Structure of the decay anti-B0s → J/ψ π+ π− 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 π+ π− states are required to describe the decay: f0(980), f0(1500), f0(1790), f2(1270), and f2′(1525). An alternative model including these states and a nonresonant J/ψ π+ π− 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 f0(500) state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the f0(980) of < 7.7° at a 90% confidence level, consistent with a tetraquark interpretation of the f0(980) substructure.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. (2014). Measurement of Resonant and CP Components in anti-B0s → J/ψ π+ π− Decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89(9), 1-21 [10.1103/PhysRevD.89.092006].

Measurement of Resonant and CP Components in anti-B0s → J/ψ π+ π− Decays

CARBONE, ANGELO;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2014

Abstract

Structure of the decay anti-B0s → J/ψ π+ π− 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 π+ π− states are required to describe the decay: f0(980), f0(1500), f0(1790), f2(1270), and f2′(1525). An alternative model including these states and a nonresonant J/ψ π+ π− 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 f0(500) state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the f0(980) of < 7.7° at a 90% confidence level, consistent with a tetraquark interpretation of the f0(980) substructure.
2014
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. (2014). Measurement of Resonant and CP Components in anti-B0s → J/ψ π+ π− Decays. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 89(9), 1-21 [10.1103/PhysRevD.89.092006].
R. Aaij; B. Adeva; M. Adinolfi; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; P. Alvarez Cartelle; A.A. Alves...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/285313
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