References of "Cudell, Jean-René"
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See detailLong-range potential and the fine structure of the diffraction peak
Selyugin, O. V.; Cudell, Jean-René ULg

in Capua, Marcella (Ed.) DIFFRACTION 2010: International Workshop on Diffraction in High Energy Physics Diffraction in High Energy Physics (2010)

The possibility of oscillations in the differential elastic cross section of hadron scattering at small momentum transfer is studied. It is shown that string-like quark potentials at large distances can ... [more ▼]

The possibility of oscillations in the differential elastic cross section of hadron scattering at small momentum transfer is studied. It is shown that string-like quark potentials at large distances can lead to such small oscillations, and an analysis of the experimental data at small |t| allows the determination of the parameters of the potential. [less ▲]

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See detailCentral exclusive production: Vector mesons, dijets, Higgs boson
Cudell, Jean-René ULg

(2010)

I review the situation of theoretical predictions of central exclusive production, and show that the CDF dijet data can be used to constrain the prediction of central exclusive Higgs boson production. I ... [more ▼]

I review the situation of theoretical predictions of central exclusive production, and show that the CDF dijet data can be used to constrain the prediction of central exclusive Higgs boson production. I also show that central exclusive production might be used as a discovery tool for the odderon. [less ▲]

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See detailThe Total Cross Section at the LHC: Models and Experimental Consequences
Cudell, Jean-René ULg

(2010)

I review the predictions of the total cross section for many models, and point out that some of them lead to the conclusion that the standard experimental analysis may lead to systematic errors much ... [more ▼]

I review the predictions of the total cross section for many models, and point out that some of them lead to the conclusion that the standard experimental analysis may lead to systematic errors much larger than expected. [less ▲]

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See detailOn the circular polarisation of light from axion-photon mixing
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

in Alimi, Jean-Michel; Füzfa, André (Eds.) INVISIBLE UNIVERSE: Proceedings of the Conference. AIP Conference Proceedings 1241. (2010)

From the analysis of measurements of the linear polarisation of visible light coming from quasars, the existence of large-scale coherent orientations of quasar polarisation vectors in some regions of the ... [more ▼]

From the analysis of measurements of the linear polarisation of visible light coming from quasars, the existence of large-scale coherent orientations of quasar polarisation vectors in some regions of the sky has been reported. Here, we show that this can be explained by the mixing of the incoming photons with nearly massless pseudoscalar (axion-like) particles in extragalactic magnetic fields. We present a new treatment in terms of wave packets and discuss its implications for the circular polarisation. [less ▲]

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See detailAxion-like particles and circular polarisation of active galactic nuclei
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

in Jaeckel, Joerg; Lindner, Axel; Redondo, Javier (Eds.) Proceedings of the 5th Patras Workshop on Axions, WIMPs and WISPs PATRAS 2009 (2010)

The measurements of the linear polarisation of visible light from quasars give strong evidence for large-scale coherent orientations of their polarisation vectors in some regions of the sky. We show that ... [more ▼]

The measurements of the linear polarisation of visible light from quasars give strong evidence for large-scale coherent orientations of their polarisation vectors in some regions of the sky. We show that these observations can be explained by the mixing of the photons with very light pseudoscalar (axion-like) particles in extragalactic magnetic fields during their propagation. We present a new treatment in terms of wave packets and discuss the circular polarisation. [less ▲]

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See detailNew analytic unitarization schemes
Cudell, Jean-René ULg; Predazzi, E.; Selyugin, O. V.

in Physical Review. D : Particles and Fields (2009), 79

We consider two well-known classes of unitarization of Born amplitudes of hadron elastic scattering. The standard class, which saturates at the black disk limit includes the standard eikonal ... [more ▼]

We consider two well-known classes of unitarization of Born amplitudes of hadron elastic scattering. The standard class, which saturates at the black disk limit includes the standard eikonal representation, while the other class, which goes beyond the black-disk limit to reach the full unitarity circle, includes the U matrix. It is shown that the basic properties of these schemes are independent of the functional form used for the unitarisation, and that U matrix and eikonal schemes can be extended to have similar properties. A common form of unitarisation is proposed interpolating between both classes. The correspondence with different nonlinear equations are also briefly examined. [less ▲]

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See detailHow precisely will the total cross section be measured at the LHC?
Cudell, Jean-René ULg; Selyugin, O. V.

in Physical Review Letters (2009), 102

It is very likely that hadronic scattering will enter a new regime at the LHC, as the black-disk limit is reached. This will lead to a severe change in the t dependence of the real part and of the slope ... [more ▼]

It is very likely that hadronic scattering will enter a new regime at the LHC, as the black-disk limit is reached. This will lead to a severe change in the t dependence of the real part and of the slope of the elastic scattering amplitude, and in turn this may bias the measurement of the total cross section. We examine this issue, and suggest new strategies to test the reliability of the total cross section measurements. [less ▲]

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See detailCentral exclusive production of dijets at hadronic colliders
Cudell, Jean-René ULg; Dechambre, Alice ULg; Hernandez, O. F. et al

in European Physical Journal C -- Particles & Fields (2009), 61(3), 369

In view of the recent diffractive dijet data from CDF run II, we critically re-evaluate the standard approach to the calculation of central production of dijets in quasi-elastic hadronic collisions. We ... [more ▼]

