Photoproduction of heavy quarks in next-to-leading order QCD with longitudinally polarized initial states

Bojak, Ingo; Stratmann, M.

doi:10.1016/s0550-3213(98)00751-2

Cited by 35 publications

(5 citation statements)

References 61 publications

(141 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only a few processes are known that meet all these requirements. One example is the production of heavy flavours in photon-hadron collisions; the cross section for this process in the case of polarized scattering has recently been computed [1] in QCD at next-to-leading order (NLO). The COMPASS collaboration at CERN [2], and possibly even HERA in the polarized configuration [3], will be able to exploit charm production in order to constrain the polarized gluon density.…”

Section: Introductionmentioning

confidence: 99%

Isolated-photon production in polarized pp collisions

Frixione

Vogelsang

2000

Nuclear Physics B

View full text Add to dashboard Cite

We perform a detailed study of the production of isolated prompt photons in polarized hadronic collisions, in the centre-of-mass energy range relevant to RHIC. We compare the results obtained for a traditional cone-isolation prescription, with those obtained by imposing an isolation condition that eliminates any contribution to the cross section from the fragmentation mechanism. The latter prescription will allow us to present the first fully consistent next-to-leading order calculation in polarized prompt-photon production. We will discuss the theoretical uncertainties affecting the cross section, addressing the issue of the reliability of the perturbative expansion, for both inclusive isolated-photon and photon-plus-jet observables. Finally, we will study the dependence of our predictions upon the polarized parton densities, and the implications for the measurability of the gluon density.

show abstract

Section: Introductionmentioning

confidence: 99%

Isolated-photon production in polarized pp collisions

Frixione

Vogelsang

2000

Nuclear Physics B

View full text Add to dashboard Cite

show abstract

“…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.…”

mentioning

confidence: 99%

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

Boer¹,

Diehl²,

Milner³

et al. 2011

198

291

View full text Add to dashboard Cite

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...

show abstract

“…The (polarized) 6 LiD target consisted of two 60 cm long cells during the years 2002-2004 and of 3 cells with a total length of 120 cm in 2006. The polarization is reversed regularly such that the products of integrated luminosities times acceptance are equal for both polarizations.…”

Section: Methodsmentioning

confidence: 99%

“…The cross-section σ γ * g→cc of this photon-gluon fusion (PGF) process and its dependence on the relative polarization of photon and gluon can be calculated in perturbative QCD [1][2][3][4][5][6][7][8]. Thus, using polarized muons and polarized nucleons, a measurement of the photon nucleon cross-section asymmetry ∆σ γ * N→ccX /σ γ * N→ccX allows the determination of the gluon polarization ∆g/g in the nucleon.…”

Section: Introductionmentioning

confidence: 99%

D ∗ and D meson production in muon nucleon interactions at 160 GeV/c

Adolph¹,

Michigami²,

Wiślicki³

et al. 2012

Eur. Phys. J. C

View full text Add to dashboard Cite

The production of D * and D mesons in inelastic scattering of 160 GeV/c muons off a 6 LiD target has been investigated with the COMPASS spectrometer at CERN for 0.003 (GeV/c) 2 < Q 2 < 10 (GeV/c) 2 and 3 × 10 −5 < x B j < 0.1. The study is based on 8100 events where a D 0 orD 0 is detected subsequently to a D * + or D * − decay, and on 34000 events, where only a D 0 orD 0 is detected. Kinematic distributions of D * , D and K * 2 (1430) are given as a function of their energy E, transverse momentum p T , energy fraction z, and of the virtual photon variables ν, Q 2 and x B j . Semi-inclusive differential D * production cross-sections are compared with theoretical predictions for D * production via photon-gluon fusion into open charm. The total observed production cross-section for D * ± mesons with laboratory energies between 22 and 86 GeV is (1.9 ± 0.4) nb. Significant cross-section asymmetries are observed between D * + and D * − production for ν < 40 GeV and z > 0.6.

show abstract

Photoproduction of heavy quarks in next-to-leading order QCD with longitudinally polarized initial states

Cited by 35 publications

References 61 publications

Isolated-photon production in polarized pp collisions

Isolated-photon production in polarized pp collisions

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

D ∗ and D meson production in muon nucleon interactions at 160 GeV/c

Contact Info

Product

Resources

About