Article

# First observation of the decay Bc+ to J/psi pi+pi-pi+

• ##### L. Zhong
03/2012; DOI: 10.1103/PhysRevLett.108.251802
Source: arXiv

ABSTRACT The decay Bc+ --> J/psi pi+pi-pi+ is observed for the first time, using 0.8
fb-1 of pp collisions at sqrt{s}=7 TeV collected by the LHCb experiment. The
ratio of branching fractions BR(Bc+ --> J/psi pi+pi-pi+)/BR(B_c+ --> J/psi pi+)
is measured to be 2.41+-0.30+-0.33, where the first uncertainty is statistical
and the second systematic. The result is in agreement with theoretical
predictions.

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##### Article: Performance of the LHCb RICH detector at the LHC
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ABSTRACT: The LHCb experiment has been taking data at the Large Hadron Collider (LHC) at CERN since the end of 2009. One of its key detector components is the Ring-Imaging Cherenkov (RICH) system. This provides charged particle identification over a wide momentum range, from 2-100 GeV/c. The operation and control software, and online monitoring of the RICH system are described. The particle identification performance is presented, as measured using data from the LHC. Excellent separation of hadronic particle types (pion, kaon and proton) is achieved.
European Physical Journal C 11/2012; 73(5). · 5.25 Impact Factor