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Defining the Observables for Quarks and Gluons Orbital Angular Momentum Distributions ; Courtoy, Aurore ; et al in Few-Body Systems (2015), 56(6-9), 325-330 We present a critical discussion of the observables that have been recently put forth to describe quarks and gluons orbital angular momentum distributions. Starting from a standard parameterization of the ... [more ▼] We present a critical discussion of the observables that have been recently put forth to describe quarks and gluons orbital angular momentum distributions. Starting from a standard parameterization of the energy momentum tensor in QCD one can single out two forms of angular momentum, a so-called kinetic term, generally associated with the Ji decomposition, and a canonical term from the Jaffe Manohar decomposition. Orbital angular momentum has been connected to a Generalized Transverse Momentum Distribution (GTMD), for the canonical term, and to a twist three Generalized Parton Distribution for the kinetic term. We argue that while the latter appears as an azymuthal angular modulation in the longitudinal target spin asymmetry in deeply virtual Compton scattering, due to parity constraints, the GTMD associated with canonical angular momentum cannot be measured in a similar set of experiments. [less ▲] Detailed reference viewed: 17 (0 ULg)Dihadron fragmentation functions and transversity ; Courtoy, Aurore ; in EPJ Web of Conferences (2015), 85 We present preliminary results for an updated extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized ... [more ▼] We present preliminary results for an updated extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets in collinear factorization. Data for proton and deuteron targets by HERMES and COMPASS allow for a flavor separation of the valence components of transversity, while di-hadron fragmentation functions are taken from the semi-inclusive production of two pion pairs in back-to-back jets in e+e- annihilation. The latter data from Belle have been reanalyzed using the replica method and a more realistic estimate of the uncertainties on the chiral-odd interference fragmentation function has been obtained. After encoding this piece of information into the deep-inelastic scattering cross section, the transversity has been re-extracted by using the most recent and more precise COMPASS data for proton target. This picture represents the current most realistic estimate of the uncertainties on our knowledge of transversity. The preliminary results indicate that the valence up component seems smaller and with a narrower error band than in previous extraction. © 2015 Owned by the authors, published by EDP Sciences. [less ▲] Detailed reference viewed: 10 (0 ULg)Beyond-Standard-Model Tensor Interaction and Hadron Phenomenology Courtoy, Aurore ; ; et al in Physical Review Letters (2015), 115(16), 162001 Detailed reference viewed: 15 (1 ULg)Improved extraction of valence transversity distributions from inclusive dihadron production ; Courtoy, Aurore ; et al in Journal of High Energy Physics [=JHEP] (2015), 1505 Detailed reference viewed: 19 (4 ULg)On the observability of the quark orbital angular momentum distribution Courtoy, Aurore ; ; et al in Physics Letters B (2014), 731(0), 141-147 Detailed reference viewed: 15 (0 ULg)Analysis of $\alpha_s$ from the realization of quark-hadron duality Courtoy, Aurore ; in World Scientific (2013) Detailed reference viewed: 11 (1 ULg)Valence transversities: the collinear extraction Courtoy, Aurore ; ; in PoS - Proceedings of Science (2013) Detailed reference viewed: 9 (1 ULg)Phenomenology of $\alpha_s$ at intermediate energy: the quark-hadron duality approach Courtoy, Aurore in PoS - Proceedings of Science (2013) Detailed reference viewed: 18 (2 ULg)Partonic Picture of Generalized Transverse Momentum Distributions ; Courtoy, Aurore ; et al in World Scientific (2013) Detailed reference viewed: 18 (1 ULg)Detecting correlated di-hadron pairs: about the extraction of transversity and beyond ; ; Courtoy, Aurore in World Scientific (2013) Detailed reference viewed: 10 (0 ULg)Extraction of $\alpha_s$ from deep inelastic scattering at large $x$ Courtoy, Aurore ; in Physics Letters B (2013), B726 Detailed reference viewed: 12 (0 ULg)First extraction of valence transversities in a collinear framework ; Courtoy, Aurore ; in Journal of High Energy Physics [=JHEP] (2013), 1303 Detailed reference viewed: 12 (0 ULg)First extraction of interference fragmentation functions from e+e- data Courtoy, Aurore ; ; et al in Physical Review. D, Particles, Fields, Gravitation, and Cosmology (2012), 85(11), We report on the first extraction of interference fragmentation functions from the semi-inclusive production of two hadron pairs in back-to-back jets in e+e- annihilation. A nonzero asymmetry in the ... [more ▼] We report on the first extraction of interference fragmentation functions from the semi-inclusive production of two hadron pairs in back-to-back jets in e+e- annihilation. A nonzero asymmetry in the correlation of azimuthal orientations of opposite π+π- pairs is related to the transverse polarization of fragmenting quarks through a