[PPT] - sin(2 /2 1 ) Measurements Riccardo de Sangro INFN - Frascati FPCP PowerPoint Presentation

SLIDE 1

sin(2β/2Φ1) Measurements

Riccardo de Sangro INFN - Frascati

FPCP May 19-24, 2013

SLIDE 2

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

Outline

Introduction
Recent Experimental results on β
B→ccs
B→qqs
B→ccd
Future prospects
Summary

2

SLIDE 3

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil 3

Bd Unitary Triangle

Unitarity rela=on for Bd decays 

Experimental access to β via TD B(B) decay rate to same final CP eigenstate with eigenvalue η (assuming ΔΓ=0):

Introduction

! P

Stag ðtÞ ¼ ejtj=b

4b ½1 þ StagS sinðmdtÞ þ StagC cosðmdtÞ; C¼1jj2 1þjj2; S ¼2=mðÞ 1þjj2 ; ¼ q p

A

A; parameter Stag ¼ þ1ð1Þ

¼ þ ð a B0 ( B0),

when the tag B is tagged as CPV parameters:

f f

1) is the CP eigenvalue for a CP-even (odd)

while ¼ 1 indicates

CPV in mixing Negligible in B (~10-3) ⇒ q/p ~1 CPV in decay (direct CP)

with different w n |Af/Af| = 1)

SLIDE 4

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil 4

Discovery of CPV in the B system by BaBar and Belle(~10 years ago)
Experimentally best known angle of UT

For b→ccs “Golden Modes” Negligible penguin, theoretically clean prediction: Sη = -ηsin(2β), C=0

Penguin

Theore=cally clean as only the tree level process dominates the 

 J/$  K0  B0  B0 

Interference

Introduction

)

2

(GeV/c

ES

m

5.2 5.22 5.24 5.26 5.28

2

Events / 2 MeV/c

1000 2000

)

2

(GeV/c

ES

m

5.2 5.22 5.24 5.26 5.28

2

Events / 2 MeV/c

1000 2000

S

K ψ J/ → B

S

(2S)K ψ → B

S

K

c1

χ → B

S

K

c

η → B a)

E (MeV) Δ

20 40 60 80

Events / 2 MeV

500 1000

E (MeV) Δ

20 40 60 80

Events / 2 MeV

500 1000

L

K ψ J/ → B b)

)

2

(GeV/c

ES

m

5.2 5.22 5.24 5.26 5.28

2

Events / 2 MeV/c

100 200

)

2

(GeV/c

ES

m

5.2 5.22 5.24 5.26 5.28

2

Events / 2 MeV/c

100 200

*0

K ψ J/ → B c)

R⊥ = 0.233 ± 0.010 (stat) ± 0.005 (sys) [PRD 76, 031102(R) (2007)]

Experimentally clean as well !

SLIDE 5

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil 5

Tree “only”

LHCb B→J/ψ Ks best sin2β

measurement at hadron collider

(Phys. Lett. B 721, 2013)

Belle best measurement

from a single experiment

(PRL 108 (2012) 171802)

Introduction

b→ccs

Sccs=-ηsin2β

as only the tree lev

 J/$  K0 

SLIDE 6

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil 5

Tree “only”

LHCb B→J/ψ Ks best sin2β

measurement at hadron collider

(Phys. Lett. B 721, 2013)

Belle best measurement

from a single experiment

(PRL 108 (2012) 171802)

Introduction

b→ccs

Sccs=-ηsin2β

Penguin dominated modes

BaBar TD B0→KsKsKs

PRD 85 (2012) 054023

BaBar TD Dalitz Plot

B0→K+K-Ks

PRD 85 (2012) 112010

b s q q

S

b→qqs

Sqqs=sin2βeff

as only the tree lev

 J/$  K0 

SLIDE 7

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil 5

Tree “only”

LHCb B→J/ψ Ks best sin2β

measurement at hadron collider

(Phys. Lett. B 721, 2013)

Belle best measurement

from a single experiment

(PRL 108 (2012) 171802)

