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LHCb results

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LHCb Collaboration: 755 M embers, from 55 Institutes in 15 Countries. LHCb results. Evgeny Gushchin (INR RAS) for the LHCb collaboration. Outline. Introduction LHC as B-factory LHCb is B-meson experiment for search NP in CPV and rare decays Experimental technique and key performances - PowerPoint PPT Presentation
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LHCb results Evgeny Gushchin (INR RAS) for the LHCb collaboration LHCb Collaboration: 755 Members, from 55 Institutes in 15 Countries
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Page 1: LHCb results

LHCb results

Evgeny Gushchin

(INR RAS)

for the LHCb collaboration

LHCb Collaboration:755 Members, from 55 Institutes in 15 Countries

Page 2: LHCb results

XV Lomonosov conference, Moscow

Outline

• Introduction– LHC as B-factory

• LHCb is B-meson experiment for search NP in CPV and rare decays– Experimental technique and key performances

• Physics program and selected Results• Conclusion

Page 3: LHCb results

XV Lomonosov conference, Moscow

Search for New Physics beyond SM at LHC

Search for new particles with observable masses produced directly in pp collisions

As virtual contribution of new heavy particles i.e. to loop and box diagrams in FCNC : i.e. it can change values, phases and/or Lorentz structure of couplings.

i.e. Higgs, SupersymmetryAND/OR

measurable as deviation from SM precise prediction for heavy quark processes, i.e. for B,D mesons:

• in rare decays • in CP violation phase (mixing and decay)

Very good statistics:Very large bb-production

Very good detector:– Selective/efficient trigger– PID– Excellent mass and time

resolution

LHCb @ LHC!!!

Page 4: LHCb results

XV Lomonosov conference, Moscow

LHC as B - factory

• Very high luminosity – 2.4*1033(nominal-1034)cm-2sec-1

• High production cross-section (@3.5TeV):– ~300µb ( pp bb X) and ~6.1mb ( pp cc X)

– But also ~65 mb for minimum-bias

• Annual yield (in LHCb) – > 1011BB-pair and 20xDD.

To reduce L0 rate > 10 MHz to 2-3 kHz VERY selective trigger is necessary!Trigger on low pT tracks with efficient PID

Tevatron: instant luminosity reached ~4*1032/cm2/s and total L~11/fb. Cross-sections bb is 3 times lower than at LHC.

B-pairs are produced mainly in forward and backward directions:

Single-arm spectrometer covering ~4% of open angle has ~40% acceptance.

All b-species: B+ : B0 : B0

s : Λ0b : Bc

40%:40%:10%:10%:0.1%

In LHCb:~1 of 200 collisions with b-quark !~1 of 10 - with c-quark !

Page 5: LHCb results

XV Lomonosov conference, Moscow

LHCb detectorLHCb is forward spectrometer optimized for studies of CPV and B-meson rare decays

LHCb key performances:Vertex/proper time resolution : VELOPID: RICH, Calorimeter, Muon systemMass resolution: Tracker

~4Tm

p-p interaction point

Page 6: LHCb results

XV Lomonosov conference, Moscow

LHCb detector and trigger efficiency

Detector subsystems are ~99% efficient!

Trigger has very high selection efficiency!

Muon trigger (J/) eff ~ 95%Hadron trigger (D0) eff ~ 60%

PT PT PT

L0e,

L0had

L0

High pT trackNon-zero impact parameter

HARDWARE

SOFTWARE

Inclusive selections:, , +track,

charm, ..+ Exclusive selections

Global reconstruction

Storage3 kHz

30 kHz

40 MHz

<1 MHz

Lev

el-0

HL

T1

HL

T2

Average event size ~35 kB

Page 7: LHCb results

XV Lomonosov conference, Moscow

Vertex / Time resolutionLHCb lifetime measurements using 36 pb-1 of 2010 data – world class!

1.638 ± 0.0111.525 ± 0.0091.525 ± 0.0091.477 ± 0.0461.391 ± 0.038

PDG [ps]LHCb-CONF-2011-001 [ps]

Vertex Locator (VELO)provides excellent proper time resolution of ~50 fs

Both statistical and systematical errors are expected to be significantly improved with 2011 data!

