Transversity And Sidis At Jefferson Lab PDF Download
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| Release | : 2005 |
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Download Transversity and SIDIS at Jefferson Lab Book in PDF, ePub and Kindle
Remarkable progress in the study of spin-dependent structure functions has been made since the discovery of the ''proton spin puzzle'' in the late 1980's. Very active spin-physics programs have been pursued at many facilities including SLAC, CERN, HERA, JLab, and RHIC. In recent years, new experimental tools such as semi-inclusive polarized DIS, polarized proton-proton collision, and deeply exclusive reactions have been employed to address various aspects of the proton spin. In this paper, we present the plans at the Jefferson Lab to use the semi-inclusive DIS (SIDIS) reactions to measure various unpolarized and polarized nucleon parton distribution and fragmentation functions. In addition, the prospect of probing the flavor structure of the kaon fragmentation function is discussed.
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| Total Pages | : 123 |
| Release | : 1945 |
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Download Rapport au gouvernement Book in PDF, ePub and Kindle
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| Release | : 2005 |
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Download The Program of Transversity Experiments at Jefferson Lab Book in PDF, ePub and Kindle
| Author | : Dr. Vincenzo Barone |
| Publisher | : World Scientific |
| Total Pages | : 354 |
| Release | : 2006 |
| Genre | : Science |
| ISBN | : 9812568468 |
Download Transversity 2005 Book in PDF, ePub and Kindle
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.
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| Release | : 2015 |
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Download Recent Results of Semi-inclusive DIS Experiments at Jefferson Lab Book in PDF, ePub and Kindle
Semi-inclusive deep inelastic scattering (SIDIS) is a powerful tool to explore the 3-d structure of nucleon in momentum space. Through a combination of polarized or unpolarized lepton beam and nucleon target one can study various transverse-momentum dependent parton distribution functions (TMDs) that appear in the SIDIS cross-section. TMDs provide a description of nucleon structure in terms of parton's transverse momentum and its transverse spin, which enables us to study the quark orbital angular momentum effects in the nucleon. Several SIDIS experiments were performed in three experimental halls at JLab with 6 GeV electron beam using both polarized or upolarized beam and target combinations. The kinematic range was mainly focued on valence quark region. In this proceeding we will discuss some of the recent results from JLab 6 GeV run.
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| Total Pages | : 6 |
| Release | : 2016 |
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Download Deeply Virtual Pseudoscalar Meson Production at Jefferson Lab and Transversity GPDs Book in PDF, ePub and Kindle
Transverse-momentum dependent parton distribution functions (TMDs) provide a description of nucleon structure in terms of the parton transverse momentum and its transverse spin. At leading twist there are eight TMDs, each offering a unique feature of quarks in a polarized or an unpolarized nucleon. The Sivers distribution is one of the most interesting TMD due to its non-universality. It has been extracted using the data from semi-inclusive deep-inelastic scattering (SIDIS), but there is no data yet from spin-dependent Drell-Yan (DY) process. Such measurement will provide a crucial test of TMD formalism which predicts an equal magnitude and opposite sign for the Sivers function extracted from SIDIS and DY process. We will discuss key future measurements of TMDs using both SIDIS and DY process with a focus on Hall A SoLID SIDIS program at Jefferson Lab.
| Author | : Ciullo Giuseppe |
| Publisher | : World Scientific |
| Total Pages | : 313 |
| Release | : 2009 |
| Genre | : Science |
| ISBN | : 9814277770 |
Download Transversity 2008 Book in PDF, ePub and Kindle
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.
| Author | : M. Anselmino |
| Publisher | : IOS Press |
| Total Pages | : 496 |
| Release | : 2008-07-14 |
| Genre | : Science |
| ISBN | : 1607503484 |
Download Strangeness and Spin in Fundamental Physics Book in PDF, ePub and Kindle
Strangeness and Spin in Fundamental Physics is dedicated to the discussion of the role played by two subtle and somehow puzzling quantum numbers, the strangeness and the spin, in fundamental physics. They both relate to basic properties of the fundamental quantum field theories describing strong and electro-weak interactions and to their phenomenological applications. In some instances, like the partonic spin structure of the proton, they are deeply correlated. The many puzzling results recently obtained by measuring several spin asymmetries have stimulated gigantic progresses in the study of the spin structure of protons and neutrons. Intense theoretical activity has discovered new features of non-perturbative QCD, like strong correlations between the spin and the intrinsic motions of quarks inside the nucleons. The purpose of this publication is that of providing a complete, updated and critical account of the most recent and relevant discoveries in the above fields, both from the experimental and theoretical sides.
| Author | : Peter Bosted |
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| Release | : 2006 |
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Download Factorization and Transverse Momentum in SIDIS at Jlab Book in PDF, ePub and Kindle
Data for pion electroproduction from both hydrogen and deuterium targets satisfy factorization tests in the kinematic region Q{sup 2}> 1 GeV{sup 2}, 0.15 x 0.45, W 2 GeV, M{sub x} 1.5 GeV, and 0.3
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| Total Pages | : 4 |
| Release | : 2014 |
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Download Studies of the Transverse Structure of the Nucleon at JLab Book in PDF, ePub and Kindle
Since the earliest measurements in the '70, hadronic physics deals with a number of surprising phenomena that cannot be explained in the framework of perturbative QCD. Examples are the small fraction of the proton spin carried by the valence quark spins, the persistence at high energies of single spin asymmetries and azimuthal asymmetries in unpolarized processes. It is now believed that the answer to these questions may come from the transverse motion of partons inside the nucleon, which is encoded in the Transverse Momentum Dependent (TMD) Parton Distribution Functions. Among the large variety of processes that can be described in terms of TMDs, a major role is played by Semi-Inclusive Deep Inelastic Scattering (SIDIS) reactions, in which, together with the scattered electron, one or more hadrons are detected in the final state. Single and Double Spin Asymmetries are the experimental observables sensitive to TMDs. The identification of the final hadrons allows the tagging of the quark involved in the reaction at the parton level, and then the flavor separation of the relevant TMDs. SIDIS reactions are studied at Jefferson Laboratories since many years and are one of the main items in the physics program after the upgrade of the CEBAF accelerator. The large amount of new data that will be available in few years calls for the implementation of new tools, such as multidimensional analyses and refined techniques of TMDs extraction from the experimental asymmetries. In this talk, the more recent results obtained at 6 GeV will be shown and the future measurements will be discussed.
