New ALPS results on hidden-sector lightweights

Ehret, K.; Frede, M.; Ghazaryan, S.; Hildebrandt, Matthias; Knabbe, Ernst-Axel; Kracht, Dietmar; Lindner, A.; List, Jenny; Meier, T.; Meyer, N. T.; Notz, D.; Redondo, Javier; Ringwald, Andreas; Wiedemann, Günter; Willke, B.

doi:10.1016/j.physletb.2010.04.066

Cited by 381 publications

(442 citation statements)

References 66 publications

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“…For HSPs, the experiment was sufficiently sensitive to improve previous exclusion limits. For ALPs, it was-in a small mass range-more sensitive than other purely laboratory-based experiments (namely, laser LSW of the first generation like ALPS-1 [14]) but less sensitive than extraterrestrial experiments like CERN Axion Solar Telescope (CAST) [36]. This is the first time ALPs have been probed by a microwave-based LSW experiment.…”

Section: Discussionmentioning

confidence: 99%

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First results of the CERN Resonant Weakly Interacting sub-eV Particle Search (CROWS)

et al. 2013

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The CERN Resonant Weakly Interacting sub-eV Particle Search probes the existence of weakly interacting sub-eV particles like axions or hidden sector photons. It is based on the principle of an optical light shining through the wall experiment, adapted to microwaves. Critical aspects of the experiment are electromagnetic shielding, design and operation of low loss cavity resonators, and the detection of weak sinusoidal microwave signals. Lower bounds are set on the coupling constant g ¼ 4:5 Â 10 À8 GeV À1 for axionlike particles with a mass of m a ¼ 7:2 eV. For hidden sector photons, lower bounds are set for the coupling constant ¼ 4:1 Â 10 À9 at a mass of m 0 ¼ 10:8 eV. For the latter we are probing a previously unexplored region in the parameter space.

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Section: Discussionmentioning

confidence: 99%

“…To improve the low conversion probability, mirrors can be placed at each end of the emitting and detection regions, forming optical resonators and allowing the photons to pass several times through the magnetic field. This has been done, for example, in the ALPS-1 experiment [14].…”

Section: Experimental Detection Principlementioning

confidence: 99%

First results of the CERN Resonant Weakly Interacting sub-eV Particle Search (CROWS)

et al. 2013

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“…Indeed, on the basis of the mentioned optical properties of the polarized vacuum, collaborations such as BFRT [29], PVLAS [30,31], BMV [32], and Q & A [33] have performed high-precision polarimetric measurements on a low-energy photon beam which traverses a magnetic field region. Likewise, based on the idea of photon regeneration, many "Light Shining Through a Wall" experiments have been put forward [34][35][36][37][38][39][40][41][42], but in none of these setups a weakly interacting sub-eV particle has been detected so far. Instead, the range of the unknown particle masses and coupling constants has been constricted.…”

Section: Jhep06(2015)177mentioning

confidence: 99%

“…The respective 95% confidence levels needed to reproduce these results are summarized in refs. [12,34].…”

Section: Jhep06(2015)177mentioning

confidence: 99%

“…Instead, we have incorporated the upper bound obtained from the ALPS collaboration [34] which -at the time of writing -turns out to be the most stringent laboratory-based limit for MCPs in a model with massless paraphotons. Also, included are the exclusion regions resulting from other experimental collaborations dealing with the Light Shining Through a Wall mechanism such as BMV [41], BFRT [29] and GammeV [36].…”

Section: Jhep06(2015)177mentioning

confidence: 99%

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Light dark matter candidates in intense laser pulses I: paraphotons and fermionic minicharged particles

