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cc by (c) CERN; LHCb Collaboration, 2013
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/131833

Amplitude analysis and branching fraction measurement of B¯s0→J/ψK+K-

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An amplitude analysis of the final state structure in the ¯¯¯ B 0 s → J / ψ K + K − decay mode is performed using 1.0     fb − 1 of data collected by the LHCb experiment in 7 TeV center-of-mass energy p p collisions produced by the LHC. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra and the decay angular distributions. Resonant structures are observed in the K + K − mass spectrum as well as a significant nonresonant S -wave contribution over the entire K + K − mass range. The largest resonant component is the ϕ ( 1020 ) , accompanied by f 0 ( 980 ) , f ′ 2 ( 1525 ) , and four additional resonances. The overall branching fraction is measured to be B ( ¯¯¯ B 0 s → J / ψ K + K − ) = ( 7.70 ± 0.08 ± 0.39 ± 0.60 ) × 10 − 4 , where the first uncertainty is statistical, the second systematic, and the third due to the ratio of the number of ¯¯¯ B 0 s to B − mesons produced. The mass and width of the f ′ 2 ( 1525 ) are measured to be 1522.2 ± 2.8 + 5.3 − 2.0     MeV and 84 ± 6 + 10 − 5     MeV , respectively. The final state fractions of the other resonant states are also reported.

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CAMBONI, Alessandro, COMERMA MONTELLS, Albert, GARRIDO BELTRÁN, Lluís, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, LÓPEZ ASAMAR, Elias, PÉREZ-CALERO YZQUIERDO, Antonio, PICATOSTE OLLOQUI, Eduardo, POTTERAT, Cédric, RIVES MOLINA, Vicente josé, RUIZ, Hugo (ruiz pérez), VÁZQUEZ GÓMEZ, Ricard, ABELLAN BETETA, Carlos, CALVO GÓMEZ, Míriam, VILASIS-CARDONA, Xavier, DOMINGO BONAL, Francesc, LHCb Collaboration. Amplitude analysis and branching fraction measurement of B¯s0→J/ψK+K-. _Physical Review D_. 2013. Vol. 87, núm. 7, pàgs. 072004. [consulta: 1 de febrer de 2026]. ISSN: 1550-7998. [Disponible a: https://hdl.handle.net/2445/131833]

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