Measurement of B→ρlν decay and |Vub| -: art. no. 052001

被引：0
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作者：
Behrens, BH [1 ]
Ford, WT
Gritsan, A
Krieg, H
Roy, J
Smith, JG
Alexander, JP
Baker, R
Bebek, C
Berger, BE
Berkelman, K
Boisvert, V
Cassel, DG
Crowcroft, DS
Dickson, M
von Dombrowski, S
Drell, PS
Ecklund, KM
Ehrlich, R
Foland, AD
Gaidarev, P
Gibbons, L
Gittelman, B
Gray, SW
Hartill, DL
Heltsley, BK
Hopman, PI
Kreinick, DL
Lee, T
Liu, Y
Meyer, TO
Mistry, NB
Ng, CR
Nordberg, E
Ogg, M
Patterson, JR
Peterson, D
Riley, D
Thayer, JG
Thies, PG
Valant-Spaight, B
Warburton, A
Ward, C
Athanas, M
Avery, P
Jones, CD
Lohner, M
Prescott, C
Rubiera, AI
Yelton, J
机构：
[1] Univ Colorado, Boulder, CO 80309 USA
[2] Cornell Univ, Ithaca, NY 14853 USA
[3] Univ Florida, Gainesville, FL 32611 USA
[4] Harvard Univ, Cambridge, MA 02138 USA
[5] Univ Illinois, Urbana, IL 61801 USA
[6] Univ Hawaii Manoa, Honolulu, HI 96822 USA
[7] Carleton Univ, Ottawa, ON K1S 5B6, Canada
[8] Inst Particle Phys, Ottawa, ON, Canada
[9] McGill Univ, Montreal, PQ H3A 2T8, Canada
[10] Univ Kansas, Lawrence, KS 66045 USA
[11] Univ Minnesota, Minneapolis, MN 55455 USA
[12] SUNY Albany, Albany, NY 12222 USA
[13] Ohio State Univ, Columbus, OH 43210 USA
[14] Univ Oklahoma, Norman, OK 73019 USA
[15] Purdue Univ, W Lafayette, IN 47907 USA
[16] Univ Rochester, Rochester, NY 14627 USA
[17] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA
[18] So Methodist Univ, Dallas, TX 75275 USA
[19] Syracuse Univ, Syracuse, NY 13244 USA
[20] Vanderbilt Univ, Nashville, TN 37235 USA
[21] Virginia Polytech Inst & State Univ, Blacksburg, VA 24061 USA
[22] Wayne State Univ, Detroit, MI 48202 USA
[23] CALTECH, Pasadena, CA 91125 USA
[24] Univ Calif San Diego, La Jolla, CA 92093 USA
[25] Univ Calif Santa Barbara, Santa Barbara, CA 93106 USA
[26] Univ Texas, Austin, TX 78712 USA
[27] Yonsei Univ, Seoul 120749, South Korea
[28] Univ Cincinnati, Cincinnati, OH 45221 USA
来源：
PHYSICAL REVIEW D | 2000年 / 61卷 / 05期
关键词：
D O I：
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中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Using a sample of 3.3 X 10(6) Y (4S) --> B (B) over bar events collected with the CLEO II detector at the Cornell Electron Storage Ring (CESR), we measure B(B --> rho l nu), \V-ub\, and the partial rate (Delta Gamma) in three bins of q(2) = (p(B) - p(rho))(2). We find B(B-0 --> rho (-)l(+) nu) = (2.69+/-0.4(-0.40)(+0.35)+/-0.50) X 10(-4), \V-ub\ = (3 23+/-0.24(-0.26)(+0.23)+/-0.58) X 10(-3), Delta Gamma(0 < q(2) < 7 GeV2/c(4)) = (7.6+/-3.0(-1.2)(+0.9)+/-3.0) X 10(-2) ns(-1), Delta Gamma(7 < q(2) < 14 GeV2/c(4)) = (4.8+/-2.9(-0.8)(+0.7)+/-0.7) X 10(-2) ns(-1), and Delta Gamma(14 < q(2) < 21 GeV2/c(4)) = (7.1+/-2.1(-1.1)(+0.9)+/-0.6) X 10(-2) ns(-1). Here, l = e or mu, but not both, and the errors are statistical, systematic, and theoretical. The method is sensitive primarily to B --> rho l nu decays with leptons in the energy range above 2.3 GeV. Averaging with the previously published CLEO results for B --> rho l nu, we obtain B(B-0 --> rho(-)l(+) nu) = (2.57+/-0.29(-0.46)(+0.33)+/-0.41) X 10(-4) and \V-ub\ = (3.25+/-0.14(-0.29)(+0.21)+/-0.55) X 10(-3).
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