Signals consistent with the B_c^+(2S) and B_c^*+(2S) states are observed in proton-proton collisions at sqrt[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 ¯]c states are observed in the B_c^+π^+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.

Observation of Two Excited B_c^+ States and Measurement of the B_c^+(2S) Mass in pp Collisions at sqrt[s]=13  TeV

Giannini, L;Ligabue, F;Manca, E;Mandorli, G;Rolandi, G;
2019

Abstract

Signals consistent with the B_c^+(2S) and B_c^*+(2S) states are observed in proton-proton collisions at sqrt[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 ¯]c states are observed in the B_c^+π^+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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/79143
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 89
  • ???jsp.display-item.citation.isi??? 45
social impact