We report on the first results of a sensitive search for scalar coupling of photons to a light neutral boson in the mass range of approximately 1.0 meV (milli-electron volts) and coupling strength greater than 10(-6) GeV(-1) using optical photons. This was a photon regeneration experiment using the "light shining through a wall" technique in which laser light was passed through a strong magnetic field upstream of an optical beam dump; regenerated laser light was then searched for downstream of a second magnetic field region optically shielded from the former. Our results show no evidence for scalar coupling in this region of parameter space.
We report on the first results of a search for optical-wavelength photons mixing with hypothetical hidden-sector paraphotons in the mass range between 10 -5 and 10 -2 electron volts for a mixing parameter greater than 10 -7 . This was a generation-regeneration experiment using the "light shining through a wall" technique in which regenerated photons are searched for downstream of an optical barrier that separates it from an upstream generation region. The new limits presented here are approximately three times more sensitive to this mixing than the best previous measurement. The present results indicate no evidence for photon-paraphoton mixing for the range of parameters investigated.PACS numbers: 11.30. Ly, 12.20, Fv 12.60.Cn, 12.90+b, 13.40.Hq The Standard Model (SM) of particle physics [1-5] provides a wonderfully successful, well-tested description of the strong, electromagnetic, and weak interactions between half-integer spin fermions and integer spin bosons at the smallest length scales and highest energies accessible in current experiments. However it has limitations: the apparent failure to explain dark energy and dark matter, an unnaturally small CPviolating parameter associated with the strong interaction, and 19 free parameters, to name a few. If the SM is part of a more fundamental theory which has some new mass scale, new dynamics and particles would appear and hence signal the new physics associated with it. Popular extensions of the SM based upon string theory for example, predict a "hidden sector" of particles that interact with the "visible sector" SM fields only with feeble, gravitational-strength couplings [6][7]. This hidden sector can be probed using very high energy accelerators such as the Large Hadron Collider at the TeV scale, and also by laser experiments at the sub-electron volt (sub-eV) energy scale [8][9][10][11][12][13][14][15][16][17][18][19][20].
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Much of the focus of Beyond the Standard Model physics searches is on the TeV scale, making use of hadron and lepton colliders. Additionally, however, there is the means to make these searches in different regions of parameter space using sub-electron volt photons from a Free Electron Laser, for example. We report on the experimental results of searches for opticalwavelength photons mixing with hypothetical hidden-sector paraphotons in the mass range between 10 -5 and 10 -2 electron volts for a mixing parameter greater than 10 -7 . We also report on the results of a sensitive search for scalar coupling of photons to light neutral bosons in the mass range of approximately 1.0 milli-electron volts and coupling strength greater than 10 -6 GeV -1 . These were generation-regeneration experiments using the "light shining through a wall" technique in which regenerated photons are searched for downstream of an optical barrier that separates it from an upstream generation region. The present results indicate no evidence for photon-paraphoton mixing or for scalar couplings of bosons to photons for the range of parameters investigated. OVERVIEW AND RESULTSIf the Standard Model (SM) is part of a more fundamental theory which has some new mass scale, new dynamics and particles could appear and hence signal the new physics associated with it. Popular extensions of the SM motivated by string theory for example, predict a "hidden sector" of particles that interact with the "visible sector" SM fields only with feeble, gravitational-strength couplings [1][2]. This hidden sector can be probed using very high energy accelerators such as the Large Hadron Collider at the TeV scale, and also by laser experiments at the sub-electron volt (sub-eV) energy scale [3][4][5][6][7][8][9][10][11][12][13]. The importance of this study goes beyond even particle physics. A recent suggestion that paraphotons may give rise to a hidden cosmic microwave background (HCMB) [14] indicates that sub-eV particle physics may have direct bearing on cosmological studies. Additionally, several theories in particle physics as well as cosmology predict the existence of at least one scalar, that is, spin-zero, boson [9][10][11][12][13][14][15][16][17][18][19]. Many theories of physics beyond the SM (BSM) can accommodate scalars
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