Compact Muon Solenoid
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| CMS-BPH-11-007 ; CERN-PH-EP-2012-124 | ||
| Measurement of the $\Lambda_b$ cross section and the $\overline{\Lambda}_b$ to $\Lambda_b$ ratio with J/$\psi\Lambda$ decays in pp collisions at $\sqrt{s}$ = 7 TeV | ||
| CMS Collaboration | ||
| 4 May 2012 | ||
| Phys. Lett. B 714 (2012) 136-157 | ||
| Abstract: The Lambda(b) differential production cross section and the cross-section ratio for anti-Lambda(b)/Lambda(b) production are measured as functions of transverse momentum pt(Lambda(b)) and rapidity y(Lambda(b)) in pp collisions at sqrt(s) = 7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Lambda(b) decays reconstructed in the exclusive final state J/Psi Lambda, with the subsequent decays J/Psi to an opposite sign muon pair and Lambda to proton pion, using a data sample corresponding to an integrated luminosity of 1.9 inverse femtobarns. The product of the cross section times the branching ratio for Lambda(b) to J/Psi Lambda versus pt(Lambda(b)) falls faster than that of b mesons. The measured value of the cross section times the branching ratio for pt(Lambda(b)) > 10 GeV and abs(y(Lambda(b))) < 2.0 is 1.02 +/- 0.06 +/- 0.12 nb, and the integrated cross section ratio for anti-Lambda(b)/Lambda(b) is 1.02 +/- 0.07 +/- 0.09, where the uncertainties are statistical and systematic, respectively. | ||
| Links: e-print arXiv:1205.0594 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; Public twiki page ; HepData record ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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