We search for annihilation decay modes of neutral b mesons into pairs of charmless charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 6fb -1 of integrated luminosity, we obtain the first evidence for the Bs0→π +π - decay, with a significance of 3.7σ, and a measured branching ratio B(Bs0→π +π -)=(0.57±0.15(stat) ±0.10(syst))×10 -6. A search for the B0→K +K - mode in the same sample yields a significance of 2.0σ, and a central value estimate B(B0→K +K -)=(0.23±0.10(stat)±0.10(syst))×10 -6.

Evidence for the Charmless Annihilation Decay Mode B-s(0) -> pi(+)pi(-)

MANCA, GIULIA;
2012-01-01

Abstract

We search for annihilation decay modes of neutral b mesons into pairs of charmless charged hadrons with the upgraded Collider Detector at the Fermilab Tevatron. Using a data sample corresponding to 6fb -1 of integrated luminosity, we obtain the first evidence for the Bs0→π +π - decay, with a significance of 3.7σ, and a measured branching ratio B(Bs0→π +π -)=(0.57±0.15(stat) ±0.10(syst))×10 -6. A search for the B0→K +K - mode in the same sample yields a significance of 2.0σ, and a central value estimate B(B0→K +K -)=(0.23±0.10(stat)±0.10(syst))×10 -6.
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/11584/65583
 Attenzione

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

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 39
  • ???jsp.display-item.citation.isi??? 36
social impact