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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/174899
Study of the lineshape of the chi(c1) (3872) state
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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.
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ALFONSO ALBERO, Alejandro, CALVO GÓMEZ, Míriam, CAMBONI, Alessandro, COQUEREAU, Samuel, GARCÍA MORENO, Paula, 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. Study of the lineshape of the chi(c1) (3872) state. _Physical Review D_. 2020. Vol. 102, núm. 9, pàgs. 092005. [consulta: 21 de gener de 2026]. ISSN: 2470-0010. [Disponible a: https://hdl.handle.net/2445/174899]