Introduction

b→ccs

Sccs=-ηsin2β

Penguin dominated modes

BaBar TD B0→KsKsKs

PRD 85 (2012) 054023

BaBar TD Dalitz Plot

B0→K+K-Ks

PRD 85 (2012) 112010

b s q q

S

b→qqs

Sqqs=sin2βeff

Small penguin pollution

Belle first observation
f CPV in B0→D*+D*-

PRD 86 (2012) 071103(R)

BaBar B0→D*+D*-

partial reconstruction

PRD 86 (2012) 112006

b→ccd

Sccd=sin2βeff

as only the tree lev

 J/$  K0 

SLIDE 8

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil 5

Tree “only”

LHCb B→J/ψ Ks best sin2β

measurement at hadron collider

(Phys. Lett. B 721, 2013)

Belle best measurement

from a single experiment

(PRL 108 (2012) 171802)

Introduction

b→ccs

Sccs=-ηsin2β

Penguin dominated modes

BaBar TD B0→KsKsKs

PRD 85 (2012) 054023

BaBar TD Dalitz Plot

B0→K+K-Ks

PRD 85 (2012) 112010

b s q q

S

b→qqs

Sqqs=sin2βeff

Small penguin pollution

Belle first observation
f CPV in B0→D*+D*-

PRD 86 (2012) 071103(R)

BaBar B0→D*+D*-

partial reconstruction

PRD 86 (2012) 112006

b→ccd

Sccd=sin2βeff

as only the tree lev

 J/$  K0 

Measure S,C in these processes to test SM prediction and look for new physics (NP)

C,S ~same in SM

SLIDE 9

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil 6

6

(~ 385 10 of each , , , ) B B B B

Belle,

(4S) e e BB

6

(~ 235 10 of each , , , ) B B B B

mostly BABAR, B

Cast of characters

and

pp bbX

9

( 20 10 of each , , , ) B B B B

and recently LHCb

...more coming

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil 7

Tagging & Time measurement

Production of coherent

BB pair from Y(4S) decay with (slight) boost to allow Δt measurement.

Clean kinematic

constraints

~100% efficiency for BB

events

Signal Selection CPV Asymmetry Fit

B-Factories

SLIDE 11

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil 8

LHCb

Opposite Side Same Side

b b̅ d d̅ u

Bd

KS J/ψ μ μ π π

Signal

π+

SS Pion

b ➝ c ➝ s b ➝ X l-

VTX OS Muon OS Electron

l- K-

OS Kaon

Tagging algorithms
OS tagging exploits decay of

associated b hadron

lepton taggers
kaon tagger
inclusive secondary vertex

reconstruction

SS tagging uses remnants
f the signal b

hadronization

SS Kaon for Bs mesons
SS Pion for B0 and B+

mesons

Julian Wishahi | Δ

LHCb Decay time [ps]

0.2
0.1

0.1 0.2

Candidates / (5 fs)

1000 2000 3000 4000 5000 6000 7000

LHCb

inary* Preliminary*

~45 fs time resolution (from prompt J/ψ) 1(+2) fb-1 integrated luminosity

εtagD2 ≈ 2.3% ω ≈ 36.7%

Tagger εtag % ω % εtagD2 % µ 5.20±0.04 30.8±0.4 0.77±0.04 e 2.46±0.03 30.9±0.6 0.36±0.03 K 17.67±0.08 39.33±0.24 0.81±0.04 Qvtx 18.46±0.08 40.31±0.24 0.70±0.04

~30% at B-Factories OS tagger performance

incoherent production σ(bb)≈75 µb at √s=7 TeV 2 < η < 6

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

CPV in b→ccs

SLIDE 13

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

LHCb Sin2β

10

1.0 fb-1 of data (2011, 3.5 TeV)
~8200 tagged B0→J/ψKs decays,

with J/ψ→µ+µ- and Ks→π+π-

Used opposite flavor tag only
1.5% correction for b-b production

asymmetry in pp collisions

Magnet polarity reversed periodically

to cancel detector asymmetries

Good agreement with B-Factories results, error ~ x3 that of B factories

➡ Best measurement at hadron colliders!

[Phys. Lett. B 721, 2013]

SJ/ψ K0

S = 0.73 ± 0.07 (stat) ± 0.04 (syst),

CJ/ψ K0

S = 0.030 ± 0.089

0.091 (stat) ± 0.012 (syst),

f ρ(SJ/ψ K0

S, CJ/ψ K0 S) = 0.416.

