First observations of the decays Λ<inf>b</inf> <sup>0</sup>→ Λ<inf>c</inf> <sup>+</sup>D<inf>(s)</inf> <sup>-</sup>are reported using data corresponding to an integrated luminosity of 3fb<sup>-1</sup>collected at 7 and 8 TeV center-of-mass energies in proton-proton collisions with the LHCb detector. In addition, the most precise measurement of the branching fraction B(B<inf>s</inf> <sup>0</sup>→D<sup>+</sup>D<inf>s</inf> <sup>-</sup>) is made and a search is performed for the decays B<inf>(s)</inf> <sup>0</sup>→Λ<inf>c</inf> <sup>+</sup>Λ<inf>c</inf> <sup>-</sup>. The results obtained are B(Λ<inf>b</inf> <sup>0</sup>→Λ<inf>c</inf> <sup>+</sup>D<sup>-</sup>)/ B(Λ<inf>b</inf> <sup>0</sup>→Λ<inf>c</inf> <sup>+</sup>D<inf>s</inf> <sup>-</sup>)=0.042±0.003(stat)±0.003(syst), [B(Λ<inf>b</inf> <sup>0</sup>→Λ<inf>c</inf> <sup>+</sup>D<inf>s</inf> <sup>-</sup>)/B(B̄<sup>0</sup>→D<sup>+</sup>D<inf>s</inf> <sup>-</sup>)]/[B(Λ<inf>b</inf> <sup>0</sup>→Λ<inf>c</inf> <sup>+</sup>π<sup>-</sup>)/B(B̄<sup>0</sup>→D<sup>+</sup>π<sup>-</sup>)]=0.96±0.02(stat)±0.06(syst),B(B<inf>s</inf> <sup>0</sup>→D<sup>+</sup>D<inf>s</inf> <sup>-</sup>)/ B(B̄<sup>0</sup>→D<sup>+</sup>D<inf>s</inf> <sup>-</sup>)=0. 038±0.004(stat)±0.003(syst),B(B̄<sup>0</sup>→Λ<inf>c</inf> <sup>+</sup>Λ<inf>c</inf> <sup>-</sup>)/B(B̄<sup>0</sup>→D<sup>+</sup>D<inf>s</inf> <sup>-</sup>)<0.0022[95%C.L.], B(B<inf>s</inf> <sup>0</sup>→Λ<inf>c</inf> <sup>+</sup>Λ<inf>c</inf> <sup>-</sup>)/B(B<inf>s</inf> <sup>0</sup>→D<sup>+</sup>D<inf>s</inf> <sup>-</sup>)<0.30[95%C.L.]. Measurement of the mass of the Λ<inf>b</inf> <sup>0</sup>baryon relative to the B̄<sup>0</sup>meson gives M(Λ<inf>b</inf> <sup>0</sup>)-M(B̄<sup>0</sup>)=339. 72±0.24(stat)±0.18(syst)MeV/c<sup>2</sup>. This result provides the most precise measurement of the mass of the Λ<inf>b</inf> <sup>0</sup>baryon to date. © 2014 CERN, for the LHCb Collaboration.

Aaij, R., Abba, A., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., et al. (2014). Study of beauty hadron decays into pairs of charm hadrons. PHYSICAL REVIEW LETTERS, 112(20) [10.1103/PhysRevLett.112.202001].

Study of beauty hadron decays into pairs of charm hadrons

Borsato, M;CALVI, MARTA;CASSINA, LORENZO;GOTTI, CLAUDIO;KHANJI, BASEM;KUCHARCZYK, MARCIN;Martinelli, M;
2014

Abstract

First observations of the decays Λb 0→ Λc +D(s) -are reported using data corresponding to an integrated luminosity of 3fb-1collected at 7 and 8 TeV center-of-mass energies in proton-proton collisions with the LHCb detector. In addition, the most precise measurement of the branching fraction B(Bs 0→D+Ds -) is made and a search is performed for the decays B(s) 0→Λc +Λc -. The results obtained are B(Λb 0→Λc +D-)/ B(Λb 0→Λc +Ds -)=0.042±0.003(stat)±0.003(syst), [B(Λb 0→Λc +Ds -)/B(B̄0→D+Ds -)]/[B(Λb 0→Λc +π-)/B(B̄0→D+π-)]=0.96±0.02(stat)±0.06(syst),B(Bs 0→D+Ds -)/ B(B̄0→D+Ds -)=0. 038±0.004(stat)±0.003(syst),B(B̄0→Λc +Λc -)/B(B̄0→D+Ds -)<0.0022[95%C.L.], B(Bs 0→Λc +Λc -)/B(Bs 0→D+Ds -)<0.30[95%C.L.]. Measurement of the mass of the Λb 0baryon relative to the B̄0meson gives M(Λb 0)-M(B̄0)=339. 72±0.24(stat)±0.18(syst)MeV/c2. This result provides the most precise measurement of the mass of the Λb 0baryon to date. © 2014 CERN, for the LHCb Collaboration.
Articolo in rivista - Articolo scientifico
Physics and Astronomy (all)
English
2014
112
20
202001
none
Aaij, R., Abba, A., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., et al. (2014). Study of beauty hadron decays into pairs of charm hadrons. PHYSICAL REVIEW LETTERS, 112(20) [10.1103/PhysRevLett.112.202001].
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/10281/89023
Citazioni
  • Scopus 40
  • ???jsp.display-item.citation.isi??? 29
Social impact