Phys. Rev. Lett.
86,
2232–2236
(2001)
Measurement of the Λc+ Lifetime
A. H. Mahmood et al. (CLEO Collaboration)
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A. H. Mahmood1, S. E. Csorna2, I. Danko2, K. W. McLean2, Sz. Márka2, Z. Xu2, R. Godang3, K. Kinoshita3,*, I. C. Lai3, S. Schrenk3, G. Bonvicini4, D. Cinabro4, S. McGee4, L. P. Perera4, G. J. Zhou4, E. Lipeles5, S. P. Pappas5, M. Schmidtler5, A. Shapiro5, W. M. Sun5, A. J. Weinstein5, F. Würthwein5,†, D. E. Jaffe6, G. Masek6, H. P. Paar6, E. M. Potter6, S. Prell6, V. Sharma6, D. M. Asner7, A. Eppich7, T. S. Hill7, R. J. Morrison7, H. N. Nelson7, R. A. Briere8, G. P. Chen8, B. H. Behrens9, W. T. Ford9, A. Gritsan9, J. Roy9, J. G. Smith9, J. P. Alexander10, R. Baker10, C. Bebek10, B. E. Berger10, K. Berkelman10, F. Blanc10, V. Boisvert10, D. G. Cassel10, M. Dickson10, P. S. Drell10, K. M. Ecklund10, R. Ehrlich10, A. D. Foland10, P. Gaidarev10, R. S. Galik10, L. Gibbons10, B. Gittelman10, S. W. Gray10, D. L. Hartill10, B. K. Heltsley10, P. I. Hopman10, C. D. Jones10, J. Kandaswamy10, D. L. Kreinick10, M. Lohner10, A. Magerkurth10, T. O. Meyer10, N. B. Mistry10, E. Nordberg10, J. R. Patterson10, D. Peterson10, D. Riley10, J. G. Thayer10, D. Urner10, B. Valant-Spaight10, A. Warburton10, P. Avery11, C. Prescott11, A. I. Rubiera11, J. Yelton11, J. Zheng11, G. Brandenburg12, A. Ershov12, Y. S. Gao12, D. Y.-J. Kim12, R. Wilson12, T. E. Browder13, Y. Li13, J. L. Rodriguez13, H. Yamamoto13, T. Bergfeld14, B. I. Eisenstein14, J. Ernst14, G. E. Gladding14, G. D. Gollin14, R. M. Hans14, E. Johnson14, I. Karliner14, M. A. Marsh14, M. Palmer14, C. Plager14, C. Sedlack14, M. Selen14, J. J. Thaler14, J. Williams14, K. W. Edwards15a,15b, R. Janicek16a,16b, P. M. Patel16a,16b, A. J. Sadoff17, R. Ammar18, A. Bean18, D. Besson18, R. Davis18, N. Kwak18, X. Zhao18, S. Anderson19, V. V. Frolov19, Y. Kubota19, S. J. Lee19, R. Mahapatra19, J. J. O'Neill19, R. Poling19, T. Riehle19, A. Smith19, C. J. Stepaniak19, J. Urheim19, S. Ahmed20, M. S. Alam20, S. B. Athar20, L. Jian20, L. Ling20, M. Saleem20, S. Timm20, F. Wappler20, A. Anastassov21, J. E. Duboscq21, E. Eckhart21, K. K. Gan21, C. Gwon21, T. Hart21, K. Honscheid21, D. Hufnagel21, H. Kagan21, R. Kass21, T. K. Pedlar21, H. Schwarthoff21, J. B. Thayer21, E. von Toerne21, M. M. Zoeller21, S. J. Richichi22, H. Severini22, P. Skubic22, A. Undrus22, S. Chen23, J. Fast23, J. W. Hinson23, J. Lee23, D. H. Miller23, E. I. Shibata23, I. P. J. Shipsey23, V. Pavlunin23, D. Cronin-Hennessy24, A. L. Lyon24, E. H. Thorndike24, C. P. Jessop25, H. Marsiske25, M. L. Perl25, V. Savinov25, X. Zhou25, T. E. Coan26, V. Fadeyev26, Y. Maravin26, I. Narsky26, R. Stroynowski26, J. Ye26, T. Wlodek26, M. Artuso27, R. Ayad27, C. Boulahouache27, K. Bukin27, E. Dambasuren27, S. Karamov27, G. Majumder27, G. C. Moneti27, R. Mountain27, S. Schuh27, T. Skwarnicki27, S. Stone27, G. Viehhauser27, J. C. Wang27, A. Wolf27, J. Wu27, and S. Kopp28 (CLEO Collaboration)
1University of Texas–Pan American, Edinburg, Texas 78539
2Vanderbilt University, Nashville, Tennessee 37235
3Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
4Wayne State University, Detroit, Michigan 48202
5California Institute of Technology, Pasadena, California 91125
6University of California, San Diego, La Jolla, California 92093
7University of California, Santa Barbara, California 93106
8Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
9University of Colorado, Boulder, Colorado 80309-0390
10Cornell University, Ithanca, New York 14853
11University of Florida, Gainesville, Florida 32611
12Harvard University, Cambridge, Massachusetts 02138
13University of Hawaii at Manoa, Honolulu, Hawaii 96822
14University of Illinois, Urbana-Champaign, Illinois 61801
15aCarleton University, Ottawa, Ontario, Canada K1S 5B6
15band the Institute of Particle Physics, Canada
16aMcGill University, Montréal, Québec, Canada H3A 2T8
16band the Institute of Particle Physics, Canada
17Ithaca College, Ithaca, New York 14850
18University of Kansas, Lawrence, Kansas 66045
19University of Minnesota, Minneapolis, Minnesota 55455
20State University of New York at Albany, Albany, New York 12222
21Ohio State University, Columbus, Ohio 43210
22University of Oklahoma, Norman, Oklahoma 73019
23Purdue University, West Lafayette, Indiana 47907
24University of Rochester, Rochester, New York 14627
25Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309
26Southern Methodist University, Dallas, Texas 75275
27Syracuse University, Syracuse, New York 13244
28University of Texas, Austin, Texas 78712
Received 15 November 2000; published in the issue dated 12 March 2001
The Λc+ lifetime is measured using 9.0fb-1 of e+e- annihilation data collected on or just below the ϒ(4S) resonance with the CLEO II.V detector at CESR. Using an unbinned maximum likelihood fit, the Λc+ lifetime is measured to be 179.6±6.9(stat)±4.4(syst)fs. The precision of this colliding beam measurement is comparable to other measurements, which are based on fixed-target experiments, with different systematic uncertainties.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.2232
DOI:
10.1103/PhysRevLett.86.2232
*Permanent address: University of Cincinnati, Cincinnati, OH 45221. †Permanent address: Massachusetts Institute of Technology, Cambridge, MA 02139.
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