Measurement of the Λb polarization and angular parameters in $\Lambda b \to J/\psi\, \Lambda$ decays from pp collisions at $\sqrt s$ = 7 and 8 TeV

CMS Collaboration; Canelli, Maria Florencia; Kilminster, Benjamin; Aarrestad, Thea K; Brzhechko, Danyyl; Caminada, Lea; De Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hreus, Tomas; Leontsinis, Stefanos; Mikuni, Vinicius Massami; Neutelings, Izaak; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Wertz, Sebastien; Zucchetta, Alberto (2018). Measurement of the Λb polarization and angular parameters in $\Lambda b \to J/\psi\, \Lambda$ decays from pp collisions at $\sqrt s$ = 7 and 8 TeV. Physical Review. D, Particles, fields, gravitation and cosmology, D97(7):072010.

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 $\sqrt s=7$ 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.

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 $\sqrt s=7$ 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.

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