Resonant structures in B0 → ψ′ π− K+ decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3 fb^−1 collected with the LHCb detector. The data cannot be described with K+ π− resonances alone, which is confirmed with a model-independent approach. A highly significant Z(4430)− → ψ′ π− component is required, thus confirming the existence of this state. The observed evolution of the Z(4430)− amplitude with the ψ′ π− mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin parity is determined unambiguously to be 1+.

R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. (2014). Observation of the Resonant Character of the Z(4430)− State. PHYSICAL REVIEW LETTERS, 112(22), 1-9 [10.1103/PhysRevLett.112.222002].

Observation of the Resonant Character of the Z(4430)− State

CARBONE, ANGELO;GALLI, DOMENICO;MOGGI, NICCOLO';MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2014

Abstract

Resonant structures in B0 → ψ′ π− K+ decays are analyzed by performing a four-dimensional fit of the decay amplitude, using pp collision data corresponding to 3 fb^−1 collected with the LHCb detector. The data cannot be described with K+ π− resonances alone, which is confirmed with a model-independent approach. A highly significant Z(4430)− → ψ′ π− component is required, thus confirming the existence of this state. The observed evolution of the Z(4430)− amplitude with the ψ′ π− mass establishes the resonant nature of this particle. The mass and width measurements are substantially improved. The spin parity is determined unambiguously to be 1+.
2014
R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, J. Albrecht, et al. (2014). Observation of the Resonant Character of the Z(4430)− State. PHYSICAL REVIEW LETTERS, 112(22), 1-9 [10.1103/PhysRevLett.112.222002].
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/11585/296314
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