Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Naser Ahmadiniaz"'
Publikováno v:
Physics Letters B, Vol 852, Iss , Pp 138610- (2024)
While the QED photon amplitudes at full momentum so far have been calculated only up to the six-photon level, in the low-energy limit there are explicit formulas for all helicity components even at the N-photon level, obtained by Martin et al. in 200
Externí odkaz:
https://doaj.org/article/60b362532ee7491a8b7e64110268f2f2
Publikováno v:
Nuclear Physics B, Vol 991, Iss , Pp 116217- (2023)
This is the second one of a series of four papers devoted to a first calculation of the scalar and spinor QED four-photon amplitudes completely off-shell. We use the worldline formalism which provides a gauge-invariant decomposition for these amplitu
Externí odkaz:
https://doaj.org/article/de61278d68004af0a876990c782eb8f2
Publikováno v:
Nuclear Physics B, Vol 991, Iss , Pp 116216- (2023)
The present paper is the first in a series of four where we use the worldline formalism to obtain the QED four-photon amplitude completely off-shell. We present the result explicitly in terms of hypergeometric functions, and derivatives thereof, for
Externí odkaz:
https://doaj.org/article/e0929902606e4db885f103985261e9f2
Autor:
Naser Ahmadiniaz, Filippo Maria Balli, Olindo Corradini, Cristhiam Lopez-Arcos, Alexander Quintero Vélez, Christian Schubert
Publikováno v:
Nuclear Physics B, Vol 975, Iss , Pp 115690- (2022)
The relation for the gravity polarisation tensor as the tensor product of two gluon polarisation vectors has been well-known for a long time, but a version of this relation for multi-particle fields is presently still not known. Here we show that in
Externí odkaz:
https://doaj.org/article/b9a67b7f8fd747e786702de50b554776
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 5, Pp 1-35 (2019)
Abstract We consider one-particle reducible (1PR) contributions to QED and scalar QED processes in external fields, at one-loop and two-loop order. We investigate three cases in detail: constant crossed fields, constant magnetic fields, and plane wav
Externí odkaz:
https://doaj.org/article/93b0e05115cc46c9b41485ddb043ee23
Publikováno v:
Journal of High Energy Physics, Vol 2019, Iss 4, Pp 1-35 (2019)
Abstract We present an approach to U⋆(N) Yang-Mills theory in non-commutative space based upon a novel phase-space analysis of the dynamical fields with additional auxiliary variables that generate Lorentz structure and colour degrees of freedom. T
Externí odkaz:
https://doaj.org/article/d58586761f17449198e6f0ca32c0e667
Autor:
Naser Ahmadiniaz, Filippo Maria Balli, Olindo Corradini, José Manuel Dávila, Christian Schubert
Publikováno v:
Nuclear Physics B, Vol 950, Iss , Pp - (2020)
Tree-level scattering amplitudes for a scalar particle coupled to an arbitrary number N of photons and a single graviton are computed. We employ the worldline formalism as the main tool to compute the irreducible part of the amplitude, where all the
Externí odkaz:
https://doaj.org/article/4195184a7ac3435b82ff6f69ecc67fa8
Publikováno v:
Journal of High Energy Physics, Vol 2018, Iss 5, Pp 1-35 (2018)
Abstract In this work we have studied the Kleiss-Kuijf relations for the recently introduced Parke-Taylor factors at one-loop in the CHY approach, that reproduce quadratic Feynman propagators. By doing this, we were able to identify the non-planar on
Externí odkaz:
https://doaj.org/article/2ab832dde612432c9bb2165517b9d2d9
Publikováno v:
Nuclear Physics B, Vol 919, Iss C, Pp 9-24 (2017)
The worldline formalism has previously been used for deriving compact master formulas for the one-loop N-photon amplitudes in both scalar and spinor QED, and in the vacuum as well as in a constant external field. For scalar QED, there is also an anal
Externí odkaz:
https://doaj.org/article/2246e66518e44e62891be64cc0dc9974
Autor:
Naser Ahmadiniaz, Victor Miguel Banda Guzman, Fiorenzo Bastianelli, Olindo Corradini, James P. Edwards, Christian Schubert
Publikováno v:
Moscow University Physics Bulletin. 77:442-445
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f61560a2609e937ed7924ee6f95b0562
https://doi.org/10.3103/s0027134922020321
https://doi.org/10.3103/s0027134922020321