Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays B0 s→D+ s+Xμν̄ ; B0 s→D0K+Xμν̄ are detected. Two structures are observed in the D0K+ mass spectrum at masses consistent with the known Ds1(2536)+ ; Ds2*(2573)+ mesons. The measured branching fractions relative to the total B-s0 semileptonic rate are B(B0 s→Ds2*+Xμν̄)/B(B0 s→Xμν̄)=(3.3±1.0±0.4)%, ; B(B0 s→D+ s1Xμν̄)/B(B0 s→Xμν̄)=(5.4±1.2±0.5)%, where the first uncertainty is statistical ; the second is systematic. This is the first observation of the D*+ s2 state in B0 s decays; we also measure its mass ; width. © 2011 CERN.

First observation of B0 s→D*s2+Xμν̄- decays

PAPPAGALLO, MARCO IGNAZIO;
2011-01-01

Abstract

Using data collected with the LHCb detector in proton-proton collisions at a centre-of-mass energy of 7 TeV, the semileptonic decays B0 s→D+ s+Xμν̄ ; B0 s→D0K+Xμν̄ are detected. Two structures are observed in the D0K+ mass spectrum at masses consistent with the known Ds1(2536)+ ; Ds2*(2573)+ mesons. The measured branching fractions relative to the total B-s0 semileptonic rate are B(B0 s→Ds2*+Xμν̄)/B(B0 s→Xμν̄)=(3.3±1.0±0.4)%, ; B(B0 s→D+ s1Xμν̄)/B(B0 s→Xμν̄)=(5.4±1.2±0.5)%, where the first uncertainty is statistical ; the second is systematic. This is the first observation of the D*+ s2 state in B0 s decays; we also measure its mass ; width. © 2011 CERN.
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/11586/179842
 Attenzione

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

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 34
  • ???jsp.display-item.citation.isi??? 31
social impact