TY  - JOUR
AU  - BABAR Collaboration (Lees, J. P. et al
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
PY  - 2020
DA  - 2020//
TI  - Search for a Dark Leptophilic Scalar in e(+) e(-) Collisions
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 181801
EP  - 8pp
VL  - 125
IS  - 18
PB  - Amer Physical Soc
AB  - Many scenarios of physics beyond the standard model predict the existence of new gauge singlets, which might be substantially lighter than the weak scale. The experimental constraints on additional scalars with masses in the MeV to GeV range could be significantly weakened if they interact predominantly with leptons rather than quarks. At an e(+) e(-) collider, such a leptophilic scalar (phi(L)) would be produced predominantly through radiation from a tau lepton. We report herein a search for e(+) e(- )-> tau(+) tau(-)phi(L), phi(L)-> l(+) l(-) (l = e, mu) using data collected by the BABAR experiment at SLAC. No significant signal is observed, and we set limits on the phi(L) coupling to leptons in the range 0.04 < m phi(L) < 7.0 GeV. These bounds significantly improve upon the current constraints, excluding almost entirely the parameter space favored by the observed discrepancy in the muon anomalous magnetic moment below 4 GeV at 90% confidence level.
SN  - 0031-9007
UR  - https://arxiv.org/abs/2005.01885
UR  - https://doi.org/10.1103/PhysRevLett.125.181801
DO  - 10.1103/PhysRevLett.125.181801
LA  - English
N1  - WOS:000582670300010
ID  - BABARCollaborationLees_etal2020
ER  -