Photo-production of scalar particles in the field of a circularly polarized laser beam

Villalba-Chávez, Selym; Müller, Carsten

doi:10.1016/j.physletb.2012.11.035

Cited by 39 publications

(45 citation statements)

References 53 publications

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“…In contrast, when low-energy pairs are produced by an even number of photons from a monochromatic field, the corresponding pair production process in the pulse will mainly occur with an odd number of laser photons, which can lead to a very strong suppression of the spin sensitivity. In particular, the value of ζ can either be much larger or significantly smaller than the value of ζ = 6, which is obtained in the strong-field tunneling regime of Breit-Wheeler pair production where ξ ≫ 1 [41].…”

Section: Discussionmentioning

confidence: 88%

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Strong-field Breit-Wheeler pair production in short laser pulses: Relevance of spin effects

et al. 2016

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Production of electron-positron pairs in the collision of a high-energy photon with a high-intensity few-cycle laser pulse is studied. By utilizing the frameworks of laser-dressed spinor and scalar quantum electrodynamics, a comparison between the production of pairs of Dirac and Klein-Gordon particles is drawn. Positron energy spectra and angular distributions are presented for various laser parameters. We identify conditions under which predictions from Klein-Gordon theory either closely resemble or largely differ from those of the proper Dirac theory. In particular, we address the question to which extent the relevance of spin effects is influenced by the short duration of the laser pulse.

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Section: Discussionmentioning

confidence: 88%

“…Thus, intuitively one may say that Dirac pairs are produced with vanishing total spin. The rate ratio of 2 coincides with the number of possible configurations being available for the "spinless" Dirac pairs [41] [51].…”

Section: Spin-resolved Multiphoton Processes In Monochromatic Fimentioning

confidence: 99%

Strong-field Breit-Wheeler pair production in short laser pulses: Relevance of spin effects

et al. 2016

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“…(Right) The anisotropy(26) for the hyperbolic secant (solid curves) and Gaussian (dashed curves) shapes. For ξ 2 = 0.1 and ζ = 4.…”

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confidence: 99%

Breit-Wheeler process in very short electromagnetic pulses

et al. 2013

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The generalized Breit-Wheeler process, i.e. the emission of $e^+e^-$ pairs off a probe photon propagating through a polarized short-pulsed electromagnetic (e.g.\ laser) wave field, is analyzed. We show that the production probability is determined by the interplay of two dynamical effects. The first one is related to the shape and duration of the pulse and the second one is the non-linear dynamics of the interaction of $e^\pm$ with the strong electromagnetic field. The first effect manifests itself most clearly in the weak-field regime, where the small field intensity is compensated by the rapid variation of the electromagnetic field in a limited space-time region, which intensifies the few-photon events and can enhance the production probability by orders of magnitude compared to an infinitely long pulse. Therefore, short pulses may be considered as a powerful amplifier. The non-linear dynamics in the multi-photon Breit-Wheeler regime plays a decisive role at large field intensities, where effects of the pulse shape and duration are less important. In the transition regime, both effects must be taken into account simultaneously. We provide suitable expressions for the $e^+e^-$ production probability for kinematic regions which can be used in transport codes.Comment: 32 pages, 15 figure

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“…Explicit polarization operator approaches to the rate associated with the two-photon reaction may be found in separate papers (see refs. [79] and [82]). In the limit of ξ ǫ ≪ 1 it was obtained that R 1 ∝ ξ 2 ǫ .…”

Section: Jhep06(2015)177mentioning

confidence: 99%

“…The remaining disregarded term is originally proportional to a transverse four-vector Λ µ 3 ∼ κ µ k 2 −k µ (kκ), its eigenvalue being proportional to k 2 in the one-loop approximation. The latter leads to a trivial dispersion equation k 2 = 0 in which case Λ µ 3 ∼ k µ becomes a longitudinal vector that cannot be associated with a physical propagating mode [57,76,79].…”

Section: Absorption and Dispersion Of Small-amplitude Wavesmentioning

confidence: 99%

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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Photo-production of scalar particles in the field of a circularly polarized laser beam

Cited by 39 publications

References 53 publications

Strong-field Breit-Wheeler pair production in short laser pulses: Relevance of spin effects

Strong-field Breit-Wheeler pair production in short laser pulses: Relevance of spin effects

Breit-Wheeler process in very short electromagnetic pulses

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

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