[PPT] - Heavy flavor physics at CMS and D0 Ivan Heredia de la Cruz PowerPoint Presentation

SLIDE 1

Heavy flavor physics at CMS and D0

Ivan Heredia de la Cruz

CINVESTAV / CONACyT, Mexico RedFAE Workshop 2016 Nov 10th 2016, Pachuca, Hgo.

SLIDE 2

Ivan Heredia

Outline

Introduction
D0 & CMS detectors & the B physics program
CP-Violation in B0

s.

Bc meson decays.
B hadron properties.
Rare decays as new physics probes.
Exotic hadrons.
Summary and outlook

2 RED-FAE 2016

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B properties @ CMS -- Ivan Heredia

Introduction

LHC: pp collisions @ 7-8 (Run I) & 13 TeV (Run II) ⇒ large B

hadron production.

D0/Tevatron shut down in 2012. B/QCD program still continues.
Precise measurements of B hadrons properties help to improve
r constrain QCD models, and could provide signs of new

physics or constrain BSM models.

CMS is able to provide several measurements of B hadrons

properties that are competitive with results from other experiments, such as in:

B mesons and baryons: masses, lifetimes, BRs, polarizations, etc.
CP-Violation in B mesons.
B rare decays: branching ratios, angular parameters.
Decays to exotic hadrons.

3

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B properties @ CMS -- Ivan Heredia

D0 and CMS detectors

4

CMS B Physics program ⇿ Excellent µ ID + Track and vertex reconstruction

Tracking System Tracking System: Silicon, Fiber Tracker, : Silicon, Fiber Tracker, Solenoid, Central & Forward Solenoid, Central & Forward Preshowers Preshowers Shielding Shielding Fiber Tracker/ Fiber Tracker/Preshower Preshower VLPC Readout System VLPC Readout System N N S S Muon Toroid Muon Toroid Muon Muon Scintillation Scintillation Counters Counters Forward Mini- Forward Mini- Drift Tubes Drift Tubes PDTs PDTs Platform Platform CC CC EC EC EC EC

SLIDE 5

B properties @ CMS -- Ivan Heredia

B Physics Triggers (CMS/Run I)

5

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B properties @ CMS -- Ivan Heredia

B Physics Triggers (CMS/Run II)

6

CMS-DP-2015-055

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B properties @ CMS -- Ivan Heredia

B Physics Triggers (CMS/Run II)

7

CMS-DP-2015-055 B0

s ⇾ J/ψ φ (f0)

Bc

+ ⇾ J/ψ nπ±

Λb ⇾ J/ψ Λ(*) B ⇾ K(*) µ+ µ- B0

(s) ⇾ µ+ µ-

SLIDE 8

B properties @ CMS -- Ivan Heredia B0

s ⇾ J/ψ φ: ATLAS, CDF, CMS, D0.

B0

s ⇾ J/ψKK: LHCb.

B0

s ⇾ J/ψππ: LHCb.

B0

s ⇾ J/ψ DsDs: LHCb. [http://www.slac.stanford.edu/xorg/hfag/osc/summer_2015/ HFAG_phis_inputs.pdf]

CPV in  B0

s ⇾ J/ψ φ

CPV phase φs from interference btw direct and through mixing decays.
Non-standard particles in loops could change the SM prediction of φs.
3+1 angular-time analysis to disentangle CP-odd/even contributions.

8

CMS, PLB 757 (2016) 97–120

Κ−

where βs = arg(−VtsV ∗

tb/VcsV ∗ cb);

SLIDE 9

B properties @ CMS -- Ivan Heredia

B0

s ⇾ J/ψ f0(980)

CMS: CPV analysis is simplified using B0

s ⇾ J/ψ f0(π+π-) wrt B0 s ⇾

J/ψφ(K+K-) decays. It is also a pure CP-odd eigenstate.

9

Region around the f0(980) can be used to

measure τ(B0

s)CP-odd and φs.

