[Show abstract][Hide abstract] 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) 5097-5186;
Comments: 102 pages, 41 figures, editor: V. Telnov
Journal reference: Int.J.Mod.Phys.A19:5097-5186,2004
Report number: DESY 2001-011, ECFA 2001-209
Cite as: arXiv:hep-ex/0108012 or http://arxiv.org/abs/hep-ex/0108012
International Journal of Modern Physics A 12/2004; 19(30):5097-5186. DOI:10.1142/S0217751X04020737 · 1.70 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: To establish the Higgs mechanism experimentally, one has to determine the Higgs self-interaction potential responsible for the electroweak symmetry breaking. This requires a measurement of the trilinear and quadrilinear self-couplings of the Higgs particle, as predicted by the standard model. We propose that the trilinear Higgs self-coupling 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 self-coupling 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). DOI:10.1103/PhysRevD.70.073017 · 4.64 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We review the next-to-leading-order cross-sections 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 10/2001; 472(1):155-159. DOI:10.1016/S0168-9002(01)01175-5 · 1.22 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 G(F)(3)M(t)(6) and G(F)(2)M(t)(4)alpha (s). The Higgs boson and the gauge bosons are taken to be massless in this limit. The correction of order G(F)(3)M(t)(6) is found to be sizeable in comparison to the the leading two-loop O(G(F)(2)M(t)(4)) correction, however it is much smaller than the kubleading O(G(F)(2)M(t)(2)M(Z)(2)) correction. (C) 2001 Published by Elsevier Science B.V.
Physics Letters B 01/2001; 498(3-4-498):156-162. DOI:10.1016/S0370-2693(01)00002-8 · 6.13 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We have studied the production of a light Higgs boson with a mass of 120 GeV in photon-photon 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 next-to-leading order (NLO) perturbative QCD calculations. For Jz = 0 the large double-logarithmic corrections up to four loops are also included. It is shown that the two-photon 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%.
[Show abstract][Hide abstract] ABSTRACT: Introduction As it is well known, there are several ways to generate photon-photon 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 photon-photon energy similar to the<F13.54
[Show abstract][Hide abstract] ABSTRACT: The two-loop 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 four-vertices are found to be an order of magnitude larger than the two-loop 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 06/1998; 520(1-2-520):31-50. DOI:10.1016/S0550-3213(98)00200-4 · 3.93 Impact Factor
[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 high-energy 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; 406(1-406):13-49. DOI:10.1016/S0168-9002(97)01183-2 · 1.22 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Recent progress in calculating O(alpha) electroweak corrections to W+W- pair production in photon-photon 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.sty
[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.
[Show abstract][Hide abstract] ABSTRACT: Full (α) electroweak corrections for γγ → W+W− are calculated including virtual corrections, soft and hard real photon and Z-boson 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 Z-boson 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 06/1997; 494(1-2-494):19-40. DOI:10.1016/S0550-3213(97)00170-3 · 3.93 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: We calculate renormalization constants ZH,w, the Higgs and W-boson mass and tadpole counterterms in the on-mass-shell renormalization scheme to two loops in the heavy-Higgs-boson limit mH ⪢ MW. Explicit analytic formulae are presented for the two-loop integrals with masses, which are not known in the literature. As an application, the analytic expression for the two-loop leading correction to the fermionic Higgs boson width is obtained.
Physics Letters B 01/1997; 391(3-4-391):434-440. DOI:10.1016/S0370-2693(96)01546-8 · 6.13 Impact Factor