Large impact parameter cut-off in the process e+e−→e+e−γ

Blinov, A. E.; Bondar, A.; Eidelman, Yu.I.; Groshev, V.R.; Mishnev, S. I.; Никитин, С.А.; Onuchin, A. P.; Petrov, Vladimir; Protopopov, I.Ya.; Shamov, A.G.; Sidorov, V.; Tayursky, V.A.; Tikhonov, Yu. A.; Tumaikin, G.M.; Воробйов, А.І.; Zholents, A.

doi:10.1016/0370-2693(82)90777-8

Cited by 33 publications

(30 citation statements)

References 3 publications

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“…Let us emphasize that the logarithmic beam-size effect has been already established in experiments [8,9]. 3.…”

Section: Discussionmentioning

confidence: 73%

“…In the overwhelming majority of experiments both descriptions provide the same result. However, in a number of cases the usual approximation is insufficient and consideration of the colliding wave packets is mandatory -see description of the experiments on a single bremsstrahlung at VEPP-4 [8] and at HERA [9] and the review [4]. The same can be stated about discussed processes with the singularities caused by real particles in the intermediate states (t-channel singularities in the physical region).…”

Section: Direct Calculation Of the Number Of Events In ν µ µ + Collismentioning

confidence: 99%

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Physical mechanism of the linear beam-size effect at colliders

1996

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We present qualitative but precise description of the linear beam-size effect predicted for the processes in which unstable but long--living particles collide with each other. We derive physically pronounced equation for the events rate which proves that the linear beam-size effect corresponds to the scattering of one beam of particles on the decay products of the other. We compare this linear beam-size effect with the known logarithmic beam-size effect measured in the experiments on a single bremsstrahlung at VEPP-4 and HERA.Comment: 12 pages, LaTeX, 1 figur

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“…Let us emphasize that the logarithmic beam-size effect has been already established in experiments [8,9]. 3.…”

Section: Discussionmentioning

confidence: 73%

Section: Direct Calculation Of the Number Of Events In ν µ µ + Collismentioning

confidence: 99%

Physical mechanism of the linear beam-size effect at colliders

1996

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“…For the round and identical beams with σ 1⊥ = σ 2⊥ = σ ⊥ the result of (23) can be obtained. 4 The cross section of the µ − µ + → eν e W + reaction Let us analyze a special example taking X = W + . The cross section for the reaction ν µ µ + → W + can be written in the form…”

Section: Derivation Of the Basic Formulamentioning

confidence: 99%

“…[3]). For the first time this beam-size effect (BSE) was observed at the VEPP-4 collider (Novosibirsk) in 1980-81 during the study of the single bremsstrahlung in the electron-positron collisions [4]. This year the BSE was observed at HERA in the reaction ep → epγ [5].…”

Section: Introductionmentioning

confidence: 99%

Processes with a t-channel singularity in the physical region: finite beam sizes make cross sections finite

Melnikov

Serbo

1997

Nuclear Physics B

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It is known that some high-energy processes have a t-channel singularity in the physical region. In this paper we show that this singularity is regularized if one takes into account the finite sizes of the colliding beams, i.e. the realistic situation which takes place at high-energy colliders. On this way we obtain the finite cross section which is linear proportional to the transverse sizes of the colliding beams. As an application of the above result we study the production of the single W boson at µ + µ − colliders in the reaction µ − µ + → eν e W + . For the total energy √ s ≈ 95 GeV and reasonable parameters of the muon beams the "beam-size " dependent part of the cross section for this reaction is of the order of the standard cross section of the µ − µ + → µ −ν µ W + process.

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“…E.g., a description using non-planar waves is necessary in the case of single photon bremsstrahlung discovered in experiments on the e + e − collider VEPP-4 [3,4,5] and then on the ep collider HERA [6]. In these experiments, a remarkable deviation of the measured bremsstrahlung photons from standard calculational methods has been observed.…”

Section: Introductionmentioning

confidence: 99%

Compton upconversion of twisted photons: backscattering of particles with non-planar wave functions

2011

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Abstract. Twisted photons are not plane waves, but superpositions of plane waves with a defined projection m of the orbital angular momentum onto the propagation axis (m is integer and may attain values m ≫ 1). Here, we describe in detail the possibility to produce high-energy twisted photons by backward Compton scattering of twisted laser photons on ultra-relativistic electrons with a Lorentz-factor γ = E/(mec 2 ) ≫ 1. When a twisted laser photon with the energy ω ∼ 1 eV performs a collision with an electron and scatters backward, the final twisted photon conserves the angular momentum m, but its energy ω ′ is increased considerably:, where x = 4E ω/(me c 2 ) 2 . The S matrix formalism for the description of scattering processes is particularly simple for plane waves with definite 4-momenta. However, in the considered case, this formalism must be enhanced because the quantum state of twisted particles cannot be reduced to plane waves. This implies that the usual notion of a cross section is inapplicable, and we introduce and calculate an averaged cross section for a quantitative description of the process. The energetic upconversion of twisted photons may be of interest for experiments with the excitation and disintegration of atoms and nuclei, and for studying the photo-effect and pair production off nuclei in previously unexplored regimes.

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Large impact parameter cut-off in the process e+e−→e+e−γ

Cited by 33 publications

References 3 publications

Physical mechanism of the linear beam-size effect at colliders

Physical mechanism of the linear beam-size effect at colliders

Processes with a t-channel singularity in the physical region: finite beam sizes make cross sections finite

Compton upconversion of twisted photons: backscattering of particles with non-planar wave functions

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