Observation of the χb1 (3P) and χb2 (3P) and measurement of their masses
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 ϒð3S...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
American Physical Society
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/70418/ http://irep.iium.edu.my/70418/ http://irep.iium.edu.my/70418/ http://irep.iium.edu.my/70418/3/70418_Observation%20of%20the%20%CF%87%20b1%C3%B03P%C3%9E%20and%20%CF%87%20b2%C3%B03P%C3%9E%20and%20Measurement%20_article_new.pdf http://irep.iium.edu.my/70418/4/70418_Observation%20of%20the%20%CF%87%20b1%C3%B03P%C3%9E%20and%20%CF%87%20b2%C3%B03P%C3%9E%20and%20Measurement%20_scopus.pdf |
| Summary: | 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. |
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