The first observation of exotic states with a new quark content ccu¯ s¯ decaying to the J=ψKþ final state is reported with high significance from an amplitude analysis of the Bþ → J=ψϕKþ decay. The analysis is carried out using proton-proton collision data corresponding to a total integrated luminosity of 9 fb−1 collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The most significant state, Zcsð4000Þþ, has a mass of 4003 6þ4 −14 MeV, a width of 131 15 26 MeV, and spin parity JP ¼ 1þ, where the quoted uncertainties are statistical and systematic, respectively. A new 1þ Xð4685Þ state decaying to the J=ψϕ final state is also observed with high significance. In addition, the four previously reported J=ψϕ states are confirmed and two more exotic states, Zcsð4220Þþ and Xð4630Þ, are observed with significance exceeding 5 standard deviations.

Observation of new resonances decaying to J /ψK+ and J /ψφ / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 127:8(2021). [10.1103/PhysRevLett.127.082001]

Observation of new resonances decaying to J /ψK+ and J /ψφ

Capriotti, L.;Casse, G.;Sarti, A.;
2021

Abstract

The first observation of exotic states with a new quark content ccu¯ s¯ decaying to the J=ψKþ final state is reported with high significance from an amplitude analysis of the Bþ → J=ψϕKþ decay. The analysis is carried out using proton-proton collision data corresponding to a total integrated luminosity of 9 fb−1 collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. The most significant state, Zcsð4000Þþ, has a mass of 4003 6þ4 −14 MeV, a width of 131 15 26 MeV, and spin parity JP ¼ 1þ, where the quoted uncertainties are statistical and systematic, respectively. A new 1þ Xð4685Þ state decaying to the J=ψϕ final state is also observed with high significance. In addition, the four previously reported J=ψϕ states are confirmed and two more exotic states, Zcsð4220Þþ and Xð4630Þ, are observed with significance exceeding 5 standard deviations.
2021
Charm physics; Hadron-Hadron scattering (experiments); QCD; spectroscopy
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of new resonances decaying to J /ψK+ and J /ψφ / Aaij, R., Abellán Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C.A., Aiola, S., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alkhazov, G., Alvarez Cartelle, P., Amato, S., Amhis, Y., An, L., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 127:8(2021). [10.1103/PhysRevLett.127.082001]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1579548
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