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Unique Description For Single Transverse Spin Asymmetries In Dis And Hadronic Collisions
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Book Synopsis UNIQUE DESCRIPTION FOR SINGLE TRANSVERSE SPIN ASYMMETRIES IN DIS AND HADRONIC COLLISIONS. by : F. YUAN
Download or read book UNIQUE DESCRIPTION FOR SINGLE TRANSVERSE SPIN ASYMMETRIES IN DIS AND HADRONIC COLLISIONS. written by F. YUAN and published by . This book was released on 2006 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We derive a unique formula for the single-transverse-spin asymmetry in semi-inclusive hadron production in deep inelastic scattering, valid for all transverse momentum region. Based on this, we further study the integrated asymmetry weighted with transverse-momentum. They can be evaluated in terms of the twist-three quark-gluon correlation functions, which are responsible for the single spin asymmetry in single inclusive hadron production in hadronic collisions. By using the fitted twist-three functions from the hadronic collision data, we find a consistent description for SSAs in deep inelastic scattering. This demonstrates that we have a unique picture for SSAs in these two processes, and shall provide important guidelines for future studies.
Book Synopsis Transverse Spin Physics by : Dr. Vincenzo Barone
Download or read book Transverse Spin Physics written by Dr. Vincenzo Barone and published by World Scientific. This book was released on 2003 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study deals with the theory and phenomenology of transverse spin effects in high-energy hadronic physics. Contrary to common past belief, it is now rather clear that these effects are far from irrelevant. A decade or so of intense theoretical work has shed much light on the subject and brought to the surface an entire class of new phenomena, which now await thorough experimental investigation. Over the next few years a number of experiments worldwide (at DESY, CERN and Brookhaven) will run with transversely polarised particles, providing data that will enrich our knowledge of the transverse spin structure of hadrons. The principle aim of this work is to assess the state of the art as it stands in 2002. After a few introductory remarks (Chapter 1), in the first part (Chapters 2-4) attention is directed to polarised deep inelastic scattering (DIS), particularly DIS on transversely polarised targets, which probes the transverse spin structure function g2. This structure function is examined within the framework of the quark-parton model and its improvement via perturbative QCD. The existing data are reviewed and commented on (for completeness and comparison, a brief presentation of longitudinally polarised DIS and of the helicity structure of the proton is provided). The second part of the book (Chapters 5-8) focuses on the transverse polarisation of quarks, the so-called "transversity". The partonic content and the QCD evolution of the transversity distributions are presented in detail. The phenomenology of transversity is then studied in the context of Drell-Yan processes and of semi-inclusive lepto- and hadroproduction. The interpretation of data on single-spin asymmetries is discussed and, finally, the prospects for future measurements are reviewed.
Book Synopsis Collins Mechanism Contributions to Single Spin Asymmetry by :
Download or read book Collins Mechanism Contributions to Single Spin Asymmetry written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present recent developments on the single transverse spin physics, in particular, the Collins mechanism contributions in various hadronic reactions, such as semi-inclusive hadron production in DIS process, azimuthal distribution of hadron in high energy jet in pp collisions. We will demonstrate that the transverse momentum dependent and collinear factorization approaches are consistent with each other in the description of the Collins effects in the semi-inclusive hadron production in DIS process.
Book Synopsis Measurement of Single Transverse Spin Asymmetry Via Single Hadrons and Di-hadron Correlations in the 200GeV P + P Collision in the PHENIX Experiment at RHIC by : Feng Wei
Download or read book Measurement of Single Transverse Spin Asymmetry Via Single Hadrons and Di-hadron Correlations in the 200GeV P + P Collision in the PHENIX Experiment at RHIC written by Feng Wei and published by . This book was released on 2010 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Single Spin Asymmetries of Identified Hadrons in P +p at Square Root S by :
Download or read book Single Spin Asymmetries of Identified Hadrons in P +p at Square Root S written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of x{sub F}-dependent single spin asymmetries of identified charged hadrons, [pi]{sup {+-}}, K{sup {+-}}, p, and {bar p}, from transversely polarized proton collisions at √s = 200 and 62.4 GeV at RHIC are presented. The energy and flavor dependent asymmetry measurements bring new insight into the fundamental mechanisms of transverse spin asymmetries and Quantum Chromodynamical description of hadronic structure.
