Measurement of the time-dependent $CP$ asymmetry in $B^0 \to J/\psi K^0_{\rm S}$ decays

This Letter reports a measurement of the CP violation observables SJ/ψKS0 and CJ/ψKS0 in the decay channel B0→J/ψKS0 performed with 1.0 fb−1 of pp collisions at s=7 TeV collected by the LHCb experiment. The fit to the data yields SJ/ψKS0=0.73±0.07(stat)±0.04(syst) and CJ/ψKS0=0.03±0.09(stat)±0.01(syst) . Both values are consistent with the current world averages and within expectations from the Standard Model.

asymmetry: CP: time dependence
CP: violation
p p: scattering
LHC-B
B0: hadronic decay
experimental results
standard model: validity test
CERN LHC Coll
B0 --> J/psi(3100) K0(S)
7000 GeV-cms

References(25)

Figures(5)

[1]

CP Violation in the Renormalizable Theory of Weak Interaction

Makoto Kobayashi
(
- Kyoto U.
)
,
Toshihide Maskawa
(
- Kyoto U.
)

- Prog.Theor.Phys. 49 (1973) 652-657,
- Also in *Lichtenberg, D. B. (Ed.), Rosen, S. P. (Ed.): Developments In The Quark Theory Of Hadrons, Vol. 1*, 218-223.
•
DOI:
- 10.1143/PTP.49.652

[2]

Unitary Symmetry and Leptonic Decays

Nicola Cabibbo
(
- CERN
)

- Phys.Rev.Lett. 10 (1963) 531-533,
- Also in *Bologna 1984, Proceedings, Fifty years of weak-interaction physics* 648-649
•
DOI:
- 10.1103/PhysRevLett.10.531

[3]

CP Violation in B Meson Decays

Ashton B. Carter
(
- Rockefeller U.
)
,
A.I. Sanda
(
- Rockefeller U.
)

- Phys.Rev.D 23 (1981) 1567
•
DOI:
- 10.1103/PhysRevD.23.1567

[4]

CP Violation in Heavy Flavor Decays: Predictions and Search Strategies

Ikaros I.Y. Bigi
(
- SLAC
)
,
A.I. Sanda
(
- Rockefeller U.
)

- Nucl.Phys.B 281 (1987) 41-71
•
DOI:
- 10.1016/0550-3213(87)90246-X

[5]

Measurement of Time-Dependent CP Asymmetry in B0 ---> c anti-c K(*)0 Decays

BaBar

Collaboration

•

Bernard Aubert
(
- Annecy, LAPP
)

et al.

- Phys.Rev.D 79 (2009) 072009
•
e-Print:
- 0902.1708
•
DOI:
- 10.1103/PhysRevD.79.072009

[6]

Precise measurement of the CP violation parameter $\sin2\phi_1$ in $B^0\to(c\bar c)K^0$ decays

Belle

Collaboration

•

I. Adachi
(
- KEK, Tsukuba
)

et al.

- Phys.Rev.Lett. 108 (2012) 171802
•
e-Print:
- 1201.4643
•
DOI:
- 10.1103/PhysRevLett.108.171802

[7]

Averages of B-Hadron, C-Hadron, and $\tau$ -Lepton Properties as of early 2012

HFLAV

Collaboration

•

Y. Amhis
(
- LPHE, Lausanne
)

et al.

e-Print:
- 1207.1158

[8]

The LHCb Detector at the LHC

LHCb

Collaboration

•

A.Augusto Alves, Jr.
(
- Rio de Janeiro, CBPF
)

et al.

- JINST 3 (2008) S08005
•
DOI:
- 10.1088/1748-0221/3/08/S08005

[9]

Review of Particle Physics (RPP)

J. Beringer
(
- LBL, Berkeley
)
,
J.F. Arguin
(
- LBL, Berkeley and
- Montreal U.
)
,
R.M. Barnett
(
- LBL, Berkeley
)
,
K. Copic
(
- LBL, Berkeley
)
,
O. Dahl
(
- LBL, Berkeley
)

et al.

- Phys.Rev.D 86 (2012) 010001
•
DOI:
- 10.1103/PhysRevD.86.010001

[10]

Decay chain fitting with a Kalman filter

Wouter D. Hulsbergen
(
- Maryland U.
)

- Nucl.Instrum.Meth.A 552 (2005) 566-575
•
e-Print:
- physics/0503191
•
DOI:
- 10.1016/j.nima.2005.06.078

[11]

PYTHIA 6.4 Physics and Manual

Torbjorn Sjostrand
(
- Lund U., Dept. Theor. Phys.
)
,
Stephen Mrenna
(
- Fermilab
)
,
Peter Z. Skands
(
- Fermilab
)

- JHEP 05 (2006) 026
•
e-Print:
- hep-ph/0603175
•
DOI:
- 10.1088/1126-6708/2006/05/026

[12]

Handling of the generation of primary events in Gauss, the LHCb simulation framework, Nuclear Science Symposium Conference Record (NSS/MIC) (2010) 1155