Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/132498
Title: Evidence for the Rare Decay Σ+ →pμ+μ-
Author: Alfonso Albero, Alejandro
Badalov, Alexey
Calvo Gómez, Míriam
Camboni, Alessandro
Coquereau, Samuel
Fernandez, G.
Garrido Beltrán, Lluís
Gascón Fora, David
Graciani Díaz, Ricardo
Graugés Pous, Eugeni
Marin Benito, Carla
Picatoste Olloqui, Eduardo
Vilasis-Cardona, Xavier
LHCb Collaboration
Keywords: Física de partícules
Experiments
Particle physics
Experiments
Issue Date: 31-May-2018
Publisher: American Physical Society
Abstract: A search for the rare decay Σ + → p μ + μ − is performed using p p collision data recorded by the LHCb experiment at center-of-mass energies √ s = 7 and 8 TeV, corresponding to an integrated luminosity of 3     fb − 1 . An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. No significant structure is observed in the dimuon invariant mass distribution, in contrast with a previous result from the HyperCP experiment. The measured Σ + → p μ + μ − branching fraction is ( 2.2 + 1.8 − 1.3 ) × 10 − 8 , where statistical and systematic uncertainties are included, which is consistent with the standard model prediction.
Note: Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.120.221803
It is part of: Physical Review Letters, 2018, vol. 120, num. 22, p. 221803
URI: http://hdl.handle.net/2445/132498
Related resource: https://doi.org/10.1103/PhysRevLett.120.221803
ISSN: 0031-9007
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Electrònica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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