We search for the rare flavor-changing neutral current process B+→K+τ+τ- using data from the BABAR experiment. The data sample, collected at the center-of-mass energy of the (4S) resonance, corresponds to a total integrated luminosity of 424 fb-1 and to 471×106 BB pairs. We reconstruct one B meson, produced in the (4S)→B+B- decay, in one of many hadronic decay modes and search for activity compatible with a B+→K+τ+τ- decay in the rest of the event. Each τ lepton is required to decay leptonically into an electron or muon and neutrinos. Comparing the expected number of background events with the data sample after applying the selection criteria, we do not find evidence for a signal. The resulting upper limit, at the 90% confidence level, is B(B+→K+τ+τ-)<2.25×10-3.

Search for B+ →k+τ+τ- at the BaBar Experiment

CALABRESE, Roberto;GARZIA, Isabella;LUPPI, Eleonora;
2017

Abstract

We search for the rare flavor-changing neutral current process B+→K+τ+τ- using data from the BABAR experiment. The data sample, collected at the center-of-mass energy of the (4S) resonance, corresponds to a total integrated luminosity of 424 fb-1 and to 471×106 BB pairs. We reconstruct one B meson, produced in the (4S)→B+B- decay, in one of many hadronic decay modes and search for activity compatible with a B+→K+τ+τ- decay in the rest of the event. Each τ lepton is required to decay leptonically into an electron or muon and neutrinos. Comparing the expected number of background events with the data sample after applying the selection criteria, we do not find evidence for a signal. The resulting upper limit, at the 90% confidence level, is B(B+→K+τ+τ-)<2.25×10-3.
2017
Lees, J. P.; Poireau, V.; Tisserand, V.; Grauges, E.; Palano, A.; Eigen, G.; Brown, D. N.; Kolomensky, Y. u. G.; Koch, H.; Schroeder, T.; Hearty, C.; ...espandi
File in questo prodotto:
File Dimensione Formato  
PhysRevLett.118.031802_2017.pdf

solo gestori archivio

Descrizione: versione editoriale
Tipologia: Full text (versione editoriale)
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 385.08 kB
Formato Adobe PDF
385.08 kB Adobe PDF   Visualizza/Apri   Richiedi una copia
Search-for-B-k-at-the-BaBar-Experiment2017Physical-Review-Letters_AAM.pdf

accesso aperto

Descrizione: post print
Tipologia: Post-print
Licenza: PUBBLICO - Pubblico con Copyright
Dimensione 866.02 kB
Formato Adobe PDF
866.02 kB Adobe PDF Visualizza/Apri

I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2365152
Citazioni
  • ???jsp.display-item.citation.pmc??? 1
  • Scopus 70
  • ???jsp.display-item.citation.isi??? 53
social impact