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

Belle Sin2β

772 106 BB pairs

11

Events / 0.5 ps 50 100 150 200 250 300 350 400 t (ps) ∆

6 -4 -2

2 4 6 Asymmetry

0.6
0.4
0.2

0.2 0.4 0.6 Events / 0.5 ps 50 100 150 200 250 t (ps) ∆

6 -4 -2

2 4 6 Asymmetry

0.6
0.4
0.2

0.2 0.4 0.6

1k 2k 3k 5.2 5.22 5.24 5.26 5.28 5.3

All combined B0→J/ψKS B0→ψ(2S)KS B0→χc1KS Fit result

(a)

Mbc (GeV/c2) Events / 1 MeV/c2

Data B0→J/ψKL real J/ψ, real KL real J/ψ, fake KL fake J/ψ

(b)

pB* (GeV/c) Events / 50 MeV/c

1k 2k 3k 4k 5k 0.4 0.8 1.2 1.6 2

TABLE I. CP eigenvalue (f), signal yield (Nsig), and purity for each B0 ! fCP mode. Decay mode f Nsig Purity (%) J=c K0

S

1 12 649 114 97 c ð2SÞð‘þ‘ÞK0

S

1 904 31 92 c ð2SÞðJ=c þÞK0

S

1 1067 33 90 c1K0

S

1 940 33 86 J=c K0

L

þ1 10 040 154 63

þ0:642 0:047 0:021 þ0:667 0:023 0:012 þ sin21 fSf

= =

Af þ

0:041

012 þ0:006 0:016 0:012

Best measurement from a single experiment!

[PRL 108, 171802 (2012)]

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil 12

b→ccs World Average

3% precision δ(β) ≈ ±0.6°

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

CPV in b→qqs

SLIDE 17

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

Sin2β from b→qqs

14

b s q q

in the values of S and C. Definitions:

g s b b s ~ ~ ~

( )LR

d 23

δ

Decay amplitude dominated by penguin loops: “b→s

penguins”

Measure or constrain penguin amplitudes
Standard Model predicts that the dominant weak

phase is the same as that of b→ccs: S=-ηsin2β, C=0

New Physics could change S,C from SM prediction

ΔS = Sccs - Sqqs sin2β eff = -ηCP Sqqs

n

s

n
n

SM

ΔS

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

BaBar B0→KsKsKs

15

Theoretically clean
Low background
Final state is CP=+1 eigenstate
Can perform phase space integrated TD

analysis

Maximum likelihood fit using mES, ΔE, NN and Δt

KS is long lived ⇔ no tracks emerge from the B decay vertex

0:94þ0:24

0:21 0:06

the first quoted uncertainty

be S ¼

and C ¼ 0:17 0:18 0:04,

[PRD 85, 054023 (2012)]

S

1.5
1
0.5

C

0.5

0.5 1 2 3 4 5

First evidence of CPV (3.8σ)! b→ccs

16 15 13 12

201 62 ± ±

Signal yields: B0→3K0

S(π+π-) (Purity = 40%)

B0→2K0

S(π+π-) K0 S(π0π0)

CL contours SCP (=-ηS)

Most recent Belle PRL 98 (2007) 031802

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

BaBar B0→K+K-Ks

Final state not pure CP

eigenstate

With Dalitz plot (DP) analysis can

separate intermediate (resonant) CP eigenstates

DP analysis can resolve

trigonometric ambiguity on β from sin2β measurement

TD analysis gives access to βeff
Can extract sin2βeff for ΦKS

which has small theoretical uncertainty

16

its

plitudes: m2

13

m2

23

spin=0 spin=1 spin=2

3 13 23

d p dm dm E ∝

“Cartoon” DP

Superimposed resonant contributions

P→p1p2p3

! Interference ! access to phases

with no ambiguity such as sin2β eff = sin(180° - 2β eff)

[PRD 85, 112010 (2012)]

See also most recent Belle: PRD 82 (2010) 073011

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May 19-24, 2013 FPCP 2013 - Buzios, Brasil

BaBar B0→K+K-Ks

17

[PRD 85, 112010 (2012)]