Book Synopsis Transverse Spin Observables in Hadron-hadron and Hadron-nucleus Collisions by :
Download or read book Transverse Spin Observables in Hadron-hadron and Hadron-nucleus Collisions written by and published by . This book was released on 1991 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transverse, single-spin asymmetries offer a chance to test QCD at the level of twist-3'' observables. Early suggestions that such asymmetries necessarily vanish as m{sub q} → 0 or involve an extra power of [alpha]{sub s} can be refuted with a simple example. Recent experimental results support the interpretation of these data in hard-scattering QCD. The asymmetry in the scattering on nuclear targets can provide new, nontrivial information the space-time structure of the interaction. 10 refs., 6 figs.
Book Synopsis Proceedings of the 17th International Spin Physics Symposium by : Kenichi Imai
Download or read book Proceedings of the 17th International Spin Physics Symposium written by Kenichi Imai and published by American Inst. of Physics. This book was released on 2007-07-02 with total page 1196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Getting down to the bottom line is what this proceedings digest is all about, as any physicist will tell you: spin is the fundamental concept in physics. The applications are pretty universal due to the fact that, using spin-related phenomena, physicists are trying to reveal the fundamental principles of nature – and things don’t come much more bottom-line than that. This volume is the proceedings of the 17th International Spin Physics Symposium which is a forum to discuss spin physics and related topics.
Book Synopsis Next-to-Leading Order Calculation of the Single Transverse Spin Asymmetry in the Drell-Yan Process by :
Download or read book Next-to-Leading Order Calculation of the Single Transverse Spin Asymmetry in the Drell-Yan Process written by and published by . This book was released on 2009 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: We calculate the next-to-leading order perturbative QCD corrections to the transverse momentum weighted single transverse spin asymmetry in Drell-Yan lepton pair production in hadronic collisions. We identify the splitting function relevant for the scale evolution of the twist-three quark-gluon correlation function. We comment on the consequences of our results for phenomenology.
Book Synopsis PROCEEDINGS OF RIKEN BNL RESEARCH CENTER WORKSHOP ENTITLED ''SINGLE SPIN ASYMMETRIES'' (VOLUME 75). by :
Download or read book PROCEEDINGS OF RIKEN BNL RESEARCH CENTER WORKSHOP ENTITLED ''SINGLE SPIN ASYMMETRIES'' (VOLUME 75). written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Single-transverse spin asymmetries (SSA) in strong interactions have a long history, starting from the 1970s and 1980s when surprisingly large single-transverse spin asymmetries were observed in p+p [yields] [pi]X and pp [yields] [Lambda] + X, where really none were expected. They have again attracted much interest in recent years from both experimental and theoretical sides. In particular, first measurements by the STAR, PHENIX, and BRAHMS collaborations at RHIC have now become available which again reveal large single transverse spin asymmetries for hadron production in polarized proton proton scattering. This extends the SSA observations from the fixed target energy range to the collider regime. Meanwhile, experimental studies in Deep Inelastic Scattering by the HERMES collaboration at DESY, SMC at CERN, and CLAS at JLab also show a remarkably large SSA in semi-inclusive hadron production, [gamma]*p [yields] [pi]X, when the proton is transversely polarized. On the theoretical side, there are several approaches to understanding SSA within Quantum Chromodynamics (QCD). For example, to explain the large SSAs for hadron production in hadron collisions, a mechanism that takes into account the contribution from quark-gluon-quark correlations (twist-3) in the nucleon was proposed. On the other hand, possible origins of SSA in DIS and hadronic scattering were also found in leading-twist transverse momentum dependent parton distributions. Current theoretical efforts aim at a better conceptual understanding of these two types of mechanisms, and of their connections. We were very happy at this timely date to bring together the theorists and experimentalists of this field to review and discuss the current theoretical status and the latest experimental results. The whole workshop contained 25 formal talks, both experiment (15) and theory (10), and a few informal talks and many fruitful discussions. The topics covered all the relevant SSA observables, including in Deep Inelastic Scattering, the Drell-Yan process, and in inclusive hadron production and dijet correlations at hadron colliders. There were not only discussions on possible interpretations of the existing SSA data, but also on the future observables for the ongoing experiments as well as for planned experiments (such as RHIC II and eRHIC). On the theory side, the talks ranged from overviews and descriptions of the fundamental aspects of SSAs, to presentations of detailed phenomenological studies. All of the talks attracted much interest and initiated active discussions. Directions for future measurements were pointed out, in particular for studies at RHIC. Also, significant theoretical advances were made that may tie together some of the currently proposed mechanisms for single-spin asymmetries. This was a very successful workshop. It stimulated many discussions and new collaborations.
