Axion Searches in the Past, at Present, and in the Near Future

Battesti, Rémy; Beltrán, B.; Davoudias, Hooman; Kuster, M.; Pugnat, P.; Rabadán, Raoul; Ringwald, Andreas; Spooner, N. J. C.; Zioutas, K.

doi:10.1007/978-3-540-73518-2_10

Cited by 45 publications

(57 citation statements)

References 42 publications

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“…1 In this case, such a scale can be determined from its coupling to two photons or two gluon fields: L ¼ 1 8 g F F a þ 1 8 g g G Â G a, where g ¼ 8=ðf Þ and g g ¼ 3 s =ðf g Þ. A variety of experiments have explored scalar or pseudoscalars with these properties, but most of them are just sensitive to m a < 1 GeV [7]. The super KEKB upgrade to KEKB is expected to improve an existing bound on g up to <1:9 Â 10 À6 GeV À1 for a mass m a < 0:13 GeV.…”

Section: A Global Uð1þ Symmetriesmentioning

confidence: 98%

Phenomenology of flavon fields at the LHC

Tsumura

Velasco-Sevilla

2010

Phys. Rev. D

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We study low energy constraints from flavour violating processes, production and decay at the LHC of a scalar field varphi (flavon) associated to the breaking of a non-supersymmetric Abelian family symmetry at the TeV scale. This symmetry is constrained to reproduce fermion masses and mixing, up to O(1) coefficients. The non-supersymmetric gauged U(1) models considered are severely restricted by cancellation of anomalies and LEP bounds on contact interactions, consequently its phenomenology is out of the LHC reach. We therefore introduce an effective U(1) which is not gauged and it is broken explicitly by a CP odd term at the TeV scale. This helps us to explore flavour violating processes, production and decay at the LHC for these kind of light scalars. In this context we first study the constraints on the flavon mass and its vacuum expectation value from low energy flavour changing processes such as \mu -> e\gamma . We find that a flavon of about m_\phi <~ 150 GeV could be experimentally allowed. These kind of flavons could be significantly generated at the LHC via the gluon fusion mechanism and the single top production channel g u -> t \phi. The produced flavons can have characteristic decay modes such as t \bar{c} for m_\phi >~ m_t, and \tau \bar{\mu} for m_\phi <~ m_t, which could be effectively useful to detect flavons.Comment: 41 pages, 6 figures. Replacement that matches the published version, except some minor details about English style, with added references and minor corrections, one figure replaced

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Section: A Global Uð1þ Symmetriesmentioning

confidence: 98%

Phenomenology of flavon fields at the LHC

Tsumura

Velasco-Sevilla

2010

Phys. Rev. D

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“…propagating unchanged, while the parallel polarization k and the would-be longitudinal polarization change their propagation. 3 For completeness, we give the full propagator without the assumptionk ÁB ¼ 0:…”

Section: Particular Case: No Axion Backgroundmentioning

confidence: 99%

“…Their contribution to the mass density results from the energy stored in the collective oscillations around the minimum of the axion potential aðtÞ ¼ a 0 cosðmtÞ; (1) with a frequency that is given by the axion mass m. We know that this mass must be somewhere in the range [3] 1 eV > m > 10 À6 eV:…”

Section: Introductionmentioning

confidence: 99%

Photon propagation in a cold axion background with and without magnetic field

Espriu

Renau

2012

Phys. Rev. D

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A cold relic axion condensate resulting from vacuum misalignment in the early Universe oscillates with a frequency m, where m is the axion mass. We determine the properties of photons propagating in a simplified version of such a background where the sinusoidal variation is replaced by a square wave profile. We prove that previous results, which indicated that charged particles moving fast in such a background radiate (originally derived assuming that all momenta involved were much larger than m), hold for long wavelengths, too. We also analyze in detail how the introduction of a magnetic field changes the properties of photon propagation in such a medium. We briefly comment on possible astrophysical implications of these results.

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“…These (hypothetic) particles can play a fundamental role in the formation of Dark Matter (DM), whose contribution into the Universe energy balance is estimated to be about 23% (see, e.g., [2][3][4][5]). The axion electrodynamics established by Weinberg and Wilczek [6][7][8] gives us a new instrument for DM investigation since the model of coupling between photons and the pseudoscalar (axion) field proposed by Ni in [9] predicts the effect of polarization rotation when the electromagnetic waves travel through the axion system (see, e.g., [10][11][12][13]).…”

Section: Introductionmentioning

confidence: 99%

Extended axion electrodynamics: Optical activity induced by nonstationary dark matter

Balakin

Tarasova

2012

Gravit. Cosmol.

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We suggest a new self-consistent Einstein-Maxwell-axion model based on the Lagrangian which is linear in the pseudoscalar (axion) field and its four-gradient and includes the four-vector of macroscopic velocity of the axion system as a whole. We consider extended equations of axion electrodynamics and the modified gravity field equations and discuss nonstationary effects in the phenomenon of optical activity induced by axions.

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Axion Searches in the Past, at Present, and in the Near Future

Cited by 45 publications

References 42 publications

Phenomenology of flavon fields at the LHC

Phenomenology of flavon fields at the LHC

Photon propagation in a cold axion background with and without magnetic field

Extended axion electrodynamics: Optical activity induced by nonstationary dark matter

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