Measurement of B(Lambda(+)(c)-> pK(-)pi(+)) - art. no. 072005

Jaffe, DE Masek, G Paar, HP Potter, EM Prell, S Sharma, V Asner, DM Eppich, A Gronberg, J Hill, TS Lange, DJ Morrison, RJ Briere, RA Behrens, BH Ford, WT Gritsan, A Roy, J Smith, JG Alexander, JP Baker, R Bebek, C Berger, BE Berkelman, K Blanc, F Boisvert, V Cassel, DG Dickson, M Drell, PS Ecklund, KM Ehrlich, R Foland, AD Gaidarev, P Gibbons, L Gittelman, B Gray, SW Hartill, DL Heltsley, BK Hopman, PI Jones, CD Kreinick, DL Lohner, M Magerkurth, A Meyer, TO Mistry, NB Ng, CR Nordberg, E Patterson, JR Peterson, D Riley, D Thayer, JG Thies, PG Valant-Spaight, B Warburton, A Avery, P Prescott, C Rubiera, AI Yelton, J Zheng, J Brandenburg, G Ershov, A Gao, YS Kim, DYJ Wilson, R Browder, TE Li, Y Rodriguez, JL Yamamoto, H Bergfeld, T Eisenstein, BI Ernst, J Gladding, GE Gollin, GD Hans, RM Johnson, E Karliner, I Marsh, MA Palmer, M Plager, C Sedlack, C Selen, M Thaler, JJ Williams, J Edwards, KW Janicek, R Patel, PM Sadoff, AJ Ammar, R Baringer, P Bean, A Besson, D Brabant, P Cervantes, M Kravchenko, I Stutz, RP Zhao, X Anderson, S Frolov, VV Kubota, Y Lee, SJ Mahapatra, R O'Neill, JJ Poling, R Riehle, T Smith, A Urheim, J Ahmed, S Alam, MS Athar, SB Jian, L Ling, L Mahmood, AH Saleem, M Timm, S Wappler, F Anastassov, A Duboscq, JE Gan, KK Gwon, C Hart, T Honscheid, K Hufnagel, D Kagan, H Kass, R Lorenc, J Pedlar, TK Schwarthoff, H von Toerne, E Zoeller, MM Richichi, SJ Severini, H Skubic, P Undrus, A Chen, S Fast, J Hinson, JW Lee, J Menon, N Miller, DH Shibata, EI Shipsey, IPJ Pavlunin, V Cronin-Hennessy, D Kwon, Y Lyon, AL Thorndike, EH Jessop, CP Marsiske, H Perl, ML Savinov, V Ugolini, D Zhou, X Coan, TE Fadeyev, V Korolkov, I Maravin, Y Narsky, I Stroynowski, R Ye, J Wlodek, T Artuso, M Ayad, R Boulahouache, C Bukin, K Dambasuren, E Karamov, S Kopp, S Majumder, G Moneti, GC Mountain, R Schuh, S Skwarnicki, T Stone, S Viehhauser, G Wang, JC Wolf, A Wu, J Csorna, SE Danko, I McLean, KW Marka, S Xu, Z Godang, R Kinoshita, K Lai, IC Schrenk, S Bonvicini, G Cinabro, D Perera, LP Zhou, GJ Eigen, G Lipeles, E Schmidtler, M Shapiro, A Sun, WM Weinstein, AJ Wurthwein, F

De. Jaffe et al., Measurement of B(Lambda(+)(c)-> pK(-)pi(+)) - art. no. 072005, PHYS REV D, 6207(7), 2000, pp. 2005

21

INGLESE

Article

Physics

PHYSICAL REVIEW D

0556-2821 → ACNP

6207

7

2000

ISI

0556-2821(20001001)6207:7<2005:MOBP-A>2.0.ZU;2-I

The Lambda(c)(+)-->pK(-)pi(+) yield has been measured in a sample of two-je t continuum events containing both a charm tag ("(D) over bar") as well as an antiproton (e(+)e(-) --> (D) over bar (p) over bar X), with the antiprot on in the hemisphere opposite the (D) over bar (measurement of charge conju gate modes is implicit throughout). Under the hypothesis that such selectio n criteria tag e(+)e(-)-->(D) over bar (p) over bar Lambda(c)(+)X events, t he Lambda(c)(+)-->pK(-)pi(+) branching fraction can be determined by measur ing the pK(-)pi(+) yield in the same hemisphere as the antiprotons in our ( D) over bar (p) over bar X sample. Three types of (D) over bar charm tags a re used, pi(soft)(-) (from D*- --> (D) over bar(o) pi(soft)(-) electrons (f rom (D) over bar-->Xe- nu), and fully reconstructed (D) over bar(o) --> Kpi(-) or D- -->K+ pi(-)pi(-) or D-s(-) --> phi pi(-). Combining our results obtained from the three independent charm tags, we obtain B(Lambda(c)(+) - -> pK(-) pi(+)) = (5.0 +/- 0.5 +/- 1.2)%.