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.

1 Bookmark
·
159 Views
• ##### Article: Measurement of the Lifetime of the B{sub c}{sup {+-}} Meson in the Semileptonic Decay Channel
[Hide abstract]
ABSTRACT: Using approximately 1.3 fb¹ of data collected by the D0 detector between 2002 and 2006, we measure the lifetime of the B{sub c}{sup {+-}} meson in the B{sub c}{sup {+-}}J/{sup {+-}}+X final state. A simultaneous unbinned likelihood fit to the J/+ invariant mass and lifetime distributions yields a signal of 881{+-}80(stat) candidates and a lifetime measurement of (B{sub c}{sup {+-}})=0.448{sub -0.036}{sup +0.038}(stat){+-}0.032(syst) ps.
Physical Review Letters - PHYS REV LETT. 01/2009; 102(9):092001-092001.
• ##### Article: The LHCb Detector at the LHC
[Hide abstract]
ABSTRACT: The LHCb experiment is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN (Geneva). The initial configuration and expected performance of the detector and associated systems, as established by test beam measurements and simulation studies, is described.
Journal of Instrumentation 08/2008; 3(08):S08005. · 1.66 Impact Factor
• Source
##### Article: Observation of the B_c Meson in p-bar p Collisions at sqrt{s} = 1.8 TeV
[Hide abstract]
ABSTRACT: We have observed bottom-charm mesons B_c via the decay mode Bc -> J/psi lepton neutrino in 1.8 TeV p-bar p collisions using the CDF detector at the Fermilab Tevatron. A fit of background and signal contributions to the J/psi + lepton mass distribution yielded 20.4 +6.2 -5.5 events from B_c mesons. A fit to the same distribution with background alone was rejected at the level of 4.8 standard deviations. We measured the B_c mass to be 6.40 +- 0.39 +- 0.13 GeVc^2 and the B_c lifetime to be tau(B_c) = 0.46 +0.18 -0.16 +- 0.03 ps. We measured the production cross section times branching ratio for B_c -> J/psi lepton neutrino relative to that for B+ -> J/psi K to be 0.132 +0.041 -0.037 (stat) +- 0.031 (syst) +0.032 -0.020 (lifetime). Comment: 13 pages, 3 figures. Submitted to Physical Review Letters. Available at http://www-cdf.fnal.gov/physics/pub98/cdf4496_Bc_PRL.ps
05/1998;