Observation of New Charmless Decays of Bottom Hadrons

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Aaltonen , T , Mehtälä , P , Orava , R , Mäki , T , Saarikko , H , Österberg , K & CDF Collaboration 2009 , ' Observation of New Charmless Decays of Bottom Hadrons ' Physical Review Letters , vol 103 , no. 3 , pp. 031801 . DOI: 10.1103/PhysRevLett.103.031801

Title: Observation of New Charmless Decays of Bottom Hadrons
Author: Aaltonen, T.; Mehtälä, Petteri; Orava, Risto; Mäki, Tuula; Saarikko, Heimo; Österberg, Kenneth; CDF Collaboration
Contributor: University of Helsinki, Helsinki Institute of Physics (HIP) (-2009)
University of Helsinki, Helsinki Institute of Physics (HIP) (-2009)
University of Helsinki, Department of Physics (-2009)
University of Helsinki, Helsinki Institute of Physics (HIP) (-2009)
University of Helsinki, Department of Physics (-2009)
University of Helsinki, Department of Physics (-2009)
Belongs to series: Physical Review Letters
ISSN: 0031-9007
Abstract: 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-) K+pi-)$ as a reference.
Peer review status: Peer reviewed
URI: http://hdl.handle.net/10138/24481
Date: 2009
Subject: 114 Physical sciences
hep-ex
hep-ph
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