Page 8: LHCb results

XV Lomonosov conference, Moscow

Mass resolutionMass resolution is based on precise momentum measurement with LHCb magnet and

tracker: Δp/p<0.5% up to 100 GeV/c

LHCb-CONF-2011-027: masses [MeV/c2]5279.17 ±

0.295279.50 ± 0.305279.50 ± 0.305366.30 ± 0.605620.2 ± 1.66277 ± 6

PDG [MeV/c2]

Bu+ J/ψ K+ Bs

0 J/ψ φ

2010 L=35 pb-1

World-best mass measurements!

With 2010 data!

2010 L=35 pb-1

11151±115 events

=10.50±0.10 MeV/c2

816±30 events

= 6.96±0.25 MeV/c2

Page 9: LHCb results

XV Lomonosov conference, Moscow

Particle Identification

Hadron PID – RICH1 and RICH2

Muon PID – Muon systemphoton/electron/hadron PID –

SPD/PRS/ECAL/HCAL

0 (no conversions)

X

RICH PID absolutely necessary to identify charged hadrons in B hh

E = 7.2 MeV/c2

Page 10: LHCb results

XV Lomonosov conference, Moscow

LHCb operationLHCb collected ~37 pb-1 in 2010 and already ~ 700 pb-1 recorded in 2011By end of 2011 LHCb hopes to collect 1 fb-1

nominal µ =0.4

•LHC reached nominal peak luminosity of 2.4*1033 cm-2s-1 with number of bunches is ~1300 from ~2600.•LHCb recording >1pb-1/hour running at L~3.5*1032 cm-2sec-1 in auto-leveling mode•GPD luminosity is 4 times higher than LHCb

•Visual average number of vertexes per BX now is ~3 times larger than nominal µ =0.4 (in 2010 ~6

larger)•1 PV gives ~30 tracks/rapidity unit •Higher µ means higher track multiplicity, that is dangerous for reconstruction

LHCb luminosity auto-leveling

LHC performs well!

~30 pb-1 for LHCb in 29 h in single fill !dL/dt ~ 100 pb-1/week !

2010

nominal µ =0.4

2011

Page 11: LHCb results

XV Lomonosov conference, Moscow

LHCb physics program and key measurements

LHCb is optimized for study of CP-violation and rare decays in B-mesons.

LHCb physics program includes measurements:• CP-violation in B+,B0,Bs

– Prospects for -angle measurement• Tree-level processes (B DX),• Loop processes (charmless B decays)

– Direct CP-violation (B K)– Mixing induced CPV ( s )

• Rare decays &NP– Bd → K*µµ– Bs → µµ – …

• Quarkonia studies• Physics with charm • Soft QCD• Electroweak physics (W,Z)

More studies are presented today in LHCb talks by Vladislav Balagura, Pavel Krokovny and Dasha Savrina

Highlights in this talk

Page 12: LHCb results

XV Lomonosov conference, Moscow

CKM – matrix is measured very precisely. Great jobs done by B-factories and others.Less constrained -angle :

combinated “trees” & “loops”: = (67±4)°from “trees” only: = (73+22

-25)°

Prospects for -measurements with “trees”:(based on Gronau-London-Wyler & Atwood-Dunietz-Soni methods+ time-dependent + Dalitz-plot analysis )

• To combine Bs Ds± K±, B0 DK*0 and B±DK±

()~5° with 2 fb-1

Bs Ds-K+ (Ds

+K-) decays • under study, time-dependent analysis (Acp - M)• M – Bs mixing phase well constrained in Bs→Ј/ψФ

- at first step ∆ms measurement using Bs Ds

B±DK± decays using common mode for D0&D0 K+-

Mode more suppressed for D0 and favored for D0

maximizes interference: D0 K+- (DCS) and D0 K+- (CF)

But total branching very small (~10-7)

Preliminary: evidence for suppressed ADS mode at 4.0 with 343 pb-1.Ratio to favored mode:

-angle measurements

“trees”

World average (without LHCb):1.6 ± 0.3

-0.58 ± 0.21

PL

B27

0,75

(199

1);

PR

L78

,325

7(19

97)

World-class measurement!

Page 13: LHCb results

XV Lomonosov conference, Moscow

Measurement of ∆ms

• ∆ms – mixing frequency in Bs

• Used ~1381 B0s decays from 2010 data:

• Combining the 4 decays allows suppress decay-specific features

• To be used in time-dependent CPV studies

Likelihood scan for ∆ms

LHCb-CONF-2011-005, CERN-PAPER-2011-010

World-class measurement!

