Publications (43)94.08 Total impact

Dataset: IJMP TESLA 2004
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ABSTRACT: High energy photon colliders (γγ, γe) are based on e^e^ linear colliders where high energy photons are produced using Compton scattering of laser light on high energy electrons just before the interaction point. This paper is a part of the Technical Design Report of the linear collider TESLA. Physics program, possible parameters and some technical aspects of the photon collider at TESLA are discussed. Published in Int.J.Mod.Phys. A19, Issue 30 (2004) 50975186; Comments: 102 pages, 41 figures, editor: V. Telnov Journal reference: Int.J.Mod.Phys.A19:50975186,2004 DOI: 10.1142/S0217751X04020737 Report number: DESY 2001011, ECFA 2001209 Cite as: arXiv:hepex/0108012 or http://arxiv.org/abs/hepex/0108012International Journal of Modern Physics A 12/2004; 19(30):50975186. · 1.13 Impact Factor 
Article: Higgs selfcoupling in γγ collisions
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ABSTRACT: To establish the Higgs mechanism experimentally, one has to determine the Higgs selfinteraction potential responsible for the electroweak symmetry breaking. This requires a measurement of the trilinear and quadrilinear selfcouplings of the Higgs particle, as predicted by the standard model. We propose that the trilinear Higgs selfcoupling be measured in the process γγ→HH just above the kinematic threshold of 2MH, where MH is the Higgs mass. Our calculation shows that the statistical sensitivity of the cross section σγγ→HH to the Higgs selfcoupling is maximal near the 2MH threshold for MH between 115 and 150 GeV, and is larger than the statistical sensitivities of σe+e→ZHH and σe+e→νν̅ HH to this coupling for 2Ee≤700 GeV.Physical Review D 10/2004; 70(7). · 4.69 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The TESLA Technical Design Report Part III: Physics at an e+e Linear Collider07/2001;  [Show abstract] [Hide abstract]
ABSTRACT: We review the most important topics and objectives of the physics program of the collider (photon collider) option for an e+e− linear collider.Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 04/2001; · 1.14 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We present analytical results for the leading contributions of the top quark to the electroweak ρ parameter at order GF3Mt6 and GF2Mt4αs. The Higgs boson and the gauge bosons are taken to be massless in this limit. The correction of order GF3Mt6 is found to be sizeable in comparison to the the leading twoloop correction, however it is much smaller than the subleading correction.Physics Letters B 01/2001; · 4.57 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We review the nexttoleadingorder crosssections of the heavy quark–antiquark pair production in linearly polarized photon–photon collision. Implications for the signal of Higgs particles are discussed.Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 01/2001; 472(1):155159. · 1.14 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We present analytical results for the leading contributions of the top quark to the electroweak rho parameter at order GF^3 Mt^6 and GF^2 Mt^4 alpha_s. The Higgs boson and the gauge bosons are taken to be massless in this limit. The correction of order GF^3 Mt^6 is found to be sizeable in comparison to the the leading twoloop GF^2 Mt^4 correction, however it is much smaller than the subleading GF^2 Mt^2 MZ^2 correction. Comment: 10 pages, 2 figures, Latex. v2: two minor corrections in the references. Accepted for publication in Phys. lett. B. The complete paper is also available via the www at http://wwwttp.physik.unikarlsruhe.de/Preprints/11/2000;  [Show abstract] [Hide abstract]
ABSTRACT: We have studied the production of a light Higgs boson with a mass of 120 GeV in photonphoton collisions at a Compton collider. The event generator for the backgrounds to a Higgs signal due to and heavy quark pair production in polarized γγ collisions is based on a complete nexttoleading order (NLO) perturbative QCD calculations. For Jz = 0 the large doublelogarithmic corrections up to four loops are also included. It is shown that the twophoton width of the Higgs boson can be measured with high statistical accuracy of about 2% for integrated γγ luminosity in the hard part of the spectrum of 40 fb−1. As a result the total Higgs boson width can be calculated in a model independent way to an accuracy of about 14%.Nuclear Physics B  Proceedings Supplements 03/2000; · 0.88 Impact Factor 
Article: Physics at Linear Colliders
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ABSTRACT: Introduction As it is well known, there are several ways to generate photonphoton collisions at linear e + e Gamma colliders. Bremsstrahlung and/or beamstrahlung photons radiated by the incoming electrons will interact with a center of mass energy which is only a small fraction of the available e + e Gamma energy. These collisions are a nuisance for studies in electroweak interactions as they reduce the available e + e Gamma luminosity at a given energy and generate an important hadronic background. Much work is going on to reduce this component. However it will be seen that this mechanism can be used to understand the deep structure of the photon. On the other hand, dedicated photon linear colliders can be constructed using backward Compton scattering of a beam electron on a laser photon, which will yield a photonphoton energy similar to the<F13.5402/2000;  [Show abstract] [Hide abstract]
