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