SLIDE 10

B properties @ CMS -- Ivan Heredia

ℬ(B0

s⇾ψf0(ππ))/ℬ(B0 s⇾ψφ(KK))

10

Rf0/φ ≈ 0.2 [Stone & Zhang, PRD 79, 074024 (2009)].

CMS, PLB 756 (2016) 84–112

Experiments measure R in diff. M(π+π-) ranges.

LHCb [PRD 86, 052006 (2012)]*

CDF (PRD 84, 052012 (2011)) D0 [PRD 85, 011103(R) (2012)] LHCb [PLB 698 (2011) 115–122] * ] 2 ) [GeV/c

π

+ π

+

( s Invariant Mass B 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 ) 2 Events / (20 MeV/c 50 100 150 200 250 300 350 400 Signal Cross-feed Combinatorial contamination + B Total (a)

1

Proper Transverse Decay Length [cm] 0.05 0.1 0.15 0.2 0.25 0.3 m) µ Events / (100 1 10 2 10 3 10 Signal Cross-feed Combinatorial contamination + B Total (b)

1
Next important

property is Bs CP-

dd lifetime.
At DØ it was

measured:

] 2 [GeV/c

π

+ π Invariant Mass 0.8 0.85 0.9 0.95 1 1.05 1.1 1.15 1.2 ) 2 Events / ( 20 MeV/c 20 40 60 80 100 120 140

1

DØ, 10.4 fb Signal Background Total

τðB0

sÞ ¼ 1.70 0.14ðstatÞ 0.05ðsystÞ ps;

D0, PRD 94, 012001 (2016)

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B properties @ CMS -- Ivan Heredia

Bc

+ ⇾ J/ψ nπ±

Unique lab to study HQ dynamics.
b and c quarks competing in decay.
Measurements in a kin. region

complementary to LHCb.

11

CMS, JHEP 01 (2015) 063

LHCb, pT > 4 GeV, 2.5 < |η| < 4.5,

measures Rc/u = 0.68 ± 0.10 ± 0.03 ± 0.05 [PRL 109 (2012) 232001]. Difference expected sincepT(Bc

+)<pT (B +)in

central region.

LHCb measures RBc = 2.41 ± 0.30 ± 0.33

[PRL 108 (2012) 251802].

Predictions of RBc, assuming Bc⇾J/ψW

+*

and W

+*⇾ nπ +, btw = 1.5 – 2.3 [PRD 81

(2010) 014005, PRD 81 (2010) 014015].

First confirmation

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B properties @ CMS -- Ivan Heredia

B hadron lifetimes

B-lifetimes determine importance of

non-spectator contributions.

CMS about to publish precise

measurements:

12

Λb b u d c ¯ c s u d Λ J/ψ

D0: 2nd. most precise

τ(Bs) in flavor-specific Bs ⇾ Ds

μ

+ν X.

cτB+

=

491.6 ± 0.8 (stat) ± 1.8 (syst) µm cτB0

=

453.8 ± 1.6 (stat) ± 2.1 (syst) µm (in J/ψK∗0) cτB0

=

455.4 ± 2.7 (stat) ± 2.6 (syst) µm (in J/ψK0

S)

cτB0

s

=

504.3 ± 10.3 (stat) ± 3.3 (syst) µm (in J/ψπ+π−) cτB0

s

=

443.6 ± 2.0 (stat) ± 2.2 (syst) µm (in J/ψφ) cτΛ0

b

=

442.1 ± 8.1 (stat) ± 2.5 (syst) µm cτB+

c = 163.9 ± 7.4(stat) ± 3.0 (syst) µm

Not approved yet

PDG 491.1 ± 1.2 455.4 ± 1.5 455.4 ± 1.5 509.0 ± 12.0 434.9 ± 3.8

±

434.9 ± 3.8

443.4 ± 3.6

152.0 ± 2.7 X.X

0.1 − 0.05 − 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 data (data-fit)/ 4 − 2 − 2 4 m µ Candidates per 20 1 10 2 10 3 10 Data Total fit projection Signal fit projection Background fit projection /dof = 1.18 2 χ ,

1

D0 Epoch IV, 2.0 fb Pseudo Proper Decay Length (cm) 0.1 − 0.05 − 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 data (data-fit)/ 4 − 2 − 2 4 m µ Candidates per 20 1 10 2 10 3 10 Data Total fit projection Signal fit projection Background fit projection /dof = 1.18 2 χ ,

1

D0 Epoch IV, 2.0 fb Pseudo Proper Decay Length (cm)

vs. W.A. 453.0 ± 4.2 µm.