A ~ Σ ci F(m2

13,m2 23)

A ~ Σ ci F(m2

13,m2 23)

F=functions describing amplitue (e.g. Breit-Wigner) ci=complex, “isobar amplitudes”

TD Amplitude

C, S, phases, BR etc. are derived from the ci extracted

from the DP fits to data

Intermediate amplitudes determined with the help of

higher statistics data samples of charged B decays to three kaons

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May 19-24, 2013 FPCP 2013 - Buzios, Brasil

BaBar B0→K+K-Ks

18

Nsig = 1579±46 (Purity = 18%) BF = (25.4±0.9±0.8)×10-6 [χc0K excluded] βeff(ϕKS) = (21±6±2)° ← most precise βeff(f0KS) = (18±6±4)° βeff(non-ϕ, non-f0) = (20.3±4.3±1.2)° 90°-βeff excluded at 4.8σ (ambiguity in J/ψKS) Agree with SM

Component ð1020ÞK0

S

f0ð980ÞK0

S

Other ACPð¼ CÞ ð%Þ S 5 18 5 0:66 0:17 0:07 28 24 9 0:55 0:18 0:12 2 9 3 0:65 0:12 0:03

) tly degenerate in β) Agree

[PRD 85, 112010 (2012)]

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May 19-24, 2013 FPCP 2013 - Buzios, Brasil

b→qqs

19

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

CPV in b→ccd

SLIDE 24

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

The VV final state is a superposition of CP+ and CP- states depending on

the angular momentum of the decay products

Need angular analysis to distinguish the two components
This has been done by BaBar (and Belle) with fully reconstructed events,

measuring the CP-odd fraction R⊥ and the time dependent CP asymmetry

Full TD amplitude CP=+1 for A||,A0 CP=-1 for A⊥

21

“Transversity basis”

B0→D+D-

SLIDE 25

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

Entries / ps

0.8 0.6 0.4 0.2

0.2
0.4
0.6
0.8
1
5

5 20 40 60 80 100

raw asymmetry t (ps)

Belle CPV in B0→D+D-

22

[PRD 86 (2012) 071103(R)]

Full data set 771x106 BB pairs
Fully reconstructed decay chain

BðB0!DþDÞ ¼ ½7:82 0:38ðstatÞ 0:63ðsystÞ 104; R0 ¼ 0:624 0:029ðstatÞ 0:011ðsystÞ; R? ¼ 0:138 0:024ðstatÞ 0:006ðsystÞ; S ¼ 0:79 0:13ðstatÞ 0:03ðsystÞ; and A ¼ 0:15 0:08ðstatÞ 0:04ðsystÞ:

1st Observation >5σ !

(GeV)

bc

M

5.24 5.26 5.28 5.30

Events / ( 0.00175 GeV )

50 100 150 200 250 300

a) E (GeV) ∆

0.1

0.0 0.1

Events / ( 0.007 GeV )

50 100 150 200 250

b)

Also results on D(*)D final states: [PRD 85, 091106(R)]

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

BaBar Partial Reconstruction

BaBar and Belle full reconstruction analyses measured the CP even

component CPV parameters S+ and C+, and the fraction R⊥ of CP-odd amplitude:

In a partial reconstruction analysis, we measure average S and C parameters

which are related to C+ and S+ by the relations C=C+ and S=S+(1-2R⊥)

Analysis Method Partial Reconstruction

Partial Reconstruction Method

Fully reconstruct one D* decaying to D0π,

with the D0 decaying to one of 4 modes

Match reconstructed D* with a slow pion of
pposite sign in the event
Select candidate if the kinematics is

consistent with a B0 decaying to a D*-D0π combination with a missing D0

Compute recoiling D0 mass mrec

R⊥=0.158±0.028±0.006

Disadvantages:
Higher background
Larger systematic errors
Advantages:
Gain is statistics
Almost independent sample

B0 “tag” Y(4S) B0 “CP”

un-reconstructed D*, use only slow pion

π∓s

D0 D±* D0

Kπ Kππ0 K3π Ksπ+π- π±

Fully reconstructed D*

23

[PRD 86 (2012) 112006]

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

BaBar Partial Reconstruction

Kaon Tags

24

[PRD 86 (2012) 112006]

recoil mass (GeV/c^2)

