
Open access
Author
CMS Collaboration
Sirunyan, Albert M.
Backhaus, Malte
Bäni, Lukas
Berger, Pirmin
Chernyavskaya, Nadezda
Dissertori, Günther
Dittmar, Michael
Donegà, Mauro
Dorfer, Christian
Grab, Christophorus
Heidegger, Constantin
Hits, Dmitry
Hoss, Jan
Klijnsma, Thomas
Lustermann, Werner
Manzoni, Riccardo A.
Marionneau, Matthieu
Meinhard, Maren T.
Micheli, Francesco
Musella, Pasquale
Nessi-Tedaldi, Francesca
Pata, Joosep
Pauss, Felicitas
Perrin, Gaël
Perrozzi, Luca
Pigazzini, Simone
Quittnat, Milena
Ruini, Daniele
Sanz Becerra, Diego A.
Schönenberger, Myriam
Shchutska, Lesya
Tavolaro, Vittorio R.
Theofilatos, Konstantinos
Vesterbacka Olsson, Minna L.
Wallny, Rainer
Zhu, De H.
et al.
Date
2018-08-31Type
- Journal Article
Abstract
The χb1(3P) and χb2(3P) states are observed through their Υ(3S)γ 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 Υ(3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e+e− pairs in the silicon tracker, leading to a χb(3P) mass resolution of 2.2 MeV. This is the first time that the J=1 and 2 states are well resolved and their masses individually measured: 10513.42±0.41(stat)±0.18(syst) MeV and 10524.02±0.57(stat)±0.18(syst) MeV; they are determined with respect to the world-average value of the Υ(3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60±0.64(stat)±0.17(syst) MeV. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000295592Publication status
publishedJournal / series
Physical Review LettersVolume
Pages / Article No.
Publisher
American Physical SocietyOrganisational unit
03593 - Dissertori, Günther / Dissertori, Günther
03904 - Wallny, Rainer / Wallny, Rainer
08803 - Grab, Christoph (Tit.Prof.)
09631 - Shchutska, Lesya (ehemalig) / Shchutska, Lesya (former)
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