Szczegóły publikacji
Opis bibliograficzny
First observation of $\bar{B^0} \to J/\psi K^{+}K^{-}$ and search for $\bar{B^0} \to J/\psi\phi$ decays / R. Aaij, [et al.], M. IDZIK, [et al.], B. MURYN, [et al.], A. OBŁĄKOWSKA-MUCHA, [et al.], K. SENDEROWSKA, [et al.], T. SZUMLAK, [et al.] // Physical Review. D, Particles, fields, gravitation, and cosmology ; ISSN 1550-7998. — 2013 — vol. 88 iss. 7, s. 072005-1–072005-15. — Bibliogr. s. 072005-11
Autorzy (1500)
Dane bibliometryczne
| ID BaDAP | 78730 |
|---|---|
| Data dodania do BaDAP | 2014-01-20 |
| Tekst źródłowy | URL |
| DOI | 10.1103/PhysRevD.88.072005 |
| Rok publikacji | 2013 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Physical Review, D |
Abstract
The first observation of the (B) over bar (0) -> J/psi K+K- decay is presented with a data sample corresponding to an integrated luminosity of 1.0 fb(-1) of pp collisions at a center-of-mass energy of 7 TeV collected with the LHCb detector. The branching fraction is measured to be B((B) over bar (0) -> J/psi K+K-) = (2.53 +/- 0.31 +/- 0.19) x 10(-6), where the first uncertainty is statistical and the second is systematic. An amplitude analysis of the final state in the (B) over bar (0) -> J/psi K+K- decay is performed to separate resonant and nonresonant contributions in the K+K- spectrum. Evidence of the a(0)(980) resonance is reported with statistical significance of 3.9 standard deviations. The corresponding product branching fraction is measured to be B((B) over bar (0) -> J/psi a(0)(980), a(0)(980) -> K+K-) = (4.70 +/- 3.31 +/- 0.72) x 10(-7), yielding an upper limit of B((B) over bar (0) -> J/psi a(0)(980), a(0)(980) -> K+K-) < 9.0 x 10(-7) at 90% confidence level. No evidence of the resonant decay <(B)over bar>(0) J/psi phi is found, and an upper limit on its branching fraction is set to be B((B) over bar (0) -> J/psi phi) <1.9 x 10(-7) at 90% confidence level.
