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Double Transverse Spin Asymmetries At Nlo
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Book Synopsis DOUBLE TRANSVERSE SPIN ASYMMETRIES AT NLO. by : A.STRATMANN MUKHERJEE (M.VOGELSANG, W.)
Download or read book DOUBLE TRANSVERSE SPIN ASYMMETRIES AT NLO. written by A.STRATMANN MUKHERJEE (M.VOGELSANG, W.) and published by . This book was released on 2003 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a next-to-leading order QCD calculation of the cross section and the spin asymmetry for isolated large-p{sub T} prompt photon production in collisions of transversely polarized protons. Corresponding measurements may be used at RHIC to determine the transversity parton distributions of the proton.
Book Synopsis DOUBLE TRANSVERSE SPIN ASYMMETRIES AT NEXT-TO-LEADING ORDER IN QCD. by : W. VOGELSANG
Download or read book DOUBLE TRANSVERSE SPIN ASYMMETRIES AT NEXT-TO-LEADING ORDER IN QCD. written by W. VOGELSANG and published by . This book was released on 2004 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a technique to calculate the cross sections and spin asymmetries for transversely polarized pp collisions at NLO in QCD and report on the use of this technique for the processes p{up_arrow}p{up_arrow} {yields} {gamma}X, p{up_arrow}p{up_arrow} {yields} {pi}X and p{up_arrow}p{up_arrow} {yields} {ell}{sup +}{ell}{sup -} X.
Book Synopsis DOUBLE TRANSVERSE SPIN ASYMMETRIES AT NEXT-TO-LEADING ORDER IN QCD. by :
Download or read book DOUBLE TRANSVERSE SPIN ASYMMETRIES AT NEXT-TO-LEADING ORDER IN QCD. written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a technique to calculate the cross sections and spin asymmetries for transversely polarized pp collisions at NLO in QCD and report on the use of this technique for the processes p[up-arrow]p[up-arrow] [yields] [gamma]X, p[up-arrow]p[up-arrow] [yields] [pi]X and p[up-arrow]p[up-arrow] [yields] [ell][sup +][ell][sup -] X.
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 Transverse Spin Physics by : Vincenzo Barone
Download or read book Transverse Spin Physics written by Vincenzo Barone and published by World Scientific. This book was released on 2003-01-29 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to the theory and phenomenology of transverse-spin effects in high-energy hadronic physics. Contrary to common past belief, it is now rather clear that such effects are far from irrelevant. A decade or so of intense theoretical work has shed much light on the subject and brought to surface an entire class of new phenomena, which now await thorough experimental investigation. Over the next few years a number of experiments world-wide (at BNL, CERN, DESY and JLAB) will run with transversely polarised beams and targets, providing data that will enrich our knowledge of the transverse-spin structure of hadrons. It is therefore timely to assess the state of the art, and this is the principal aim of the volume.An outline of the book is as follows. After a few introductory remarks (Chapter 1), attention is directed in Chapter 2 to transversely polarised deeply-inelastic scattering (DIS), which probes the transverse spin structure function g2. This existing data are reviewed and discussed (for completeness, a brief presentation of longitudinally polarised DIS is also provided). In Chapter 3 the transverse-spin structure of the proton is illustrated in detail, with emphasis on the transversity distribution and the twist-three parton distribution contributing to g2. Model calculations of these quantities are also presented. In Chapter 4, the QCD evolution of transversity is studied at leading and next-to-leading order. Chapter 5 illustrates the g2 structure function and its related sum rules within the framework of perturbative QCD. The last three chapters are devoted to the phenomenology of transversity, in the context of Drell-Yan processes (Chapter 6), inclusive leptoproduction (Chapter 7) and inclusive hadroproduction (Chapter 8). The interpretation of some recent single-spin asymmetry data is discussed and the prospects for future measurements are reviewed.
Book Synopsis Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized p + p Collisions at √s = 200 GeV by : Katsuro Nakamura
Download or read book Longitudinal Double-Spin Asymmetry of Electrons from Heavy Flavor Decays in Polarized p + p Collisions at √s = 200 GeV written by Katsuro Nakamura and published by Springer. This book was released on 2014-05-21 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, the measurement of double-spin asymmetry for electron production from heavy flavor decays was performed in a Relativistic Heavy Ion Collider (RHIC) in the PHENIX experiment at Brookhaven National Laboratory to measure the polarized parton distribution function of gluon in the small Bjorken x region (x~0.01). For this experiment, for the first time a Hadron Blind Detector (HBD), which is a position-sensitive gas Cherenkov counter with Gas Electron Multiplier whose surface is evaporated by CsI, was employed. This HBD contributes to reducing the background from electron pairs produced by real and virtual photon conversion. Furthermore, the author develops a new analysis method for the background reduction, and the signal-to-background ratio is improved by a factor of roughly 2.0. Using the combination of the HBD and a new analysis method, the double-spin asymmetry of the electron production with transverse momentum ranging 0.5 pT 3.0 GeV/c is measured and confirmed to be zero-consistent within the limit of the statistical uncertainty of about 1%. This result identifies the constraint of the gluon polarization in the small Bjorken
Book Synopsis Transverse Target Spin Asymmetry in Inclusive DIS with Two-photon Exchange by :
Download or read book Transverse Target Spin Asymmetry in Inclusive DIS with Two-photon Exchange written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We study the transverse target spin dependence of the cross section for the inclusive electron-nucleon scattering with unpolarized beam. Such dependence is absent in the one-photon exchange approximation (Christ-Lee theorem) and arises only in higher orders of the QED expansion, from the interference of one-photon and absorptive two-photon exchange amplitudes as well as from real photon emission (bremsstrahlung). We demonstrate that the transverse spin-dependent two-photon exchange cross section is free of QED infrared and collinear divergences. We argue that in DIS kinematics the transverse spin dependence should be governed by a "parton-like" mechanism in which the two-photon exchange couples mainly to a single quark. We calculate the normal spin asymmetry in an approximation where the dominant contribution arises from quark helicity flip due to interactions with non-perturbative vacuum fields (constituent quark picture) and is proportional to the quark transversity distribution in the nucleon. Such helicity-flip processes are not significantly Sudakov-suppressed if the infrared scale for gluon emission in the photon-quark subprocess is of the order of the chiral symmetry breaking scale, mu^2_chiral”Lambda^2_QCD. We estimate the asymmetry in the kinematics of the planned Jefferson Lab Hall A experiment to be of the order 10^-4, with different sign for proton and neutron. We also comment on the spin dependence in the limit of soft high-energy scattering.
