Study of the production of and hadrons in pp collisions and first measurement of the branching fraction
Name
Aaij_2016_Chinese_Phys._C_40_011001.pdf
Description
Published version
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464.33 KB
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Unknown
Checksum (MD5)
32f26b8c8605bf78756eee9bf53afa01
Author(s)
The LHCb Collaboration
Ilten, Philip J
Williams, Michael
Date Issued
2016
Journal
Chinese Physics C
Publisher
IOP Publishing
Citation
Aaij, R., et al. "Study of the Production of a(B)(0) and (B)over-Bar(0) Hadrons in Pp Collisions and First Measurement of the a(B)(0)-> J/Psi Pk(-) Branching Fraction." Chinese Physics C 40 1 (2016).
Version
Final published version
Abstract
© 2015 Article funded by SCOAP3 and published under licence by Chinese Physical Society. The product of the Λ0b(B0) differential production cross-section and the branching fraction of the decay Λ0bJ= pK.. (B0!J= K Λ (892)0) is measured as a function of the beauty hadron transverse momentum, pT, and rapidity, y. The kinematic region of the measurements is pT >20 GeV=c and 2:0>y>4:5. The measurements use a data sample corresponding to an integrated luminosity of 3fb..1 collected by the LHCb detector in pp collisions at centre-of-mass energies ps = 7 TeV in 2011 and ps = 8 TeV in 2012. Based on previous LHCb results of the fragmentation fraction ratio, fΛ0 b =fd, the branching fraction of the decay Λ0 b!J= pK.. is measured to be B(Λ0 bJ= pK..)=(3:17±0:04±0:07±0:34+0:45 ..0:28 )10..4 ; where the first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the branching fraction of the decay B0J= K Λ (892)0, and the fourth is due to the knowledge of fΛ0 b =fd. The sum of the asymmetries in the production and decay between Λ0 b and Λ 0 b is also measured as a function of pT and y. The previously published branching fraction of Λ0 b ! J= p.., relative to that of Λ0 b ! J= pK.., is updated. The branching fractions of Λ0 b!P+ c (!J= p)K.. are determined.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 3.0 unported license
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DOI of Published Version
https://doi.org/10.1088/1674-1137/40/1/011001
