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 (φL) would be produced predominantly through radiation from a τ lepton. We report herein a search for e+e-→τ+τ-φL, φL→ℓ+ℓ- (ℓ=e, μ) using data collected by the BABAR experiment at SLAC. No significant signal is observed, and we set limits on the φL coupling to leptons in the range 0.04<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.

Lees J.P., Poireau V., Tisserand V., Grauges E., Palano A., Eigen G., et al. (2020). Search for a Dark Leptophilic Scalar in e+e- Collisions. PHYSICAL REVIEW LETTERS, 125(18), 1-8 [10.1103/PhysRevLett.125.181801].

Search for a Dark Leptophilic Scalar in e+e- Collisions

Patrignani C.;
2020

Abstract

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 (φL) would be produced predominantly through radiation from a τ lepton. We report herein a search for e+e-→τ+τ-φL, φL→ℓ+ℓ- (ℓ=e, μ) using data collected by the BABAR experiment at SLAC. No significant signal is observed, and we set limits on the φL coupling to leptons in the range 0.04<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.
2020
Lees J.P., Poireau V., Tisserand V., Grauges E., Palano A., Eigen G., et al. (2020). Search for a Dark Leptophilic Scalar in e+e- Collisions. PHYSICAL REVIEW LETTERS, 125(18), 1-8 [10.1103/PhysRevLett.125.181801].
Lees J.P.; Poireau V.; Tisserand V.; Grauges E.; Palano A.; Eigen G.; Brown D.N.; Kolomensky Y.G.; Fritsch M.; Koch H.; Schroeder T.; Cheaib R.; Heart...espandi
File in questo prodotto:
File Dimensione Formato  
h_11585_805514.pdf

accesso aperto

Tipo: Versione (PDF) editoriale
Licenza: Licenza per Accesso Aperto. Creative Commons Attribuzione (CCBY)
Dimensione 1.69 MB
Formato Adobe PDF
1.69 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/805514
Citazioni
  • ???jsp.display-item.citation.pmc??? 0
  • Scopus 29
  • ???jsp.display-item.citation.isi??? 16
social impact