Book Synopsis Transverse Single-spin Asymmetries by :
Download or read book Transverse Single-spin Asymmetries written by and published by . This book was released on 2014 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, transverse single-spin asymmetries are among the most intriguing observables in hadronic physics. Though such asymmetries were already measured for the first time about four decades ago, their origin is still under debate. Here we consider transverse single-spin asymmetries in semi-inclusive lepton-nucleon scattering, in nucleon-nucleon scattering, and in inclusive lepton-nucleon scattering. It is argued that, according to recent work, the single-spin asymmetries for those three processes may be simultaneously described in perturbative QCD, where the re-scattering of the active partons plays a crucial role. A comparison of single-spin asymmetries in different reactions can also shed light on the universality of transverse momentum dependent parton correlation functions. In particular, we discuss what existing data may tell us about the predicted process dependence of the Sivers function.
Book Synopsis Transversity 2005 by : Dr. Vincenzo Barone
Download or read book Transversity 2005 written by Dr. Vincenzo Barone and published by World Scientific. This book was released on 2006 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: The notion of transversity in hadronic physics has been with us for over 25 years. Intriguing though it might have been, for much of that time transversity remained an intangible and remote object, of interest principally to a few theoreticians. In recent years transversity and transverse-spin effects in general have grown as both theoretical and experimental areas of active research. This increasing attention has now matured into a thriving field with a driving force of its own. The ever-growing bulk of data on asymmetries in collisions involving transversely polarised hadrons demands a more solid and coherent theoretical basis for its description. Indeed, it now appears rather clear that transversity and other closely related properties play a significant role in such phenomena.As part of a Ministry-funded inter-university Research Project, this workshop was organised to gather together experimentalists and theoreticians engaged in investigating the nature of transverse spin in hadronic physics, with the intent of favouring the exchange of up-to-date theoretical and experimental ideas and news on the subject. Over 70 physicists took part and very nearly all the major experiments involved in transverse-spin studies were officially represented, as too were the main theory groups working in the field. New results and new analyses sparked many interesting and lively discussions.