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 Transverse Spin Asymmetries in Neutral Strange Particle Production by :
Download or read book Transverse Spin Asymmetries in Neutral Strange Particle Production written by and published by . This book was released on 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 Study of Double Spin Asymmetries in Inclusive Ep Scattering at Jefferson Lab by :
Download or read book Study of Double Spin Asymmetries in Inclusive Ep Scattering at Jefferson Lab written by and published by . This book was released on 2014 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: The spin structure of the proton has been investigated in the high Bjorken x and low momentum transfer Q2 region. We used Jefferson Lab's polarized electron beam, a polarized target, and a spectrometer to get both the parallel and perpendicular spin asymmetries Apar and Aperp. These asymmetries produced the physics asymmetries A_1 and A_2 and spin structure functions g_1 and g_2. We found Q2 dependences of the asymmetries at resonance region and higher-twist effects. Our result increases the available data on the proton spin structure, especially at resonance region with low Q2. Moreover, A_2 and g_2 data show clear Q2 evolution, comparing with RSS and SANE-BETA. Negative resonance in A_2 data needs to be examined by theory. It can be an indication of very negative transverse-longitudinal interference contribution at W ̃1.3 GeV. Higher twist effect appears at the low Q2 of 1.9 GeV2, although it is less significant than lower Q2 data of RSS. Twist03 matrix element d_2 was calculated using our asymmetry fits evaluation at Q2 – 1.9 GeV2. D-bar_2 = -0.0087±0.0014 was obtained by integrating 0.47 ≤ x ≤ 0.87.
Book Synopsis Intersections of Particle and Nuclear Physics by : Zohreh Parsa
Download or read book Intersections of Particle and Nuclear Physics written by Zohreh Parsa and published by American Inst. of Physics. This book was released on 2004-03-09 with total page 884 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this meeting, as with the seven previous conferences in this series, was to bring together particle and nuclear physicists to share scientific reports and discuss areas of research which overlap both their disciplines. Its relevance has steadily grown as the areas of overlap between particle and nuclear physics have increased. In addition, the success of the standard model has provided a common underpinning for both disciplines as well as similar fundamental goals. Indeed, Quantum Chromodynamics (QCD) has proven to be "the" theory of strong interactions. As such, it forms the basis for nuclear physics as well as high energy hadronic interactions. Topics included are: QCD spectroscopy and dynamics, relativistic heavy ions, QCD and nuclear structure, lepton-hadron and hadron-hadron scattering, heavy quark and heavy lepton physics, spin physics, nuclear and particle astrophysics, neutrinos, accelerators, facilities and detectors, as well as tests of fundamental symmetries.
Book Synopsis SINGLE-TRANSVERSE SPIN ASYMMETRIES. by : W. VOGELSANG
Download or read book SINGLE-TRANSVERSE SPIN ASYMMETRIES. written by W. VOGELSANG and published by . This book was released on 2006 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We give a brief overview of some of the recent results on single-transverse spin asymmetries, highlighting in particular progress in theoretical understanding.
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 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 Transversity 2008 - Proceedings Of The Second Workshop On Transverse Polarization Phenomena In Hard Processes by : Guiseppe Ciullo
Download or read book Transversity 2008 - Proceedings Of The Second Workshop On Transverse Polarization Phenomena In Hard Processes written by Guiseppe Ciullo and published by World Scientific. This book was released on 2009-04-29 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Transversity 2008, the second workshop on “Transverse polarization phenomena in hard processes” follows the first one held in Como after three years. As in that case, the event comes at the end of a two-years project financed by the Italian Ministry of Education.In the time between the two Workshops, decisive steps towards the revealing of the transverse spin structure of the proton were taken on both the theoretical and experimental sides.The milestone of the first extraction of Transversity and the Sivers function for the u- and d-quarks deserves a special mention. In the same period, historic experiments that in the last decade contributed to the first pioneering measurements in the SIDIS sector, have concluded their data taking, and their place is being taken by upgrades of existing or new facilities. These are the result of the new interesting phenomena which are appearing and call for additional experimental information and novel experimental techniques.Over 80 physicists took part in the Workshop. Equally involved were experimentalists and theoreticians engaged in investigating the nature of transverse spin. The heterogeneous public favoured vivid discussions and fruitful exchange of up-to-date theoretical and experimental ideas on this constantly evolving subject.
Book Synopsis Qcd Corrections And New Physics - Proceedings Of The International Symposium by : Jiro Kodaira
Download or read book Qcd Corrections And New Physics - Proceedings Of The International Symposium written by Jiro Kodaira and published by World Scientific. This book was released on 1998-09-02 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses recent developments in both the theoretical and the experimental aspects of QCD. Its main goal is to establish precise predictions of the Standard Model in order to find clues to the discovery of New Physics.
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.
