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πN TDAs from charmonium production in association with a forward pion at PANDA ; ; Semenov-Tyan-Shanskiy, Kirill et al in EPJ Web of Conferences (2014), 73 Detailed reference viewed: 11 (0 ULg)Toward modelization of quark and gluon transversity generalized parton distributions ; Semenov-Tyan-Shanskiy, Kirill ; et al in PoS - Proceedings of Science (2014), PoS DIS2014 Detailed reference viewed: 8 (0 ULg)Cross-channel analysis of quark and gluon generalized parton distributions with helicity flip ; Semenov-Tyan-Shanskiy, Kirill ; et al in European Physical Journal A -- Hadrons & Nuclei (2014), 50 Quark and gluon helicity flip generalized parton distributions (GPDs) address the transversity quark and gluon structure of the nucleon. In order to construct a theoretically consistent parametrization of ... [more ▼] Quark and gluon helicity flip generalized parton distributions (GPDs) address the transversity quark and gluon structure of the nucleon. In order to construct a theoretically consistent parametrization of these hadronic matrix elements, we work out the set of combinations of those GPDs suitable for the SO(3) partial wave (PW) expansion in the cross-channel. This universal result will help to build up a flexible parametrization of these important hadronic non-perturbative quantities, using, for instance, the approaches based on the conformal PW expansion of GPDs such as the Mellin-Barnes integral or the dual parametrization techniques [less ▲] Detailed reference viewed: 10 (0 ULg)QCD description of charmonium plus light meson production in p̄-N annihilation ; Semenov-Tyan-Shanskiy, Kirill ; in Physics Letters B (2013), 724 Detailed reference viewed: 16 (2 ULg)Nucleon-to-pion transition distribution amplitudes: a challenge for PANDA ; Semenov-Tyan-Shanskiy, Kirill ; in Few-Body Systems (2013) Baryon-to-meson Transition Distribution Amplitudes (TDAs) appear as building blocks in the collinear factorized description of amplitudes for a class of hard exclusive reactions, prominent examples being ... [more ▼] Baryon-to-meson Transition Distribution Amplitudes (TDAs) appear as building blocks in the collinear factorized description of amplitudes for a class of hard exclusive reactions, prominent examples being hard exclusive pion electroproduction off a nucleon in the backward region and baryon-antibaryon annihilation into a pion and a lepton pair or a charmonium. Baryon-to-meson TDAs extend both the concepts of generalized parton distributions (GPDs) and baryon distribution amplitudes (DAs) encoding valuable complementary information on the hadronic structure. We review the basic properties of baryon-to-meson TDAs and discuss the perspectives for the experimental access with the PANDA detector. [less ▲] Detailed reference viewed: 6 (0 ULg)Accessing baryon to meson transition distribution amplitudes in meson production in association with a high invariant mass lepton pair at GSI-FAIR with P̅ ANDA Lansberg, Jean-Philippe ; ; Semenov-Tyan-Shanskiy, Kirill et al in Physical Review. D : Particles and Fields (2012), 86 Nucleon-antinucleon annihilation into a near backward- (or forward-) produced meson and a high invariant mass lepton pair admits a factorized description in terms of antinucleon (or nucleon) distribution ... [more ▼] Nucleon-antinucleon annihilation into a near backward- (or forward-) produced meson and a high invariant mass lepton pair admits a factorized description in terms of antinucleon (or nucleon) distribution amplitudes (DAs) and nucleon to meson (or antinucleon to meson) transition distribution amplitudes (TDAs). We estimate the cross section of backward (and forward) pion and eta-meson production in association with a high invariant mass lepton pair for the kinematical conditions of GSI-FAIR. The cross sections are found to be large enough to be measured with the PANDA detector. Interesting phenomenological applications of the approach are thus expected. [less ▲] Detailed reference viewed: 4 (0 ULg)Consistent model for \pi N transition distribution amplitudes and backward pion electroproduction Lansberg, Jean-Philippe ; ; Semenov-Tian-Chanski, Kirill et al in Physical Review. D : Particles and Fields (2012), 85 The extension of the concept of generalized parton distributions leads to the introduction of baryon to meson transition distribution amplitudes (TDAs), nondiagonal matrix elements of the nonlocal three ... [more ▼] The extension of the concept of generalized parton distributions leads to the introduction of baryon to meson transition distribution amplitudes (TDAs), nondiagonal matrix elements of the nonlocal three quark operator between a nucleon and a meson state. We present a general framework for modeling nucleon to pion (\pi N) TDAs. Our main tool is the spectral representation for \pi N TDAs in terms of quadruple distributions. We propose a factorized Ansatz for quadruple distributions with input from the soft-pion theorem for \pi N TDAs. The spectral representation is complemented with a D-term like contribution from the nucleon exchange in the cross channel. We then study backward pion electroproduction in the QCD collinear factorization approach in which the nonperturbative part of the amplitude involves N TDAs. Within our two component model for N TDAs, we update previous leading-twist estimates of the unpolarized cross section. Finally, we compute the transverse target single spin asymmetry as a function of skewness. We find it to be sizable in the valence region and sensitive to the phenomenological input of our \pi N TDA model. [less ▲] Detailed reference viewed: 14 (0 ULg)Nucleon-to-Pion Transition Distribution Amplitudes and Backward Electroproduction of Pions. ; Semenov-Tyan-Shanskiy, Kirill ; in PoS - Proceedings of Science (2012), QNP2012 Detailed reference viewed: 4 (3 ULg)Exploring the nucleon structure through GPDs and TDAs in hard exclusive processes ; Semenov-Tyan-Shanskiy, Kirill ; et al Conference (2011) Detailed reference viewed: 18 (0 ULg)New Results in Exclusive Hard Reactions ; Semenov-Tyan-Shanskiy, Kirill ; et al in PoS - Proceedings of Science (2011), EPS-HEP2011 Detailed reference viewed: 8 (0 ULg)pi N transition distribution amplitudes: Their symmetries and constraints from chiral dynamics ; Semenov-Tyan-Shanskiy, Kirill ; in Physical Review. D : Particles and Fields (2011), 84 Detailed reference viewed: 12 (0 ULg)Cross Section and Single Transverse Target Spin Asymmetry for backward Pion Electroproduction. ; Semenov-Tyan-Shanskiy, Kirill ; in XIV Advanced Research Workshop on High Energy Spin Physics, Dubna 20-24 September 2011 (2011) Detailed reference viewed: 11 (1 ULg)Baryon to meson transition distribution amplitudes and their spectral representation ; Semenov-Tyan-Shanskiy, Kirill ; in AIP Conference Proceedings (2010), 1350 Detailed reference viewed: 8 (0 ULg)Spectral representation for baryon to meson transition distribution amplitudes ; Semenov-Tyan-Shanskiy, Kirill ; in Physical Review. D : Particles and Fields (2010), 82 Detailed reference viewed: 6 (0 ULg) |
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