World average: ∆ms = 17.77 ± 0.10 ± 0.07 ps-1

Page 14: LHCb results

XV Lomonosov conference, Moscow

Direct CP asymmetry measurement in B0d,s→K

LHCb with L=320pb-1 of 2011 data already has done:B0→K - the most precise single measurement and first 5σ observation at

hadron machine! B0

s→K - the first evidence of CP-violation in Bs decay!

LHCb-CONF-2011-042Acp(B

0→Kπ) = -0.088±0.011(stat) ±0.008(syst)

To be compared with world average: -0.098+0.012-0.011

Acp(Bs→Kπ) = 0.27±0.08(stat) ±0.02(syst)

First LHCb result (with 37pb-1 data of 2010)

LHCb-CONF-2011-011

Acp(B0→K+π0.074±0.033- =(־(stat) ±0.008(syst)

Acp(B0

s→K־ π+)= -0.15±0.19(stat) ±0.02(syst)

HFAG:

Acp(B0→K+π־)= - 0.098+0.012

-0.011

CDF:

Acp(B0

s→K־ π+)= 0.39±0.15(stat) ±0.08(syst)

Raw asymmetry (has to be corrected for

detector and production asymmetry)

Page 15: LHCb results

XV Lomonosov conference, Moscow

LHCb result on fs/fd

Very important for absolute branchingmeasurements like Bs

The ratio of fragmentation fractions fs/fd is measured by LHCb:

• In hadronic decays, via relative abundance of B0

s→D־s+ to B0→D־K+ and B0→D־+

LHCb-PAPER-2011-006, submit. To PRL

• In semileptonic decays

LHCb-CONF-2011-028

• And combined result

LHCb-CONF-2011-034

Page 16: LHCb results

XV Lomonosov conference, Moscow

Quarkonium studies

LHCb quarkonium physics program is rich and promising:• Heavy quarkonium states

– give impact to theory (NRQCD..)

– exotic states: molecular type state, tetraquark (?)

• + Related production studies – test QCD models in forward region

• Highlights : X(3872), X(4140), χc , χb

• New exciting results are expected in future: (2S) and (3S) production

– J/ polarization (pT,y)

– X(3872) quantum numbers and precise mass

– Z±(4430) confirmation and Zb existence

– New states?

See also Vladislav’s talk today

Page 17: LHCb results

XV Lomonosov conference, Moscow

Production studies at LHCbMany new results for flavour production were obtained with 2010 data:

• pp b b X• pp J/ X• pp F X W,Z • (1S)

Bc+

• c

• pp J/ J/ X

Test QCD model

(tetraquark?)

LHCb-CONF-2011-012

LHCb-CONF-2011-016

LHCb-CONF-2011-017

LHCb-CONF-2011-020

LHCb-PAPER-2011-013

Test QCD model in Forward region

LHCb-PAPER-2011-007

first observation in p-p collisions

Page 18: LHCb results

XV Lomonosov conference, Moscow

X(3872) J/ +-

Unknown quantum numbers.Not excluded conventional charmonium state c2(1D), but predicted mass is far bellow.

Can be exotic state: molecular 1++ (D*D0 most popular) or tetraquark.

X(3872) production cross-section (LHCb-CONF-2011-043)

Mass measurement X(3872) (LHCb-CONF-2011-021)

MX(3872) = 3871.96 ± 0.46(stat) ± 0.10 (syst) MeV/c2

To test molecular state mass precision has to be <0.1 MeV/c2 – in prompt.Quantum numbers have to be identified in B-decays.

2010 data

Search for X(4140)

CDF observed a 5σ peak in the B+→J/ψ φ K+ channel.

Candidate for exotic bounds state

Preliminary (LHCb-CONF-2011-045)

LHCb with 376 pb-1:

364 ± 20 of B+→J/ψ φ K+ sample after φ –mass cut.

~3.2 times more than CDF with 6fb-1.

Fit (LHCb): 7 ± 5 events

Scaled from CDF data :

39 ± 9 ± 6 events

CDF arXiv:1101.6058

LHCb does not confirm presence of X(4140)

Page 19: LHCb results

XV Lomonosov conference, Moscow

Production of χcJ/ • P-wave charmonium state

• ECAL only detection of photons:

with/without conversion

• States separation is done by fit of

mass-spectrum with both states χc1 χc2

• 209k χc with 35.6 pb-1 (2010)

LHCb-CONF-2011-020 Test NRQCD: colour singlet + colour octetDiscrepancy at low pT

Observation of b (1S) • In order to interpret measurements of the production and

polarization the feeddown from higher bottomonium states has

to be understood.