ABSTRACT: Linear colliders offer a unique opportunity to study γγ and γe interactions. Using the laser backscattering method one can obtain γγ, γe colliding beams with an energy and luminosity comparable to that in e+e− collisions. This work is part of the Conceptual Design of TESLA/SBLC linear colliders considering a second interaction region for γγ and γe collisions. We consider here possible physics in highenergy γγ, γe collisions, e→γ conversion, requirements to lasers, collision schemes, attainable luminosities, backgrounds, possible lasers, optics at the interaction region and other associated problems.Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 03/1998; · 1.14 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: The twoloop corrections to the electroweak gauge boson quartic couplings, growing quadratically with the Higgs boson mass, are calculated in the Standard Model in the limit of large Higgs mass. The corrections to WWWW, WWZZ and ZZZZ fourvertices are found to be an order of magnitude larger than the twoloop mH2 corrections to light fermion and triple gauge boson vertices. For a heavy Higgs boson with a mass around 1 TeV the corrections are at the several percent level and in principle could be observed experimentally.Nuclear Physics B 01/1998; · 4.33 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: We study the resonance production of new particles at LinacRing type ep and g p colliders.Turkish Journal of Physics. 01/1998;  [Show abstract] [Hide abstract]
ABSTRACT: The processes of electroweak gauge boson production in high energy photonphoton collisions are surveyed.11/1997;  [Show abstract] [Hide abstract]
ABSTRACT: Recent progress in calculating O(alpha) electroweak corrections to W+W pair production in photonphoton collisions is reviewed. The potential of the Photon Linear Collider to study anomalous W couplings is discussed. Comment: Talk given at 5th International conference on physics Beyond the Standard Model, Balholm, Norway, April 29  May 4, 1997, 6 pages, 2 Postscript figures, uses epsf.sty08/1997;  [Show abstract] [Hide abstract]
ABSTRACT: The physics prospects of the high energy Photon Linear Collider are reviewed, emphasizing its potential to study the symmetry breaking sector, including Higgs searches and precision anomalous W couplings measurements.07/1997;  [Show abstract] [Hide abstract]
ABSTRACT: We calculate renormalization constants ZH,w, the Higgs and Wboson mass and tadpole counterterms in the onmassshell renormalization scheme to two loops in the heavyHiggsboson limit mH ⪢ MW. Explicit analytic formulae are presented for the twoloop integrals with masses, which are not known in the literature. As an application, the analytic expression for the twoloop leading correction to the fermionic Higgs boson width is obtained.Physics Letters B 01/1997; · 4.57 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: Full (α) electroweak corrections for γγ → W+W− are calculated including virtual corrections, soft and hard real photon and Zboson emission. The corrections are quite large ranging from −2.5% at 500 GeV to −18% at 2 TeV,  cos θ± < cos(10°). Contributions from real photon and Zboson emission are important at high energies where they partly cancel large negative contributions originating from virtual bosonic corrections. Precision measurements that intend to uncover physics beyond the standard model must necessarily make use of the full standard model predictions including (α) corrections.Nuclear Physics B 01/1997; · 4.33 Impact Factor 
Article: Electroweak O(alpha) Corrections to W+W Pair Production in Polarized gammagamma Collisions
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ABSTRACT: Full O(alpha) electroweak corrections for gammagamma> W+W are calculated including virtual corrections, soft and hard real photon and Zboson emission. The corrections are quite large ranging from 2.5% at 500 GeV to 18% at 2 TeV, cos\theta^\pm < cos(10^\circ). Contributions from real photon and Zboson emission are important at high energies where they partly cancel large negative contribution originating from virtual bosonic corrections. Precision measurements that intend to uncover physics beyond the standard model must necessarily make use of the full standard model predictions including O(alpha) corrections. Comment: 23 pages, 9 Postscript figures, uses epsfig.sty12/1996;  [Show abstract] [Hide abstract]
ABSTRACT: Perturbative QCD oneloop corrections to the cross sections of the bb¯(cc¯) quark pair production in polarized photonphoton collisions, as well as cross sections of the radiative processes gammagamma>bb¯g, cc¯g, leading to two and threejet final states are calculated. It is shown that the signal from the intermediatemass Higgs boson is observable and precise measurements of the Higgs boson twophoton width are possible at a photonphoton collider, although the statistical significance is substantially reduced with respect to the treelevel calculations. We demonstrate that virtual corrections are of the same order as or larger than the Born contribution in the Jz=0 channel at high energy for small values of the cutoff ycut separating twojet from threejet topologies. The nature of these large corrections is elucidated. For bb¯ pair production at &surd;sgammagamma~100 GeV and for small values of ycutPhysical review D: Particles and fields 09/1996; 54(3):20302042.
Publication Stats
876  Citations  
94.08  Total Impact Points  
Top Journals
Institutions

1998–2004

Universität Freiburg
 Faculty of Mathematics and Physics
Freiburg, Lower Saxony, Germany


1990–1997

Институт физики высоких энергий
Protvino, Moskovskaya, Russia


1994

Moscow Institute of Physics and Technology
Moskva, Moscow, Russia
