Comparison of inelastic electron and positron scattering cross sections on 12C and 27Al

Hartwig, Sabina; Heimlich, F. H.; Huber, G.; Rössle, E.; Bleckwenn, J.; Köbberling, M.; Moritz, J.; Schmidt, K.; Wegener, D.; Zeller, D.; David, Peter; Mommsen, Hans

doi:10.1016/0370-2693(79)90760-3

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…The simpler measurements were performed in Refs. [29][30][31][32][33][34][35] and experiment II of Ref. [36] where a single arm magnetic spectrometers detects the scattered lepton.…”

Section: A Elastic Scatteringmentioning

confidence: 99%

“…Here N is a number attributed to each point, following a sequential order from Refs. [31] (solid squares, black), [29] (triangles, magenta), [36] (triangles down, green), [39] (open circles, blue), [37] (open square, magenta), [30] (open triangles, cyan), [38] (open lozenges, dark blue) [40] (open crosses, red), [35] (stars), [33] (open stars, blue), [32] (asterisks, magenta).…”

Section: Compilation Of E ± + P Scattering Data a Elastic Scatteringmentioning

confidence: 99%

“…In the kinematic conditions of the experiment [35], one should note that the scattering angle is very small (ǫ ∼ 1), as well as Q 2 . In these kinematical conditions soft photon Here N is a number attributed to each point, following a sequential order from Refs.…”

Section: B Inelastic Scatteringmentioning

confidence: 99%

“…In these kinematical conditions soft photon Here N is a number attributed to each point, following a sequential order from Refs. [31] (solid squares, black), [45] (triangles, red), [46]-H target (triangles down, green), [46]-D target (open circles, blue), [35]- 12 C target (open squares, magenta), [35]- 27 Al target (open triangles, cyan), [34] (open lozenges, black), [47] (open crosses, red).…”

Section: B Inelastic Scatteringmentioning

confidence: 99%

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Compilation and analysis of charge asymmetry measurements from electron and positron scattering on nucleon and nuclei

et al. 2013

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20 pages, 7 figures 2 tablesWorld data on the lepton-charge asymmetry in the elastic and inelastic lepton scattering off the proton and nuclei are compiled and discussed. After reviewing the published results, we compare the elastic data to a model calculation of the two-photon exchange mechanism. We show that the existing data do not provide any evidence for the two-photon contribution. At significance level 0.05 the data allow to exclude the two-photon exchange as an explanation for the difference between Rosenbluth and polarization measurements of proton electromagnetic form factors

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“…The simpler measurements were performed in Refs. [29][30][31][32][33][34][35] and experiment II of Ref. [36] where a single arm magnetic spectrometers detects the scattered lepton.…”

Section: A Elastic Scatteringmentioning

confidence: 99%

Section: Compilation Of E ± + P Scattering Data a Elastic Scatteringmentioning

confidence: 99%

Section: B Inelastic Scatteringmentioning

confidence: 99%

Section: B Inelastic Scatteringmentioning

confidence: 99%

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Compilation and analysis of charge asymmetry measurements from electron and positron scattering on nucleon and nuclei

et al. 2013

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“…Up to now, experimental searches have been mainly performed in elastic lepton-nucleon scattering, where non-zero transverse-beam SSAs of order 10 −5 − 10 −6 have been measured [4]. In inelastic scattering, no clear indication of two-photon exchange has yet been observed, where various attemps of measuring both transverse-target SSAs [6,7,8] and cross-section ratio [9,10,11,12,13,14,15] show no effect within the few-percent level. No experimental search has been done in deep-inelastic scattering (DIS) to date.…”

Section: Introductionmentioning

confidence: 99%

Search for a Two-Photon Exchange Contribution in inclusive DIS at sc hermes

Ruiz¹

2009

Proceedings of the XVII International Workshop on Deep-Inelastic Scattering and Related Topics

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The transverse-target single-spin asymmetry for inclusive deep-inelastic scattering with effectively unpolarized electron and positron beams off a transversely polarized hydrogen target was measured, with the goal of searching for a two-photon exchange signal in the kinematic range 0.004 < x < 0.9 and 0.1 GeV 2 < Q 2 < 20 GeV 2. In two separate regions Q 2 > 1 GeV 2 and Q 2 < 1 GeV 2 , and for both electron and positron beams, the asymmetries are found to be consistent with zero within statistical and systematic uncertainties, which are of order 10 −3 for the overall asymmetries.

