A first study of CP violation in the decay modes B±→KS0K±π∓Dh± and B±→KS0K∓π±Dh±, where h labels a K or π meson and D labels a D0 or D‾0 meson, is performed. The analysis uses the LHCb data set ...collected in pp collisions, corresponding to an integrated luminosity of 3 fb−1. The analysis is sensitive to the CP-violating CKM phase γ through seven observables: one charge asymmetry in each of the four modes and three ratios of the charge-integrated yields. The results are consistent with measurements of γ using other decay modes.
Abstract The ratio of branching fractions of the decays Λ b 0 $$ {\Lambda}_b^0 $$ → pK − e + e − and Λ b 0 $$ {\Lambda}_b^0 $$ → pK − μ + μ − , R pK − 1 $$ {R}_{pK}^{-1} $$ , is measured for the ...first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb −1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q 2 < 6.0 GeV2 /c 4 and the pK − mass range m(pK − ) < 2600 MeV/c 2, the ratio of branching fractions is measured to be R pK − 1 = 1.17 − 0.16 + 0.18 ± 0.07 $$ {R}_{pK}^{-1}={1.17}_{-0.16}^{+0.18}\pm 0.07 $$ , where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λ b 0 $$ {\Lambda}_b^0 $$ → pK − e + e − .
Observation of the Λ b 0 → J/ψ pπ − decay Albrecht, J.; Aslanides, E.; Bachmann, S. ...
The journal of high energy physics,
7/2014, Letnik:
2014, Številka:
7
Journal Article
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract A measurement of the inclusive W arrow right muν production cross-section using data from pp collisions at a ...centre-of-mass energy of ... TeV is presented. The analysis is based on an integrated luminosity of about 1.0 fb-1 recorded with the LHCb detector. Results are reported for muons with a transverse momentum greater than 20 GeV/c and pseudorapidity between 2.0 and 4.5. The W + and W - production cross-sections are measured to be ... ... where the first uncertainty is statistical, the second is systematic and the third is due to the luminosity determination. Cross-section ratios and differential distributions as functions of the muon pseudorapidity are also presented. The ratio of W + to W - cross-sections in the same fiducial kinematic region is determined to be ... where the uncertainties are statistical and systematic, respectively. Results are in good agreement with theoretical predictions at next-to-next-to-leading order in perturbative quantum chromodynamics. Figure not available: see fulltext.
PDF
