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Featured researches published by B. Pire.


Physics Letters B | 1997

Testing the handbag contribution to exclusive virtual Compton scattering

Markus Diehl; Thierry Gousset; B. Pire; John P. Ralston

Abstract We discuss the handbag approximation to exclusive deep virtual Compton scattering. After defining the kinematical region where this approximation can be valid, we propose tests for its relevance in planned electroproduction experiments, e + p → e + p + γ . We focus on scaling laws in the cross section, and the distribution in the angle between the lepton and hadron planes, which contains valuable information on the angular momentum structure of the Compton process. We advocate to measure weighted cross sections, which make use of the data in the full range of this angle and do not require very high event statistics.


Physics Letters B | 1978

Hadronic jets with a large Q⊥ lepton pair trigger

J.M. Brucker; J. Husser; M. Fontannaz; D. Schiff; B. Pire

Abstract We propose to observe hadron jets in correlation with large Q⊥ transverse momentum lepton pairs. This would allow to test the theoretical idea that the large transverse momentum of the pair is mainly produced through a scattering subprocess a + b → c +γ ∗ . The quantum number content of these jets is a specific signature of the subprocess, especially of those involved in perturbative QCD.


European Physical Journal A | 2014

Cross-channel analysis of quark and gluon generalized parton distributions with helicity flip

B. Pire; K. Semenov-Tian-Shansky; L. Szymanowski; Samuel Wallon

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.


Physics Letters B | 2006

QCD factorizations in gamma* gamma* ---> rho rho

B. Pire; L. Szymanowski; S. Wallon; M. Segond

We calculate the lowest order QCD amplitude, i.e. the quark exchange contribution, to the forward production amplitude of a pair of longitudinally polarized


arXiv: High Energy Physics - Phenomenology | 2011

Baryon to meson transition distribution amplitudes and their spectral representation

B. Pire; Kirill Semenov-Tian-Shansky; Lech Szymanowski

rho


arXiv: High Energy Physics - Phenomenology | 2009

Pomeron‐Odderon interference in production of π+π− pairs in ultraperipheral collisions

B. Pire; F. Schwennsen; L. Szymanowski; S. Wallon

mesons in the scattering of two virtual photons


Physics Letters B | 2006

QCD factorizations in γ ∗ γ ∗ → ρ L 0 ρ L 0

B. Pire; M. Segond; L. Szymanowski; S. Wallon

gamma^*(Q_1) gamma^*(Q_2) to rho^0_L rho^0_L


arXiv: High Energy Physics - Phenomenology | 1999

Exclusive hadronization in gamma* gamma -> pi pi

M. Diehl; T. Gousset; B. Pire

. We show that the scattering amplitude simultaneously factorizes in two quite different ways: the part with transverse photons is described by the QCD factorization formula involving the generalized distribution amplitude of two final


arXiv: High Energy Physics - Phenomenology | 1998

Deeply virtual Compton scattering: How to test handbag dominance?

T. Gousset; M. Diehl; B. Pire; John P. Ralston

rho


Physics Letters B | 1998

Off-diagonal helicity density matrix elements for heavy vector mesons inclusively produced in NN,γN and ℓN interactions

M. Anselmino; M. Bertini; F. Murgia; B. Pire

mesons, whereas the part with longitudinally polarized photons takes the QCD factorized form with the n

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M. Segond

University of Paris-Sud

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S. Wallon

University of Paris-Sud

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D. Schiff

Centre national de la recherche scientifique

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F. Schwennsen

Centre national de la recherche scientifique

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Kirill Semenov-Tian-Shansky

Centre national de la recherche scientifique

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M. Fontannaz

Centre national de la recherche scientifique

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