☆ 4.7 Article

Timelike and spacelike hard exclusive reactions

PHYSICAL REVIEW D (2012)

期刊

PHYSICAL REVIEW D

卷 86, 期 3, 页码 -

出版社

AMER PHYSICAL SOC

DOI: 10.1103/PhysRevD.86.031502

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Astronomy & Astrophysics Physics, Particles & Fields

资金

Polish Grant NCN [DEC-2011/01/D/ST2/02069]
French-Polish collaboration agreement Polonium, BMBF [06BO9012]
Joint Research Activity Study of Strongly Interacting Matter under Seventh Framework Program of the European Community [283286]

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We show to next-to-leading order accuracy in the strong coupling alpha(s) how the collinear factorization properties of QCD in the generalized Bjorken regime relate exclusive amplitudes for spacelike and timelike hadronic processes. This yields simple space-to-timelike relations linking the amplitudes for electroproduction of a photon or meson to those for photo- or mesoproduction of a lepton pair. These relations constitute a new test of the relevance of leading twist analyses of experimental data.

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Accessing chiral-even quark generalised parton distributions in the exclusive photoproduction of a γπ± pair with large invariant mass in both fixed-target and collider experiments

Goran Duplancic, Saad Nabeebaccus, Kornelija Passek-Kumericki, Bernard Pire, Lech Szymanowski, Samuel Wallon

Summary: We calculate the exclusive photoproduction of a gamma pi(+/-) pair using the collinear factorisation framework, in a regime where the pair has a large invariant mass and the meson has a sufficiently large transverse momentum to avoid resonance with the outgoing nucleon. This process provides a new avenue for studying Generalized Parton Distributions (GPDs), particularly at small skewness xi, due to the high center-of-mass energies available at future experiments. By computing the scattering amplitude at leading twist and leading order in alpha(s), we estimate the cross-section and linear polarisation asymmetries for various kinematics at JLab 12-GeV, COMPASS, future EIC, and LHC (in ultra-peripheral collisions). Our results suggest that the magnitudes of the estimates are large enough to warrant dedicated experimental analysis, especially at JLab. We also compare the results obtained using an asymptotic distribution amplitude (DA) with those obtained using a recently proposed holographic DA.

JOURNAL OF HIGH ENERGY PHYSICS (2023)

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Review Physics, Nuclear

Precision studies of QCD in the low energy domain of the EIC

V. D. Burkert, L. Elouadrhiri, A. Afanasev, J. Arrington, M. Contalbrigo, W. Cosyn, A. Deshpande, D. I. Glazier, X. Ji, S. Liuti, Y. Oh, D. Richards, T. Satogata, A. Vossen, H. Abdolmaleki, A. Albataineh, C. A. Aidala, C. Alexandrou, H. Avagyan, A. Bacchetta, M. Baker, F. Benmokhtar, J. C. Bernauer, C. Bissolotti, W. Briscoe, D. Byers, Xu Cao, C. E. Carlson, K. Cichy, I. C. Cloet, C. Cocuzza, P. L. Cole, M. Constantinou, A. Courtoy, H. Dahiyah, K. Dehmelt, S. Diehl, C. Dilks, C. Djalali, R. Dupre, S. C. Dusa, B. El-Bennich, L. El Fassi, T. Frederico, A. Freese, B. R. Gamage, L. Gamberg, R. R. Ghoshal, F. X. Girod, V. P. Goncalves, Y. Gotra, F. K. Guo, X. Guo, M. Hattawy, Y. Hatta, T. Hayward, O. Hen, G. M. Huber, C. Hyde, E. L. Isupov, B. Jacak, W. Jacobs, A. Jentsch, C. R. Ji, S. Joosten, N. Kalantarians, Z. Kang, A. Kim, S. Klein, B. Kriesten, S. Kumano, A. Kumar, K. Kumericki, M. Kuchera, W. K. Lai, Jin Li, Shujie Li, W. Li, X. Li, H. -W. Lin, K. F. Liu, Xiaohui Liu, P. Markowitz, V Mathieu, M. McEneaney, A. Mekki, J. P. B. C. de Melo, Z. E. Meziani, R. Milner, H. Mkrtchyan, V. Mochalov, V. Mokeev, V. Morozov, H. Moutarde, M. Murray, S. Mtingwa, P. Nadel-Turonski, V. A. Okorokov, E. Onyie, L. L. Pappalardo, Z. Papandreou, C. Pecar, A. Pilloni, B. Pire, N. Polys, A. Prokudin, M. Przybycien, J. -W. Qiu, M. Radici, R. Reed, F. Ringer, B. J. Roy, N. Sato, A. Schaefer, B. Schmookler, G. Schnell, P. Schweitzer, R. Seidl, K. M. Semenov-Tian-Shansky, F. Serna, F. Shaban, M. H. Shabestari, K. Shiells, A. Signori, H. Spiesberger, I. Strakovsky, R. S. Sufian, A. Szczepaniak, L. Teodorescu, J. Terry, O. Teryaev, F. Tessarotto, C. Timmer, Abdel Nasser Tawfik, L. Valenzuela Cazares, A. Vladimirov, E. Voutier, D. Watts, D. Wilson, D. Winney, B. Xiao, Z. Ye, Zh. Ye, F. Yuan, N. Zachariou, I. Zahed, J. L. Zhang, Y. Zhang, J. Zhou

Summary: This White Paper aims to emphasize the significant advantages in the scientific progress achieved by the EIC. High luminosity operation is highly desirable as it allows for faster production and collection of scientific results. This becomes crucial for programs that require months or even years of operation at lower luminosity.