In view of the recent diffractive dijet data from CDF run II, we critically re-evaluate the standard approach to the calculation of central production of dijets in quasi-elastic hadronic collisions. We find that the process is dominated by the non-perturbative region, and that even perturbative ingredients, such as the Sudakov form factor, are not under theoretical control. Comparison with data allows us to fix some of the uncertainties. Although we focus on dijets, our arguments apply to other high-mass central systems, such as the Higgs boson. [less ▲]

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See detailFeatures of elastic scattering at small t at the LHC
Selyugin, O. V.; Cudell, Jean-René ULg

in AIP Conference Proceedings (2009), 1105

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See detailExclusive central production of dijets at hadronic colliders
Ivanov, Igor ULg; Cudell, Jean-René ULg; Dechambre, Alice et al

in AIP Conference Proceedings (2009), 1105

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See detailAxions & Polarisation of Quasars
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

Poster (2008, May 21)

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See detailAxions and polarisation of quasars
Payez, Alexandre ULg; Cudell, Jean-René ULg; Hutsemekers, Damien ULg

in AIP Conference Proceedings (2008), 1038

We present results showing that, thanks to axion-photon mixing in external magnetic fields, it is actually possible to produce an effect similar to the one needed to explain the large-scale coherent ... [more ▼]

We present results showing that, thanks to axion-photon mixing in external magnetic fields, it is actually possible to produce an effect similar to the one needed to explain the large-scale coherent orientations of quasar polarisation vectors in visible light that have been observed in some regions of the sky. [less ▲]

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See detailThe spin-flip amplitude in the impact-parameter representation
Selyugin, O. V.; Cudell, Jean-René ULg

in European Physical Journal. Special Topics (2008)

The impact-parameter representation of the spin-flip amplitude of hadron elastic scattering is examined in different unitarisation schemes, taking the Born term of the spin-flip amplitude from the Dubna ... [more ▼]

The impact-parameter representation of the spin-flip amplitude of hadron elastic scattering is examined in different unitarisation schemes, taking the Born term of the spin-flip amplitude from the Dubna Dynamical Model (DDM). It is shown that the basic properties of the unitarisation schemes are independent of the functional form used for unitarisation but heavily depend on the asymptotic value of the unitarised amplitude. [less ▲]

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See detailCentral Exclusive Dijet Production
Dechambre, Alice ULg; Cudell, Jean-René ULg; Ivanov, Igor ULg et al

in AIP Conference Proceedings (2008), 1038

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See detailUnitarisation and black-disk limit at the LHC in the presence of a hard pomeron
Cudell, Jean-René ULg; Selyugin, Oleg Viktorovich

in Physics Letters B (2008), 662(5), 417-423

Recent models of soft diffraction include a hard pomeron pole besides the usual soft term. Such models violate the black-disk limit around Tevatron energies, so that they need to be supplemented by a ... [more ▼]

Recent models of soft diffraction include a hard pomeron pole besides the usual soft term. Such models violate the black-disk limit around Tevatron energies, so that they need to be supplemented by a unitarisation scheme. Two standard schemes are considered in this Letter, and we show that they lead to an uncertainty at the LHC much larger than previously estimated. We also examine the signature of unitarisation on various small-t observables, the slope in t of the elastic cross section, or the ratio of the real to imaginary parts of the scattering amplitude, and show that the existence of a unitarised hard pomeron in soft scattering may be confirmed by LHC data. (C) 2008 Elsevier B.V. All rights reserved. [less ▲]

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See detailAnalytic properties of different unitarization schemes
Selyugin, O. V.; Cudell, Jean-René ULg; Predazzi, E.

in Eur. Phys. J. ST (2008), 162

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See detailExclusive J/psi and Upsilon hadroproduction and the QCD odderon
Bzdak, A.; Motyka, L.; Szymanowski, L. et al

in Physical Review. D (2007), 75(9),

We study pp and pp collisions which lead to the exclusive production of J/psi or Upsilon from the pomeron-odderon and the pomeron-photon fusion. We calculate scattering amplitudes of these processes in ... [more ▼]

We study pp and pp collisions which lead to the exclusive production of J/psi or Upsilon from the pomeron-odderon and the pomeron-photon fusion. We calculate scattering amplitudes of these processes in the lowest-order approximation and in the framework of k(perpendicular to) factorization. We present estimates of cross sections for the kinematic conditions of the Tevatron and of the LHC. [less ▲]

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See detailA dataset for hadron elastic scattering
Cudell, Jean-René ULg; Lenguel, Sasha; Martynov, E.

Textual, factual or bibliographical database (2007)

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See detailSaturation effects in elastic scattering at the LHC
Selyugin, O. V.; Cudell, Jean-René ULg

in Bartels, J.; Borras, K.; Diehl, M. (Eds.) et al 12th International Conference on Elastic and Diffractive Scattering (Blois Workshop) - Forward Physics and QCD (2007)

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