We report on a search in e+e- annihilations for new π0-like particles produced in association with a τ-lepton pair. These objects, with a similar mass and similar decay modes to π0 mesons, could provide an explanation for the non-asymptotic behavior of the pion-photon transition form factor observed by the BABAR Collaboration. No significant signal is observed, and limits on the production cross section at the level of 73 fb or 370 fb, depending on the model parameters, are determined at 90% confidence level. These upper limits lie below the cross section values needed to explain the BABAR form factor data.

Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2014). Search for new π0 -like particles produced in association with a τ -lepton pair. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 90(11) [10.1103/PhysRevD.90.112011].

Search for new π0 -like particles produced in association with a τ -lepton pair

Martinelli M.;CARPINELLI, Massimo
Membro del Collaboration Group
;
2014

Abstract

We report on a search in e+e- annihilations for new π0-like particles produced in association with a τ-lepton pair. These objects, with a similar mass and similar decay modes to π0 mesons, could provide an explanation for the non-asymptotic behavior of the pion-photon transition form factor observed by the BABAR Collaboration. No significant signal is observed, and limits on the production cross section at the level of 73 fb or 370 fb, depending on the model parameters, are determined at 90% confidence level. These upper limits lie below the cross section values needed to explain the BABAR form factor data.
Articolo in rivista - Articolo scientifico
Monte-Carlo; Radiative-Corrections; Pseudoscalar Meson; Babar Detector; Decay
English
2014
90
11
112011
none
Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2014). Search for new π0 -like particles produced in association with a τ -lepton pair. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 90(11) [10.1103/PhysRevD.90.112011].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389208
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