significant polarized dihadron fragmentation function. Extraction of the latter requires the knowledge of its unpolarized counterpart, the probability density for a quark to fragment in a π +π - pair. Since data for the unpolarized cross section are missing, we extract the unpolarized dihadron fragmentation function from a Monte Carlo simulation of the cross section. © 2012 American Physical Society. [less ▲] Detailed reference viewed: 12 (2 ULg)Status on the transversity parton distribution: the dihadron fragmentation functions way Courtoy, Aurore ; ; in PoS - Proceedings of Science (2012), QNP2012 We report on the extraction of dihadron fragmentation functions (DiFF) from the semiinclusive production of two hadron pairs in back-to-back jets in e+e- annihilation. A nonzero asymmetry in the ... [more ▼] We report on the extraction of dihadron fragmentation functions (DiFF) from the semiinclusive production of two hadron pairs in back-to-back jets in e+e- annihilation. A nonzero asymmetry in the correlation of azimuthal orientations of opposite π+π− pairs is related to the transverse polarization of fragmenting quarks through a significant polarized DiFF. A combined analysis of this asymmetry and the spin asymmetry in the SIDIS process ep↑→e′(π+π−)X has led to the first extraction of the u and d-flavor transversity parton distribution function in the framework of collinear factorization. [less ▲] Detailed reference viewed: 18 (7 ULg)The Strong Coupling Constant from Hadron Structure Phenomenology Courtoy, Aurore ; in International Journal of Modern Physics Conference Series (2012) We present recent developments on the role of the running coupling constant at the intersection of perturbative and nonperturbative QCD. A number of experiments show a smooth transition from small to ... [more ▼] We present recent developments on the role of the running coupling constant at the intersection of perturbative and nonperturbative QCD. A number of experiments show a smooth transition from small to large scales given by the four-momentum transfer in the reactions. This is at variance with perturbative QCD where the running coupling constant becomes infinite when the scale equals ΛQCD. Approaches using an effective coupling constant could help interpret the opposite trend of data as compared to standard perturbative QCD predictions. We give an overview of the role of the coupling constant in the procedure to match nonperturbative hadronic model to perturbative QCD and we propose an extraction of an effective coupling constant from inclusive electron proton scattering data at large Bjorken x. [less ▲] Detailed reference viewed: 7 (1 ULg)Interference Fragmentation Functions and Transverse Spin Studies. Courtoy, Aurore ; ; Conference (2012) We report on the extraction of dihadron fragmentation functions (DiFF) from the semi- inclusive production of two hadron pairs in back-to-back jets in e+e− annihilation. A nonzero asymmetry in the ... [more ▼] We report on the extraction of dihadron fragmentation functions (DiFF) from the semi- inclusive production of two hadron pairs in back-to-back jets in e+e− annihilation. A nonzero asymmetry in the correlation of azimuthal orientations of opposite π+π− pairs is related to the transverse polarization of fragmenting quarks through a significant polarized DiFF. A combined analysis of this asymmetry and the spin asymmetry in the SIDIS process ep↑ → e′(π+π−)X has led to the first extraction of the u and d-flavor transversity parton distribution function in the framework of collinear factorization. [less ▲] Detailed reference viewed: 21 (6 ULg)Dihadron fragmentation functions and their relevance for transverse spin studies Courtoy, Aurore ; ; in Journal of Physics: Conference Series (2011), 295(1), Dihadron fragmentation functions describe the probability that a quark fragments into two hadrons plus other undetected hadrons. In particular, the so-called interference fragmentation functions describe ... [more ▼] Dihadron fragmentation functions describe the probability that a quark fragments into two hadrons plus other undetected hadrons. In particular, the so-called interference fragmentation functions describe the azimuthal asymmetry of the dihadron distribution when the quark is transversely polarized. They can be used as tools to probe the quark transversity distribution in the nucleon. Recent studies on unpolarized and polarized dihadron fragmentation functions are presented, and we discuss their role in giving insights into transverse spin distributions. [less ▲] Detailed reference viewed: 7 (0 ULg)The Dihadron fragmentation functions way to Transversity Courtoy, Aurore ; ; in AIP Conference Proceedings (2011) Detailed reference viewed: 12 (6 ULg)The Role of the Running Coupling Constant in the Unveiling of The Hadronic Structure Courtoy, Aurore in PoS - Proceedings of Science (2011), QCD-TNT-II Detailed reference viewed: 8 (0 ULg)On the Role of the Running Coupling Constant in a Quark Model Analysis of T-odd TMDs Courtoy, Aurore in International Journal of Modern Physics Conference Series (2011), 04 Detailed reference viewed: 2 (0 ULg) |
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