Measurement of the Λb Polarization and Angular Parameters in Λb→J/ψΛ Decays from pp Collisions at √s =7 and 8 TeV

Physical Review D - Particles, Fields, Gravitation and Cosmology 2018
Viesturs Veckalns, CERN international group of authors

An analysis of the bottom baryon decay Λb→J/ψ(→μ+μ-)Λ(→pπ-) is performed to measure the Λb polarization and three angular parameters in data from pp collisions at s=7 and 8 TeV, collected by the CMS experiment at the Large Hadron Collider. The Λb polarization is measured to be 0.00±0.06(stat)±0.06(syst) and the parity-violating asymmetry parameter is determined to be 0.14±0.14(stat)±0.10(syst). The measurements are compared to various theoretical predictions, including those from perturbative quantum chromodynamics.

DOI
10.1103/PhysRevD.97.072010
Hipersaite
https://journals.aps.org/prd/abstract/10.1103/PhysRevD.97.072010

Veckalns, V., international group of authors, C. Measurement of the Λb Polarization and Angular Parameters in Λb→J/ψΛ Decays from pp Collisions at √s =7 and 8 TeV. Physical Review D - Particles, Fields, Gravitation and Cosmology, 2018, Vol.97, No.7, 1.-10.lpp. ISSN 2470-0010. e-ISSN 2470-0029. Pieejams: doi:10.1103/PhysRevD.97.072010

Publikācijas valoda
English (en)