Evidence for the charmless annihilation decay mode $B^0_s \to \pi^+\pi^-$

Aaltonen, T.; Alvarez Gonzalez, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.; Apollinari, G.; Appel, J.A.; Arisawa, T.

doi:10.1103/PhysRevLett.108.211803

Evidence for the charmless annihilation decay mode $B^0_s \to \pi^+\pi^-$

CDF

Collaboration

Nov, 2011

8 pages

Published in:

Phys.Rev.Lett. 108 (2012) 211803

e-Print:

1111.0485 [hep-ex]

DOI:

10.1103/PhysRevLett.108.211803

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit K}^{+}}{{\mathit K}^{-}}

Report number:

FERMILAB-PUB-11-585-E

Experiments:

FNAL-E-0830

View in:

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reference search58 citations

Citations per year

Abstract: (arXiv)

We search for annihilation decay modes of neutral

b

mesons into pairs of charmless charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 6 fb

^{-1}

of integrated luminosity, we obtain the first evidence for the

B^0_s \to \pi^+\pi^-

decay, with a significance of

3.7\sigma

, and a measured branching ratio

\mathcal{B}(B^0_s \to \pi^+\pi^-)= (0.57 \pm 0.15 (stat) \pm 0.10 (syst))\times 10^{-6}

. A search for the

B^0 \to K^+K^-

mode in the same sample yields a significance of

2.0\sigma

, and a central value estimate

\mathcal{B}(B^0 \to K^+K^-)= (0.23 \pm 0.10 (stat) \pm 0.10 (syst))\times 10^{-6}

.

Note:

8 pages, 3 figures, 2 tables. Accepted by Phys.Rev.Lett

13.25.Hw
14.40.Nd
B/s0: branching ratio: measured
annihilation
decay modes
CDF
Batavia TEVATRON Coll
B/s0 --> pi+ pi-
B/s0 --> K+ K-

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Evidence for the charmless annihilation decay mode Bs0→π+π−B^0_s \to \pi^+\pi^-Bs0​→π+π−

Citations per year

Evidence for the charmless annihilation decay mode $B^0_s \to \pi^+\pi^-$