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Mass and lifetime measurements of bottom and charm baryons in p(p)over-bar collisions at pffisffi root s=1.96 TeV

Journal article published in 2014 by T. Aaltonen, S. Ameriob, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, Ja A. Appel, T. Arisawa, A. Artikov, J. Asaadi, W. Ashmanskas, B. Auerbach, A. Aurisano, F. Azfar and other authors.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.

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Abstract

We report on mass and lifetime measurements of several ground state charmed and bottom baryons, using a data sample corresponding to 9.6 fb(-1) from p (p) over bar collisions at pffisffiffi root s = 1.96 TeV and recorded with the Collider Detector at Fermilab. Baryon candidates are reconstructed from data collected with an online event selection designed for the collection of long-lifetime heavy-flavor decay products and a second event selection designed to collect J/psi -> mu(+)mu(-) candidates. First evidence for the process Omega(-)(b) -> Omega(0)(c)pi(-) is presented with a significance of 3.3 sigma. We measure the following baryon masses: M(Xi(0)(c)) = 2470.85 +/- 0.24(stat) +/- 0.55(syst) MeV/c(2); M(Xi(+)(c)) = 2468.00 +/- 0.18(stat) +/- 0.51(syst) MeV/c(2); M(Lambda(b)) = 5620.15 +/- 0.31(stat) +/- 0.47(syst) MeV/c(2); M(Xi(-)(b)) = 5793.4 +/- 1.8(stat) +/- 0.7(syst) MeV/c(2); M(Xi(0)(b)) = 5788.7 +/- 4.3(stat) +/- 1.4(syst) MeV/c(2); and M(Omega(-)(b)) = 6047.5 +/- 3.8(stat) +/- 0.6(syst) MeV/c(2): The isospin splitting of the Xi(-0)(b) states is found to be M(Xi(-)(b)) - M(Xi(0)(b)) = 4.7 +/- 4.7(stat) +/- 0.7(syst)MeV/c(2). The isospin splitting of the Xi(0,vertical bar)(c) states is found to be M(Xi(0)(c)) - M(Xi(0)(c)) = 2.85 +/- 0.30(stat) +/- 0.04(syst) MeV/c(2). The following lifetime measurements are made: tau(Lambda(b)) = 1.565 +/- 0.035(stat) +/- 0.020(syst) ps; tau(Xi(-)(b)) = 1.32 +/- 0.14(stat) +/- 0.02(syst) ps; tau(Omega(-)(b)) = 1.66(-0.40)(+0.53)(stat) +/- 0.02(syst) ps: