Observation of New Charmless Decays of Bottom Hadrons - INSPIRE

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Observation of New Charmless Decays of Bottom Hadrons

CDF

Collaboration

Dec, 2008

8 pages

Published in:

Phys.Rev.Lett. 103 (2009) 031801

e-Print:

0812.4271 [hep-ex]

DOI:

10.1103/PhysRevLett.103.031801

PDG:

{{\mathit \Lambda}_{{{b}}}^{0}}

\rightarrow

{{\mathit p}}{{\mathit K}^{-}}

Report number:

FERMILAB-PUB-08-573-E

Experiments:

FNAL-E-0830

View in:

reference search96 citations

Citations per year

Abstract: (arXiv)

We search for new charmless decays of neutral b-hadrons to pairs of charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 1 fb-1 of integrated luminosity, we report the first observation of the B0s->K-pi+ decay, with a significance of 8.2 sigma, and measure BR(B0s->K-pi+)= (5.0+-0.7(stat)+-0.8(syst))*10^{-6}. We also report the first observation of charmless b-baryon decays in the channels Lambda_b -> p pi and Lambda_b -> pK with significances of 6.0 sigma and 11.5 sigma respectively, and we measure BR(Lambda_b->p pi-) = (3.5+-0.6(stat)+-0.9(syst))*10^{-6} and BR(Lambda_b->p K-) = (5.6+-0.8(stat)+-1.5(syst))*10^{-6}. No evidence is found for the decays B0->K+K- and B0s -> pi+pi-, and we set an improved upper limit BR(B0s -> pi+pi-) < 1.2*10^{-6}

at the 90% confidence level. All quoted branching fractions are measured using BR(B0->K+pi-)

as a reference.

Note:

Submitted to Phys. Rev. Lett

14.40.Nd
13.25.Hw
anti-p p: interaction
bottom particle: hadronic decay
final state: (0charm)
final state: two-particle
B0: branching ratio
B/s0: branching ratio
Lambda/b0: branching ratio
upper limit

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