Þ ¼ 443.3 2.9ðstatÞ 6.3ðsystÞ μm, consistent with the current world average of

τfsðB0

sÞ ¼ 1

Γs 1 þ ðΔΓs=2ΓsÞ2 1 − ðΔΓs=2ΓsÞ2 ; D0, PRL 114, 062001 (2015)

SLIDE 13

b) Λ y(beam) - y( 1 2 3 4 5 6 7 8 9 10 (F) σ (B)/ σ R= 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8

D0 CMS LHCb

B properties @ CMS -- Ivan Heredia

B baryons

Apart from lifetime,

(hadro-)production measurements.

13

| y | 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 A

0.3
0.2
0.1

0.1 0.2 0.3 0.4 0.5 Signal Background HQ Drag HQ Recomb

1

D0 Run II, 10.4 fb 1.5 fm

CMS, PLB 714, 136 (2012)

D0, PRD 91, 072008 (2015)

y(Tevatron) = 7.64 y(LHC) = 8.92

R ¼ 0.92 0.12ðstatÞ 0.04ðsystÞ, the value of R . . stat

HQ-Drag

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B properties @ CMS -- Ivan Heredia

B baryons (II)

In CMS we measured the Lb polarization

and decay parameters of Λb ⇾J/ψ Λ.

14

dΓ dΩ3 (θΛ, θp, θµ) = Z π −π Z π −π dΓ dΩ5

θΛ, θp, θµ, φp, φµ
dφpdφµ

∼

8

∑

i=1 ηi | T++ |2, | T+0 |2, | T−0 |2, | T−− |2 ci (P, αΛ) fi

θΛ, θp, θµ
.

ˆ x1 ˆ x2 ˆ y2 ˆ z2 ˆ z1 ˆ y1 ˆ n ˆ n

Λ

Λb

p p p

J/ψ

µ− µ+

π

φp φµ θµ θp θΛ

i ηi ci fi 1 1 1 1 2 α2 αΛ cos θp 3

−α1

P cos θΛ 4

− (1 + 2γ0) /3

αΛP cos θΛ cos θp 5 γ0/2 1

3 cos2 θµ − 1
/2

6

(3α1 − α2) /4

αΛ cos θp

3 cos2 θµ − 1
/2

7

(α1 − 3α2) /4

P cos θΛ

3 cos2 θµ − 1
/2

8

(γ0 − 4) /6

αΛP cos θΛ cos θp

3 cos2 θµ − 1
/2

)[GeV] Λ ψ m(J/ 5.58 5.6 5.62 5.64 5.66 Events / ( 0.002 GeV ) 50 100 150 200 250 300 350 data fit signal model bkg model CMS Preliminary (7TeV) _1 (8TeV) + 5.2 fb _1 19.7 fb p θ cos 1 − 0.8 − 0.6 − 0.4 − 0.2 − 0.2 0.4 0.6 0.8 1 Events / ( 0.2 ) 100 200 300 400 500 600 700 800 data fit signal model bkg model CMS Preliminary (7TeV)

1

(8TeV) + 5.2 fb

1

19.7 fb Λ θ cos 1 − 0.8 − 0.6 − 0.4 − 0.2 − 0 0.2 0.4 0.6 0.8 1 Events / ( 0.2 ) 50 100 150 200 250 300 350 400 450 data fit signal model bkg model CMS Preliminary (7TeV) _1 (8TeV) + 5.2 fb _1 19.7 fb µ θ cos 1 − 0.8 − 0.6 − 0.4 − 0.2 − 0.2 0.4 0.6 0.8 1 Events / ( 0.2 ) 100 200 300 400 500 data fit signal model bkg model CMS Preliminary (7TeV)

