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Title: Study of the lineshape of the chi(c1) (3872) state
Author: Alfonso Albero, Alejandro
Calvo Gómez, Míriam
Camboni, Alessandro
Coquereau, Samuel
García Moreno, P.
Garrido Beltrán, Lluís
Gascón Fora, David
Gironella Gironell, Pere
Golobardes, Elisabet
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Manera Escalero, R.
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Gran Col·lisionador d'Hadrons
Mesons (Física nuclear)
Large Hadron Collider (France and Switzerland)
Mesons (Nuclear physics)
Issue Date: 12-Nov-2020
Publisher: American Physical Society
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 D0¯D*0 state but a quasivirtual state is still allowed at the level of 2 standard deviations.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2020, vol. 102, num. 9, p. 092005
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ISSN: 2470-0010
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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