Files
Document type
ArticleVersion
Published versionPublication date
All rights reserved
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/132866
Search for Long-Lived Particles in e+e− Collisions
Journal Title
Director/Tutor
Additional contribution
Journal ISSN
Volume Title
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 ( 4 S ) , Υ ( 3 S ) , and Υ ( 2 S ) resonances and just below the Υ ( 4 S ) . 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.
Related resource
Subject
Subject (English)
Citation
Citation
GRAUGÉS POUS, Eugeni and BABAR Collaboration. Search for Long-Lived Particles in e+e− Collisions. Physical Review Letters. 2015. Vol. 114, num. 17, pags. 171801. ISSN 0031-9007. [consulted: 7 of October of 2026]. Available at: https://hdl.handle.net/2445/132866