Measurement of the Λb\Lambda_b Cross Section and the Λˉb{\bar{\Lambda}_b} to Λb\Lambda_b Ratio with J/ΨΛJ/\Psi \Lambda Decays in pppp Collisions at s=7\sqrt{s}=7 TeV

Collaboration
May, 2012
22 pages
Published in:
  • Phys.Lett.B 714 (2012) 136-157
  • Published: Jul 16, 2013
e-Print:
Report number:
  • CMS-BPH-11-007,
  • CERN-PH-EP-2012-124
Experiments:

Citations per year

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Abstract: (Elsevier)
The Λb differential production cross section and the cross section ratio σ(Λ¯b)/σ(Λb) are measured as functions of transverse momentum pTΛb and rapidity |yΛb| in pp collisions at s=7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Λb decays reconstructed in the exclusive final state J/ψΛ , with the subsequent decays J/ψ→μ+μ− and Λ→pπ , using a data sample corresponding to an integrated luminosity of 1.9 fb−1 . The product σ(Λb)×B(Λb→J/ψΛ) versus pTΛb falls faster than that of b mesons. The measured value of σ(Λb)×B(Λb→J/ψΛ) for pTΛb>10 GeV and |yΛb|<2.0 is 1.16±0.06±0.12 nb , and the integrated σ(Λ¯b)/σ(Λb) ratio is 1.02±0.07±0.09 , where the uncertainties are statistical and systematic, respectively.
Note:
  • Submitted to Physics Letters B
  • CMS
  • B physics
  • Lambda/b0: hadroproduction
  • channel cross section: ratio
  • p p: scattering
  • Lambda/b0: hadronic decay
  • J/psi(3100): leptonic decay
  • CMS
  • experimental results
  • CERN LHC Coll