1

(8TeV) + 5.2 fb

1

19.7 fb

P = 0.00 ± 0.06(stat) ± 0.02(syst), α1 = 0.12 ± 0.13(stat) ± 0.06(syst), α2 = −0.93 ± 0.04(stat) ± 0.04(syst), γ0 = −0.46 ± 0.07(stat) ± 0.04(syst), |T−0|2 = 0.51 ± 0.03(stat) ± 0.02(syst), |T+0|2 = −0.02 ± 0.03(stat) ± 0.02(syst), |T−−|2 = 0.46 ± 0.02(stat) ± 0.02(syst), |T++|2 = 0.05 ± 0.04(stat) ± 0.02(syst).

CMS PAS BPH-15-002

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B properties @ CMS -- Ivan Heredia

Rare B decays as new physics probes

Rare decays: FCNC decays forbidden @LO.

NP (in penguins/boxes) could modify Wilson coefficients.

Complementary info: S/P-S (B0

s⇾μ+μ-) vs. V/A-V

(B⇾K(*)μ+μ-) interactions.

Reliable BR predictions within the SM for

ℬ(B0

s⇾μ+μ-).

15

B0

s : 6.2σ

B0 : 3.0σ

π μ ν π μ ν μ ν μ ν

c

μ μ B0

s

Z0 b s μ+ μ– B0

s

→ μ+μ– μ μ μ μ μ μ ν μ μ μ μ ν μ μ μ μ

SLIDE 16

B(0)s→µ+μ-: Future

16

2022 2028

π μ ν π μ ν μ ν μ ν

c

μ μ B0

s

Z0 b s μ+ μ– B0

s

→ μ+μ– μ μ μ μ μ μ ν μ μ μ μ ν μ μ μ μ

SLIDE 17

B properties @ CMS -- Ivan Heredia

B0 ⇾ K*µ+µ-

Search for deviations of BR, FL (frac. of K*
longitudinal. Pol.) and AFB (μ+μ- F-B asym.) from

SM in bins of q2 = m2

μμ.

17

CMS consistent with other exps. and

with predictions of LCSR and Lattice. Ongoing efforts to measure P5’.

PLB 753 (2016) 424–448

SLIDE 18

THE XYZ STATES

More than 20 cc-like and bb-like

states that do not fit the qq̅ picture discovered in B-fact., Tev., & LHC.

Most happen to be near a 2-meson

threshold.

Most important: Z(4430)± → ψ(2S)π±

by Belle (2008), confirmed by LHCb (2014) to be a proper BW resonance by Argand diagram.

18 3.8 4.05 4.3 4.55 4.8 M(+) (GeV) 10 20 30 Events/0.01 GeV Belle (2008) Z(4430) 1 2 3 4 5 6 7 8 9 10 11 ) 2 Mass (MeV/c 2500 2750 3000 3250 3500 3750 4000 4250 4500 4750 5000 Open charm threshold Theory New States Established

+
1

++

2

++

1

++ +-

1

3
2
1
+

2

?

PC

J

S 1 1 S 3 2 P 3 1 P 3 P 3 1 P 1 3 D 3 2 D 3 1 D 3 2 D 1 ? ? ? J

L

(2S+1) (1S) c η (2S) c η ψ J/ (2S) ψ (4040) ψ (4415) ψ c2 χ c1 χ c0 χ c h (3770) ψ (4160) ψ (2P) c2 χ X(3872) X(3940) X(4160) Y(3915) Y(4260) Y(4350) Y(4660) (4430) + Z 1 + Z 2 + Z (3900) + Z (4020) + Z X(4350) Y(4140)

charmonium Strong evidence for qq̅-like states made of 4 valence quarks.

