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Journal Article

Study of the lineshape of the χc1(3872) state


Schmelling,  M.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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LHCb Collaboration, Aaij, R., Abellan Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., et al. (2020). Study of the lineshape of the χc1(3872) state. Physical Review D, 102(9): 092005. doi:10.1103/PhysRevD.102.092005.

Cite as: https://hdl.handle.net/21.11116/0000-0008-2ADD-1
A study of the lineshape of the chi(c1) (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 chi(c1)(3872) and psi(2S) mesons from b-hadron decays are selected in the J/psi pi(+)pi(-) decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the chi(c1 )(3872) and psi(2S) states, Delta m, and the width of the chi(c1 )(3872) state, Gamma(Bw), are determined to be (Delta m=185.598 +/- 0.067 +/- 0.068 Mev,)(Gamma BW=1.39 +/- 0.24 +/- 0.10 Mev,) where the first uncertainty is statistical and the second systematic. Using a Flatte-inspired model, the mode and full width at half maximum of the lineshape are determined to be (mode=3871.69+0.00+0.05 MeV.)(FWHM=0.22-0.04+0.13+0.07+0.11-0.06-0.13 MeV, ) An investigation of the analytic structure of the Flatte amplitude reveals a pole structure, which is compatible with a quasibound D-0(D) over bar*(0) state but a quasivirtual state is still allowed at the level of 2 standard deviations.