1.84 1.845 1.85 1.855 1.86 1.865 1.87

Events / ( 0.001 GeV/c^2 )

200 400 600 800 1000 1200 1400 1600 1800 2000

mRec - On Peak

fisher 15

1 -0.5

0.5 1 1.5 2 2.5 3 3.5 4

Events / ( 0.04 )

200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400

Fisher15 - on Peak

recoil mass (GeV/c^2)

1.84 1.845 1.85 1.855 1.86 1.865 1.87

Events / ( 0.001 GeV/c^2 )

10 20 30 40 50

mRec - Off Peak

fisher 15

1 -0.5

0.5 1 1.5 2 2.5 3 3.5 4

Events / ( 0.0625 )

10 20 30 40 50 60 70

Fisher15 - off Peak

BB qq Signal Sum

Kin Fit Result - DATA

mrec F mrec F

delta t (ps)

8
6
4
2

2 4 6 8

Events / ( 1 ps )

200 400 600 800 1000 1200 1400 1600 1800 2000 2200

delta t (ps)

8
6
4
2

2 4 6 8

Events / ( 1 ps )

200 400 600 800 1000 1200 1400 1600 1800 2000 2200

Dt

8
6
4
2

2 4 6 8

Asymmetry

0.25
0.2
0.15
0.1
0.05

0.05 0.1 0.15 0.2 0.25

Dt

8
6
4
2

2 4 6 8

Asymmetry

0.25
0.2
0.15
0.1
0.05

0.05 0.1 0.15 0.2 0.25

B0 B0

Δt Fit Result and Raw Asymmetry

Δt (ps) Δt (ps)

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R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

BaBar Partial Reconstruction

Combined kaon and lepton tags

Results Extraction of S+,C+

from R⊥

All errors are statistical + systematic

BABAR preliminary

C = C+ S = S+ (1 − 2R⊥) , R⊥ = 0.158 ± 0.02 Assuming negligible penguin contributions, then S+=-S-, and: and using[1]: This result is compatible with previous BaBar[1] and Belle[2] measurements and in agreement with SM predictions

[1] B. Aubert et al. (BABAR collaboration), Phys. Rev. D79, 032002 (2009) ; [2] B. Vervink et al. (Belle collaboration), Phys. Rev. D80, 111104 (2009).; Belle Collab. EPS 2011 Preliminary

25

[PRD 86 (2012) 112006]

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May 19-24, 2013 FPCP 2013 - Buzios, Brasil

b→ccd

26

SLIDE 30

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

Outlook

27

LHCb and Belle 2 at the KEK super B factory will improve the precision of sin2β

from ccs to by ~x10

Mode Current Precision Predicted Precision (75 ab1) Discovery Potential

Stat. Syst.

∆Sf(Th.)

Stat. Syst.

∆Sf(Th.) 3 5 J/ K0

S

0.022 0.010 0 ± 0.01 0.002 0.005 0 ± 0.001 0.02 0.03 ⌘0K0

S

0.08 0.02 0.015 ± 0.015 0.006 0.005 0.015 ± 0.015 0.05 0.08 K0

S⇡0

0.28 0.01

0.020 0.010
f0K0

S

0.18 0.04 0 ± 0.02 0.012 0.003 0 ± 0.02 0.07 0.12 K0

SK0 SK0 S

0.19 0.03 0.02 ± 0.01 0.015 0.020 0.02 ± 0.01 0.08 0.14 K0

S

0.26 0.03 0.03 ± 0.02 0.020 0.005 0.03 ± 0.02 0.09 0.14 ⇡0K0

S

0.20 0.03 0.09 ± 0.07 0.015 0.015 0.09 ± 0.07 0.21 0.34 !K0

S

0.28 0.02 0.1 ± 0.1 0.020 0.005 0.1 ± 0.1 0.31 0.51 K+KK0

S 0.08

0.03 0.05 ± 0.05 0.006 0.005 0.05 ± 0.05 0.15 0.26 ⇡0⇡0K0

S

0.71 0.08

0.038 0.045
⇢K0

S

0.28 0.07 0.13 ± 0.16 0.020 0.017 0.13 ± 0.16 0.41 0.69 J/ ⇡0 0.21 0.04

0.016 0.005
D⇤+D⇤

0.16 0.03

0.012 0.017
D+D

0.36 0.05

0.027 0.008
(*)

(*) 2011

SuperB Factory - B. Meadows, et al. [arXiv:1109.5028v2, Oct 2011]

Table from SuperB study

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R. de Sangro (LNF-INFN)

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Outlook

27

LHCb and Belle 2 at the KEK super B factory will improve the precision of sin2β

from ccs to by ~x10

Mode Current Precision Predicted Precision (75 ab1) Discovery Potential

Stat. Syst.