Detector effects Z(4430)

SLIDE 19

X(3872) PROMPT PRODUCTION IN pp

19

) [GeV]

π

+ π ψ m(J/ 3.6 3.7 3.8 3.9 4 Candidates / 5 MeV 20 40 60 80 100 3 10 × data total fit background signal = 7 TeV s CMS

1

L = 4.8 fb < 50 GeV T 10 < p |y| < 1.2 ) [GeV]

π

+ π ψ m(J/ 3.75 3.8 3.85 3.9 3.95 4 Candidates / 3.125 MeV 10 12 14 16 3 10 ×

) [GeV]

π

+

π ψ (J/

T

p

10 20 30 40 50

Nonprompt X(3872) fraction

0.1 0.2 0.3 0.4 0.5 |y| < 1.2 = 7 TeV s CMS

1

L = 4.8 fb

) [GeV]

π

+

π ψ (J/

T

p

10 15 20 25 30

[nb/GeV] Β ⋅

T

/dp

X(3872) prompt

σ d

2

10

1

10 1 |y| < 1.2 = 7 TeV s CMS

1

L = 4.8 fb LO NRQCD LO NRQCD uncertainty

Results (√s = 7 TeV) JHEP 04 (2013) 154 Unpolarized JPC = 1++ state assumed. Fraction of X(3872) coming from b hadrons (NP) is 0.263 ± 0.023 ± 0.016. No pT dependence of NP (or P) fraction. NRQCD predictions (assuming cc̅) for P fraction is evidently off. R = 0.0656 ± 0.0029 ± 0.0065, where

R = (pp → X(3872) + anything) · B(X(3872) → J/ ⇡+⇡−) (pp → (2S) + anything) · B( (2S) → J/ ⇡+⇡−)

sive cross section times branching frac

n 10 < pT < 50 GeV and |y| < 1.2 i

Already observed by LHCb, but measured only σinclusive (P+NP).

SLIDE 20

XYZ STATES INTERPRETATION

PDG names all non-qq̅ candidates X(mass).

Theorists/exps. use Z for charged states, Y for 1-- states, and X for the rest.

Two popular interpretations:
Meson-meson “molecule”: two white states

loosely bound by a pion exchange.

Compact tetraquark: made of a diquark-

antidiquark pair connected by color forces.

20

π

SLIDE 21 21

NEW EXOTIC STATE X(5568)

X(5568)→B0sπ±

Mass resolution:

Strong decay!

10 20 30 40 50 60 70 80 90 2 N events / 8 MeV/c

1

D0 Run II, 10.4 fb DATA Fit with background shape fixed Background Signal

(a)

5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 ] 2 [GeV/c ± π S (B ) m

ΔR < 0.3

BWðmBπÞ ∝ M2 XΓðmBπÞ ðM2 X − m2 BπÞ2 þ M2 XΓ2ðmBπÞ

6.6σ local 5.1σ global+syst

¼ 133 31. A

ger than the exper

5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 0.2 0.4 0.6 0.8 1 ] 2 ) [GeV/c ± π S (B m Efficiency ) ± π S Efficiency of M (B

Take into account mass efficiency due to ΔR cut

20 40 60 80 100 120 2 N events / 8 MeV/c

1

D0 Run II, 10.4 fb DATA Fit with background shape fixed Background Signal

(b)

5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 ] 2 [GeV/c ± π S (B ) m

No ΔR

4.8σ local 3.9σ global+syst

be 106 23, icance of 4.

Possible higher-mass states and/or , miss

(..and yes, we see at 6.27 GeV)

PRL 117, 022003 (2016)

SLIDE 22

WHAT IS IT?

X(5568) PRODUCTION RATE

22

Production rate (for comparisons to others): normalize to

Of all produced B0s, about 9% comes from X decaying to B0s π±. Really?! A strange charged beauty.

