B boson search at KLOE/KLOE-2

TL;DR

This paper investigates the search for a hypothetical leptophobic B boson as a Dark Force mediator in KLOE/KLOE-2 experiments, setting upper limits due to no observed signal.

Contribution

It introduces an alternative leptophobic B boson model and applies it to KLOE-2 data, establishing new upper limits on its production.

Findings

No clear B boson signal observed in {}-{\u00a0} invariant mass spectrum.

Upper limits on B boson production are set at 90% confidence level.

The analysis constrains the parameter space for leptophobic B boson models.

Abstract

Following the many contributions, KLOE-2 has done to Dark Matter (DM) searches, an alternative model, where the Dark Force mediator is a hypothetical leptophobic B boson, in contra-position to the U boson or "dark photon", is investigated. The B boson couples mainly to quarks and it can be searched in the Phi decay to {\eta}-B where B will decay in {\pi}0-{\gamma}. So far, investigation of the {\pi}0 -{\gamma} invariant mass shows no clear structure belonging to the signal of the DM mediator, hence, an upper limit in the number of events at 90% with CLs the technique will be established for the decay.