Dihadron Azimuthal Correlation from Collins Effect in Unpolarized Hadron Collisions
Dihadron Azimuthal Correlation from Collins Effect in Unpolarized Hadron Collisions

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Publisher:

Published: 2010

Total Pages: 13

ISBN-13:

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We study the dihadron azimuthal correlation produced nearly back-to-back in unpolarized hadron collisions, arising from the product of two Collins fragmentation functions. Using the latest Collins fragmentation functions extracted from the global analysis of available experimental data, we make predictions for the azimuthalcorrelation of two-pion production in pp collisions at RHIC energies. We find that the correlation is sizable in the mid-rapidity region for moderate jet transverse momentum.

Hadron Interactions,
Hadron Interactions,

Author: P. D. B. Collins

Publisher: CRC Press

Published: 1984

Total Pages: 194

ISBN-13:

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Intended for graduate students, advanced undergraduates and research staff in particle physics and related disciplines and will also be of interest to physicists not working in this field who want an overview of the present development of the subject.

Collins Asymmetry at Hadron Colliders
Collins Asymmetry at Hadron Colliders

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Publisher:

Published: 2008

Total Pages:

ISBN-13:

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We study the Collins effect in the azimuthal asymmetricdistribution of hadrons inside a high energy jet in the single transversepolarized proton proton scattering. From the detailed analysis ofone-gluon and two-gluon exchange diagrams contributions, the Collinsfunction is found the same as that in the semi-inclusive deep inelasticscattering and e+e- annihilations. The eikonal propagators in thesediagrams do not contribute to the phase needed for the Collins-typesingle spin asymmetry, and the universality is derived as a result of theWard identity. We argue that this conclusion depends on the momentum flowof the exchanged gluon and the kinematic constraints in the fragmentationprocess, and is generic and model-independent.

Observation of Charge-dependent Azimuthal Correlations and Possible Local Strong Parity Violation in Heavy-ion Collisions
Observation of Charge-dependent Azimuthal Correlations and Possible Local Strong Parity Violation in Heavy-ion Collisions

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Published: 2010

Total Pages:

ISBN-13:

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Parity-odd domains, corresponding to non-trivial topological solutions of the QCD vacuum, might be created during relativistic heavy-ion collisions. These domains are predicted to lead to charge separation of quarks along the orbital momentum of the system created in non-central collisions. To study this effect, we investigate a three particle mixed harmonics azimuthal correlator which is a?-even observable, but directly sensitive to the charge separation effect. We report measurements of this observable using the STAR detector in Au+Au and Cu+Cu collisions at √s{sub NN} = 200 and 62 GeV. The results are presented as a function of collision centrality, particle separation in rapidity, and particle transverse momentum. A signal consistent with several of the theoretical expectations is detected in all four data sets. We compare our results to the predictions of existing event generators, and discuss in detail possible contributions from other effects that are not related to parity violation.

Ultrarelativistic Heavy-Ion Collisions
Ultrarelativistic Heavy-Ion Collisions

Author: Ramona Vogt

Publisher: Elsevier

Published: 2007-06-04

Total Pages: 489

ISBN-13: 0080525369

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This book is designed for advanced undergraduate and graduate students in high energy heavy-ion physics. It is relevant for students who will work on topics being explored at RHIC and the LHC. In the first part, the basic principles of these studies are covered including kinematics, cross sections (including the quark model and parton distribution functions), the geometry of nuclear collisions, thermodynamics, hydrodynamics and relevant aspects of lattice gauge theory at finite temperature. The second part covers some more specific probes of heavy-ion collisions at these energies: high mass thermal dileptons, quarkonium and hadronization. The second part also serves as extended examples of concepts learned in the previous part. Both parts contain examples in the text as well as exercises at the end of each chapter. - Designed for students and newcomers to the field- Focuses on hard probes and QCD- Covers all aspects of high energy heavy-ion physics- Includes worked example problems and exercises

Perturbative Quantum Chromodynamics
Perturbative Quantum Chromodynamics

Author: A. H. Mueller

Publisher: World Scientific

Published: 1989

Total Pages: 626

ISBN-13: 9789971505646

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This book will be of great interest to advanced students and researchers in the area of high energy theoretical physics. Being the most complete and updated review volume on Perturbative QCD, it serves as an extremely useful textbook or reference book. Some of the reviews in this volume are the best that have been written on the subject anywhere.