Using a data sample corresponding to an integrated luminosity of 10.9 fb(-1) collected at center-of-mass energies from 4.16 to 4.34 GeV with the BESIII detector, we search for the decay chi(c1) (3872) -> pi(+)pi(-)chi(c1) in the radiative production e(+)e(-) -> gamma chi(c1) (3872). No significant signal is observed, and the ratio for the branching fraction of chi(c1) (3872) -> pi(+)pi(-)chi(c1) to chi(c1) (3872) -> pi(+)pi(-)J/psi is measured as R equivalent to B[chi(c1)(3872)->pi(+)pi(-)chi(c1)]/B[chi(c1)(3872)->pi(+)pi(-)J/psi] < 0.18 at 90% confidence level. An upper limit on the product of the cross section sigma[e(+)e(-) -> gamma chi(c1) (3872)] and the branching fraction B[chi(c1)(3872)->pi(+)pi(-)chi(c1)] at each center-of-mass energy is also given. These measurements favor the nonconventional charmonium nature of the chi(c1)(3872) state.
Search for the decay χc1 (3872) →π+π-χc1
Amoroso, A.;Bianchi, F.;Destefanis, M.;De Mori, F.;Greco, M.;Maggiora, M.;Marcello, S.;Sosio, S.;Spataro, S.;
2024-01-01
Abstract
Using a data sample corresponding to an integrated luminosity of 10.9 fb(-1) collected at center-of-mass energies from 4.16 to 4.34 GeV with the BESIII detector, we search for the decay chi(c1) (3872) -> pi(+)pi(-)chi(c1) in the radiative production e(+)e(-) -> gamma chi(c1) (3872). No significant signal is observed, and the ratio for the branching fraction of chi(c1) (3872) -> pi(+)pi(-)chi(c1) to chi(c1) (3872) -> pi(+)pi(-)J/psi is measured as R equivalent to B[chi(c1)(3872)->pi(+)pi(-)chi(c1)]/B[chi(c1)(3872)->pi(+)pi(-)J/psi] < 0.18 at 90% confidence level. An upper limit on the product of the cross section sigma[e(+)e(-) -> gamma chi(c1) (3872)] and the branching fraction B[chi(c1)(3872)->pi(+)pi(-)chi(c1)] at each center-of-mass energy is also given. These measurements favor the nonconventional charmonium nature of the chi(c1)(3872) state.File | Dimensione | Formato | |
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PhysRevD.109.L071101.pdf
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