A study of Bhabha scattering at PETRA energies

@article{Braunschweig1988ASO,
  title={A study of Bhabha scattering at PETRA energies},
  author={Wolfgang Braunschweig and Roland Gerhards and F. J. Kirschfink and H. -U. Martyn and P. Rosskamp and B. Bock and H. M. Fischer and Helvi Hartmann and J. L. Hartmann and E. Hilger and Andreas Jocksch and Volker Mertens and R. Wedemeyer and Brian Foster and A. J. Martin and A. J. Sephton and F. Barreiro and E. Bernardi and Janusz Chwastowski and Yehuda Eisenberg and Andrzej Eskreys and Kirsten Gather and Krzysztof Genser and H. Hultschig and P. Joos and Henri Kowalski and Aaron Ladage and B. L{\"o}hr and D. L{\"u}ke and P. M{\"a}ttig and Avram Montag and Dieter Notz and J. M. Pawlak and Evelyne Ronat and Eduardo Ros and Dieter Trines and Teresa Tymieniecka and Roman Walczak and Guenter Wolf and Wolfram Dietrich Zeuner and Hermann Kolanoski and T. Kracht and J. Kr{\"u}ger and Erich Lohrmann and G. Poelz and K. U. P{\"o}snecker and David M. Binnie and J. K. Sedgbeer and J. Shulman and D. Su and A.T. Watson and J Perez Cerezo and M. A. Valdivia Garc{\'i}a and A. Leites and J. Del Peso and J. F. Troc{\'o}niz and C. J. Balkwill and Michael G. Bowler and Philip Nicholas Burrows and Roger J. Cashmore and P. D. Dauncey and Greg P. Heath and Douglas J. Mellor and Peter Ratoff and I. R. Tomalin and J. Yelton and S. L. Lloyd and Geoffrey Ethan Forden and J. C. Hart and D. H. Saxon and Stephanie Brandt and Mark T. Holder and Luis Labarga and Uri Karshon and Giora Mikenberg and Didier Revel and Asaf Shapira and Naor Wainer and G. Yekutieli and Gregory J. Baranko and Allen Caldwell and J. M. Izen and David Robert Muller and Steven M. Ritz and D Strom and M. Takashima and Eric Wicklund and Sau Lan Wu and G. Zobernig and Tasso Collaboration},
  journal={Zeitschrift f{\"u}r Physik C Particles and Fields},
  year={1988},
  volume={37},
  pages={171-177}
}
We report on high statistics Bhabha scattering data taken with the TASSO experiment at PETRA at center of mass energies from 12 GeV to 46.8 GeV. We present an analysis in terms of electroweak parameters of the standard model, give limits on QED cut-off parameters and look for possible signs of compositeness. 
12 Citations
Composite-model view of the llγγ events at LEP
We examine the phenomenological consistency of composite-model pictures for the llγγ events at LEP: the picture with an extra boson and that with an excited lepton. It turns out that the former isExpand
Electron-positron annihilation at high energies
The experimental physics programme of PEP and PETRA is presented. The data from 11 independent experiments are collated according to subject matter and compared with theory. The author starts with aExpand
Search for the substructure of leptons in high energy QED processes at tristan
Abstract QED processes up to O(α 4 ) have been studied at center-of-mass energies between 50 and 57 GeV using the AMY detector at TRISTAN. A possible substructure of the electron and muon isExpand
A measurement of electroweak effects in the reactione+e− → τ+τ− at 35.0 and 42.4 GeV
We report on total cross section and forward backward charge asymmetry measurements of the reactione+e− → τ+τ− at centre of mass energies of 35.0 GeV and 42.4 GeV using the TASSO detector. IncludingExpand
Charge asymmetry of hadronic events in e+e− annihilation at √s=57.9 GeV
Abstract The charge asymmetry of quark jets produced in e + e − annihilations at 〈√ s 〉=57.9 GeV was measured with the TOPAZ detector at TRISTAN. The observed charge asymmetry isExpand
Dimension-6 gluon operators as probes of new physics
Abstract We study dimension-6 gluonic operators, which would be the low-energy manifestations of either a gluon form factor or a new colored particle. Finding evidence of these operators inExpand
First observation of the Top Quark at the Large Hadron Collider
This thesis presents the measurement of the top quark pair production cross section in the CMS detector at the CERN Large Hadron Collider (LHC). At LHC, the top quark is produced predominantlyExpand
Experimental constraints on extra dimensions
Abstract We investigate the implications for experiment of the existence of compactified dimensions with a scale much larger than the Planck length. Such manifolds might occur in certain stringExpand
A measurement of muon pair production ine+e− annihilation at centre of mass energies 35.0≤ $$\sqrt s $$ ≤46.8 GeV
The reactione+e−→µ+µ− has been studied at centre of mass energies between 35.0 and 46.8 GeV using the TASSO detector at PETRA. We present measurements of the forward-backward charge asymmetry (Aμμ)Expand
Limits on extra dimensions in orbifold compactifications of superstrings
Abstract Perturbative breaking of supersymmetry in four-dimensional string theories predict in general the existence of new large dimensions at the TeV scale. Such dimensions can be consistent withExpand
...
1
2
...

References

SHOWING 1-7 OF 7 REFERENCES
An improved measurement of electroweak couplings frome+e−→e+e− ande+e−→μ+μ−
We present an analysis of electroweak leptonic couplings from high statistics experiments on Bhabha scattering and μ pair production at an energy of 34.5 GeV. The forward-backward charge asymmetry ofExpand
New Tests for Quark and Lepton Substructure
If quarks and leptons are composite at the energy scale ..lambda.., the strong forces binding their constituents induce flavor-diagonal contact interactions, which have significant effects atExpand
Multiple bremsstrahlung in gauge theories at high energies (II). Single bremsstrahlung
We calculate the helicity amplitudes for the QED processes e+e−→γγγ, μ+μ−γ, and e+e−γ, in the limit of vanishing fermion masses. This is done by introducing explicit polarization vectors for theExpand
The production and decay of Tau leptons ine+e− annihilation at PETRA energies
We have observed τ pair production at average CM energies of 13.9, 22.3, 34.5 and 43.1 GeV. The cross-sections are consistent with QED, the cut off parameters beingΛ+>161 GeV andΛ−169 GeV (95% CL).Expand
Coupling strengths of weak neutral currents from leptonic final states at 22 and 34 GeV
AbstractDifferential cross sections fore+e−→e+e−, τ+, τ- measured with the CELLO detector at $$\left\langle {\sqrt s } \right\rangle = 34.2GeV$$ have been analyzed for electroweak contributions.Expand
Detailed W0 effects in e+e− → e+e−
Abstract The predicted cross section for the reaction e + e − →e + e − is presented assuming one photon and W 0 exchange. Pure W 0 terms and the W 0 width are included.
Partial Symmetries of Weak Interactions
Weak and electromagnetic interactions of the leptons are examined under the hypothesis that the weak interactions are mediated by vector bosons. With only an isotopic triplet of leptons coupled to aExpand