We report the observation and measurement of the mass of the bottom, strange baryon Xi(-)(b) through the decay chain Xi(-)(b)-->J/psi Xi(-), where J/psi-->mu(+)mu(-), Xi(-)-->Lambda pi(-), and Lambda-->p pi(-). A signal is observed whose probability of arising from a background fluctuation is 6.6 x 10(-15), or 7.7 Gaussian standard deviations. The Xi(-)(b) mass is measured to be 5792.9 +/- 2.5(stat) +/- 1.7(syst) MeV/c(2).

Observation and mass measurement of the baryon Xi(-)(b) / Aaltonen, T., Abulencia, A., Adelman, J., Affolder, T., Akimoto, T., Albrow, M.g., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., Aurisano, A., Azfar, F., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 99:5(2007), pp. 052002-1-052002-7. [10.1103/physrevlett.99.052002]

Observation and mass measurement of the baryon Xi(-)(b)

DE CECCO, Sandro;DIONISI, Carlo;GIAGU, Stefano;MARGAROLI, Fabrizio;IORI, Maurizio;MESSINA, Andrea;SORRENTINO, Lucia;
2007

Abstract

We report the observation and measurement of the mass of the bottom, strange baryon Xi(-)(b) through the decay chain Xi(-)(b)-->J/psi Xi(-), where J/psi-->mu(+)mu(-), Xi(-)-->Lambda pi(-), and Lambda-->p pi(-). A signal is observed whose probability of arising from a background fluctuation is 6.6 x 10(-15), or 7.7 Gaussian standard deviations. The Xi(-)(b) mass is measured to be 5792.9 +/- 2.5(stat) +/- 1.7(syst) MeV/c(2).
2007
01 Pubblicazione su rivista::01a Articolo in rivista
Observation and mass measurement of the baryon Xi(-)(b) / Aaltonen, T., Abulencia, A., Adelman, J., Affolder, T., Akimoto, T., Albrow, M.g., Amerio, S., Amidei, D., Anastassov, A., Anikeev, K., Annovi, A., Antos, J., Aoki, M., Apollinari, G., Arisawa, T., Artikov, A., Ashmanskas, W., Attal, A., Aurisano, A., Azfar, F., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 99:5(2007), pp. 052002-1-052002-7. [10.1103/physrevlett.99.052002]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/358097
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