The deuteron in high-energy physics

Bergström, Lars; Fredriksson, Sverker

doi:10.1103/revmodphys.52.675

Cited by 25 publications

(4 citation statements)

References 119 publications

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“…Using deuterium target, it is possible to study the hiddencolor excitations of the deuteron [168]. There are five distinct color-singlet representations of the six quark valence state of the deuteron, only one of which, the n − p state, is considered in conventional nuclear physics (for a review see [169]). In PQCD all five Fock states mix by gluon exchange; at short distances the deuteron distribution amplitude evolves to equal admixtures of the five states.…”

Section: Very Backward Physicsmentioning

confidence: 99%

Physics opportunities of a fixed-target experiment using LHC beams

et al. 2013

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We outline the many physics opportunities offered by a multi-purpose fixed-target experiment using the proton and lead-ion beams of the LHC extracted by a bent crystal. In a proton run with the LHC 7 TeV beam, one can analyze pppp, pdpd and pApA collisions at center-of-mass energy View the MathML sourcesNN≃115GeV and even higher using the Fermi motion of the nucleons in a nuclear target. In a lead run with a 2.76 TeV-per-nucleon beam, View the MathML sourcesNN is as high as 72 GeV. Bent crystals can be used to extract about 5×108 protons/s; the integrated luminosity over a year reaches 0.5 fb−1 on a typical 1 cm long target without nuclear species limitation. We emphasize that such an extraction mode does not alter the performance of the collider experiments at the LHC. By instrumenting the target-rapidity region, gluon and heavy-quark distributions of the proton and the neutron can be accessed at large xx and even at xx larger than unity in the nuclear case. Single diffractive physics and, for the first time, the large negative-xFxF domain can be accessed. The nuclear target-species versatility provides a unique opportunity to study nuclear matter versus the features of the hot and dense matter formed in heavy-ion collisions, including the formation of the quark-gluon plasma, which can be studied in PbAPbA collisions over the full range of target-rapidity domain with a large variety of nuclei. The polarization of hydrogen and nuclear targets allows an ambitious spin program, including measurements of the QCD lensing effects which underlie the Sivers single-spin asymmetry, the study of transversity distributions and possibly of polarized parton distributions. We also emphasize the potential offered by pApA ultra-peripheral collisions where the nucleus target AA is used as a coherent photon source, mimicking photoproduction processes in epep collisions. Finally, we note that WW and ZZ bosons can be produced and detected in a fixed-target experiment and in their threshold domain for the first time, providing new ways to probe the partonic content of the proton and the nucleus

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Section: Very Backward Physicsmentioning

confidence: 99%

Physics opportunities of a fixed-target experiment using LHC beams

et al. 2013

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“…From electron scattering off light nuclei there is evidence for non nucleonic components in the nucleus, i.e. for sizable probabilities of six-and nine-quark clusters in addition to the usual three-quark nucleonic cluster (97)(98)(99)(100). Because ofthe existence of such clusters, F�(x) will remain finite at x> 1 above the kinematical limit for free nucleon scattering.…”

Section: Comparison Of Iron and Deuterium Structure Functionsmentioning

confidence: 94%

Muon Scattering

Drees¹,

Montgomery²

1983

Annu. Rev. Nucl. Part. Sci.

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“…There are five distinct color-singlet representations of the six-quark valence state of the deuteron. Only one of these, the n − p state, is considered in the conventional nuclear physics (for a review see [29]), while all five Fock states mix by gluon exchange in pQCD. These novel "hidden-color" components [30] can be studied at AFTER by probing parton distributions in inclusive reactions requiring high x (≥ 1) and by studying the diffractive dissociation of the deuteron in its rapidity domain [31] in Pbd collisions.…”

Section: Studies For (Semi-)exclusive Physics At Aftermentioning

confidence: 99%

Spin and diffractive physics with a fixed-target experiment at the LHC (AFTER@LHC)

Lorcé

Anselmino

Arnaldi

et al. 2013

AIP Conference Proceedings

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We report on the spin and diffractive physics at a future multi-purpose fixed-target experiment with proton and lead LHC beams extracted by a bent crystal. The LHC multi-TeV beams allow for the most energetic fixed-target experiments ever performed, opening new domains of particle and nuclear physics and complementing that of collider physics, in particular that of RHIC and the EIC projects. The luminosity achievable with AFTER using typical targets would surpass that of RHIC by more than 3 orders of magnitude. The fixed-target mode has the advantage to allow for measurements of single-spin asymmetries with polarized target as well as of single-diffractive processes in the target region.

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The deuteron in high-energy physics

Abstract: The deuterium nucleus plays an important role in several branches of high-energy physics. We review its present status as a neutron source, a relativistic bound state, a collective six-quark state and a double scatterer.

Cited by 25 publications

References 119 publications

Physics opportunities of a fixed-target experiment using LHC beams

Physics opportunities of a fixed-target experiment using LHC beams

Muon Scattering

Spin and diffractive physics with a fixed-target experiment at the LHC (AFTER@LHC)

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