Observation of Two Excited B+c States and Measurement of the B+c(2S) Mass in pp Collisions at √s=13  TeV

Observation of Two Excited B+c States and Measurement of the B+c(2S) Mass in pp Collisions at √s=13  TeV

Bibliographic Details
Parent link:Physical Review Letters
Vol. 122, iss. 13.— 2019.— [132001, 17 p.]
Corporate Author: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Other Authors: Sirunyan A. M., Tumasyan A. R., Adam W. Wolfgang, Ambrogi F. Federico, Bergauer T. Thomas, Babaev A. A. Anton Anatoljevich, Yuzhakov A. D. Aleksandr Dmitrievich, Okhotnikov V. V. Vitaly Vladimirovich
Summary:Title screen
Signals consistent with the B+c(2S) and B*+c(2S) states are observed in proton-proton collisions at √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 ¯bc states are observed in the B+cπ+π− invariant mass spectrum, with the ground state B+c reconstructed through its decay to J/ψπ+. 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.
Режим доступа: по договору с организацией-держателем ресурса
Published: 2019
Subjects:
электронный ресурс
труды учёных ТПУ
Online Access:https://doi.org/10.1103/PhysRevLett.122.132001
Format: Electronic Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663685
Description
Summary:Title screen
Signals consistent with the B+c(2S) and B*+c(2S) states are observed in proton-proton collisions at √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 ¯bc states are observed in the B+cπ+π− invariant mass spectrum, with the ground state B+c reconstructed through its decay to J/ψπ+. 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.
Режим доступа: по договору с организацией-держателем ресурса
DOI:10.1103/PhysRevLett.122.132001

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