Measurement of the Lambda(b) Polarization and Angular Parameters in Lambda(b) -> J/Psi Lambda Decays From Pp Collisions at Root S=7 and 8 Tev
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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.
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Particle decays, Tellurium compounds, Readout systems, Quantum chromodynamics, pp colliosns, 7000 GeV-cms8000 GeV-cms, Physics, Particles & Fields, High Energy Physics - Experiment, J/psi(3100) --> muon+ muon-, S040A01, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], info:eu-repo/classification/ddc/530, 8000 GeV-cms, BARYONS, [Anahtar Kelime Yok], CMS, Physics, 320, muon: pair production, J/psi(3100): leptonic decay, CERN LHC Coll, Q1 Science (General) / természettudomány általában, 7000 GeV-cms, Physical Sciences, PARTICLE PHYSICS, Lambda/b0 --> J/psi(3100) Lambda, Lambda/b0: hadronic decay, asymmetry, Lambda --> p pi-, p p: scattering, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], bottom baryon decay, Particles & Fields, WEAK DECAYS; BARYONS, Fizik, Astronomy & Astrophysics, J/psi(3100) --> muon+ muon-, Lambda --> p pi-, 530, polarization: measured, parity: violation, Lambda/b0 --> J/psi(3100) Lambda, quantum chromodynamics: perturbation theory, Science & Technology, Lambda/b0: polarization, PARTICLE PHYSICS;LARGE HADRON COLLIDER;CMS, hep-ex, LARGE HADRON COLLIDER, Lambda: hadronic decay, WEAK DECAYS, p p: colliding beams, experimental results
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01 natural sciences, 06 humanities and the arts, 0103 physical sciences, 0105 earth and related environmental sciences, 0604 arts
Citation
Sirunyan, A.M., Tumasyan, A., Adam, W., Ambrogi, F., Asilar, E., Bergauer, T., Brandstetter, J. ...CMS Collaboration (2018). 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, 97(7). doi:10.1103/PhysRevD.97.072010
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Q1
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Q1
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Physical Review D
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97
Issue
7
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