Search for the electron-positron decay of an axionlike particle from a 590 MeV proton beam dump

Faissner, H.; Heinrigs, W.; Preussger, A.; Reitz, John R.; Samm, D.; Tuchscherer, H.; Kostka, P.; Lanius, K.; Nowak, S.; Spiering, C.; Walter, Michael; Badertscher, A.; Daum, M.; Dietlicher, R.; Zehnder, A.

doi:10.1007/bf01549078

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…of the MSSM are identical to the first inequality of (21) and (22), respectively, under (23) and (25).…”

Section: An Effective µ Parametermentioning

confidence: 68%

“…We will be interested in moderate values of tan β. If the condition (22) were not satisfied, M 2 Z would be negative.…”

Section: B a Large Singlet Vevmentioning

confidence: 99%

“…The limit on F G is improved for m G > 2m e . The limit for m G < 2m e is improved by a beam dump experiment at SIN, which used proton beam and G → γγ decay for detection [22]. The limits from these experiments are shown in Fig.…”

Section: Beam Dump Experimentsmentioning

confidence: 99%

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Electroweak supersymmetry with an approximate U(1) Peccei-Quinn symmetry

Hall

Watari

2004

Phys. Rev. D

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A predictive framework for supersymmetry at the TeV scale is presented, which incorporates the Ciafaloni-Pomarol mechanism for the dynamical determination of the µ parameter. The µ parameter of the MSSM is replaced by λS, where S is a singlet field, and the axion becomes a heavy pseudoscalar, G, by adding a mass, m G , by hand. The explicit breaking of Peccei-Quinn (PQ) symmetry is assumed to be sufficiently weak at the TeV scale that the only observable consequence is the mass m G . Three models for the explicit PQ breaking are given; but the utility of this framework is that the predictions for all physics at the electroweak scale are independent of the particular model for PQ breaking. This framework leads to a theory similar to the MSSM, except that µ is predicted by the Ciafaloni-Pomarol relation, and there are light, weakly-coupled states that lie dominantly in the superfield S. The production and cascade decay of superpartners at colliders occurs as in the MSSM, except that there is one extra stage of the cascade chain, with the next-to-LSP decaying to its "superpartner" ands, dramatically altering the collider signatures for supersymmetry. The framework is compatible with terrestrial experiments and astrophysical observations for a wide range of m G and s . If G is as light as possible, 300 keV < m G < 3MeV, it can have interesting effects on the radiation energy density during the cosmological eras of nucleosynthesis and acoustic oscillations, leading to predictions for N νBBN and N νCM B different from 3.

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“…of the MSSM are identical to the first inequality of (21) and (22), respectively, under (23) and (25).…”

Section: An Effective µ Parametermentioning

confidence: 68%

“…We will be interested in moderate values of tan β. If the condition (22) were not satisfied, M 2 Z would be negative.…”

Section: B a Large Singlet Vevmentioning

confidence: 99%

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Electroweak supersymmetry with an approximate U(1) Peccei-Quinn symmetry

Hall

Watari

2004

Phys. Rev. D

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Search for scalar and pseudoscalar bosons emitted in nuclear decays via their interactions

Faissner

Göttlicher

Matela

et al. 1992

Z. Physik A - Hadrons and Nuclei

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A search for light penetrating scalar and pscudosealar bosons has been performed at the Jfilich nuclear-reactor FRJ-I (Merlin). In nuclear deexcitation processes pseudoscalar particles should be emitted in magnetic transitions and scalar particles in electric transitions. The experiment relies on the detection of the interaction products from the conversion of bosons in the field of an electron or a nucleus with a rotatable multi-scintillator system. The geometrical arrangement of the scintillators allows to distinguish between scalar and pseudoscalar particles via the different angular distributions of the final state photons. We obtain as upper limits for the product of production ratio and interaction cross section Wfor pseudoscalar particles W<6.9 10 -4o cm 2, and for scalar particles W< 1.3 10 -39 cm 2 with 90% confidence.

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