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS (2023)

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Article Astronomy & Astrophysics

Kinematical higher-twist corrections in ??? M1M2?: Neutral meson production

Bernard Pire, Qin-Tao Song

Summary: This paper investigates the impact of kinematical higher-twist corrections on the cross section of the & gamma;& DBLBOND; & RARR; M1M2 & gamma; process, up to twist 4. The three independent helicity amplitudes are presented in terms of twist-2 Generalized Distribution Amplitudes (GDAs), which are important nonperturbative quantities for understanding the 3D structure of hadrons. The numerical estimate of the kinematical higher-twist corrections is performed using the kinematics of BESIII, and it is shown that these corrections account for approximately 20% of the cross sections on average.

PHYSICAL REVIEW D (2023)

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Article Astronomy & Astrophysics

Probing chiral-even and chiral-odd leading twist quark generalized parton distributions through the exclusive photoproduction of a γρ pair

Goran Duplancic, Saad Nabeebaccus, Kornelija Passek-Kumericki, Bernard Pire, Lech Szymanowski, Samuel Wallon

Summary: We extend our studies of a new class of 2 -> 3 exclusive processes by considering the exclusive photoproduction of a gamma rho pair. Our analysis covers the whole kinematical range from medium energies in fixed-target experiments to very large energies of colliders. We find that the obtained cross sections are sufficiently large for a dedicated experimental analysis to be performed, especially at JLab.

PHYSICAL REVIEW D (2023)

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Proceedings Paper Physics, Multidisciplinary

ACCESSING GPDs THROUGH THE EXCLUSIVE PHOTOPRODUCTION OF A PHOTON-MESON PAIR WITH A LARGE INVARIANT MASS

Saad Nabeebaccus, Samuel Wallon, Goran Duplancic, Kornelija Passek-Kumericki, Bernard Pire, Lech Szymanowski

Summary: We study the exclusive photoproduction of a photon-meson pair with a large invariant mass in the framework of QCD factorisation. The focus is on the chiral-even sector of the generalised parton distributions (GPDs). The potential measurements of these distributions in various experiments, such as JLab 12-GeV, COMPASS, future EIC, and LHC, are discussed. The polarisation asymmetries with respect to the incoming photon are also computed.

ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT (2023)

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Article Astronomy & Astrophysics

Kinematical higher-twist corrections in γ*γ → M(M)over-bar

Cedric Lorce, Bernard Pire, Qin-Tao Song

Summary: We estimated the kinematical higher-twist corrections to the gamma*(q(1))gamma(q(2)) -> M(p(1))(M) over bar (p(2)) amplitudes, and calculated the cross sections for gamma*gamma -> pi(0)pi(0) and gamma*gamma -> eta eta. The results show that the kinematical higher-twist corrections play an important role in the total cross section, and considering these corrections is necessary for an accurate evaluation of the meson energy-momentum tensor form factors.

PHYSICAL REVIEW D (2022)

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Article Physics, Particles & Fields

Backward timelike Compton scattering to decipher the photon content of the nucleon

Bernard Pire, Kirill M. Semenov-Tian-Shansky, Alisa A. Shaikhutdinova, Lech Szymanowski

Summary: This paper discusses the exclusive photoproduction of nucleon with a large invariant mass lepton pair in the backward region specified by the small Mandelstam variable -u. The amplitude is factorized in terms of photon-to-nucleon Transition Distribution Amplitudes (TDAs), which provide a tomographic picture of the nucleon's photon content. A simplistic model-estimate is used to estimate the magnitude of the corresponding cross sections, and the background due to the electromagnetic Bethe-Heitler process is shown to be negligible in the kinematical regime of interest.

EUROPEAN PHYSICAL JOURNAL C (2022)

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Article Physics, Multidisciplinary

The Status and Future of Color Transparency and Nuclear Filtering

Pankaj Jain, Bernard Pire, John P. Ralston

Summary: This review discusses the controversial interpretations of experimental data regarding the phenomenon of color transparency fourty years after its introduction. The presented evidence examines the manifestation of color transparency in various exclusive hard scattering reactions. The authors advocate for new nuclear transparency measurements in different experimental set-ups, including near-forward exclusive reactions related to generalized parton distribution (GPD) physics and near-backward exclusive reactions related to transition distribution amplitudes (TDA) physics.

PHYSICS (2022)

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Article Physics, Multidisciplinary

u-Channel Color Transparency Observables

Garth M. Huber, Wenliang B. Li, Wim Cosyn, Bernard Pire

Summary: This paper proposes to study the occurrence of color transparency in hard exclusive reactions in the backward regime. Guided by encouraging results from Jefferson Laboratory, the study shows that investigating nuclear targets provides a new opportunity for testing nuclear color transparency.

PHYSICS (2022)

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Article Astronomy & Astrophysics

Phenomenology of diphoton photoproduction at next-to-leading order

O. Grocholski, B. Pire, P. Sznajder, L. Szymanowski, J. Wagner

Summary: This study focuses on diphoton exclusive photoproduction in the kinematics where collinear QCD factorization framework applies. The results show that the predictions for cross sections are sensitive to various models of generalized parton distributions (GPDs). Despite the large and negative NLO corrections, the reaction studied remains a promising tool for extracting C-odd GPDs.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Collinear factorization of diphoton photoproduction at next to leading order

O. Grocholski, B. Pire, P. Sznajder, L. Szymanowski, J. Wagner

Summary: This study calculates the amplitude for the photoproduction of a near forward large mass diphoton at leading twist and next to leading order in the framework of collinear factorization. The validity of factorization at this order is demonstrated, with the NLO result probing the whole domain of definition of quark GPDs with both real and imaginary parts. Phenomenology of the results for medium (JLab) and higher energy (EIC) experiments will be developed in future studies.

PHYSICAL REVIEW D (2021)

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