A Supersymmetric Resolution of the KARMEN Anomaly

Abstract

We consider the hypothesis that the recently reported anomaly in the time structure of signals in the KARMEN experiment is due to the production of a light photino (or Zino) which decays radiatively due to violation of $R$-parity. Such a particle is shown to be consistent with all experimental data and with cosmological nucleosynthesis. There are difficulties with constraints from SN~1987A but these may be evaded if squarks are non-degenerate in mass.

LaTeX; 8 pages, 2 figures (uuencoded compressed postscript files included); Physics Letters B (in press); (Changes: References updated ; One expression corrected without any changes in conclusions)

References in corpus (10)

• Protecting the Primordial Baryon Asymmetry From Erasure by Sphalerons
• Remarks on the KARMEN Anomaly
• New LEP bounds on $B$-violating scalar couplings: R-parity violating supersymmetry or diquarks
• Neutrino Masses
• New LEP constraints on some supersymmetric Yukawa interactions that violate R-parity
• D- and τ-Decays: Placing New Bounds on R-Parity--Violating Supersymmetric Couplings
• Hypercharge and the Cosmological Baryon Asymmetry
• Search for the Hypothetical pi -> mu x Decay
• Massive Tau Neutrino and SN 1987a
• Effects of $e^{-}{e}^{+}{\nu }_e$ Decays of Tau Neutrinos Near A Supernova

Cited by in corpus (20)

• Phenomenological constraints on broken R parity symmetry in supersymmetry models
• Search for heavy neutrinos mixing with tau neutrinos
• $R$-parity-Violating Supersymmetric Yukawa Couplings: A Mini-review
• Cosmological and astrophysical bounds on a heavy sterile neutrino and the KARMEN anomaly
• A supersymmetric solution to the KARMEN time anomaly
• Attempts at Explaining the NuTeV Observation of Di-Muon Events
• R-parity Violation and Light Neutralinos at ANUBIS and MAPP
• The KARMEN Time Anomaly: Search for a Neutral Particle of Mass 33.9 MeV in Pion Decay
• QCD Corrections to Resonant Slepton Production in Hadron Colliders
• Long-lived light neutralinos at Belle II
• Searching for light long-lived neutralinos at Super-Kamiokande
• Probing $R$-parity violation in $B$-meson decays to a baryon and a light neutralino
• The KARMEN anomaly, light neutralinos and type II supernovae
• Time-delayed electrons from neutral currents at the LHC
• A Brane-World Explanation of the KARMEN Anomaly
• Searching for light neutralinos with a displaced vertex at the LHC
• Searching for long-lived light neutralinos and axionlike particles at the SHiNESS experiment
• Prospects of Squark & Slepton searches at a Gamma Gamma Collider
• SN1987A - a Testing Ground for the KARMEN Anomaly
• Does the KARMEN time anomaly originate from a beam-correlated background?