Book Synopsis Exploring the Structure of Hadrons Through Spin Asymmetries in Hard Scattering Processes by : Daniel Pitonyak
Download or read book Exploring the Structure of Hadrons Through Spin Asymmetries in Hard Scattering Processes written by Daniel Pitonyak and published by . This book was released on 2013 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: Almost all of the visible matter in the universe is built from strongly interacting particles known as hadrons. For example, protons and neutrons, which comprise the nucleus of an atom, fit into this class of particles. However, hadrons are not a fundamental form of matter in that they are composed of other particles collectively called partons. One of the main challenges we face is to understand this internal structure. In the past, focus was placed mainly on reactions that involved so-called collinear twist-2 two-parton correlators. Even though these functions provide valuable access to the interior of hadrons, they present us with only a 1-dimensional and, hence, incomplete view of this complex world. In recent years, two extensions of this formalism have become an active source of research: transverse momentum dependent (TMD) functions and three-parton correlations. The former allow us to obtain a 3-dimensional image of hadrons (in momentum space), while the latter give us insight into the rich interactions that occur inside of them, and the two are closely connected. In this dissertation we analyze spin asymmetries in hard scattering processes, which address both types of functions, in order to understand the parton dynamics that cause these phenomena and to determine what these observables reveal about the inner-workings of hadrons. Namely, we analyze (almost back-to-back) di-hadron production in electron-positron annihilation as well as discuss momentum sum rules for some of the associated TMD functions. We also investigate transverse single-spin asymmetries in lepton-nucleon and proton-proton collisions. The study of the former allows us to comment on the general role of parton re-scattering in such effects, while a discussion of the latter includes a new computation of an important piece to that observable. Furthermore, we present pioneering calculations on longitudinal-transverse double-spin asymmetries in nucleon-nucleon collisions.
Book Synopsis Probing Nucleons And Nuclei In High Energy Collisions - Proceedings Of The Int Program Int-18-3 by : Alexei Prokudin
Download or read book Probing Nucleons And Nuclei In High Energy Collisions - Proceedings Of The Int Program Int-18-3 written by Alexei Prokudin and published by World Scientific. This book was released on 2020-05-29 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains proceedings of the 7-week INT program dedicated to the physics of the Electron-Ion Collider (EIC), the world's first polarized electron-nucleon (ep) and electron-nucleus (eA) collider to be constructed in the United States. The 2015 NSAC Long Range Plan recommended EIC as the 'highest priority for new facility construction following the completion of FRIB'. The primary goal of the EIC is to establish precise multi-dimensional imaging of quarks and gluons inside nucleons and nuclei. This includes (i) understanding the spatial and momentum space structure of the nucleon through the studies of TMDs (transverse-momentum-dependent parton distributions), GPD (generalized parton distributions) and the Wigner distribution; (ii) determining the partonic origin of the nucleon spin; (iii) exploring the new quantum chromodynamics (QCD) frontier of ultra-strong gluon fields, with the potential to seal the discovery of a new form of dense gluon matter predicted to exist in all nuclei and nucleons at small Bjorken x — the parton saturation.The program brought together both theorists and experimentalists from Jefferson Lab (JLab), Brookhaven National Laboratory (BNL) along with the national and international nuclear physics communities to assess and advance the EIC physics.
Book Synopsis Forward Di-hadron Asymmetries from P + P at 8́(s by : James Lucas Drachenberg
Download or read book Forward Di-hadron Asymmetries from P + P at 8́(s written by James Lucas Drachenberg and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One unresolved question in hadronic physics is the origin of large transverse single-spin asymmetries, AN, observed in hadron production from high-energy polarized-proton collisions. Collinear perturbative Quantum Chromodynamics (pQCD) predicts that AN should scale with the quark mass, however, experiments have since reported large AN for inclusive hadron production. Recent measurements from RHIC experiments show examples of these asymmetries at forward angles in a kinematic region where pQCD cross-section calculations reasonably agree with measured cross-sections. Disentangling dynamical contributions to AN from hadro-production requires moving beyond inclusive measurements. One possibility is to investigate asymmetries in two-particle correlations due to Interference Fragmentation Functions (IFF) and the Sivers effect. In 2008, RHIC dedicated a portion of the run to transversely polarized proton collisions at sqrt(s) = 200 GeV. STAR was equipped with a Foward Meson Spectrometer (FMS) and a Forward Time Projection Chamber (FTPC), overlapping in the pseudorapidity range of 2.5 eta & lt; 4. By analyzing neutral pions with the FMS correlated with charged particles from the FTPC, correlation asymmetries can be measured at kinematics where large inclusive asymmetries have been measured. Correlations are measured for pi^0's with 2 & lt; pT, pi^0 & lt; 5 GeV/c and associated charged particles in two ranges of transverse momentum: 1 & lt; pT, ch & lt; 2 GeV/c and 0.5 & lt; pT, ch & lt; 1 GeV/c. IFF and Sivers asymmetries manifest themselves through the correlation of two particles from the same jet. These events are selected through a cut on the pair radius, delta R. Gain non-uniformities and electronics failures have resulted in large holes in trigger acceptance and associated particle acceptance, respectively. This non-uniform acceptance allows the Sivers and IFF effects to mix and distort the raw asymmetries. Techniques are developed to measure this leak-through by means of unpolarized yields and event weighting. They result in small corrections to the asymmetries. IFF and Sivers asymmetries both for xF 0 and for xF & lt; 0 are reported for forward-angle pi^0-charged particle correlations from polarized-proton collisions at sqrt(s) = 200 GeV. Asymmetries are shown corrected for full underlying-event and pileup backgrounds, as well as corrected only for pile-up contributions. It appears the asymmetries are less sensitive to delta R when corrected for the full underlying-event background. Unfortunately, statistics limitations preclude a firm conclusion.
