Search for the Rare Decay B -> K nu nubar

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We present a search for the rare decays B{sup +} {yields} K{sup +}{nu}{bar {nu}} and B{sup 0} {yields} K{sup 0}{nu}{bar {nu}} using 459 million B{bar B} pairs collected with the BABAR detector at the SLAC National Accelerator Laboratory. Flavor-changing neutral-current decays such as these are forbidden at tree level but can occur through one-loop diagrams in the Standard Model (SM), with possible contributions from new physics at the same order. The presence of two neutrinos in the final state makes identification of signal events challenging, so reconstruction in the semileptonic decay channels B {yields} D{sup (*)}l{nu} of the B meson ... continued below

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10 pages

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del Amo Sanchez, P.; Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; /Annecy, LAPP et al. September 14, 2010.

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We present a search for the rare decays B{sup +} {yields} K{sup +}{nu}{bar {nu}} and B{sup 0} {yields} K{sup 0}{nu}{bar {nu}} using 459 million B{bar B} pairs collected with the BABAR detector at the SLAC National Accelerator Laboratory. Flavor-changing neutral-current decays such as these are forbidden at tree level but can occur through one-loop diagrams in the Standard Model (SM), with possible contributions from new physics at the same order. The presence of two neutrinos in the final state makes identification of signal events challenging, so reconstruction in the semileptonic decay channels B {yields} D{sup (*)}l{nu} of the B meson recoiling from the signal B is used to suppress backgrounds. We set an upper limit at the 90% confidence level of 1.3 x 10{sup -5} on the total branching fraction for B{sup +} {yields} K{sup +}{nu}{bar {nu}}, and 5.6 x 10{sup -5} for B{sup 0} {yields} K{sup 0}{nu}{bar {nu}}. We additionally report partial branching fractions in two ranges of di-neutrino mass squared for B{sup +} {yields} K{sup +}{nu}{bar {nu}}.

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10 pages

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  • Journal Name: Phys.Rev.D82:112002,2010; Journal Volume: 82; Journal Issue: 11

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  • Report No.: SLAC-PUB-14237
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevD.82.112002 | External Link
  • Office of Scientific & Technical Information Report Number: 992893
  • Archival Resource Key: ark:/67531/metadc1013677

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • September 14, 2010

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  • Oct. 14, 2017, 8:36 a.m.

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  • Nov. 3, 2017, 1:49 p.m.

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del Amo Sanchez, P.; Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; /Annecy, LAPP et al. Search for the Rare Decay B -> K nu nubar, article, September 14, 2010; [California]. (digital.library.unt.edu/ark:/67531/metadc1013677/: accessed September 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.