Study of direct CP violation in $B^{\pm} \to J/\psi K^{\pm}(\pi^{\pm})$ decays

Abazov, V.M.; Abbott, B.; Abolins, M.; Acharya, Bannanje Sripath; Adams, M.; Adams, T.; Aguilo, Ernest; Ahn, S.H.; Ahsan, M.; Alexeev, G.D.

doi:10.1103/PhysRevLett.100.211802

Study of direct CP violation in $B^{\pm} \to J/\psi K^{\pm}(\pi^{\pm})$ decays

D0

Collaboration

Feb, 2008

7 pages

Published in:

Phys.Rev.Lett. 100 (2008) 211802

e-Print:

0802.3299 [hep-ex]

DOI:

10.1103/PhysRevLett.100.211802

PDG:

\mathit A_{CP}({{\mathit B}^{+}}

\rightarrow

{{\mathit J / \psi}{(1S)}}{{\mathit K}^{+}}

)

Report number:

FERMILAB-PUB-08-039-E

Experiments:

FNAL-E-0823

View in:

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Abstract: (arXiv)

We present a search for direct CP violation in

B^{\pm} \to J/\psi K^{\pm}(\pi^{\pm})

decays. The event sample is selected from 2.8 fb

^{-1}

of

p\bar{p}

collisions recorded by D0 experiment in Run II of the Fermilab Tevatron Collider. The charge asymmetry

A_{CP}(B^+ \to J/\psi K^+) = +0.0075 \pm 0.0061

(stat.)

\pm 0.0027

(syst.) is obtained using a sample of approximately 40 thousand

B^{\pm} \to J/\psi K^{\pm}

decays. The achieved precision is of the same level as the expected deviation predicted by some extensions of the standard model. We also measured the charge asymmetry

A_{CP}(B^+ \to J/\psi \pi^+) = -0.09 \pm 0.08

(stat.)

\pm 0.03

(syst.).

Note:

7 pages, 3 figures

11.30.Er
14.40.Nd
12.15.Hh
13.25.Hw
anti-p p: colliding beams
bottom: pair production
B: hadronic decay
J/psi(3100)
charge: asymmetry
CP: violation

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Study of direct CP violation in B±→J/ψK±(π±)B^{\pm} \to J/\psi K^{\pm}(\pi^{\pm})B±→J/ψK±(π±) decays

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Study of direct CP violation in $B^{\pm} \to J/\psi K^{\pm}(\pi^{\pm})$ decays