Accessing the longitudinally polarized photon content of the proton

Mukherjee, A.; Pisano, Cristian

doi:10.1103/physrevd.70.034029

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…In fact, a significant photon content of the proton is well confirmed in the so-called Deep Inelastic Compton Scattering (DICS, see Refs. [21][22][23][24][25][26] and Fig. 3).…”

Section: Light Sea Fermionsmentioning

confidence: 87%

Light sea fermions in electron-proton and muon-proton interactions

Jentschura

2013

Phys. Rev. A

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The proton radius conundrum [R. Pohl et al., Nature 466, 213 (2010) and A. Antognini et al. Science 339, 417 (2013)] highlights the need to revisit any conceivable sources of electron-muon nonuniversality in lepton-proton interactions within the Standard Model. Superficially, a number of perturbative processes could appear to lead to such a nonunversality. One of these is a coupling of the scattered electron into an electronic as opposed to a muonic vacuum polarization loop in the photon exchange of two valence quarks, which is present only for electron projectiles as opposed to muon projectiles. However, we can show that this effect actually is part of the radiative correction to the proton's polarizability contribution to the Lamb shift, equivalent to a radiative correction to double scattering. We conclude that any conceivable genuine nonuniversality must be connected with a nonperturbative feature of the proton's structure, e.g., with the possible presence of light sea fermions as constituent components of the proton. If we assume an average of roughly 0.7 × 10 −7 light sea positrons per valence quark, then we can show that virtual electron-positron annihiliation processes lead to an extra term in the electron-proton versus muon-proton interaction, which has the right sign and magnitude to explain the proton radius discrepancy.

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“…In fact, a significant photon content of the proton is well confirmed in the so-called Deep Inelastic Compton Scattering (DICS, see Refs. [21][22][23][24][25][26] and Fig. 3).…”

Section: Light Sea Fermionsmentioning

confidence: 87%

Light sea fermions in electron-proton and muon-proton interactions

Jentschura

2013

Phys. Rev. A

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“…At HERA energies, σ EPA inel = 3.64 × 10 −2 pb, 3.51 × 10 −2 pb and 3.07 × 10 −2 pb for Q 2 max =ŝ, −û and −t, respectively. In the following we will fix the scale to beŝ, in analogy to our previous studies about the QED Compton scattering process in ep → eγX [2,4,5]. In [4,5] it was suggested that the experimental selection of only those events for whichŝ > Q 2 restricts the kinematics of the process to the region of validity of the EPA and improves the extraction the equivalent photon distribution from the exact cross section.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The polarized and unpolarized photon distributions of the nucleon, evaluated in the EPA, have been computed theoretically [1] and the possibility of their experimental determination has also been demonstrated [2,3,4,5]. Both of them consist of two components, an elastic one, due to N → γN, and an inelastic one, due to N → γX, with X = N. The reliability of the EPA remains, however, to be studied.…”

Section: Introductionmentioning

confidence: 99%

Testing the equivalent photon approximation of the proton in the process $ep \rightarrow \nu W X$

Pisano

2004

Eur. Phys. J. C

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The accuracy of the equivalent photon approximation (EPA) of the proton in describing the inelastic process ep → νW X is investigated. In particular, the scale dependence of the corresponding inelastic photon distribution is discussed. Furthermore, an estimate of the total number of events, including the ones coming from the elastic and quasi-elastic channels of the reaction, is given for the HERA collider.

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Probing the polarized photon content of the proton in ep collisions at the EIC

Rein,

Schlegel,

Vogelsang

2024

Phys. Rev. D

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We study the single-inclusive production of prompt photons in electron-proton collisions, ep→γX, for kinematics relevant at the Electron-Ion Collider (EIC). We perform a perturbative calculation of the differential cross section to next-to-leading order in QCD and to lowest order in QED. We consider unpolarized collisions as well as scattering of longitudinally polarized incident electrons and protons. We show that the cross sections are sensitive to the parton distribution functions of photons inside the proton, which we find to generate the dominant contributions in certain kinematical regions at the EIC. We also investigate the effects of photon isolation on the unpolarized and polarized cross sections. Published by the American Physical Society 2024

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Accessing the longitudinally polarized photon content of the proton

Cited by 3 publications

References 29 publications

Light sea fermions in electron-proton and muon-proton interactions

Light sea fermions in electron-proton and muon-proton interactions

Testing the equivalent photon approximation of the proton in the process $ep \rightarrow \nu W X$

Probing the polarized photon content of the proton in ep collisions at the EIC

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