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Measurement of resonant and CP components in (B)over-bar(s)(0) -> J/psi pi(+)pi(-) decays

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Measurement of resonant and CP components in (B)over-bar(s)(0) -> J/psi pi(+)pi(-) decays

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LHCb Collaboration; Martínez Vidal, Fernando; Oyanguren Campos, Arantza; Ruiz Valls, Pablo

Aquest document és un/a article, creat/da en: 2014

Structure of the decay _ B0s. J=.p_p- is studied using data corresponding to 3 fb- 1 of integrated luminosity from pp collisions produced by the LHC and collected by the LHCb detector. Five interfering p_p- states are required to describe the decay: F-0(980), F-0(1500), F-0(1790), F-2 (1270) and F-2(1525) An alternative model including these states and a nonresonant J=.p_p- component also provides a good description of the data. Based on the different transversity components measured for the spin- 2 intermediate states, the final state is found to be compatible with being entirely CP odd. The CP- even part is found to be < 2.3% at a 95% confidence level. The f 0d500_ state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the f 0d980_ of < 7.7 at a 90% confidence level, consistent with a tetraquark interpretation of the f(0)(980) substructure.

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