

H

m 120 125 130 135 140 145 150 155 160

SM

σ / σ 95% CL limit on 5 10 15 20 25 30 35 40

γ Z → H Observed σ 1 ± Expected σ 2 ± Expected CMS

1

= 7 TeV, L = 5.0 fb s

1

= 8 TeV, L = 19.6 fb s ATLAS Preliminary

ATLAS-CONF-2013-009

g

S

1

= 7 TeV, L = 5.0 fb s

1

= 8 TeV, L = 19.6 fb s

CMS Collaboration CERN-PH-EP-2013-113 to appear on the arXiv tomorrow

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 49 / 44

SLIDE 50 Slide Greg Landsberg - Higgs Bosons in the SM and Beyond - EPS 2013

H(µµ) Results

✦ Observing H(μμ) decay may be the only way to prove non-flavor-

universal couplings of the Higgs boson

๏ N.B. Coupling to charm is very hard to probe ✦ Requires very large statistics for observation: a strong case for HL-LHC ✦ First search has been done already by ATLAS ๏ Sets limit μ < 9.8 (8.2 expected) @ 95% CL

36 [GeV] H m 110 115 120 125 130 135 140 145 150 µ 95% CL Limit on 10 20 30 40 50 60 70 Observed

Bkg. Expected

σ 1 ± σ 2 ± = 8 TeV s

1

Ldt = 20.7 fb

∫

ATLAS Preliminary

µ

+ µ → H

ATLAS-CONF-2013-010

[GeV] µ µ m 80 100 120 140 160 180 200 Events / 0.5 GeV 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 10 10 ATLAS Preliminary (Simulation)

1

dt = 3000 fb L

∫

= 14 TeV s µ µ → Z X ν µ X ν µ → t t ν µ ν µ → WW =125 GeV H , m µ µ → H → gg 100 110 120 130 140 150 Events - Bkg / 2 GeV

5000

5000

ATLAS-PHYS-PUB-2012-004

SM: Br(H → µµ) = 2x10-4

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 50 / 44

SLIDE 51 Slide Events 20 40 60 80 100 120 140 160 180 200 EWK (40.4) + V (11.9) t t single t (17.3) (79.9) b + b t t + b (148.6) t t (146.9) c + c t t (288.7) t t Data (774.0) Sum MC (733.7) H125 (11.2x65.7) t t

1

= 8 TeV, L = 19.45 fb s 3 b-tags CMS Preliminary ≥ 3 jets + ≥ Dilepton + BDT output

0.8 -0.6
0.4
0.2

0.2 0.4 0.6 0.8 Data/MC 1 2 Greg Landsberg - Higgs Bosons in the SM and Beyond - EPS 2013

CMS Search in ttH(bb+ττ)

✦

New analysis; supersedes recent publication arXiv:1303.0763 based on 5+5 fb-1

๏ Updated to the full 2012 statistics (7 TeV not reanalyzed) and added the ττ decay

channel (8 TeV only)

๏ tt decays are reconstructed in the lepton+jets and dilepton channel; 2 or more b-

tagged jets required for the ttH(bb) search

๏ H(ττ) decays are looked for in τhτh channel, with tt decaying in lepton+jets, with 1 or 2

b-tagged jets

๏ Signal extraction via BDTs; separate BDTs for

each jet and b-tagged jet multiplicity

38 Events Events 10 20 30 40 50 60

1

= 8 TeV, L = 19.4 fb s CMS Preliminary 4 b-tags ≥ 6 jets + ≥ Lepton + 4 b-tags ≥ 6 jets + ≥ Lepton + + lf (71.1) t t (51.8) c + c t t + b (33.3) t t (78.2) b + b t t single t ( 7.3) + W,Z ( 5.8) t t EWK ( 1.4) Data (260) Sum MC (249.0) 30) × H125 ( 8.3 t t MVA output

0.8
0.6
0.4
0.2

0.2 0.4 0.6 Data/MC 1 2 Events 5 10 15 20 25 30 t t WW, WZ, ZZ W + jets Z + jets t single t/ + W/Z t t Collisions

Bkg. err.

100) × H(125) ( t t

1

= 8 TeV, L = 19.5 fb s 6 jets + 2 b-tags, CMS Preliminary, ≥ + h τ h τ BDT response

1
0.8
0.6
0.4
0.2

0.2 0.4 0.6 0.8 1 Data/MC 0.5 1 1.5 2 2.5

≥6 jets, 4 b-tags ≥3 jets, ≥3 b-tags ≥6 jets, 2 b-tags ttH(bb) ttH(bb) ttH(ττ)

