The decay width and mass of the D(s1)(2536)(+) meson are measured via the decay channel D(s1)(+) -> D(*+)K(S)(0) using 385 fb(-1) of data recorded with the BABAR detector in the vicinity of the Gamma(4S) resonance at the PEP-II asymmetric-energy electron-positron collider. The result for the decay width is Gamma(D(s1)(+)) = 92 +/- 0.03(stat.) +/- 0.04(syst.) MeV. For the mass a value of m(D(s1)(+)) = 2535.08 +/- 0.01(stat.) +/- 0.15(syst.) MeV/c(2) is obtained. The mass difference between the D(s1)(+) and the D(*+) is measured to be m(D(s1)(+)) - m(D(*+)) = 524.83 +/- 0.01(stat.) +/- 0.04(syst.) MeV/c(2) representing a significant improvement compared to the current world average. The unnatural spin-parity assignment for the D(s1)(+) meson is confirmed.
Measurement of the mass and width of the D(s1)(2536)(+) meson
BETTONI, Diego;BOZZI, Concezio;CALABRESE, Roberto;CIBINETTO, Gianluigi;FIORAVANTI, Elisa;GARZIA, Isabella;LUPPI, Eleonora;MUNERATO, Mauro;NEGRINI, Matteo;PIEMONTESE, Livio;
2011
Abstract
The decay width and mass of the D(s1)(2536)(+) meson are measured via the decay channel D(s1)(+) -> D(*+)K(S)(0) using 385 fb(-1) of data recorded with the BABAR detector in the vicinity of the Gamma(4S) resonance at the PEP-II asymmetric-energy electron-positron collider. The result for the decay width is Gamma(D(s1)(+)) = 92 +/- 0.03(stat.) +/- 0.04(syst.) MeV. For the mass a value of m(D(s1)(+)) = 2535.08 +/- 0.01(stat.) +/- 0.15(syst.) MeV/c(2) is obtained. The mass difference between the D(s1)(+) and the D(*+) is measured to be m(D(s1)(+)) - m(D(*+)) = 524.83 +/- 0.01(stat.) +/- 0.04(syst.) MeV/c(2) representing a significant improvement compared to the current world average. The unnatural spin-parity assignment for the D(s1)(+) meson is confirmed.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
