A New Measurement Of The Xi(+)(C) Lifetime

Jm Link,M Reyes,Pm Yager,Jc Anjos, I Bediaga, C Gobel,J Magnin, A Massafferri,Jm De Miranda,Im Pepe,Ac Dos Reis, S Carrillo, E Casimiro, A Sanchez-Hernandez,C Uribe,F Vazquez, L Cinquini,Jp Cumalat, B O'Reilly,Je Ramirez,Ew Vaandering,Jn Butler,Hwk Cheung, I Gaines,Ph Garbincius,La Garren, E Gottschalk,Ph Kasper,Ae Kreymer, R Kutschke, S Bianco,Fl Fabbri, A Zallo, C Cawlfield,Dy Kim, A Rahimi, J Wiss, R Gardner, A Kryermadhi,Ys Chung,Js Kang,Br Ko,Jw Kwak,Kb Lee,H Park, G Alimonti,M Boschini, G Chiodini, P D'Angelo, M Dicorato, P Dini, M Giammarchi, P Inzani, F Leveraro,S Malvezzi, D Menasce, M Mezzadri, L Milazzo, L Moroni, D Pedrini, C Pontoglio, F Prelz,M Rovere, S Sala,Tf Davenport, L Agostino, V Arena, G Boca, G Bonomi, G Gianini, G Liguori,Mm Merlo, D Pantea,Sp Ratti, C Riccardi, I Segoni,P Vitulo,H Hernandez,Am Lopez, H Mendez, L Mendez, A Mirles, E Montiel, D Olaya, A Paris, J Quinones,C Rivera, W Xiong, Y Zhang,Jr Wilson, K Cho, T Handler, R Mitchell, D Engh, M Hosack,We Johns, M Nehring,Pd Sheldon, K Stenson, M Webster, M Sheaff

PHYSICS LETTERS B（2001）

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摘要

A precise determination of the charm-strange baryon Xi (+)(c) lifetime is presented. The data were accumulated by the Fermilab high-energy photoproduction experiment FOCUS. The measurement is made with 300 Xi (+)(c) --> Xi (-)pi (+)pi (+) decays, 130 Xi (+)(c) --> Sigma (+)K(-)pi (+) decays, 45 Xi (+)(c) --> pK(-)pi (+) decays and 58 Xi (+)(c) --> Lambda (0)K(-)pi (+)pi (+) decays. The Xi (+)(c) lifetime is measured to be 0.439 +/- 0.022 +/- 0.009 ps. (C) 2001 Elsevier Science B.V. All rights reserved.

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