1

= 8 TeV, L = 19.45 fb

1
1

s nary s 6 jets + 2 b-tags, CM ≥ + h τ h τ

CMS PAS HIG-13-019

8 TeV, L = 19.5 fb Prelimin

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 51 / 44

SLIDE 52 Slide (GeV) H

m

110 115 120 125 130 135 140 SM

σ / σ 95% CL limit on

2 4 6 8 10 Observed ttH(125) injected σ 1 ± Expected σ 2 ± Expected γ γ , τ τ , b CMS preliminary b

1

= 8 TeV, L = 19.5 fb s ;

1

= 7 TeV, L = 5.0 fb s Greg Landsberg - Higgs Bosons in the SM and Beyond - EPS 2013

ttH Combination

✦

CMS combined results:

๏

μ < 3.4 (2.7 expected) ✦ Would improve even more when additional channels are added and combined with ATLAS (once the analysis is updated) ✦ Closing on the SM Higgs boson sensitivity!

๏

Soon to become the 6th of the “big” channels and can be moved into “visible” category of my talk!

40 [GeV] H m 110 115 120 125 130 135 140 SM

/
95% CL Limit on

10 20 30 40 50 Preliminary ATLAS Observed (CLs) Expected (CLs)

1
2
1

Ldt = 4.7 fb

= 7 TeV,

s ) b b

H (H

t t 30

2
ATLAS-CONF-2012-135

ted

CMS PAS HIG-13-015 CMS PAS HIG-13-019 and arXiv:1303.0763

[GeV] H m 120 122 124 126 128 130 H t t SM

/

H t t

95% CL limit on

5 10 15 20 25 30 35 40 limit s CL Observed limit s CL Expected

1
2
ATLAS preliminary
H

H channels comb. t t = 8 TeV s Data 2012

1

Ldt = 20.3 fb

Breaking news - brand new ATLAS

ttH(γγ) 8 TeV result: μ < 5.3 (6.4 exp.)

/

H t t t 95% CL limit on

ATLAS-CONF-2013-080

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 52 / 44

SLIDE 53

Single Top Production

Direct probe of Wtb coupling and of

Vtb in CKM matrix.

Challenging, mainly due to

the background from W +jets.

Need MVA techniques.
s + t-channel production
bserved at CDF and D0 in

2009.

t-channel observed both at

Tevatron and LHC.

Evidence for s-channel

production at D0.

Observation of Wt-channel

production at CMS. (Evidence by both ATLAS and CMS 2012/2013.)

SARA STRANDBERG, STOCKHOLM UNIVERSITY P . 10 EPSHEP 2013, STOCKHOLM, JULY 22, 2013

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 53 / 44

SLIDE 54

New 3D Fit by ATLAS

[GeV] reco top m 140 160 180 200 220 normalized events / GeV 0.005 0.01 0.015 0.02 0.025 0.03 = 167.5 GeV top m = 172.5 GeV top m = 177.5 GeV top m ATLAS Preliminary = 7 TeV s Simulation, [GeV] reco W m 60 70 80 90 100 110 normalized events / GeV 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 ATLAS Preliminary = 7 TeV s Simulation, JSF = 0.95 JSF = 1.00 JSF = 1.05 reco lb R 0.5 1 1.5 2 2.5 3 normalized events / 0.1 0.01 0.02 0.03 0.04 0.05 bJSF = 0.95 bJSF = 1.00 bJSF = 1.05 ATLAS Preliminary = 7 TeV s Simulation,

3D fit to mreco

top , mreco W

and Rreco

lb .

Rreco,1b

lb

=

p

btag T

(p

Wjet1 T

+p

Wjet2 T

)/2

Rreco,2b

lb

=

p

bhad T

+p

blep T

p

Wjet1 T

+p

Wjet2 T

In-situ calibration of JES and bJES.
Systematic uncertainties reduced by

40% w.r.t. previous measurement.

[GeV] reco top m 130 140 150 160 170 180 190 200 210 220 Events / GeV 100 200 300 400 500 600 =7 TeV data s Best Fit background Best Fit GeV stat+JSF+bJSF 0.75 ± = 172.31 top m stat 0.003 ± JSF = 1.014 stat 0.008 ± bJSF = 1.006 ATLAS Preliminary

1

Ldt=4.7 fb

∫ mtop = 172.31 ± 0.23(stat) ± 0.27(JSF) ± 0.67(bJSF) ± 1.35(syst) GeV

SARA STRANDBERG, STOCKHOLM UNIVERSITY P . 16 EPSHEP 2013, STOCKHOLM, JULY 22, 2013

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 54 / 44

SLIDE 55

New Lifetime-Based Measurement by CMS

Lifetime-based technique, using

Lxy = γbβBτB ≈ 0.4 · mt

mB βBτB.

First used at CDF

.

Phys. Rev. D75, 071102 (2007)
Linear mass dependence,

∆Lxy/GeV = 25 − 30µm

Complementary systematics to

traditional measurements, e.g. minimal dependence on jet energy scale.

In each event, select secondary

vertex with largest Lxy.

