Phys. Rev. Lett.
86,
5000–5003
(2001)
Bounds on the CP Asymmetry in Like-Sign Dileptons from B0B̅ 0 Meson Decays
D. E. Jaffe et al. (CLEO Collaboration)
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D. E. Jaffe1, R. Mahapatra1, G. Masek1, H. P. Paar1, D. M. Asner2, A. Eppich2, T. S. Hill2, R. J. Morrison2, R. A. Briere3, G. P. Chen3, T. Ferguson3, H. Vogel3, A. Gritsan4, J. P. Alexander5, R. Baker5, C. Bebek5, B. E. Berger5, K. Berkelman5, F. Blanc5, V. Boisvert5, D. G. Cassel5, P. S. Drell5, J. E. Duboscq5, K. M. Ecklund5, R. Ehrlich5, P. Gaidarev5, L. Gibbons5, B. Gittelman5, S. W. Gray5, D. L. Hartill5, B. K. Heltsley5, P. I. Hopman5, L. Hsu5, C. D. Jones5, J. Kandaswamy5, D. L. Kreinick5, M. Lohner5, A. Magerkurth5, T. O. Meyer5, N. B. Mistry5, E. Nordberg5, M. Palmer5, J. R. Patterson5, D. Peterson5, D. Riley5, A. Romano5, J. G. Thayer5, D. Urner5, B. Valant-Spaight5, G. Viehhauser5, A. Warburton5, P. Avery6, C. Prescott6, A. I. Rubiera6, H. Stoeck6, J. Yelton6, G. Brandenburg7, A. Ershov7, D. Y.-J. Kim7, R. Wilson7, T. Bergfeld8, B. I. Eisenstein8, J. Ernst8, G. E. Gladding8, G. D. Gollin8, R. M. Hans8, E. Johnson8, I. Karliner8, M. A. Marsh8, C. Plager8, C. Sedlack8, M. Selen8, J. J. Thaler8, J. Williams8, K. W. Edwards9a,9b, R. Janicek10a,10b, P. M. Patel10a,10b, A. J. Sadoff11, R. Ammar12, A. Bean12, D. Besson12, X. Zhao12, S. Anderson13, V. V. Frolov13, Y. Kubota13, S. J. Lee13, J. J. O'Neill13, R. Poling13, T. Riehle13, A. Smith13, C. J. Stepaniak13, J. Urheim13, S. Ahmed14, M. S. Alam14, S. B. Athar14, L. Jian14, L. Ling14, M. Saleem14, S. Timm14, F. Wappler14, A. Anastassov15, E. Eckhart15, K. K. Gan15, C. Gwon15, T. Hart15, K. Honscheid15, D. Hufnagel15, H. Kagan15, R. Kass15, T. K. Pedlar15, H. Schwarthoff15, J. B. Thayer15, E. von Toerne15, M. M. Zoeller15, S. J. Richichi16, H. Severini16, P. Skubic16, A. Undrus16, V. Savinov17, S. Chen18, J. Fast18, J. W. Hinson18, J. Lee18, D. H. Miller18, E. I. Shibata18, I. P. J. Shipsey18, V. Pavlunin18, D. Cronin-Hennessy19, A. L. Lyon19, W. Park19, E. H. Thorndike19, T. E. Coan20, V. Fadeyev20, Y. S. Gao20, Y. Maravin20, I. Narsky20, R. Stroynowski20, J. Ye20, T. Wlodek20, M. Artuso21, C. Boulahouache21, K. Bukin21, E. Dambasuren21, G. Majumder21, R. Mountain21, S. Schuh21, T. Skwarnicki21, S. Stone21, J. C. Wang21, A. Wolf21, J. Wu21, S. Kopp22, M. Kostin22, A. H. Mahmood23, S. E. Csorna24, I. Danko24, K. W. McLean24, Z. Xu24, R. Godang25, G. Bonvicini26, D. Cinabro26, M. Dubrovin26, S. McGee26, G. J. Zhou26, A. Bornheim27, E. Lipeles27, S. P. Pappas27, M. Schmidtler27, A. Shapiro27, W. M. Sun27, and A. J. Weinstein27 (CLEO Collaboration)
1University of California, San Diego, La Jolla, California 92093
2University of California, Santa Barbara, California 93106
3Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
4University of Colorado, Boulder, Colorado 80309-0390
5Cornell University, Ithanca, New York 14853
6University of Florida, Gainesville, Florida 32611
7Harvard University, Cambridge, Massachusetts 02138
8University of Illinois, Urbana-Champaign, Illinois 61801
9aCarleton University, Ottawa, Ontario, Canada K1S 5B6
9band the Institute of Particle Physics, Canada
10aMcGill University, Montréal, Québec, Canada H3A 2T8
10band the Institute of Particle Physics, Canada
11Ithaca College, Ithaca, New York 14850
12University of Kansas, Lawrence, Kansas 66045
13University of Minnesota, Minneapolis, Minnesota 55455
14State University of New York at Albany, Albany, New York 12222
15The Ohio State University, Columbus, Ohio 43210
16University of Oklahoma, Norman, Oklahoma 73019
17University of Pittsburgh, Pittsburgh, Pennsylvania 15260
18Purdue University, West Lafayette, Indiana 47907
19University of Rochester, Rochester, New York 14627
20Southern Methodist University, Dallas, Texas 75275
21Syracuse University, Syracuse, New York 13244
22University of Texas, Austin, Texas 78712
23University of Texas–Pan American, Edinburg, Texas 78539
24Vanderbilt University, Nashville, Tennessee 37235
25Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
26Wayne State University, Detroit, Michigan 48202
27California Institute of Technology, Pasadena, California 91125
Received 5 January 2001; published in the issue dated 28 May 2001
We have measured the charge asymmetry in like-sign dilepton yields from B0B̅ 0 meson decays using the CLEO detector at the Cornell Electron Storage Ring. We find aℓℓ0≡[N(ℓ+ℓ+)-N(ℓ-ℓ-)]/[N(ℓ+ℓ+)+N(ℓ-ℓ-)] = +0.013±0.050±0.005. We combine this result with a previous, independent measurement and obtain Re(εB)/(1+|εB|2) = +0.0035±0.0103±0.0015 (uncertainties are statistical and systematic, respectively) for the CP impurity parameter, εB.
© 2001 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.5000
DOI:
10.1103/PhysRevLett.86.5000
PACS:
11.30.Er, 13.20.He, 14.40.Nd
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