Total and Partial Photoproduction Cross Sections at 1.44, 2.8, and 4.7 GeV

Ballam, J.; Chadwick, G. B.; Gearhart, R.; Guiragossián, Z.G.T.; Klein, P.; Levy, A.; Menke, M.; Murray, Joseph J.; Seyboth, P.; Wolf, G.; Sinclair, C. K.; Bingham, H. H.; Fretter, W. B.; Moffeit, K. C.; Podolsky, W. J.; Rabin, M. S. Z.; Rosenfeld, Arthur H.; Windmolders, R.

doi:10.1103/physrevlett.23.498

Cited by 102 publications

(23 citation statements)

References 6 publications

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“…With much improved photon yields (100-500 s −1 ), Ballam et al [7] at the Stanford Linear Accelerator Center (SLAC) were able to carry out the first physics measurements using the Compton γ -ray beam to study the photo-production cross sections at several GeVs with a hydrogen bubble chamber. In 1978 the first γ -ray Compton light source facility for nuclear physics research, the Ladon project, was brought to operation in Frascati [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…In 1963, Milburn, and Arutyunian and Tumanian, independently proposed a method of producing very high energy γ -ray beams via Compton back-scattering of photons with high-energy electrons in charged particle accelerators [2,3]. In the following years, the first experimental demonstrations of high energy γ -ray production using Compton scattering were carried out by several groups around the world, including Kulikov et al with the 600 MeV synchrotron [4], Bemporad et al with the 6.0 GeV Cambridge Electron Accelerator [5], and Ballam et al with the 20 GeV Stanford linear accelerator [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Research opportunities at the upgraded HIγS facility

Weller

Ahmed

et al. 2009

Progress in Particle and Nuclear Physics

413

253

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research opportunities at the upgraded HIγS facility

Weller

Ahmed

et al. 2009

Progress in Particle and Nuclear Physics

413

253

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“…The fact that a high energy electron loses a large fraction of its energy in collisions with an optical photon was realized a long time ago in astrophysics [165]. The method of generation of high energy γ-quanta by Compton scattering of the laser light on relativistic electrons has been proposed soon after lasers were invented [166,167] and has already been used in many laboratories for more than 35 years [168,169]. In first experiments the conversion efficiency of electron to photons k = N γ /N e was very small, only about 10 −7 [169].…”

Section: 1 Compton Scatteringmentioning

confidence: 99%

“…The method of generation of high energy γ-quanta by Compton scattering of the laser light on relativistic electrons has been proposed soon after lasers were invented [166,167] and has already been used in many laboratories for more than 35 years [168,169]. In first experiments the conversion efficiency of electron to photons k = N γ /N e was very small, only about 10 −7 [169]. At linear colliders, due to small bunch sizes one can focus the laser to the electron beam and get k ≈ 1 at rather moderate laser flash energy, about 1-5 J. Twenty years ago when photon colliders were proposed [1,2] such flash energies could already be obtained but with a low rate 1 and a pulse duration longer than is necessary.…”

Section: 1 Compton Scatteringmentioning

confidence: 99%

The Photon Collider at Tesla

Badełek

Blöchinger

Blümlein³

et al. 2004

Int. J. Mod. Phys. A

144

126

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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.1Physics program, possible parameters and some technical aspects of the photon collider at TESLA are discussed.

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“…With the help of the backscattered laser technique [12,13], a luminosity L,, = 5 x cmP2 sP1 and center-of-mass energy E,, = 1 TeV might be obtained [14] in future e+e-colliders [15]. In a one-year-long experiment (integrated luminosity 150 fb-l) about 7000 Z Z events could be detected after eliminating the WW background as explained in [4].…”

mentioning

confidence: 99%

W-boson-loop versus ultraheavy-fermion-loop contributions to the processγγ→ZZ

Bajc

1993

Phys. Rev. D

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The computation of the cross section for yy + Z Z to one-loop order in the standard model with mHi,,. = 100 GeV shows that the W-loop contribution dominates the unpolarized cross section. A signal of a hypothetical fourth family of ultraheavy particles could be detected at energies below the fourth-family mass only if both final Z are longitudinal. The mass, however, could not be determined because the results are insensitive to its value. PACS number(s): 12.15.Ji, 12.15.Ff, 13.10.+q In the minimal standard electroweak model [l] the known fermions are grouped in three families and the neutrinos are treated as massless. However, no symmetry principle forbids massive Dirac neutrinos and/or other families. Experimental data fix the number of different light (m, << M z ) neutrinos to three [2], but allow a fourth family of leptons and quarks if it contains %early degenerate" multiplets of ultraheavy particles [3].The very high energy needed for direct production of these particles makes its potential detection difficult also a t future colliders. For this reason Chanowitz [4] has recently proposed to detect such hypothetical in the process yy + Z Z at energies much larger than the top quark mass, but yet lower than the mass of the fourth generation fermions. The idea is based on the fact that the contribution to the cross section of the light families is decreasing like 11s in this energy range, while the contribution of the fourth family with ultraheavy fermions is growing like s. The computation [4] is incomplete, because the Wloop contribution was neglected. The purpose of this Rapid Communication is to fill the gap in [4], calculating also the W-loop contribution to the amplitude in the context of the minimal standard model with one Higgsboson doublet [I]. Some of the Feynman diagrams with one loop contributing to yy + Z Z are shown in Fig. 1.They can be divided into four groups. The first contains graphs with one loop formed by the gauge bosons W * , the "would-be Goldstone bosons" q5* and the ghosts c*, -ci, but without any Higgs-boson line (first row in Fig. 1-84 graphs), the second with one W k , di, ci, loop and a Higgs-boson propagator in the s channel (second row-14 graphs), the third with one fermion loop and no Higgs-boson lines (third row-3 graphs), and the last with one fermion loop and a Higgs boson in the s channel (fourth row-1 graph). The complete set of Feynman diagrams belonging to the first group can be found in [5] (with ZZyy external lines instead of Zyyy). The graphs for the vertex H y y at one-loop order, which form, with the H propagator in the s channel and the vertex H Z 2 a t the tree level, the diagrams of the second group, can be found in [6]. The calculation was done in the 't HooftFeynman gauge. A computer package for symbolical calculation of Feynman graphs, written in SMP, was used to obtain analytic expressions of all the Feynman diagrams. The so-obtained expressions for some diagrams are very long. The first diagram shown in Fig. 1 alone has 608 terms, for example. Each ...

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Total and Partial Photoproduction Cross Sections at 1.44, 2.8, and 4.7 GeV

Cited by 102 publications

References 6 publications

Research opportunities at the upgraded HIγS facility

Research opportunities at the upgraded HIγS facility

The Photon Collider at Tesla

W-boson-loop versus ultraheavy-fermion-loop contributions to the processγγ→ZZ

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