Search for the rare decayB→Kνν¯
Citations Over TimeTop 10% of 2010 papers
Abstract
We present a search for the rare decays ${B}^{+}\ensuremath{\rightarrow}{K}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ and ${B}^{0}\ensuremath{\rightarrow}{K}^{0}\ensuremath{\nu}\overline{\ensuremath{\nu}}$ using $459\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ 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 $B\ensuremath{\rightarrow}{D}^{(*)}l\ensuremath{\nu}$ of the $B$ meson recoiling from the signal $B$ is used to suppress backgrounds. We set an upper limit at the 90% confidence level (CL) of $1.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ on the total branching fraction for ${B}^{+}\ensuremath{\rightarrow}{K}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, and $5.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ for ${B}^{0}\ensuremath{\rightarrow}{K}^{0}\ensuremath{\nu}\overline{\ensuremath{\nu}}$. We additionally report 90% CL upper limits on partial branching fractions in two ranges of dineutrino mass squared for ${B}^{+}\ensuremath{\rightarrow}{K}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$.
Related Papers
- Susquehanna Chorale Spring Concert "Roots and Wings"(2017)
- IDENTIFIKASI MODE RUSAK JAMAK (MULTI-FAULTS) BANTALAN MENGGUNAKAN ANALISIS ENVELOPE PADA TURBIN ANGIN Horizontal Axis(2018)
- ANALISIS PERLAKUAN AKUNTANSI PRODUK RUSAK PADA PT. AJINOMOTO INDONESIA MOJOKERTO FACTORY(2017)
- → ИСПОЛЬЗОВAНИЕ ПОТЕНЦИAЛA СОЦИAЛЬНЫХ ПAРТНЕРОВ В ПОДГОТОВКЕ БУДУЩИХ ПЕДAГОГОВ(2024)
- Perbedaan Kinerja Karyawan Sebelum dan Sesudah Penerapan Uraian Pekerjaan(2001)