Unique: only XYZ state of four different quarks, mass determination dominated by one heavy quark

Color dominated by one heavy quark

Tetraquark?

dominated by one heavy quark

Loosely Bound Hadronic Molecule?

Color Singlets

If then could be analog of replace If then could be analog of replace

miss!

PRL 117, 022003 (2016)

SLIDE 23

TIE-BREAKER

SEARCH OF X(5568) AT CMS

Analysis strategy closer to DØ approach:
B0s → J/ψ φ: ~10x more events.
Same kinematic region (rapidity &

pT ).

Better peak(s) resolution (~3x).

23

ψ

± σ=31.6± D0 LHCb

CMS

5.6K pTBs>10GeV 112K (pTBs>5GeV) 51K (pTBs>10GeV) 44K (pTBs>10GeV)

Bs

0 yield

±

± σ σ σ σ σ

) [GeV]

+

K

−

K ψ M(J/

5.2 5.3 5.4 5.5

Candidates / 5 MeV

2000 4000 6000 8000 10000 (8 TeV)

1

19.7 fb

CMS Preliminary

ψ

± σ=31.6±

51398±283

± σ σ σ σ σ

ψ

± σ=31.6±

±

± σ σ σ σ σ

B0

s mass distributi

ψ

5582±100 σ=31.6±0.6 MeV

±

± σ σ σ σ σ

Available on the CERN CDS information server

CMS PAS BPH-16-002

2016/08/05

Search for the X(5568) state in B0

sπ± decays

The CMS Collaboration

SLIDE 24

NO X(5568)

CMS RESULTS

24

π±

No excess is seen yield in the B0

s signal region

π±) −

±Г

[GeV]

PDG

)

s

)+M(B

±

π

s

M(B ∆

5.5 5.6 5.7 5.8 5.9

Candidates / 8 MeV

200 400 600 800 1000 1200 1400 (a) (8 TeV)

1

19.7 fb

CMS Preliminary [GeV]

PDG

)

s

)+M(B

±

π

s

M(B ∆

5.5 5.6 5.7 5.8 5.9 6 − 4 − 2 − 2 4 6 (b) (8 TeV)

1

19.7 fb

CMS Preliminary

s ±

(x − x0)α × Poln(x),

(attenuated threshold) Fit to:

NX = -175 ± 134

SLIDE 25

CMS PAS BPH-16-002

PRELIMINARY CMS RESULTS

25

CMS: pT(B0s) > 10 GeV & |y| ≲ 2

95% CL,

f rX < 3.9% at

1.4)% [1].

= 10% (underestimated; real ~30-40%)

ρLHCb

X

½pTðB0

sÞ > 5 GeV < 0.011 ð0.012Þ;

ρLHCb

X

½pTðB0

sÞ > 10 GeV < 0.021 ð0.024Þ;

limits at 90 (95)% C.L. ρ = (8.6 ± 1.9 ± 1.4)%.

LHCb 2 < |y| < 4.5 DØ: pT(B0s) > 10 GeV & |y| ≲ 2 Compare to: systematics included

) 2 c Candidates / ( 4 MeV/ 50 100 150 200 250 Claimed X(5568) state Combinatorial LHCb Preliminary ] 2 c ) [MeV/ ± π s m(B 5520 5540 5560 5580 5600 5620 5640 5660 5680 5700 [GeV] PDG ) s )+M(B ± π s M(B ∆ 5.5 5.6 5.7 5.8 5.9 Candidates / 8 MeV 200 400 600 800 1000 1200 1400 (b) (8 TeV)

1

19.7 fb CMS Preliminary M(B 5.5 5.6 5.7 Candidates / 8 MeV 200 400 600 800 1000 1200 1400 (a) CMS Preliminary

εrel = 0.3 εrel = 0.1

ϵrelðXÞ

SLIDE 26

PENTAQUARKS AT LHCb

26

[GeV]

p K

m

1.4 1.6 1.8 2.0 2.2 2.4 Events/(20 MeV) 500 1000 1500 2000 2500 3000 LHCb

(a)

data phase space

(a)

by Λ → K−p in Fig. 2(a).

