Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV
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The CMS Collaboration , Sirunyan , A M , Eerola , P , Kirschenmann , H , Pekkanen , J , Voutilainen , M , Havukainen , J , Heikkilä , J K , Järvinen , T , Karimäki , V , Kinnunen , R , Lampén , T , Lassila-Perini , K , Laurila , S , Lehti , S , Lindén , T , Luukka , P , Mäenpää , T , Siikonen , H , Tuominen , E , Tuominiemi , J & Tuuva , T 2019 , ' Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV ' , Physical Review Letters , vol. 122 , no. 13 , 132001 . https://doi.org/10.1103/PhysRevLett.122.132001
| Title: | Observation of Two Excited B-c(+) States and Measurement of the B-c(+) (2S) Mass in pp Collisions at root s=13 TeV |
| Author: | The CMS collaboration; Sirunyan, A. M.; Eerola, P.; Kirschenmann, H.; Pekkanen, J.; Voutilainen, M.; Havukainen, J.; Heikkilä, J. K.; Järvinen, T.; Karimäki, V.; Kinnunen, R.; Lampén, T.; Lassila-Perini, K.; Laurila, S.; Lehti, S.; Lindén, T.; Luukka, P.; Mäenpää, T.; Siikonen, H.; Tuominen, E.; Tuominiemi, J.; Tuuva, T. |
| Contributor: | University of Helsinki, Department of Physics University of Helsinki, Department of Physics University of Helsinki, Department of Physics University of Helsinki, Department of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics University of Helsinki, Helsinki Institute of Physics |
| Date: | 2019-04-02 |
| Language: | eng |
| Number of pages: | 17 |
| Belongs to series: | Physical Review Letters |
| ISSN: | 0031-9007 |
| URI: | http://hdl.handle.net/10138/301435 |
| Abstract: | Signals consistent with the B-c(+)(2S) and B-c*(+)(2S) states are observed in proton-proton collisions at root s = 13 TeV, in an event sample corresponding to an integrated luminosity of 143 fb(-1), collected by the CMS experiment during the 2015-2018 LHC running periods. These excited (b) over barc states are observed in the B-c(+)pi(+)pi(-) invariant mass spectrum, with the ground state B-c(+) reconstructed through its decay to J/psi pi(+). The two states are reconstructed as two well-resolved peaks, separated in mass by 29.1 +/- 1.5(stat) +/- 0.7(syst) MeV. The observation of two peaks, rather than one, is established with a significance exceeding five standard deviations. The mass of the B-c(+)(2S) meson is measured to be 6871.0 +/- 1.2(stat) +/- 0.8(syst) +/- 0.8(B-c(+)) MeV, where the last term corresponds to the uncertainty in the world-average B-c(+) mass. |
| Subject: |
114 Physical sciences
B-C SPECTROSCOPY MESONS |
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