Loop spin effects in intense background fields

Ilderton, Antony; King, B.; Tang, Suo

doi:10.1103/physrevd.102.076013

Cited by 36 publications

(38 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To support this, note that propagation through the plane wave conserves individual particle helicity [87], despite the fact that the plane wave is not a SUSY background. This is already clear from the dressed gluon polarisation vectors (3.3), which are obtained from their vacuum counterparts simply by replacing the asymptotic particle momentum with the dressed momentum.…”

Section: Jhep12(2021)207mentioning

confidence: 99%

One-loop multicollinear limits from 2-point amplitudes on self-dual backgrounds

Adamo

Ilderton

MacLeod

2021

J. High Energ. Phys.

View full text Add to dashboard Cite

For scattering amplitudes in strong background fields, it is — at least in principle — possible to perturbatively expand the background to obtain higher-point vacuum amplitudes. In the case of self-dual plane wave backgrounds we consider this expansion for two-point, one-loop amplitudes in pure Yang-Mills, QED and QCD. This enables us to obtain multicollinear limits of 1-loop vacuum amplitudes; the resulting helicity configurations are surprisingly restricted, with only the all-plus helicity amplitude surviving. These results are shown to be consistent with well-known vacuum amplitudes. We also show that for both abelian and non-abelian supersymmetric gauge theories, there is no helicity flip (and hence no vacuum birefringence) on any plane wave background, generalising a result previously known in the Euler-Heisenberg limit of super-QED.

show abstract

Section: Jhep12(2021)207mentioning

confidence: 99%

One-loop multicollinear limits from 2-point amplitudes on self-dual backgrounds

Adamo

Ilderton

MacLeod

2021

J. High Energ. Phys.

View full text Add to dashboard Cite

show abstract

“…Recently, the rapid development of petawatt (PW) laser technology [14][15][16][17][18][19] and laser wakefield acceleration 20,21 stimulate distinct interest towards development of polarized positron source via nonlinear Breit-Wheeler (NBW) process [22][23][24][25][26][27][28][29] . The positrons created in a strong laser field can be polarized due to the energetically preferred orientation of the positron spin along the local magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Photon polarization effects in polarized electron-positron pair production in a strong laser field

Dai

Shen

et al. 2021

Preprint

View full text Add to dashboard Cite

Deep understanding of photon polarization impact on pair production is essential for the efficient creation of laser driven polarized positron beams, and demands a complete description of polarization effects in strong-field QED processes. We investigate, employing fully polarization resolved Monte Carlo simulations, the correlated photon and electron (positron) polarization effects in multiphoton Breit-Wheeler pair production process during the interaction of an ultrarelativistic electron beam with a counterpropagating elliptically polarized laser pulse. We showed that the polarization of e − e + pairs is degraded by 35%, when the polarization of the intermediate photon is resolved, accompanied with an approximately 13% decrease of the pair yield. Moreover, the polarization direction of energetic positrons in small angle region is reversed, which originates from the pair production of hard photons with polarization parallel with electric field.

show abstract

“…The latter provides the QED description of the polarization of unscattered electrons discussed in [44]. The spin effects resulted from the electron mass loop are also described as a spin rotation, which appeared to be more significant within the tail of a tightly focused laser beam [33]. Furthermore, there are experimental plans to reach the fully nonperturbative regime of QED employing beam-beam collisions in TeV-class lepton colliders [46][47][48][49][50][51], when the effective field in the rest frame of electrons could be supercritical, and radiative corrections to QED processes nonperturbative and substantial.…”

mentioning

confidence: 96%

“…The completely spin-and photon-polarization-resolved probability rates for nonlinear Compton scattering have been derived from strong-field QED theory in the Furry picture for a plane-wave laser field [26], and for the locally constant fields [27], as well as via the quantum operator method [28], and employed for a deep analysis of all polarization channels, helicity transfer in the perturbative regime, and investigation of the polarization dependent energy and angle distributions [29]. Furthermore, the study of polarization effects has been extended to higher-order QED processes [30][31][32][33][34][35], and QED cascades [36].…”

mentioning

confidence: 99%

“…Recently, it has been demonstrated that high-order QED radiative corrections, i.e., the interaction of the electron with its own radiation field, can also affect the electron spin dynamics in intense background fields [31][32][33]. In particular, due to QED loop corrections, the electrons exact spin-dependent wave function becomes unstable inside a strong background field, leading to 1% polarization for unscattered electrons [31,32].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Helicity transfer in strong laser fields via the electron anomalous magnetic moment

Li,

Chen,

Hatsagortsyan

et al. 2021

Preprint

View full text Add to dashboard Cite

Electron beam longitudinal polarization during the interaction with counterpropagating circularly-polarized ultraintense laser pulses is investigated, while accounting for the anomalous magnetic moment of the electron. Although it is known that the helicity transfer from the laser photons to the electron beam is suppressed in linear and nonlinear Compton scattering processes, we show that the helicity transfer nevertheless can happen via an intermediate step of the electron radiative transverse polarization, phase-matched with the driving field, followed up by spin rotation into the longitudinal direction as induced by the anomalous magnetic moment of the electron. With spin-resolved QED Monte Carlo simulations, we demonstrate the consequent helicity transfer from laser photons to the electron beam with a degree up to 10%, along with an electron radial polarization up to 65% after multiple photon emissions in a femtosecond timescale. This effect is detectable with currently achievable laser facilities and provides this way a measurable signature of the electron anomalous magnetic moment.

show abstract

Loop spin effects in intense background fields

Cited by 36 publications

References 55 publications

One-loop multicollinear limits from 2-point amplitudes on self-dual backgrounds

One-loop multicollinear limits from 2-point amplitudes on self-dual backgrounds

Photon polarization effects in polarized electron-positron pair production in a strong laser field

Helicity transfer in strong laser fields via the electron anomalous magnetic moment

Contact Info

Product

Resources

About