Book Synopsis Unvail the Mysterious of the Single Spin Asymmetry by :
Download or read book Unvail the Mysterious of the Single Spin Asymmetry written by and published by . This book was released on 2010 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Single transverse-spin asymmetry in high energy hadronic reaction has been greatly investigated from both experiment and theory sides in the last few years. In this talk, I will summarize some recent theoretical developments, which, in my opinion, help to unvail the mysterious of the single spin asymmetry.
Book Synopsis Transverse Spin Asymmetries in Neutral Strange Particle Production by : Thomas Burton
Download or read book Transverse Spin Asymmetries in Neutral Strange Particle Production written by Thomas Burton and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The origin of the quantum mechanical spin of the proton in terms of its constituents is not yet fully understood. The discovery that the intrinsic spin of quarks contributes only a small fraction of the total proton spin sparked a huge theoretical and experimental effort to understand the origin of the remainder. In particular the transverse spin properties of the proton remain poorly understood. Significant transverse spin asymmetries in the production of hadrons have been observed over many years, and are related to both the transverse polarisation of quarks in a transversely polarised proton and to the spin dependence of orbital motion. These asymmetries are of interest because of perturbative QCD predictions that such asymmetries should be small. Measurements of such asymmetries may yield further insights into the transverse spin structure of the proton. The Relativistic Heavy Ion Collider (RHIC) is the world s first polarised proton collider, and has been taking proton data since 2001. Polarised proton collisions at \(\sqrt{s}\) = 200 GeV taken during the 2006 RHIC run have been analysed and the transverse single and double spin asymmetries in the production of the neutral strange particles \(K 0_S\), \(\Lambda\) and \(\overline{\Lambda}\) have been measured in the transverse momentum range 0.5
Book Synopsis Single Hadronic-Spin Asymmetries in Weak Interaction Processes by :
Download or read book Single Hadronic-Spin Asymmetries in Weak Interaction Processes written by and published by . This book was released on 2002 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: We show that measurements of single-spin asymmetries (SSAs) in charged current weak interaction processes such as deep inelastic neutrino scattering on a polarized target and inclusive W production in polarized hadron-hadron collisions discriminate between the two fundamental QCD mechanisms (the Sivers and Collins effects) which have been proposed to explain such time-reversal-odd asymmetries. It has recently been shown that QCD final-state interactions due to gluon exchange between the struck quark and the proton spectators in semi-inclusive deep inelastic lepton scattering will produce non-zero Sivers-type single-spin asymmetries which survive in the Bjorken limit. We show that this QCD final-state interaction produces identical SSAs in charged and neutral current reactions. Furthermore, the contribution of each quark to the SSA from this mechanism is proportional to the contribution of that quark to the polarized baryon's anomalous magnetic moment. In contrast, the Collins effect contribution to SSAs depends on the transversity distribution of quarks in the polarized target. Since the charged current only couples to quarks of one chirality, it cannot sense the transversity distribution of the target, and thus it gives no Collins-type contribution to single-spin correlations.
