Electroweak asymmetry in deep inelastic muon-nucleon scattering

Argento, A.; Benvenuti, A. C.; Bollini, D.; Camporesi, T.; Heiman, G.; Monari, L.; Navarria, F. L.; Bozzo, M.; Brun, R.; Gennow, H.; Goossens, Michel; Kopp, R.; Nowak, W.-D.; Piemontese, L.; Pilcher, J. E.; Schinzel, D.; Vesztergombi, G.; Burdin, D. Yu.; Cvach, J.; Fadeev, N.G.; Golutvin, I.; Kiryushin, Yu.T.; Kisselev, Viatcheslav; Klein, M.; Kondor, A.; Krivokhizhin, V.G.; Kukhtin, V.; Savin, I.; Smirnov, G.I.; Todorov, Plamen; Volodko, A.; Žáček, J.; Jamnik, D.; Meyer‐Berkhout, U.; O’Connor, J. Michael; Staude, A.; Teichert, K. M.; Tirler, R.; Voss, R.; Wojcicki, S. G.; Zupančič, Č.; Cribier, M.; Dobrowolski, T.; Feltesse, J.; Rich-Hennion, P.; Milsztajn, A.; Renardy, J. F.; Sacquin, Y.; Smadja, G.; Verrecchia, P.; Virchaux, M.

doi:10.1016/0370-2693(83)90665-2

Cited by 84 publications

(29 citation statements)

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“…Superimposed in fig. 5.13 are two curves showing the potential change of B(z) due to a 0.3% error on the incoming energy (magnetic field), respectively [6]. Clearly, there is no indication for any systematic error occuring at this level.…”

Section: Kleinmentioning

confidence: 97%

“…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.…”

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confidence: 99%

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confidence: 99%

“…4 and [21, Na]) and iv) muoncarbon scattering (sect. 5, [6]). Whenever possible, the statistical and the systematic errors have been added in quadrature.…”

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confidence: 99%

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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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Section: Kleinmentioning

confidence: 97%

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confidence: 99%

mentioning

confidence: 99%

“…4 and [21, Na]) and iv) muoncarbon scattering (sect. 5, [6]). Whenever possible, the statistical and the systematic errors have been added in quadrature.…”

mentioning

confidence: 99%

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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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“…(36) is valid for isoscalar targets and neglects s quarks, c quarks, and anti-quarks. The only experiment to date which has measured a charge-conjugation cross section asymmetry [129,130], was the CERN µ ± C scattering experiment [131]. In this experiment, the µ-polarization, λ, was reserved simultaneously with the µ-charge.…”

Section: Quantitymentioning

confidence: 99%

Low energy tests of the weak interaction

Erler

Ramsey-Musolf

2005

Progress in Particle and Nuclear Physics

107

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The study of low energy weak interactions of light quarks and leptons continues to provide important insights into both the Standard Model as well as the physics that may lie beyond it. We review the status and future prospects for low energy electroweak physics. Recent important experimental and theoretical developments are discussed and open theoretical issues are highlighted. Particular attention is paid to neutrino physics, searches for permanent electric dipole moments, neutral current tests of the running of the weak mixing angle, weak decays, and muon physics. We argue that the broad range of such studies provides an important complement to high energy collider searches for physics beyond the Standard Model. The use of low energy weak interactions to probe novel aspects of hadron structure is also discussed.

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Review of Deep Inelastic Charged Lepton Scattering

Nowak

1986

Fortschr. Phys.

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The present situation in deep inelastic lepton-nucleon scattering is reviewed from an experimenter's point of view . After describing. in some detail. the quark-parton model (QPM) predictions the basic ideas of Quantum Chromodynamics (QCD) are illustrated . The perturbative QCD predictions for deep inelastic scattering are summarised discussing also their theoretical uncertainties of today .Past and present experiments on deep inelastic electron and muon scattering are compared regarding their ability to test these predictions . It is shown that all data is in very good agreement with the QPM and fully consistent with perturbative QCD . New results on lepton scattering off nuclei are discussed and confronted to recently invented phenomenological models .

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Electroweak asymmetry in deep inelastic muon-nucleon scattering

Abstract: At the CERN SPS we have measured a deep inelastic μ± cross section asymmetry at momentum transfers Q2 ranging from 15 to 180GeV2. The result is in quantitative agreement with the WS/GIM standard electroweak model and allows to determine the muon neutral current couplings

Cited by 84 publications

References 16 publications

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

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

Low energy tests of the weak interaction

Review of Deep Inelastic Charged Lepton Scattering

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