The ATLAS Forward Physics Program

Royon, Christophe

doi:10.48550/arxiv.1008.3207

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…The charm and bottom mass are set to 1.5 and 4. 75 GeV respectively, and the CTEQ6.1 [38] proton parton distribution functions are employed.…”

Section: Heavy Flavormentioning

confidence: 99%

“…In addition, it is easier to remove other photoproduction backgrounds than in A+A collisions characterized by additional photon exchanges which lead to forward neutron emission. It is also possible to tag the scattered proton using Roman Pot detectors (CMS/TOTEM [74], ATLAS/ALFA [75], FP420 [76]), allowing full kinematic reconstruction by separating the momentum transfers from the proton and the ion. The advantage of p+A with respect to p+p UPCs is threefold.…”

Section: Ultra-peripheral Collisionsmentioning

confidence: 99%

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Proton–nucleus collisions at the LHC: scientific opportunities and requirements

Salgado

Álvarez-Muñiz

Arleo

et al. 2011

J. Phys. G: Nucl. Part. Phys.

153

116

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Proton-nucleus (p+A) collisions have long been recognized as a crucial component of the physics programme with nuclear beams at high energies, in particular for their reference role to interpret and understand nucleus-nucleus data as well as for their potential to elucidate the partonic structure of matter at low parton fractional momenta (small-x). Here, we summarize the main motivations that make a proton-nucleus run a decisive ingredient for a successful heavy-ion programme at the Large Hadron Collider (LHC) and we present unique scientific opportunities arising from these collisions. We also review the status of ongoing discussions about operation plans for the p+A mode at the LHC.

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“…The charm and bottom mass are set to 1.5 and 4. 75 GeV respectively, and the CTEQ6.1 [38] proton parton distribution functions are employed.…”

Section: Heavy Flavormentioning

confidence: 99%

Section: Ultra-peripheral Collisionsmentioning

confidence: 99%

Proton–nucleus collisions at the LHC: scientific opportunities and requirements

Salgado

Álvarez-Muñiz

Arleo

et al. 2011

J. Phys. G: Nucl. Part. Phys.

153

116

View full text Add to dashboard Cite

show abstract

“…The resolution and the acceptance of the hadron tagging detector are fixed by the LHC high-lunimosity beam optics. The hadron tagging detectors use the FPtract program [54][55][56] to track the path of the hadrons through the LHC lattice so as to completely find out the acceptance. The acceptance of the forward detectors is controlled by the distance of the active edge of the detector from the beam, which fixes the smallest measurable energy loss of the outgoing hadrons, and the space of the LHC beam elements between the interaction point and the forward detector.…”

Section: A Forward Hadron Taggingmentioning

confidence: 99%

Photoproduction of J/ψ with forward hadron tagging in hadronic collisions

2019

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We study the photoproduction of J/ψ using the NRQCD formalism with forward hadron tagging at the Large Hadron Collider. We estimate the total cross sections and event rates with and without nuclear shadowing effects in high energy proton-proton, proton-nucleus and nucleus-nucleus collisions. Our results show that the processes which involve J/ψ photoproduction depend on the choice of forward detector acceptances ξ. Under some precise cut of p J/ψ T and z J/ψ kinematic variables, we find that the distributions of photoproduction of J/ψ are led by the Fock state 1 S1 . The total cross sections and event rates will be smaller if the nuclear shadowing effects are considered. The processes give a crucial photoproduction signature at the LHC with forward detector acceptances. The exploration and the detection of the interactions will be useful for studying the mechanism of heavy quarkonium production. I. INTRODUCTIONSince the discovery of heavy quarkonia in the mid-1970s, their production and decay become reliable tools to improve our understanding of theoretical aspects of quantum chromodynamics (QCD) from the hard region, where the strong interaction is realized with a large momentum transfer, to the soft region, where the strong interaction is carried out with a small momentum transfer. These production and decay of heavy quarkonia are studied under the non-relativistic quantum chromodynamics (NRQCD) due to the large mass of heavy quarks (m c ∼ 1.5 GeV, m b ∼ 4.75 GeV). The full description of the theoretical framework was proposed by Bodwin, Braaten and Lepage(BBL) [1]. It factorizes the quarkonium production in terms of short distance QCD cross sections and long distance matrix elements (LDMEs). The former can be pertubatively evaluated in series of the running coupling constant α s while the latter is the probability for a heavy QQ pair with spin S, orbital angular momentum L, total angular momentum J, and color multiplicity a = 1 (color-singlet), 8 (color-octet) to evolve into a physical heavy quarkonium state. The value of LDMEs can either be calculated by utilizing non-perturbative methods or extracted phenomenologically from data [2], i.e., QCD lattice simulations or measurements in some production processes. The QQ pair is generated from the partonic interaction at short distances in color singlet (CS) or in color-octet (CO) states and hadronizes into physical CS observable by emitting soft gluons non-perturbatively. The effect of LDME contribution has a hierarchically ordered scaling with v [3], v being the nonrelativistic velocity of Q orQ in the QQ rest frame. The essence of this theory can now be systematically shortened by the double expansion in powers of α s and v. A lot of phenomenological approaches of this framework are meticulously narrated in Refs [4,5,7,8], taking into account the complete and spanned structure of the QQ Fock space by the state n = 2S+1 L (a) J . However, the golden age of the NRQCD theory has been to address the limitations of the early proposed models from which it establishes...

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The ATLAS Forward Physics Program

Abstract: We describe the ATLAS Forward Physics Program at low luminosity using the rapidity gap method and a dedicated detector called ALFA to tag the protons. We also describe the physics topics of the ATLAS Forward Physics Project at high instantaneous luminosity.

Cited by 2 publications

References 3 publications

Proton–nucleus collisions at the LHC: scientific opportunities and requirements

Proton–nucleus collisions at the LHC: scientific opportunities and requirements

Photoproduction of J/ψ with forward hadron tagging in hadronic collisions

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