∆Sf(Th.)

Stat. Syst.

∆Sf(Th.) 3 5 J/ K0

S

0.022 0.010 0 ± 0.01 0.002 0.005 0 ± 0.001 0.02 0.03 ⌘0K0

S

0.08 0.02 0.015 ± 0.015 0.006 0.005 0.015 ± 0.015 0.05 0.08 K0

S⇡0

0.28 0.01

0.020 0.010
f0K0

S

0.18 0.04 0 ± 0.02 0.012 0.003 0 ± 0.02 0.07 0.12 K0

SK0 SK0 S

0.19 0.03 0.02 ± 0.01 0.015 0.020 0.02 ± 0.01 0.08 0.14 K0

S

0.26 0.03 0.03 ± 0.02 0.020 0.005 0.03 ± 0.02 0.09 0.14 ⇡0K0

S

0.20 0.03 0.09 ± 0.07 0.015 0.015 0.09 ± 0.07 0.21 0.34 !K0

S

0.28 0.02 0.1 ± 0.1 0.020 0.005 0.1 ± 0.1 0.31 0.51 K+KK0

S 0.08

0.03 0.05 ± 0.05 0.006 0.005 0.05 ± 0.05 0.15 0.26 ⇡0⇡0K0

S

0.71 0.08

0.038 0.045
⇢K0

S

0.28 0.07 0.13 ± 0.16 0.020 0.017 0.13 ± 0.16 0.41 0.69 J/ ⇡0 0.21 0.04

0.016 0.005
D⇤+D⇤

0.16 0.03

0.012 0.017
D+D

0.36 0.05

0.027 0.008
(*)

(*) 2011

SuperB Factory - B. Meadows, et al. [arXiv:1109.5028v2, Oct 2011]

Improved penguin dominated modes measurements will lead to the

improvement of the experimental precision on ΔS by ~x10 on several b→qqs channels, to match (present) theory accuracy

Table from SuperB study

SLIDE 32

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

Outlook

27

LHCb and Belle 2 at the KEK super B factory will improve the precision of sin2β

from ccs to by ~x10

Mode Current Precision Predicted Precision (75 ab1) Discovery Potential

Stat. Syst.

∆Sf(Th.)

Stat. Syst.

∆Sf(Th.) 3 5 J/ K0

S

0.022 0.010 0 ± 0.01 0.002 0.005 0 ± 0.001 0.02 0.03 ⌘0K0

S

0.08 0.02 0.015 ± 0.015 0.006 0.005 0.015 ± 0.015 0.05 0.08 K0

S⇡0

0.28 0.01

0.020 0.010
f0K0

S

0.18 0.04 0 ± 0.02 0.012 0.003 0 ± 0.02 0.07 0.12 K0

SK0 SK0 S

0.19 0.03 0.02 ± 0.01 0.015 0.020 0.02 ± 0.01 0.08 0.14 K0

S

0.26 0.03 0.03 ± 0.02 0.020 0.005 0.03 ± 0.02 0.09 0.14 ⇡0K0

S

0.20 0.03 0.09 ± 0.07 0.015 0.015 0.09 ± 0.07 0.21 0.34 !K0

S

0.28 0.02 0.1 ± 0.1 0.020 0.005 0.1 ± 0.1 0.31 0.51 K+KK0

S 0.08

0.03 0.05 ± 0.05 0.006 0.005 0.05 ± 0.05 0.15 0.26 ⇡0⇡0K0

S

0.71 0.08

0.038 0.045
⇢K0

S

0.28 0.07 0.13 ± 0.16 0.020 0.017 0.13 ± 0.16 0.41 0.69 J/ ⇡0 0.21 0.04

0.016 0.005
D⇤+D⇤

0.16 0.03

0.012 0.017
D+D

0.36 0.05

0.027 0.008
(*)