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Interference of Electromagnetic and Weak Interactions at High Energies and Neutral-Current μe Universality

Klein

1985

Fortschr. Phys.

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A review is given on three types of experiments which recently detected the interference of electromagnetic and weak interactions a t high energies in the reactions eD, -+ eX (SLAG, 1979), e+e--+ p+p-(PETRA/PEP, 1981 -83) and p*C --f p*X (BCDMS, 1982). Asymmetry formulae are explicitely derived using the quark-parton model and the S U ( 2 ) x U(1) standard theory. With particular emphasis on the deep inelastic muon scattering experiment, the corresponding experiments are described and their results summarized. Combined fits to the 1983 asymmetry and ve data verify completely the muon-electron universality of the weak neutral current interaction giving for the vector and axial-vector coupling constants we = 0.02 & 0.06, aB = -0.54 & 0.03 (electrons) and v,, = -0.05 & 0.16, a , = -0.51 & 0.05 (muons).Recently, a n experimental programme could be completed which was first discussed about 25 years ago. I n a short note it was pointed out by ZELDOVICH in 1959 [l] that there should exist an interference between the electromagnetic and weak interactions 1 Fortschr. Phys. 33 (1985) 7 376 M. KLEIN, Interference of Electromagnetic and Weak Interactions provided the weak interaction Lagrangian contains a neutral-current term (j5 Op) (e Oe), similarly to the / 3 decay [2] term (F Op) (e Ov). Parity violation in the electron-proton interaction was predicted to occur due to the pseudoscalar term in 0 = yp(l -7 1~) .Assuming the neutral current to be of the same strength as the charged one, i.e. proportional to G = 10-5mp2, Zeldovich estimated the magnitude of the interference to bei CQ2/e2 = 0(10-4Q2/(GeV/~)2), i.e. about .Ol% of the purely electromagnetic contribution a t a niomentuni transfer Q2 N l(GeV/c)2. It is interesting to recall that the first convincing evidence for electroweak interference effects came from the 1979 SLAC eD scattering experiment [3] measuring a parity violation asymmetry of about -.Ol% at a Q 2 of just ~l ( G e V / c )~. The Q2 domain, in which electroweak effects in lepton-nucleon interactions were observed, has been extended down to lower values Q 2 N l/RZto,,, by the experiments searching for parity violation in atoms [a, 51 and up to Q2 = 100(GeV/c)Z by an experiment with polarized muons [6].At about the same time it was realized that similar interference phenomena should occur in electron-positron scattering. The discussion of e+e-physics began in 1960, in particular a t Stanford, Frascati and Novosibirsk, with the desire to test QED free froni complications due to strong interactions. Reviewing issues for e+e-experiments, CA-BIBBO and GATTO [7] briefly discussed the possible existence of a weak neutral current contribution to the production amplitude for e+e---f p+p-. Using again the Fermi constant G from f3 decay they correctly estimated the size of the resulting interference contribution noting that "effects will be large only for E b e a m > 10 GeV" [7]. It took many generations of e+e-machines to reach that energy a t PETRA/PEP and indeed detect the interference [8] at an energy s (or corr...

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Comparison of inelastic electron and positron scattering cross sections on 12C and 27Al

Abstract: The ratio R "'o+/oof the cross sections for inelastic positron and electron scattering on 12 c and 27 Al has bPen mcasu!'ed for four momentum

Cited by 9 publications

References 8 publications

Compilation and analysis of charge asymmetry measurements from electron and positron scattering on nucleon and nuclei

Compilation and analysis of charge asymmetry measurements from electron and positron scattering on nucleon and nuclei

Search for a Two-Photon Exchange Contribution in inclusive DIS at sc hermes

Interference of Electromagnetic and Weak Interactions at High Energies and Neutral-Current μe Universality

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