Measurement of the Λb polarization and angular parameters in Λb → J=ψΛ decays from pp collisions at √s=7 and 8 TeV

dc.contributor.author	Sirunyan, A. M.	pt_BR
dc.contributor.author	Silveira, Gustavo Gil da	pt_BR
dc.contributor.author	CMS Collaboration	pt_BR
dc.date.accessioned	2018-06-21T02:32:04Z	pt_BR
dc.date.issued	2018	pt_BR
dc.identifier.issn	1550-7998	pt_BR
dc.identifier.uri	http://hdl.handle.net/10183/179601	pt_BR
dc.description.abstract	An analysis of the bottom baryon decay Λb → J=ψ ð→ μþ μ−ÞΛð→ pπ−Þ 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 ± 0.06ðstatÞ± 0.06ðsystÞ and the parity-violating asymmetry parameter is determined to be 0.14 ± 0.14ðstatÞ± 0.10ðsystÞ. The measurements are compared to various theoretical predictions, including those from perturbative quantum chromodynamics.	en
dc.format.mimetype	application/pdf	pt_BR
dc.language.iso	eng	pt_BR
dc.relation.ispartof	Physical review. D, Particles, fields, gravitation, and cosmology. College Park. Vol. 97, no. 7 (Apr. 2018), 072010, 20 p.	pt_BR
dc.rights	Open Access	en
dc.subject	Colisões proton-proton	pt_BR
dc.subject	Aceleradores de partículas	pt_BR
dc.subject	Cromodinâmica quântica	pt_BR
dc.title	Measurement of the Λb polarization and angular parameters in Λb → J=ψΛ decays from pp collisions at √s=7 and 8 TeV	pt_BR
dc.type	Artigo de periódico	pt_BR
dc.identifier.nrb	001066846	pt_BR
dc.type.origin	Estrangeiro	pt_BR

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