Observation of the χb1 (3P) and χb2 (3P) and measurement of their masses

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Ambrogi, Federico and Asilar, Ece and Md. Ali, Mohd. Adli (2018) Observation of the χb1 (3P) and χb2 (3P) and measurement of their masses. Physical Review Letters, 121 (9). pp. 1-17. ISSN 0031-9007 E-ISSN 1079-7114

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Abstract

The χb1ð3PÞ and χb2ð3PÞ states are observed through their ϒð3SÞγ decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0 fb−1. The ϒð3SÞ mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to eþe− pairs in the silicon tracker, leading to a χbð3PÞ mass resolution of 2.2 MeV. This is the first time that the J ¼ 1 and 2 states are well resolved and their masses individually measured: 10513.42 0.41ðstatÞ 0.18ðsystÞ MeV and 10524.02 0.57ðstatÞ 0.18ðsystÞ MeV; they are determined with respect to the world-average value of the ϒð3SÞ mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60 0.64ðstatÞ 0.17ðsystÞ MeV.

Item Type:	Article (Journal)
Additional Information:	7861/70418
Uncontrolled Keywords:	χ b1ð3PÞ and χ b2ð3PÞ; Measurement of their masses
Subjects:	Q Science > Q Science (General) Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Physics
Depositing User:	Dr Mohd Adli MD Ali
Date Deposited:	31 Jan 2019 15:00
Last Modified:	15 Jul 2019 09:34
URI:	http://irep.iium.edu.my/id/eprint/70418

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