• According to Pythia MC, ~ 40% of (1S) come from b.

• A clear signal for b production is seen.

• The photon is reconstructed only with the calorimeter info.• Can not do a separation of the states yet.

Page 20: LHCb results

XV Lomonosov conference, Moscow

Expecting world best measurements s , Δms soon!

CP-violation phase in Bs-mixing: Bs→Ј/ψФ

Year 2010:Nsig=836 ± 60

LHCb-CONF-2011-006: data from 2010 L=36 pb-1

“Toy” Monte-Carlo using 2010 data as distribution function, but for 10xlarger statistics

Results for 2011 data with much larger statistics are coming very soon

-> expecting world best

measurement of s!

Year 2011:

Standard Model value, probability = 22%(1.2σ)

• Dominant contribution – tree-level diagram• Contribution from “penguin” is small (10-3 – 10-4)

• Interference between direct decay and decay via mixing gives CPV phase: s= M -2D

• In Standard Model s 2 s = -2arg(VtsVtb*/VcsVcb

*) - 0.0363 ± 0.0017 rad

• Search for New Physics in mixing: s= sSM

+sNP

See also Pavel’s talk today

Page 21: LHCb results

XV Lomonosov conference, Moscow

Other channels relevant for s measurement

“Penguin” diagram dominated can help to control penguin effect in Bs→Ј/ψФ for s extraction :

• Bs→ФФ

• Bs→K*K* - The first observation ! Can help to extract s and

• Bs→Ј/ψK*

• Bs→K+K ־ - Most precise lifetime measurement !

Box diagram dominated can be used for s measurement :

• Bs→Ј/ψf0(980) - The first observation ! CP-odd eigenstate

• Bs→Ј/ψf2’(1525) - The first observation !

Phys. Lett. B 698 (2011) 115

LHCb-CONF-2011-035

LHCb-CONF-2011-018

LHCb-CONF-2011-019

LHCb-CONF-2011-025

Page 22: LHCb results

XV Lomonosov conference, Moscow

Results are consistent with SM prediction for forward-backward

asymmetry AFB, longitudinal polarization FL and differential

brunching fraction dBF/dq2:

Statistical errors are dominated now and will be improved with

more data. Systematical error is also expected to be improved with

more statistics.

Search for NP in rare decays: Bd → K*µµ • The most known observable sensitive to NP is AFB

• Current status: no evidence of zero-crossing point AFB(q2) predicted in SM

• LHCb can reach precision for ZCP Δq2 < 0.5 GeV2 at 2 fb-1

LHCb with 309 pb-1achieved (preliminary) the most precise measurement to date

LH

Cb

-CO

NF

-201

1-03

8

BaB

ar [

PR

D 7

9 (2

009)

], B

elle

[P

RL

103

(20

09)]

, CD

F [

PR

L 1

06 (

2011

)]

See also Dasha’s talk today

Page 23: LHCb results

XV Lomonosov conference, Moscow

Prospect: Bs,d → µµ

Prospect on the base of 37 pb-1 (2010):

• ~2 fb-1 will reach exclusion at SM level

• Observation will need more statistics

Golden mode: Bs,d → µµ • Ultra rare decays (FCNC and helicity suppressed)• SM predicts (via box and penguin diagrams):

BR(Bs → µµ) = (3.2 ± 0.2) · 10 -9

BR(Bd → µµ) = (1.1 ± 0.1) · 10 -10

With ~300 pb-1 of LHCb data at SM level after selection:

~3.2 Bs → µµ and ~0.32 Bd → µµ events

CDF reported the observation:

BR(Bs → µµ) = (1.8 +1.1-0.9) · 10 -8

arxiv: 1107.2304

• LHCb presents preliminary result with 300 pb-1

LHCb-CONF-2011-037:

BR(Bs0 → µµ) = 1.3 (1.6) · 10 -8 at 90%(95%)C.L.

BR(B0 → µµ) = 4.2 (5.2) · 10 -9 at 90%(95%)C.L.

