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Observation of theΩb−baryon and measurement of the properties of theΞb−andΩb−baryons

Journal article published in 2009 by T. Aaltonen, J. Adelman, T. Akimoto, B. Álvarez González, S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, A. Apresyan, T. Arisawa, A. Artikov, W. Ashmanskas, A. Attal and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We report the observation of the bottom, doubly-strange baryon Omega(-)(b) through the decay chain Omega(-)(b)-> J/psi Omega(-), where J/psi ->mu(+)mu(-), Omega(-)->Lambda K(-), and Lambda -> p pi(-), using 4.2 fb(-1) of data from p (p) over bar collisions at root s = 1.96 TeV, and recorded with the Collider Detector at Fermilab. A signal is observed whose probability of arising from a background fluctuation is 4.0x10(-8), or 5.5 Gaussian standard deviations. The Omega(-)(b) mass is measured to be (6054.4 +/- 6.8(stat) +/- 0.9(syst)) MeV/c(2). The lifetime of the Omega(-)(b) baryon is measured to be (1.13(-0.40)(+0.53)(stat) +/- 0.02(syst)) ps. In addition, for the Xi(-)(b) baryon we measure a mass of (5790.9 +/- 2.6(stat) +/- 0.8(syst)) MeV/c(2) and a lifetime of (1.56(-0.25)(+0.27)(stat) +/- 0.02(syst)) ps. Under the assumption that the Xi(-)(b) and Omega(-)(b) are produced with similar kinematic distributions to the Lambda(0)(b) baryon, we find (sigma(Xi(-)(b))xB(Xi(-)(b)-> J/psi Xi(-)))/(sigma(Lambda(0)(b))xB(Lambda(0)(b)-> J/psi Lambda)) = 0.167(-0.025)(+0.037)(stat) +/- 0.012(syst) and (sigma(Omega(-)(b))xB(Omega(-)(b)-> J/psi Omega(-)))/(sigma(Lambda(0)(b))xB(Lambda(0)(b)-> J/psi Lambda)) = 0.045(-0.012)(+0.017)(stat) +/- 0.004(syst) for baryons produced with transverse momentum in the range of 6-20 GeV/c.