Villalba-Chávez

Müller

2015

J. High Energ. Phys.

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Polarimetric experiments driven by the strong field of a circularly polarized laser wave can become a powerful tool to limit the parameter space of not yet detected hidden-photons and minicharged particles associated with extra U(1) gauge symmetries. We show how the absorption and dispersion of probe electromagnetic waves in the vacuum polarized by such a background are modified due to the coupling between the visible U(1)-gauge sector and these hypothetical degrees of freedom. The results of this analysis reveal that the regime close to the two-photon reaction threshold can be a sensititive probe of these hidden particles. Parameters of modern laser systems are used to estimate the projected sensitivities on the corresponding coupling constants in regions where experiments driven by dipole magnets are less constricted. The role played by a paraphoton field is analyzed via a comparison with a model in which the existence of minicharges is assumed only. For both scenarios is found that the most stringent exclusion limit occurs at the lowest threshold mass; this one being determined by a certain combination of the field frequencies and dictated by energy momentum balance of the photo-production of a pair of minicharged particles. The dependencies of the observables on the laser attributes as well as on the unknown particle parameters are also analyzed.

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Spin clocks: Probing fundamental symmetries in nature

et al. 2013

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The detection of the free precession of co-located 3 He/ 129 Xe nuclear spins (clock comparison) is used as ultra-sensitive probe for non-magnetic spin interactions, since the magnetic dipole interaction (Zeeman-term) drops out in the weighted frequency difference, i.e., ω = ω He - Features of frequency standards and clocksSince Galileo Galilei and Christiaan Huygens invented the pendulum clock, time and frequency have been the quantities that we can measure with the highest precision. Since 1967 the Cs atomic clock defines our unit of time, the second, as the period during which a cesium-133 atom oscillates 9,192,631,770 number of cycles on the hyperfine clock transition |F = 4, m F = 0 → |F = 3, m F = 0 in the 6 2 S 1/2 atomic ground state. Cesium atomic clocks have been gradually improved to the point where modern cesium-fountain clocks realize the definition of the second with a relative uncertainty of about 4 × 10 −16 [1]. In the near future, the cesium clock defining the fundamental timing reference will be replaced with an optical clock, since suppression of systematic effects shifting the frequency of a standard is greatly facilitated by the use of higher frequencies.Thanks to the incredible high relative accuracy of frequency determination, atomic clocks may touch the μHz range on an absolute scale, but will essentially not go far below.To address fundamental questions in physics often associated with the experimental search for violation of fundamental symmetries in nature, much smaller frequencies or frequency shifts as a result of tiny changes in the clock transition must be tracked. From that point of view it is more appropriate to develop a "clock" that oscillates at low frequencies (∼10 Hz), but shows the same relative accuracy as a Cs atomic clock. Thus, frequency shifts in the pHz range caused by hypothetical interaction potentials might be accessible."Spin clocks" which are based on nuclear spin precession are the most promising approach to reach such sensitivity limits. The ,,spin clock" described here is based on the detection of free spin-precession of gaseous, nuclear spin-polarized 3 He or 129 Xe samples [2]. Like in a free induction decay (FID) measurement, the decay of the transverse magnetization is monitored and the Larmor frequency ω of the precessing sample magnetization is related to the magnetic field B 0 through ω = γ · B 0 , where γ is the gyromagnetic ratio of the corresponding nucleus. Since this type of clock will preferably operate at low magnetic fields and thus at low frequencies, using a SQUID as magnetic field detector is appropriate due to its high sensitivity in that spectral range. The 3 He/ 129 Xe nuclear spins are polarized by means of optical pumping. Thus, the nuclear polarization obtained exceeds the Boltzmann polarization as used in typical NMR experiments by four to five orders of magnitude.

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New ALPS results on hidden-sector lightweights

Abstract: A physicist discusses how to visualize a molecule changing shape.

Cited by 381 publications

References 66 publications

First results of the CERN Resonant Weakly Interacting sub-eV Particle Search (CROWS)

First results of the CERN Resonant Weakly Interacting sub-eV Particle Search (CROWS)

Light dark matter candidates in intense laser pulses I: paraphotons and fermionic minicharged particles

Spin clocks: Probing fundamental symmetries in nature

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