A study of the lineshape of the χc1(3872) state is made using a data sample corresponding to an integrated luminosity of 3  fb−1 collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate χc1(3872) and ψ(2S) mesons from b-hadron decays are selected in the J/ψπ+π− decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the χc1(3872) and ψ(2S) states, Δm, and the width of the χc1(3872) state, ΓBW, are determined to be Δm=185.598±0.067±0.068  MeV,ΓBW=1.39±0.24±0.10  MeV, where the first uncertainty is statistical and the second systematic. Using a Flatté-inspired model, the mode and full width at half maximum of the lineshape are determined to be mode=3871.69+0.00+0.05−0.04−0.13  MeV,FWHM=0.22+0.07+0.11−0.06−0.13  MeV. An investigation of the analytic structure of the Flatté amplitude reveals a pole structure, which is compatible with a quasibound D0a¯D*0 state but a quasivirtual state is still allowed at the level of 2 standard deviations.

Study of the lineshape of the χc1 (3872) state / 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., Alves, A.A., Amato, S., Amhis, Y., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0029. - 102:9(2020). [10.1103/PhysRevD.102.092005]

Study of the lineshape of the χc1 (3872) state

Capriotti, L.;Sarti, A.;Sciubba, A.;
2020

Abstract

A study of the lineshape of the χc1(3872) state is made using a data sample corresponding to an integrated luminosity of 3  fb−1 collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate χc1(3872) and ψ(2S) mesons from b-hadron decays are selected in the J/ψπ+π− decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the χc1(3872) and ψ(2S) states, Δm, and the width of the χc1(3872) state, ΓBW, are determined to be Δm=185.598±0.067±0.068  MeV,ΓBW=1.39±0.24±0.10  MeV, where the first uncertainty is statistical and the second systematic. Using a Flatté-inspired model, the mode and full width at half maximum of the lineshape are determined to be mode=3871.69+0.00+0.05−0.04−0.13  MeV,FWHM=0.22+0.07+0.11−0.06−0.13  MeV. An investigation of the analytic structure of the Flatté amplitude reveals a pole structure, which is compatible with a quasibound D0a¯D*0 state but a quasivirtual state is still allowed at the level of 2 standard deviations.
2020
Charm physics; Hadron-Hadron scattering (experiments); QCD; spectroscopy
01 Pubblicazione su rivista::01a Articolo in rivista
Study of the lineshape of the χc1 (3872) state / 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., Alves, A.A., Amato, S., Amhis, Y., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0029. - 102:9(2020). [10.1103/PhysRevD.102.092005]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1580084
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