[MeV] 5500 5600 5700 Events / ( 4 MeV) 1000 2000 3000 4000 5000 6000 7000 LHCb p ψ / J m K

f Λ0

b → J=ψK−p

been used for the

[GeV]

p ψ / J

m

4.0 4.2 4.4 4.6 4.8 5.0 Events/(15 MeV) 200 400 600 800 LHCb

(b)

!!!

PRL 115, 072001 (2015)

SLIDE 27

BUMPS KEEP THERE!

Λ* → Kp ACTIVITY IS NOT ENOUGH

27 data total fit background (4450) c P (4380) c P (1405) Λ (1520) Λ (1600) Λ (1670) Λ (1690) Λ

(1690) Λ (1800) Λ (1810) Λ (1820) Λ (1830) Λ (1890) Λ (2100) Λ (2110) Λ

[GeV]

p ψ / J

m

4 4.2 4.4 4.6 4.8 5

Events/(15 MeV)

100 200 300 400 500 600 700 800

LHCb (b) data total fit background (1405) Λ (1520) Λ (1600) Λ (1670) Λ (1690) Λ (1800) Λ Λ

(1810) Λ (1820) Λ (1830) Λ (1890) Λ (2100) Λ (2110) Λ (2350) Λ (2385) Λ Adding 2 resonances: Pc(4450)+ → J/ψ p Pc(4380)+ → J/ψ p

f c¯

cuud, entaquark

pentaquarks?

(b)

[GeV]

p ψ / J

m

4 4.2 4.4 4.6 4.8 5

Events/(15 MeV)

100 200 300 400 500 600 700 800

LHCb

(b)

f 4449.8 1.7 2.5 MeV
MeV. A model-independent

Þþ

f 39 5 19 MeV.

sentation of the P

þ

f 4380829MeV

while the heavier state

cð

Þþ

f 205 18 86 MeV,

has a mass of .

9σ 12σ Best fit: JP(4380) = 3/2- & JP(4450) = 5/2+ Next best fit (-2 Δlnℒ ≈ 1): JP(4380) = 3/2+ & JP(4450) = 5/2-

SLIDE 28

FITTING CODE

Signal model was ported to

RooFit.

Programming optimized for

fast evaluation and negligible precision loss.

RooFit generates pseudo-

experiments.

RooFit performs 5D

integration numerically (or can use “advertised” integrals).

Fitting tests ongoing in

CPUs and CUDA Cores.

28

Fitting code

Signal model was ported

to RooFit.

Programming optimized

for fast evaluation and negligible precision loss.

RooFit generates

pseudo-experiments.

RooFit performs 5D

integration numerically (or can use “advertised” integrals).

Fitting tests ongoing.

18

Pseudo-experiments

SLIDE 29

USING ROOFIT

ANGULAR PROJECTIONS

29

Angular projections using RooFit

19

cos(θΛb) cos(θΛ*) cos(θψ) φK φμ

SLIDE 30

30

Now (~37 fb-1)!

LHC SCHEDULE

Bottom physics @ CMS, Ivan Heredia, MWPF-2015

SLIDE 31

B properties @ CMS -- Ivan Heredia

Summary

The CMS experiment has produced several competitive results

related to production, branching ratios, CPV, lifetimes, polarizations, and other properties of B hadrons.

CMS will continue studying the B0

s system to search for

anomalous CPV using decays to J/ψK+K- and J/ψπ+π- with 13 TeV data.

The Bc, B-baryon, quarkonium and exotic hadrons program will

also continue and benefit from the additional data in Run II.

The observation of B0 ⇾ μ+μ- is one of the main long term goals
f CMS. Detector upgrades will improve its sensitivity.
Similarly, b ⇾ s μ+μ- analyses are now within the core of the CMS

B physics program. Special trigger paths have been incorporated for their detailed study with 13 TeV data.

Beauty 2016 -- 5/5/16 31