Evidence for B+ to K0barK+ and B0 to K0K0bar, and Measurement of the Branching Fraction and Search for Direct CP Violation in B+ to K0pi+

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The authors present evidence for the b {yields} d penguin-dominated decays B{sup +} {yields} {bar K}{sup 0}K{sup +} and B{sup 0} {yields} K{sup 0}{bar K}{sup 0} with significances of 3.5 and 4.5 standard deviations, respectively. The results are based on a sample of 227 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. We measure the branching fractions {Beta}(B{sup +} {yields} {bar K}{sup 0}K{sup +}) = (1.5 {+-} 0.5 {+-} 0.1) x 10{sup -6} (< 2.4 x 10{sup -6}) and {Beta}(B{sup 0} {yields} K{sup 0}{bar K}{sup 0}) = ... continued below

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8 pages

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Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P. et al. July 12, 2005.

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The authors present evidence for the b {yields} d penguin-dominated decays B{sup +} {yields} {bar K}{sup 0}K{sup +} and B{sup 0} {yields} K{sup 0}{bar K}{sup 0} with significances of 3.5 and 4.5 standard deviations, respectively. The results are based on a sample of 227 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at SLAC. We measure the branching fractions {Beta}(B{sup +} {yields} {bar K}{sup 0}K{sup +}) = (1.5 {+-} 0.5 {+-} 0.1) x 10{sup -6} (< 2.4 x 10{sup -6}) and {Beta}(B{sup 0} {yields} K{sup 0}{bar K}{sup 0}) = (1.19{sub -0.35}{sup +0.40} {+-} 0.13) x 10{sup -6}, where the uncertainties are statistical and systematic, respectively, and the upper limit on the branching fraction for {bar K}{sup 0}K{sup +} is at the 90% confidence level. They also present improved measurements of the charge-averaged branching fraction {Beta}(B{sup +} {yields} K{sup 0}{pi}{sup +}) = (26.0 {+-} 1.3 {+-} 1.0) x 10{sup -6} and CP-violating charge asymmetry {Alpha}{sub CP} (K{sup 0}{pi}{sup +}) = -0.09 {+-} 0.05 {+-} 0.01, where the uncertainties are statistical and systematic, respectively.

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8 pages

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  • Journal Name: Physical Review Letters; Journal Volume: 95

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  • Report No.: SLAC-PUB-11334
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 878844
  • Archival Resource Key: ark:/67531/metadc877617

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  • July 12, 2005

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • July 25, 2017, 9:51 a.m.

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Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P. et al. Evidence for B+ to K0barK+ and B0 to K0K0bar, and Measurement of the Branching Fraction and Search for Direct CP Violation in B+ to K0pi+, article, July 12, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc877617/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.