Search for new ${\pi }^0$-like particles produced in association with a $\tau$-lepton pair

Abstract

We report on a search in $e^{+}{e}^{-}$ annihilations for new ${\pi }^0$-like particles produced in association with a $\tau$-lepton pair. These objects, with a similar mass and similar decay modes to ${\pi }^0$ 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.

arXiv comment8 pages, 6 figures, submitted to Phys. Rev. D

References in corpus (10)

• The BABAR Detector
• The Precision Monte Carlo Event Generator KK For Two-Fermion Final States In e+e- Collisions
• Measurement of the gamma gamma* --> pi0 transition form factor
• BHWIDE 1.00: O(alpha) YFS Exponentiated Monte Carlo for Bhabha Scattering at Wide Angles for LEP1/SLC and LEP2
• Measurement of gamma gamma* --> pi0 transition form factor at Belle
• Comparing antithetic trends of data for the pion-photon transition form factor
• The pion transition form factor and the pion distribution amplitude
• The puzzle of the π-> γγ* transition form factor
• How the recent BABAR data for P to γγ* affect the Standard Model predictions for the rare decays P to l+l-
• The Pion-Photon Transition Form Factor and New Physics in the Tau Sector

Cited by in corpus (2)

• The Leptonic Higgs Portal
• Searches for Light Scalars, Pseudoscalars, and Gauge Bosons