Improved upper limits on the flavor-changing neutral current decays B→Kℓ+ℓ- and B→K*(892)ℓ+ℓ-

CLEO Collaboration

Research output: Contribution to journalArticle

Abstract

We have searched a sample of 9.6×106 B¯B events for the flavor-changing neutral current decays B→Kℓ+ℓ- and B→K*(892)ℓ+ℓ-. We subject the latter decay to the requirement that the dilepton mass mℓℓ exceed 0.5 GeV. There is no indication of a signal. We obtain the 90% confidence level upper limits B(B→Kℓ+ℓ-) < 1.7×10-6 and B(B→K*(892)ℓ+ℓ-)mℓℓ>0.5Gev< 3.3×10-6. We also obtain an upper limit on the weighted average 0.65B B(B→Kℓ+ℓ-)+0.35B(B→K*(892)ℓ+ℓ-)mℓℓ>0.5Gev < 1.5×10-6. The weighted-average limit is only 50% above the standard model prediction.

Original languageEnglish
Number of pages1
JournalPhysical Review Letters
Volume87
Issue number18
DOIs
Publication statusPublished - 2001 Jan 1

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neutral currents
decay
confidence
indication
requirements
predictions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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@article{4d94c6115d0e438882d5cd3b7c241736,
title = "Improved upper limits on the flavor-changing neutral current decays B→Kℓ+ℓ- and B→K*(892)ℓ+ℓ-",
abstract = "We have searched a sample of 9.6×106 B¯B events for the flavor-changing neutral current decays B→Kℓ+ℓ- and B→K*(892)ℓ+ℓ-. We subject the latter decay to the requirement that the dilepton mass mℓℓ exceed 0.5 GeV. There is no indication of a signal. We obtain the 90{\%} confidence level upper limits B(B→Kℓ+ℓ-) < 1.7×10-6 and B(B→K*(892)ℓ+ℓ-)mℓℓ>0.5Gev< 3.3×10-6. We also obtain an upper limit on the weighted average 0.65B B(B→Kℓ+ℓ-)+0.35B(B→K*(892)ℓ+ℓ-)mℓℓ>0.5Gev < 1.5×10-6. The weighted-average limit is only 50{\%} above the standard model prediction.",
author = "{CLEO Collaboration} and S. Anderson and Frolov, {V. V.} and Y. Kubota and Lee, {S. J.} and R. Poling and A. Smith and Stepaniak, {C. J.} and J. Urheim and S. Ahmed and Alam, {M. S.} and Athar, {S. B.} and L. Jian and L. Ling and M. Saleem and S. Timm and F. Wappler and A. Anastassov and E. Eckhart and Gan, {K. K.} and C. Gwon and T. Hart and K. Honscheid and D. Hufnagel and H. Kagan and R. Kass and Pedlar, {T. K.} and Thayer, {J. B.} and {Von Toerne}, E. and Zoeller, {M. M.} and Richichi, {S. J.} and H. Severini and P. Skubic and A. Undrus and V. Savinov and S. Chen and Hinson, {J. W.} and J. Lee and Miller, {D. H.} and Shibata, {E. I.} and Shipsey, {I. P.J.} and V. Pavlunin and D. Cronin-Hennessy and Y. Kwon and Lyon, {A. L.} and W. Park and Thorndike, {E. H.} and Coan, {T. E.} and Gao, {Y. S.} and Y. Maravin and I. Narsky",
year = "2001",
month = "1",
day = "1",
doi = "10.1103/PhysRevLett.87.181803",
language = "English",
volume = "87",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "18",

}

Improved upper limits on the flavor-changing neutral current decays B→Kℓ+ℓ- and B→K*(892)ℓ+ℓ-. / CLEO Collaboration.

In: Physical Review Letters, Vol. 87, No. 18, 01.01.2001.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Improved upper limits on the flavor-changing neutral current decays B→Kℓ+ℓ- and B→K*(892)ℓ+ℓ-

AU - CLEO Collaboration

AU - Anderson, S.

AU - Frolov, V. V.

AU - Kubota, Y.

AU - Lee, S. J.

AU - Poling, R.

AU - Smith, A.

AU - Stepaniak, C. J.

AU - Urheim, J.

AU - Ahmed, S.

AU - Alam, M. S.

AU - Athar, S. B.

AU - Jian, L.

AU - Ling, L.

AU - Saleem, M.

AU - Timm, S.

AU - Wappler, F.

AU - Anastassov, A.

AU - Eckhart, E.

AU - Gan, K. K.

AU - Gwon, C.

AU - Hart, T.

AU - Honscheid, K.

AU - Hufnagel, D.

AU - Kagan, H.

AU - Kass, R.

AU - Pedlar, T. K.

AU - Thayer, J. B.

AU - Von Toerne, E.

AU - Zoeller, M. M.

AU - Richichi, S. J.

AU - Severini, H.

AU - Skubic, P.

AU - Undrus, A.

AU - Savinov, V.

AU - Chen, S.

AU - Hinson, J. W.

AU - Lee, J.

AU - Miller, D. H.

AU - Shibata, E. I.

AU - Shipsey, I. P.J.

AU - Pavlunin, V.

AU - Cronin-Hennessy, D.

AU - Kwon, Y.

AU - Lyon, A. L.

AU - Park, W.

AU - Thorndike, E. H.

AU - Coan, T. E.

AU - Gao, Y. S.

AU - Maravin, Y.

AU - Narsky, I.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - We have searched a sample of 9.6×106 B¯B events for the flavor-changing neutral current decays B→Kℓ+ℓ- and B→K*(892)ℓ+ℓ-. We subject the latter decay to the requirement that the dilepton mass mℓℓ exceed 0.5 GeV. There is no indication of a signal. We obtain the 90% confidence level upper limits B(B→Kℓ+ℓ-) < 1.7×10-6 and B(B→K*(892)ℓ+ℓ-)mℓℓ>0.5Gev< 3.3×10-6. We also obtain an upper limit on the weighted average 0.65B B(B→Kℓ+ℓ-)+0.35B(B→K*(892)ℓ+ℓ-)mℓℓ>0.5Gev < 1.5×10-6. The weighted-average limit is only 50% above the standard model prediction.

AB - We have searched a sample of 9.6×106 B¯B events for the flavor-changing neutral current decays B→Kℓ+ℓ- and B→K*(892)ℓ+ℓ-. We subject the latter decay to the requirement that the dilepton mass mℓℓ exceed 0.5 GeV. There is no indication of a signal. We obtain the 90% confidence level upper limits B(B→Kℓ+ℓ-) < 1.7×10-6 and B(B→K*(892)ℓ+ℓ-)mℓℓ>0.5Gev< 3.3×10-6. We also obtain an upper limit on the weighted average 0.65B B(B→Kℓ+ℓ-)+0.35B(B→K*(892)ℓ+ℓ-)mℓℓ>0.5Gev < 1.5×10-6. The weighted-average limit is only 50% above the standard model prediction.

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U2 - 10.1103/PhysRevLett.87.181803

DO - 10.1103/PhysRevLett.87.181803

M3 - Article

AN - SCOPUS:85037238401

VL - 87

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 18

ER -