Median,

Lxy, is used to extract mtop. mtop = 173.5 ± 1.5(stat) ± 1.3(syst) ± 2.6(pT (t)) GeV

SARA STRANDBERG, STOCKHOLM UNIVERSITY P . 17 EPSHEP 2013, STOCKHOLM, JULY 22, 2013

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 55 / 44

SLIDE 56

Top Forward-Backward and Charge Asymmetries

New physics in top sector can alter angular distributions.
Study forward-backward and charge asymmetries.

At¯

t F B = N(∆y > 0) − N(∆y < 0)

N(∆y > 0) + N(∆y < 0) At¯

t C = N(∆|y| > 0) − N(∆|y| < 0)

N(∆|y| > 0) + N(∆|y| < 0)

[GeV] t t m 100 200 300 400 500 600 700 800 900 C A

0.1
0.05

0.05 0.1 0.15 0.2 Unfolded SM Axigluon m=300 GeV Axigluon m=7000 GeV ATLAS Preliminary = 7 TeV s

1

L dt = 4.7 fb

∫

Phys. Rev. D 87 092002 (2013)
Phys. Lett. B 717, 129 (2012)

ATLAS-CONF-2013-078 with ∆y = yt − y¯ t with ∆|y| = |yt| − |y¯ t|

Tevatron At¯

t F B measurements in tension with SM at ∼ 2.5σ.

LHC At¯

t C measurements consistent with SM. SARA STRANDBERG, STOCKHOLM UNIVERSITY P . 19 EPSHEP 2013, STOCKHOLM, JULY 22, 2013

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 56 / 44

SLIDE 57

Top Quark Polarization

Top quarks in t¯

t events have negligible polarization in SM.

Can occur in BSM scenarios

(e.g. models with large FB asymmetry).

Polar angle of decay product

i distributed as: W(cos θi) = 1

2(1 + αiP cos θi)

P = degree of polarization, αi = spin-analyzing power.

At tree level, charged leptons

and down-type quarks from W-boson decays have αi = 1.

Fit cos θℓ distributions for

e and µ to extract αℓP. αlPCPC = −0.035 ± 0.014 ± 0.037 αlPCPV = 0.020 ± 0.016+0.013

−0.017 SARA STRANDBERG, STOCKHOLM UNIVERSITY P . 22 EPSHEP 2013, STOCKHOLM, JULY 22, 2013

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 57 / 44

SLIDE 58

gabor.veres@cern.ch EPS HEP 2013, Stockholm, 22nd July, 2013

9

Di-jet energy imbalance

Parton energy loss manifests itself as a pronounced

di-jet energy imbalance in central Pb+Pb collisions:

Pb Pb Pb Pb Pb Pb Pb Pb

pp

p p p p PRL 105 (2010) 252303

P. Kurt, HI, Fri 12:44

PRC 84 (2011) 024906

M. Lobodzinska, HI, Fri 12:28

Pb Pb Pb Pb

But jets are still back-to-back in ϕ:

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 58 / 44

SLIDE 59

gabor.veres@cern.ch EPS HEP 2013, Stockholm, 22nd July, 2013

9

Di-jet energy imbalance

Parton energy loss manifests itself as a pronounced

di-jet energy imbalance in central Pb+Pb collisions:

Pb Pb Pb Pb Pb Pb Pb Pb

pp

p p p p PRL 105 (2010) 252303

P. Kurt, HI, Fri 12:44

PRC 84 (2011) 024906

M. Lobodzinska, HI, Fri 12:28

Pb Pb Pb Pb

But jets are still back-to-back in ϕ:

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 59 / 44

SLIDE 60

Results for new observables

Good agreement with SM predictions (from J.Matias et al. arXiv:1303.5794)

NEW

LHCb Preliminary LHCb Preliminary LHCb Preliminary

LHCb collaboration (1fb-1), LHCb-PAPER-2013-037

J. McCarthy (University of Birmingham)

Summary of EPS 2013 27/11/2013 60 / 44

Summary of EPS Conference 2013

Introduction

EPS HEPP Prize 2013

Contents

Higgs Physics

High statistics decay channels

Associated production

Adding VH(WW)

Spin-Parity measurements

Signal Strength µ = σ/σSM

Contents

Top Pair Production

Spin Correlations

∫

Single Top Production

Contents

Heavy Ion Collisions

Baryon Anomaly

Nuclear Modification Factor

Contents

Contents

B0

LHCb Analysis

Normalisation

Results from LHCb

Results from CMS

Combined results

Contents

B0 → K ∗µ+µ−

Results I

Results II

New Angular Variables

Results III

Results for new observables

Λ0

Contents

Introduction

Branching Fractions

Analysis

Boosted Decision Tree (BDT)

Normalisation

Mass fits to B0

Mass fits to Λ0

Limits

Contents

Conclusions