• Combining with preliminary result with 37 pb-1

PLB 699(2011) 330,[hep-ex/1103.2165]

BR(Bs0 → µµ) = 1.2 (1.5) · 10 -8 at 90%(95%)C.L.

• Combining with CMS observationLHCb-CONF-2011-047:

BR(Bs0 → µµ) = 0.9 (1.1) · 10 -8 at 90%(95%)C.L.

Excess seen by CDF is not confirmed!~1 fb-1 allows a considerable constrain on MSSM

Most-precise measurement!

Page 24: LHCb results

XV Lomonosov conference, Moscow

Conclusion• In 2010-2011 LHCb collected more than 700 pb-1 of rich data demonstrating:

– Very good performance of trigger and data taking– Ability to work efficiently in hadronic environment– Ability to work with much larger luminosity than nominal (2 L -instant luminosity

and 6 - PV av. number)!• With 2010 data LHCb already has got competitive results with B-factories and

Tevatron• LHCb provided many world-class measurements:

– First observations of many B-decay modes– Production of heavy flavour quarks and quarkonium states

– World-best single measurement of direct CPV in B0s→K

– World-class measurements of CPV phase s, ∆ms

– Most precise measurements of rare decays Bd → K*µµ, Bs → µµ

• Expecting ~1 fb-1 of data this year and many most-precise measurements very soon!

• LHCb searches for New Physics with unprecedented precision!

Page 25: LHCb results

XV Lomonosov conference, Moscow

Thank You!

Page 26: LHCb results

XV Lomonosov conference, Moscow

BACK-UP

Page 27: LHCb results

XV Lomonosov conference, Moscow

LHCb prospects for upgrade

LHCb sensitivities for key observables

CERN-LHCC-2011-001

Page 28: LHCb results

XV Lomonosov conference, Moscow

First observations of B-decays in LHCb

• Bs DK* LHCb-CONF-2011-008

• B DK CS-mode, can be used for -measurements LHCb-CONF-2011-024

• B (2s) LHCb-CONF-2011-014 – mixing CP

• Bs J/K* penguin-suppressed LHCb-CONF-2011-025

• Bs K*barK* time-dependent CP LHCb-CONF-2011-019

• PLB 698(2011)14

• Bs J/ f0(980) mixing phase PLB 698(2011)115

• Bs J/ f2’(1525) mixing phase LHCb-CONF-2011-035

• Bc J/ first observation LHCb-CONF-2011-040

Page 29: LHCb results

XV Lomonosov conference, Moscow

Search for NP effects in Bd → K*µµ

• In SM via FCNC (box and penguin diagrams)

• Helicity structure is sensitive to right-handed and new scalar operators

• The most known observable sensitive to NP is AFB

• Current status: no evidence of zero-crossing point AFB(q2) predicted in SM

• LHCb can reach precision for ZCP Δq2 < 0.5 GeV2 at 2 fb-1

Page 30: LHCb results

XV Lomonosov conference, Moscow

Results are consistent with SM prediction for

forward-backward asymmetry AFB, longitudinal

polarization FL and differential brunching fraction dBF/dq2:

Statistical errors are dominated now and will improved

with more data. Systematical error is also expected to be

improved with more statistics.

LHCb analysis and results Bd → K*µµ Analysis strategy:• Events selection using Boosted Decision Tree (composition of topological and kinematical observables)• Correction for non-uniformity of reconstruction and selection• MC check with control channels• Validation using Bd→Ј/ψK*

• Fit the angular observables

LHCb with 309 pb-1achieved (preliminary) the most precise measurement to date

BaB

ar [

PR

D 7

9 (2

009)

], B

elle

[P

RL

103

(20

09)]

, CD

F [

PR

L 1

06 (

2011

)]

Page 31: LHCb results

XV Lomonosov conference, Moscow

CP-violation in Bs mixing: Bs→Ј/ψФ • Dominant contribution – tree-level diagram

• Contribution from “penguin” is small (10-3 – 10-4)

• Interference between direct decay and decay via mixing gives CPV phase: s= M -2D

• In Standard Model s 2 s = -2arg(VtsVtb*/VcsVcb

*) - 0.0363 ± 0.0017 rad

• Search New Physics in mixing: s= sSM

+sNP

Strategy to measure s :

