Beyond the Standard Model at HERA

Spiesberger, H.

doi:10.1007/3-540-46522-7_33

Cited by 3 publications

(8 citation statements)

References 33 publications

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“…The presently available numerical programs for the calculation of the CC cross section do not all take into account the complete set of one-loop and one-photon corrections described above. Two programs with the complete set of O(α) corrections (DISEPW [38] and epcctot [45]) have been compared in the HERA workshop [37] and found to agree well except in the phase space corners of small x, small y or large x, all y. These programs are, however, not very well-suited for an application to realistic experiments since they do not allow to apply experimental cuts and, secondly, since they are restricted to the use of leptonic variables whereas experiments have to use hadronic variables.…”

Section: Numerical Results and Discussion Of Uncertaintiesmentioning

confidence: 99%

“…As discussed in much detail in the literature [37], the differential cross section for NC scattering when measured in terms of electron variables receives QED corrections which are large and negative at small y e and large x e , whereas at large y e and small x e large positive corrections may reach the level of 100%. These corrections can be reduced, sometimes considerably, with measurements based on hadronic or mixed kinematic variables.…”

Section: Electroweak Radiative Correctionsmentioning

confidence: 99%

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High-Q²deep inelastic scattering at HERA

Cooper-Sarkar¹,

Bodek²,

Long³

et al. 1999

J. Phys. G: Nucl. Part. Phys.

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Abstract. High Q 2 NC and CC cross sections as measured at HERA can give information on two distinct areas of current interest. Firstly, supposing that all the electroweak parameters are well known, these cross-sections may be used to give information on parton distribution functions (PDFs) in the new kinematic regime at high x and high Q 2 . Secondly, supposing that PDFs are well known after evolution in Q 2 from the kinematic regime where they are already measured, these cross-sections may be used to give information on electroweak parameters in a process where the exchanged boson is 'spacelike' rather than 'timelike'. WG1 addressed itself to clarifying the limits of our present and possible future knowledge on both these points.

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Section: Numerical Results and Discussion Of Uncertaintiesmentioning

confidence: 99%

Section: Electroweak Radiative Correctionsmentioning

confidence: 99%

High-Q²deep inelastic scattering at HERA

Cooper-Sarkar¹,

Bodek²,

Long³

et al. 1999

J. Phys. G: Nucl. Part. Phys.

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“…The reduction of the radiative corrections is considerable at largest y and at small x B , but probably not yet sufficient at larger values of x B . From similar studies for electron-nucleus scattering at HERA [1277,1278,1274], one can expect to obtain a much stronger reduction of radiative corrections, if more refined prescriptions for the measurement of kinematic variables are found. Since the determination of the true structure functions requires an iterative unfolding procedure, it is important to show that the radiative corrections do not depend too strongly on the assumed input structure functions.…”

Section: Radiative Correctionsmentioning

confidence: 97%

“…The interference of radiation from the lepton and the quark is small [1277]. In certain phase space regions one may expect higher than one-photon corrections to be important.…”

Section: × 130 (Au)mentioning

confidence: 99%

Gluons and the quark sea at high energies: distributions, polarization, tomography

Boer¹,

Diehl²,

Milner³

et al. 2011

198

291

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ForewordThe study of the fundamental structure of nuclear matter is a central thrust of physics research in the United States. As indicated in Frontiers of Nuclear Science, the 2007 Nuclear Science Advisory Committee long range plan, consideration of a future Electron-Ion Collider (EIC) is a priority and will likely be a significant focus of discussion at the next long range plan. We are therefore pleased to have supported the ten week program in fall 2010 at the Institute of Nuclear Theory which examined at length the science case for the EIC. This program was a major effort; it attracted the maximum allowable attendance over ten weeks.This report summarizes the current understanding of the physics and articulates important open questions that can be addressed by an EIC. It converges towards a set of "golden" experiments that illustrate both the science reach and the technical demands on such a facility, and thereby establishes a firm ground from which to launch the next phase in preparation for the upcoming long range plan discussions. We thank all the participants in this productive program. In particular, we would like to acknowledge the leadership and dedication of the five co-organizers of the program who are also the co-editors of this report.David Kaplan, Director, National Institute for Nuclear Theory Hugh Montgomery, Director, Thomas Jefferson National Accelerator Facility Steven Vigdor, Associate Lab Director, Brookhaven National Laboratory iii Preface This volume is based on a ten-week program on "Gluons and the quark sea at high energies", which took place at the Institute for Nuclear Theory (INT) in Seattle from September 13 to November 19, 2010. The principal aim of the program was to develop and sharpen the science case for an Electron-Ion Collider (EIC), a facility that will be able to collide electrons and positrons with polarized protons and with light to heavy nuclei at high energies, offering unprecedented possibilities for in-depth studies of quantum chromodynamics. Guiding questions were• What are the crucial science issues?• How do they fit within the overall goals for nuclear physics?• Why can't they be addressed adequately at existing facilities?• Will they still be interesting in the 2020's, when a suitable facility might be realized?The program started with a five-day workshop on "Perturbative and Non-Perturbative Aspects of QCD at Collider Energies", which was followed by eight weeks of regular program and a concluding four-day workshop on "The Science Case for an EIC".More than 120 theorists and experimentalists took part in the program over ten weeks. It was only possible to smoothly accommodate such a large number of participants because of the extraordinary efforts of the INT staff, to whom we extend our warm thanks and appreciation. We thank the INT Director, David Kaplan, for his strong support of the program and for covering a significant portion of the costs for printing this volume. We gratefully acknowledge additional financial support provided by BNL and JLab.The program w...

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“…[20] and references therein). In this case the emitted photon remains undetected and singularities due to soft and collinear photons have to be canceled by taking into account virtual O(α) corrections to non-radiative scattering eq → eq.…”

Section: The Leading-order Processmentioning

confidence: 99%