Results 51 to 60 of about 71,268 (259)

Electromagnetic form factors in the light-front formalism and the Feynman triangle diagram: spin-0 and spin-1 two-fermion systems [PDF]

, 2001
The connection between the Feynman triangle diagram and the light-front formalism for spin-0 and spin-1 two-fermion systems is analyzed. It is shown that in the limit q+ = 0 the form factors for both spin-0 and spin-1 systems can be uniquely determined ...
A.V. Efremov, A.V. Efremov, B. Bakamjian, B.D. Keister, B.L.G. Bakker, D. Melikhov, D. Melikhov, D. Melikhov, D. Melikhov, D. Melikhov, D. Melikhov, D. Melikhov, D. Melikhov, D. Melikhov, D. Melikhov, D. Melikhov, Dmitri Melikhov, E. Pace, F. Cardarelli, F. Cardarelli, F. Cardarelli, F. Cardarelli, F. Cardarelli, F. Cardarelli, F. Cardarelli, F. Coester,, G.P. Lepage, G.P. Lepage, H. Leutwyler, H.-M. Choi, H.J. Melosh, I.L. Grach, I.L. Grach, J. Carbonell, J.P.B.C. de Melo, J.P.B.C. de Melo, J.P.B.C. de Melo, J.R. Cooke, L. Frankfurt, L.L. Frankfurt, M. Sawicki, N.B. Demchuk, N.C.J. Schoonderwoerd, N.C.J. Schoonderwoerd, P.A.M. Dirac, P.L. Chung, P.L. Chung, R. Jackiw, S. Glazek,, S. Godfrey, S. Simula, S.J. Brodsky, S.J. Brodsky, S.J. Brodsky, Silvano Simula, T. Frederico, V.A. Karmanov, V.A. Karmanov, V.A. Karmanov, V.A. Karmanov,, V.V. Sudakov, W. Jaus, W. Jaus   +62 more
core   +2 more sources

Fast evaluation of Feynman diagrams [PDF]

Physical Review D, 2000
uses feynmp macros; v2 contains improved description of renormalization, plus other minor ...
Easther, Richard, Guralnik, Gerald, Hahn, Stephen   +2 more
openaire   +2 more sources

UV-finite scalar field theory with unitarity

, 2004
In this paper we show how to define the UV completion of a scalar field theory such that it is both UV-finite and perturbatively unitary. In the UV completed theory, the propagator is an infinite sum of ordinary propagators.
D. Evens, K. Namsrai, Pei-Ming Ho, V.A. Alebastrov, V.A. Alebastrov, Yi-Ya Tian   +5 more
core   +1 more source

Algebraic Reduction of Feynman Diagrams to Scalar Integrals: a Mathematica implementation of LERG-I [PDF]

, 1994
A Mathematica implementation of the program LERG-I is presented that performs the reduction of tensor integrals, encountered in one-loop Feynman diagram calculations, to scalar integrals. The program was originally coded in REDUCE and in that incarnation
't Hooft, Bern, Bern, Brown, Davydychev, Denner, Ezawa, Hou, Hou, Hou, Hou, Hou, Kreimer, Kreimer, Lynn, Oldenborgh, Passarino, Robin G. Stuart, Stuart, Stuart, Stuart   +20 more
core   +2 more sources

Copper Doping Enhances the Activity and Selectivity of Atomically Precise Ag44 Nanoclusters for Photocatalytic CO2 Reduction

Advanced Functional Materials, EarlyView.
By a simple anti‐Galvanic reaction, up to six copper atoms could be preferably doped into the Ag2(SR)5 staple motifs and Ag20 dodecahedral shell of an atomically precise Ag44(SR)30 nanocluster. When anatase TiO2 is used as substrate, the (AgCu)44/TiO2 photocatalyst exhibited much improved activity in photocatalytic CO2 reduction compared to Ag44/TiO2 ...
Ye Liu, Xi Zheng, Xiufan Liu, Tengyuan Gao, Nicola Pinna, Yu Wang   +5 more
wiley   +1 more source

W pair production at lepton colliders in the Feynman-diagram gauge [PDF]

EPJ Web of Conferences
In ref. [1], we calculated helicity amplitudes for e−e+ → W−W+ in the Feynman-diagram (FD) gauge analytically, and showed that the cross section can be understood by the individual γ, Z and ν amplitudes in the FD gauge.
Furusato Hiroyuki, Mawatari Kentarou, Suzuki Yutaro, Zheng Ya-Juan   +3 more
doaj   +1 more source

NLO quark self-energy and dispersion relation using the hard thermal loop resummation

Journal of High Energy Physics, 2023
Using the hard-thermal-loop (HTL) resummation in real-time formalism, we study the next-to-leading order (NLO) quark self-energy and corresponding NLO dispersion laws.
Sumit, Najmul Haque, Binoy Krishna Patra
doaj   +1 more source

Feynman integrals with tensorial structure in the negative dimensional integration scheme [PDF]

, 1999
Negative dimensional integration method (NDIM) is revealing itself as a very useful technique for computing Feynman integrals, massless and/or massive, covariant and non-covariant alike.
Schmidt, A. G. M., Suzuki, A. T.
core   +2 more sources

THz‐Driven Coherent Phonon Fingerprints of Hidden Symmetry Breaking in 2D Layered Hybrid Perovskites

Advanced Materials, EarlyView.
Intense THz pulses are employed to drive coherent phonons in 2D Ruddlesden‐Popper hybrid metal‐halide perovskites (HOIPs) from the (PEA)2(MA)n‐1PbnI3n+1 family, revealing mode‐selective spectroscopic signatures of inversion symmetry breaking in those nominally centrosymmetric materials. These findings provide a handle to decode nonlinear phonon driving
Joanna M. Urban, Michael S. Spencer, Maximilian Frenzel, Gaëlle Trippé‐Allard, Marie Cherasse, Charlotte Berrezueta‐Palacios, Prakriti P. Joshi, Alexander P. Fellows, Olga Minakova, Eduardo B. Barros, Luca Perfetti, Stephanie Reich, Martin Wolf, Emmanuelle Deleporte, Sebastian F. Maehrlein   +14 more
wiley   +1 more source

Photon radiation in $$e^+e^-\;\rightarrow \;$$ e + e - → hadrons at low energies with carlomat_3.1

European Physical Journal C: Particles and Fields, 2017
We present a sample of results for the cross sections of several processes of low energetic $$e^+e^-$$ e + e - annihilation into final states containing pions accompanied by one or two photons, or a light lepton pair.
Fred Jegerlehner, Karol Kołodziej
doaj   +1 more source