• Trigger and select Bs→Ј/ψФ events

• measure proper time • Measure transversity angles of final decay

products to disentangle CP -odd and –even states• Tag initial flavor

• Fit s with other unknown parameters

LHCb relevant results:LHCb relevant results:• LHCb-CONF-2011-001:

Lifetime measurements of b →Ј/ψX

• LHCb-CONF-2011-005: from Bs→Ds

Δms = 17.63 ± 0.11(stat) ± 0.04(syst)

Flavour tagging studies:Flavour tagging studies:• LHCb-CONF-2011-002:

Bs→Ј/ψФ :

Γs = (0.680 ± 0.034stat ± 0.027syst) ps-1

ΔΓs = (0.084 ± 0.112stat ± 0.021syst) ps-1

• LHCb-CONF-2011-003:

Tagging efficiency measurements• LHCb-CONF-2011-004:

Time dependent analysis B0→Ј/ψKs

Decay D

Mixing M

See also Pavel’s talk today

Page 32: LHCb results

XV Lomonosov conference, Moscow

Expecting world best measurements s , Δms soon!

CP-violation phase results: Bs→Ј/ψФ

Year 2010:Nsig=836 ± 60

LHCb-CONF-2011-006: data from 2010 L=36 pb-1

“Toy” Monte-Carlo using 2010 data as distribution function, but for 10xlarger statistics

Results for 2011 data with much larger statistics are coming very soon

-> expecting world best

measurement of s!

Year 2011:

Standard Model value, probability = 22%(1.2σ)

Page 33: LHCb results

XV Lomonosov conference, Moscow

Rare decays: Bs,d → µµ • Ultra rare decays (FCNC and helicity suppressed)• SM predicts (via box and penguin diagrams):

BR(Bs → µµ) = (3.2 ± 0.2) · 10 -9

BR(Bd → µµ) = (1.1 ± 0.1) · 10 -10

CDF reported the observation:

BR(Bs → µµ) = (1.8 +1.1-0.9) · 10 -8

arxiv: 1107.2304

With ~300 pb-1 of LHCb data at SM level after selection:

~3.2 Bs → µµ and ~0.32 Bd → µµ events

• LHCb presents preliminary result with 300 pb-1

LHCb-CONF-2011-037:

BR(Bs0

→ µµ) = 1.3 (1.6) · 10 -8 at 90%(95%)C.L.

BR(B0 → µµ) = 4.2 (5.2) · 10 -9 at 90%(95%)C.L.

• Combining with preliminary result with 37 pb-1

PLB 699(2011) 330,[hep-ex/1103.2165]

BR(Bs0

→ µµ) = 1.2 (1.5) · 10 -8 at 90%(95%)C.L.

• Combining with CMS observationLHCb-CONF-2011-047:

BR(Bs0

→ µµ) = 0.9 (1.1) · 10 -8 at 90%(95%)C.L.

Excess seen by CDF is not confirmed

Page 34: LHCb results

XV Lomonosov conference, Moscow

Prospect: Bs,d → µµ Prospect on the base of 37 pb-1 (2010):• ~2 fb-1 will reach exclusion at SM level • Observation will need more statistics

~1 fb-1 allows a considerable constrain on MSSM

Page 35: LHCb results

XV Lomonosov conference, Moscow

LHCb-CONF-2011-019

The first observation of Bs→K*K*

Can help to extract s and

Other channels relevant for s • “Penguin” diagram dominated: Bs→ФФ Bs→K*K* Bs→Ј/ψK* Bs→K+K ־

LHCb-CONF-2011-025

Assuming all events are from K*→K for mass |M(K)-M(K*)|<150 MeV

Can help to control penguin effect in Bs→Ј/ψФ for s extraction

LHCb-CONF-2011-018

Most precise lifetime measurement of Bs→K+K ־

Can be used to put constrains on s and ΔΓs

Page 36: LHCb results

XV Lomonosov conference, Moscow

Other channels sensitive for s

• Box diagram dominated: Bs→Ј/ψf0(980) Bs→Ј/ψf2’(1525)

Phys. Lett. B 698 (2011) 115

The first observation of Bs→Ј/ψf0(980)

Statistics of 2010 ~34 pb-1

CP odd eigenstate

LHCb-CONF-2011-035

The first observation of Bs→Ј/ψf2’(1525)

Can be used for s measurement

Statistics of 2010 ~34 pb-1 + 125 pb-1 of 2011


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