(*) 2011

SuperB Factory - B. Meadows, et al. [arXiv:1109.5028v2, Oct 2011]

Improved penguin dominated modes measurements will lead to the

improvement of the experimental precision on ΔS by ~x10 on several b→qqs channels, to match (present) theory accuracy

Table from SuperB study

Improved experimental precision on penguin dominated modes in Bd and Bs

and charged Bd,s decays will lead to theory improvement as well

SLIDE 33

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

Outlook

28

Super KEK, Belle2

[arXiv:1109.5028v2] Jul 2011

Observable/mode Current LHCb SuperB Belle II LHCb upgrade theory now (2017) (2021) (2021) (10 years of running) now 5 fb1 75 ab1 50 ab1 50 fb1 α from uud 6.1 5a 1 1

b

1 − 2 β from ccs (S) 0.8 (0.020) 0.5 (0.008) 0.1 (0.002) 0.3 (0.007) 0.2 (0.003) clean S from Bd → J/ψπ0 0.21 0.014 0.021 (est.) clean S from Bs → J/ψK0

S

? ? clean

Mode

5 ab−1 50 ab−1 ∆S ∆A ∆S ∆A φK0 0.073 0.049 0.029 0.018 η′K0 0.038 0.026 0.020 0.012 K0

SK0 SK0 S

0.105 0.067 0.037 0.024

LHCb

Table 4: Current and projected precisions of the key observables in b → sqq decays.

Observable Current LHCb upgrade (50 fb−1) Theory uncertainty AU, V (B0

s → φφ)

0.04 (LHCb 1.0 fb−1) 0.004 0.02 [301] φeff

s (B0 s → φφ)

– 0.03 0.02 [298] φeff

s (B0 s → K∗0 ¯

K∗0) – 0.03 0.02 [298] sin 2βeff(B0 → φK0

S)

0.12 (B factories) 0.06 0.02 [178]

[arXiv 1208.3355v3] May 2013

Complementarity between LHCb and Belle2

[arXiv 1200.5012v1] Feb 2010

SLIDE 34

R. de Sangro (LNF-INFN)

May 19-24, 2013 FPCP 2013 - Buzios, Brasil

Summary

β best measured angle of UT dominated by B

factories final results on full data set

LHCb should reach ~same precision as B factories

in present (pre-upgrade) run

No new physics found from comparison with ccd or

qqs C,S measurements at present level of precision

Progress expected from LHCb study of qqs penguin

in both Bd and Bs modes in near future

KEK Super B factory will lead to ~1 order magnitude

improvement in the experimental errors on sin2β from all processes to match theory errors on ΔS

29

sin(2β/2Φ1) Measurements

Outline

Introduction

Introduction

Introduction

Introduction

Introduction

Introduction

Cast of characters

B-Factories

LHCb

CPV in b→ccs

LHCb Sin2β

➡ Best measurement at hadron colliders!

Belle Sin2β

= =

b→ccs World Average

3% precision δ(β) ≈ ±0.6°

CPV in b→qqs

Sin2β from b→qqs

ΔS = Sccs - Sqqs sin2β eff = -ηCP Sqqs

BaBar B0→KsKsKs

BaBar B0→K+K-Ks

BaBar B0→K+K-Ks

from the DP fits to data

higher statistics data samples of charged B decays to three kaons

BaBar B0→K+K-Ks

b→qqs

CPV in b→ccd

B0→D*+D*-

Belle CPV in B0→D*+D*-

BaBar Partial Reconstruction

BaBar Partial Reconstruction

BaBar Partial Reconstruction

Combined kaon and lepton tags

b→ccd

Outlook

Table from SuperB study

Outlook

Table from SuperB study

Outlook

Table from SuperB study

Outlook

Summary

factories final results on full data set

in present (pre-upgrade) run

qqs C,S measurements at present level of precision

in both Bd and Bs modes in near future

improvement in the experimental errors on sin2β from all processes to match theory errors on ΔS

B0→D+D-

Belle CPV in B0→D+D-