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.
Measurement of the Lambda_b polarization and angular parameters in Lambda_b -> J/psi Lambda decays from pp collisions at sqrt(s) = 7 and 8 TeV / Belforte, S.; Candelise, V.; Casarsa, M.; Cossutti, F.; DELLA RICCA, G.; Zanetti, A.; ET AL (the CMS, Collaboration). - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - STAMPA. - 97:(2018), pp. 072010.1-072010.20. [10.1103/PhysRevD.97.072010]
Measurement of the Lambda_b polarization and angular parameters in Lambda_b -> J/psi Lambda decays from pp collisions at sqrt(s) = 7 and 8 TeV
CANDELISE, V.;DELLA RICCA, G.;
2018-01-01
Abstract
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.| File | Dimensione | Formato | |
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