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Title: Search for long-lived scalar particles in B+→K+χ (μ+μ-) decays
Author: Calvo Gomez, M.
Camboni, Alessandro
Coquereau, Samuel
Garrido Beltrán, Lluís
Gascón Fora, David
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Marin Benito, Carla
Picatoste Olloqui, Eduardo
Rives Molina, Vicente José
Alfonso Albero, Alejandro
Gironella Gironell, P.
Vazquez Gomez, R.
LHCb Collaboration
Keywords: Hadrons
Gran Col·lisionador d'Hadrons
Física de partícules
Large Hadron Collider (France and Switzerland)
Particle physics
Issue Date: Apr-2017
Publisher: American Physical Society
Abstract: A search for a long-lived scalar particle χ is performed, looking for the decay B+→K+χ with χ →μ+μ- in p p collision data corresponding to an integrated luminosity of 3 fb-1 , collected by the LHCb experiment at center-of-mass energies of √{s }=7 and 8 TeV. This new scalar particle, predicted by hidden sector models, is assumed to have a narrow width. The signal would manifest itself as an excess in the dimuon invariant mass distribution over the Standard Model background. No significant excess is observed in the accessible ranges of mass 250 <m (χ )<4700 MeV /c2 and lifetime 0.1 <τ (χ )<1000 ps . Upper limits on the branching fraction B (B+→K+χ (μ+μ- )) at 95% confidence level are set as a function of m (χ ) and τ (χ ), varying between 2 ×10-10 and 10-7. These are the most stringent limits to date. The limits are interpreted in the context of a model with a light inflaton particle.
Note: Reproducció del document publicat a:
It is part of: Physical Review D, 2017, vol. 95, num. 071101, p. 1-15
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ISSN: 2470-0010
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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