Measuring the Proton Beam Polarization From The Source To RHIC

Makdisi, Y. I.

doi:10.1063/1.2888120

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Polarized protons scattering on ions and protons probe the dependence of the hadronic interaction on spin not only for the soft processes discussed here but also for the large transverse momenta reactions that yield information on the helicity parton distribution functions [24]. Measurement of the level of proton beam polarization itself [25] relies upon an understanding of the helicity structure of the interactions of hydrogen and carbon nuclei at low momentum transfers, particularly the spin dependent couplings of the Pomeron [26]. Analyticity in the form of dispersion relations relates the low and high energy helicity amplitudes for particle and antiparticle forward scattering, emphasising the importance of the spin programmes at the Fermilab [8], BNL [27], RHIC [16], PAX [28], FAIR and CERN [29] facilities.…”

Section: Achievements and Future Progressmentioning

confidence: 98%

Spin effects in forward high energy proton scattering

Akchurin¹,

Buttimore²,

Penzo³

2011

J. Phys.: Conf. Ser.

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The relation between elastic amplitudes for polarized proton collisions and spindependent scattering observables is studied near the forward direction with a view to providing information on particular amplitudes at low values of momentum transfer. Such information has been singularly successful, for instance, in evaluating the amount of beam polarization achieved by the RHIC facility for its spin programme. A more extensive deployment of polarized facilities at a number of accelerators would permit a much deeper analysis of spin physics in a range of kinematic domains.

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Section: Achievements and Future Progressmentioning

confidence: 98%

Spin effects in forward high energy proton scattering

Akchurin¹,

Buttimore²,

Penzo³

2011

J. Phys.: Conf. Ser.

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“…The polarized proton programme at RHIC [9] has provided information on the energy dependence [10] of hadronic helicity flip amplitudes for protons scattering off hydrogen and carbon nuclei, particularly for single spin flip amplitudes [11]. Helium-4 targets have also been suggested for proton polarimetry [12].…”

Section: Introductionmentioning

confidence: 99%

Forward Helion Scattering and Neutron Polarization

Buttimore¹

2009

AIP Conference Proceedings

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The elastic scattering of spin half helium-3 nuclei at small angles can show a sufficiently large analyzing power to enable the level of helion polarization to be evaluated. As the helion to a large extent inherits the polarization of its unpaired neutron the asymmetry observed in helion collisions can be transformed into a measurement of the polarization of its constituent neutron. Neutron polarimetry therefore relies upon understanding the spin dependence of the electromagnetic and hadronic interactions in the region of interference where there is an optimal analyzing power.

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“…The measurement of proton beam polarization at BNL RHIC [6] needed a detailed analysis of helicity nonflip and flip amplitudes for electromagnetic and hadronic interactions. Polarized protons scattering on carbon fibre and hydrogen jet targets at low momentum transfer provided a sufficiently large spin asymmetry to enable polarimetry studies to be undertaken at an acceptable statistical level.…”

Section: Introductionmentioning

confidence: 99%

Forward collisions and spin effects in evaluating amplitudes

Buttimore¹

2011

AIP Conference Proceedings

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Abstract. Total cross sections and the phases of forward collision amplitudes form part of the early studies when a new energy window becomes available as is provided by the Large Hadron Collider. Enhancement of the forward elastic differential cross section above that expected from estimates of dispersion and optical theorem values may result from the presence of hadronic spin dependence in addition to effects induced by vacuum polarization contributions to the photon propagator. The elastic scattering of protons and ions at small angles is important in the evaluation of the luminosities of the corresponding incident beams and invites detailed examination. Polarization measurements taken at a number of high energies have yielded information on the extent of spin effects in hadronic scattering, particularly at the low momentum transfers related to diffraction.

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Measuring the Proton Beam Polarization From The Source To RHIC

Cited by 4 publications

References 4 publications

Spin effects in forward high energy proton scattering

Spin effects in forward high energy proton scattering

Forward Helion Scattering and Neutron Polarization

Forward collisions and spin effects in evaluating amplitudes

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