We present a search for a neutral, long-lived particle L that is produced in e∧{+}e∧{-} collisions and decays at a significant distance from the e∧{+}e∧{-} interaction point into various flavor combinations of two oppositely charged tracks. The analysis uses an e∧{+}e∧{-} data sample with a luminosity of 489.1 fb∧{-1} collected by the BABAR detector at the Υ(4S), Υ(3S), and Υ(2S) resonances and just below the Υ(4S). Fitting the two-track mass distribution in search of a signal peak, we do not observe a significant signal, and set 90% confidence level upper limits on the product of the L production cross section, branching fraction, and reconstruction efficiency for six possible two-body L decay modes as a function of the L mass. The efficiency is given for each final state as a function of the mass, lifetime, and transverse momentum of the candidate, allowing application of the upper limits to any production model. In addition, upper limits are provided on the branching fraction B(B→X-{s}L), where X-{s} is a strange hadronic system.

Search for Long-Lived Particles in e+e- Collisions

LANCERI, LIVIO;VITALE, LORENZO;
2015-01-01

Abstract

We present a search for a neutral, long-lived particle L that is produced in e∧{+}e∧{-} collisions and decays at a significant distance from the e∧{+}e∧{-} interaction point into various flavor combinations of two oppositely charged tracks. The analysis uses an e∧{+}e∧{-} data sample with a luminosity of 489.1 fb∧{-1} collected by the BABAR detector at the Υ(4S), Υ(3S), and Υ(2S) resonances and just below the Υ(4S). Fitting the two-track mass distribution in search of a signal peak, we do not observe a significant signal, and set 90% confidence level upper limits on the product of the L production cross section, branching fraction, and reconstruction efficiency for six possible two-body L decay modes as a function of the L mass. The efficiency is given for each final state as a function of the mass, lifetime, and transverse momentum of the candidate, allowing application of the upper limits to any production model. In addition, upper limits are provided on the branching fraction B(B→X-{s}L), where X-{s} is a strange hadronic system.
2015
http://journals.aps.org/prl/issues/114/17
File in questo prodotto:
File Dimensione Formato  
Search for Long-Lived Particles in esup∧sup+esup∧sup- Collisions.pdf

Accesso chiuso

Descrizione: pdf editoriale
Tipologia: Bozza finale post-referaggio (post-print)
Licenza: Digital Rights Management non definito
Dimensione 1.09 MB
Formato Adobe PDF
1.09 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
Search for Long-Lived Particles in esup∧sup+esup∧sup- Collisions-accepted.pdf

accesso aperto

Descrizione: pdf post-print
Tipologia: Bozza finale post-referaggio (post-print)
Licenza: Digital Rights Management non definito
Dimensione 3.64 MB
Formato Adobe PDF
3.64 MB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS 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/11368/2871912
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 39
  • ???jsp.display-item.citation.isi??? 22
social impact