Model-Independent Observation of Exotic Contributions to B degrees -> J/psi K+pi(-) Decays

Aaij, R. and Abellan, Beteta C. and Adeva, B. and Adinolfi, M. and Aidala, C. A. and Dey, Biplab (2019) Model-Independent Observation of Exotic Contributions to B degrees -> J/psi K+pi(-) Decays. PHYSICAL REVIEW LETTERS, 122 (15). ISSN 0031-9007

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Abstract

An angular analysis of B degrees -> J/psi K+pi(-) decays is performed, using proton-proton collision data corresponding to an integrated luminosity of 3 fb(-1) collected with the LHCb detector. The m(K+pi(-) ) spectrum is divided into fine bins. In each m(K+pi(-)) bin, the hypothesis that the three-dimensional angular distribution can be described by structures induced only by K* resonances is examined, making minimal assumptions about the K+pi(-) system. The data reject the K*-only hypothesis with a large significance, implying the observation of exotic contributions in a model-independent fashion. Inspection of the m(J/psi pi(-)) vs m(K+pi(-)) plane suggests structures near m(J/psi pi(-)) = 4200 and 4600 MeV.

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