Jet production in polarized lepton-hadron scattering

Mirkes, E.; Ziegler, C.

doi:10.1016/s0550-3213(94)80043-x

Cited by 5 publications

(3 citation statements)

References 22 publications

(35 reference statements)

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“…The asymmetry signal increases only for a few points around x > 0.1, since a lower incident energy probes slightly higher values of x [437,239].…”

Section: High P T Jets In High Energy Lepton Nucleon Collisionsmentioning

confidence: 96%

“…A natural scale for multi-jet production in DIS may be µ 2 R = µ 2 F = 1/4 ( j p B T (j)) 2 , with the average p B T (j) being defined in the Breit frame by 2 E 2 j (1 − cos θ jP ), where the subscripts j and P denote the jet and proton. Results about this cross section including HO effects can be found in [437,239]. If the jets are defined in a modified JADE scheme, the theoretical uncertainties of the two-jet cross section can be very large due to higher order effects.…”

Section: High P T Jets In High Energy Lepton Nucleon Collisionsmentioning

confidence: 99%

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Spin physics and polarized structure functions

2000

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A review on the theoretical aspects and the experimental results of polarized deep inelastic scattering and of other hard scattering processes is presented. The longitudinally polarized structure functions are introduced and cross section fromulae are given for the case of photon as well as W ± and Z 0 exchange. Results from the SLAC and CERN polarization experiments are shown and compared with each other as well as their implications for the integrated g 1 (x, Q 2 ) are reviewed. More recent experiments presently underway (like HERMES at DESY) and future projects (like RHIC at BNL, HERA-N and a polarized HERA collider at DESY) are discussed too. The QCD interpretation and the LO and NLO Q 2 -evolution of g 1 , i.e. of the longitudinally polarized parton densities, is discussed in great detail, in particular the role of the polarized gluon density, as well as the expectations for x → 0. Particular emphasis is placed on the first moment of the polarized structure function in various factorization schemes, which is related to the axial anomaly, and on its relevance for understanding the origin of the proton spin. Sum rules (i.e. relations between moments of the structure functions) are derived and compared with recent experimental results. Various other phenomenological applications are discussed as well, in particular the parametrizations of polarized parton densities as obtained from recent data and their evolution in Q 2 . Furthermore, jet, heavy quark and direct photon production are reviewed as a sensitive probe of the polarized gluon density, and the physics prospects of the future polarized experiments at RHIC ( p p) and a polarized HERA collider ( e p) are studied. DIS semi-inclusive asymmetries and elastic neutrino-proton scattering are reviewed, which will help to disentangle the various polarized flavor densities in the nucleon. The status of single and double spin asymmetries, and the observation of handedness in the final state, are discussed as well. Structure 1 functions for higher spin hadrons and nuclei are defined and possible nuclear effects on high energy spin physics are reviewed. The theoretical concept of spin-dependent parton distributions and structure functions of the polarized photon is presented and possibilities for measuring them are briefly discussed. Various nonperturbative approaches to understand the origin of the proton spin are reviewed, such as the isosinglet U A (1) Goldberger-Treiman relation, lattice calculations and the chiral soliton model of the nucleon. The physical interpretation and model calculations of the transverse structure function g 2 are presented, as well as recent twist-3 measurements thereof, and the Burkhardt-Cottingham sum rule is revisited. Finally, the physics of chiral-odd 'transversity' distributions is described and experimental possibilities for delineating them are reviewed, which will be important for a complete understanding of the leading twist-2 sector of the nucleon's parton structure. In the Appendix the full 2-loop anomalous dimension...

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“…The asymmetry signal increases only for a few points around x > 0.1, since a lower incident energy probes slightly higher values of x [437,239].…”

Section: High P T Jets In High Energy Lepton Nucleon Collisionsmentioning

confidence: 96%

Section: High P T Jets In High Energy Lepton Nucleon Collisionsmentioning

confidence: 99%

Spin physics and polarized structure functions

2000

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“…Current determinations of ∆g suffer from both a limited x coverage and fairly large theoretical scale ambiguities in polarized pp collisions for inclusive (di)jet [146,147] and pion production [148,149]. Several channels are sensitive to ∆g in ep scattering at collider energies such as DIS jet [150,151] or charm [152,153,154] production but QCD scaling violations in inclusive polarized DIS have been identified as the golden measurement.The inclusive structure function g 1 (x, Q 2 ) is the most straightforward probe in spin physics and has been determined in various fixed-target experiments at medium-to-large values of x in the last two decades. It is also the best understood quantity from a theoretical point of view.…”

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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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Dijet production at HERA in next-to-leading order

Mirkes

Zeppenfeld²

1996

Physics Letters B

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Two-jet cross sections in deep inelastic scattering at HERA are calculated in next-to-leading order. The QCD corrections are implemented in a new ep → n jets event generator, MEPJET, which allows to analyze arbitrary jet definition schemes and general cuts in terms of parton 4-momenta. First results are presented for the JADE, the cone and the k T schemes. For the W -scheme, disagreement with previous results and large radiative corrections and recombination scheme dependencies are traced to a common origin.

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Jet production in polarized lepton-hadron scattering

Cited by 5 publications

References 22 publications

Spin physics and polarized structure functions

Spin physics and polarized structure functions

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

Dijet production at HERA in next-to-leading order

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