Effects of transverse polarization components in parity tests with longitudinally polarized nucleons

Simonius, M.; Henneck, R.; Jacquemart, Ch.; Lang, J.; Haeberli, W.; Weddigen, Ch.

doi:10.1016/0029-554x(80)90060-9

Cited by 19 publications

(14 citation statements)

References 6 publications

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“…This last correction was given by ys, where y is the sensitivity to transverse polarization and E is the spatial first moment of the beam polarization distribution x and y are particle coordinates at the collimator, R,(x, y) and R,(x, y) are the transverse polarization components for a given beam helicity, and B(x, y) represents the intensity of the beam. It can be seen that a transverse component of polarization that averages to zero can produce a spurious parity signal (4,33).…”

Section: Experimental Methodsmentioning

confidence: 98%

Parity nonconservation in proton scattering at higher energies

Mischke¹

1988

Can. J. Phys.

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Parity-nonconservation experiments In the scattering of longitudinally polarized protons at incident proton momenta of 1.5 and 6 GeV/c are examined. These experiments indicate a change w~th energy of the total cross section correlated with proton helicity that was unexpected. This energy dependence is due to the strong part of the Interaction and may indicate the role of a diquark component In the nucleon. New experiments at higher energies are needed to confirm such a model. Future experiments can benefit from an analysis of sources of systematic error that have been encountered In the experiments discussed here.Des exptriences sur la non-conservation de la pant6 dans la diffusion de protons polarises longltudinalement pour des protons incidents de 1,5 et 6 GeV/c sont examinees. Ces exptriences indiquent un changement de la section efficace totale en fonction de I'energie par rapport a I'hClicitC du proton qui n'ttait pas attendu. Cette dtpendance en Cnergle est due i la partie forte de I'lnteraction et peut ~ndiquer le r6le de la composante diquark dans le nuclton. De nouvelles experiences a des energies plus tlevees sont dtsirables pour confirmer un tel modele. Des experiences futures peuvent bCnCficier de l'analyse des sources d'erreurs systtmatiques qui ont Ct C rencontrees dans l'experience discutte ici Can J Phys 66,495 (1988) [Traduit par la @ue]

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Section: Experimental Methodsmentioning

confidence: 98%

Parity nonconservation in proton scattering at higher energies

Mischke¹

1988

Can. J. Phys.

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“…It is the only effect that causes a significant correction to R. The mathematical treatment is given in ref. 22. This paper shows that first-order corrections for transverse polarization can be made if the polarization and intensity profiles are measured separately in two planes, even without information about correlations.…”

Section: Residual Transverse Polarizationmentioning

confidence: 96%

“…The real problem is that the polarization vector in the beam is not perfectly uniform in direction, sc the residual transverse polarization components p, and pJ var) with position within the beam. Particularly dangerous is a firs moment of p, (or p , ) with respect to y (or x), i.e., a lineal variation of the residual polarization (22). The situation is eas) to understand.…”

Section: Residual Transverse Polarizationmentioning

confidence: 97%

Parity violation in proton scattering: low energy region

Haeberli¹

1988

Can. J. Phys.

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Measurements of the parity-violating longitudinal analyzing power, A,, in the scattering of low-energy protons (Ep < 50 MeV) are reviewed. The experiments are based on the determination of the relative scattering cross sections a+ and a-for incident protons of positive and hegative helicity, respect~vely. The first results were reported from Los Alamos, where a significant analyzing power [ A z = (-1.7 ? 0.8) X was found for p-p scattering at 15 MeV. All other results are for a proton energy near 45 MeV, primarily by the group working at Schweizerisches Instrtut fiir Nuklearforschung, which recently reported a new, very accurate result for p-p scattering of A, = (-1.50 -C 0.22) X A review is presented of the methods that have been developed by this group over the last 10 years to reduce systematic errors in the determination of A, to a few times lop9.On passe en revue les mesures du pouvoir d'analyse longitudinal A, qui ne respectent pas la paritt dans la diffusion de protons i basses tnergies (Ep < 50 MeV). Les expkriences sont bastes sur la dttermination des sections efficaces relatives de diffusion a + et a-pour des protons incidents d'helicitt positive et ntgative. Les premiers rtsultats furent rapportts par Los Alamos, o t~ un pouvoir d'analyse significatif [ A , = (-1.7 2 0,8) X fut trouve pour la diffusion p-p a 15 MeV. Tous les autres rksultats sont ii une energie des protons de prks de 45 MeV, obtenus prlncipalement par le groupe travaillant a Schweizerisches Institut fiir Nuklearforschung, qui a rkcemment rapport6 un nouveau resultat trks prkcis pour la diffusion p-p de A, = (-1,50 2 0,22) X lo-'. On prtsente une revue des mithodes qui ont CtC dtvelopptes par ce groupe durant les 10 dernikres anntes pour rtduire les erreurs systtmatiques dans la determination de A: it quelques-parties dans [Traduit par la revue] Can 1. Phys 66. 485 (1988)

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“…These quantities are the average transverse components of polarization which given an effect proportional to displacement from the detector symmetry axis, < x >< P y > and < y >< P x >, and the intrinsic first moments of polarization, < xP y > and < yP x >, which will contribute even if the proton beam is perfectly aligned with the apparatus. Higher order terms and in-plane terms (such as < xP x > and < yP y >) should be negligible [12] [2].…”

Section: Specifications and Designmentioning

confidence: 99%

“…Later, it was recognized that even if the transverse polarization components of a finite-sized beam averaged to zero, an inhomogeneous distribution of the transverse polarization over the beam profile could result in a significant contribution to the measured A z [12] [13].…”

Section: Introductionmentioning

confidence: 99%

A monitor of beam polarization profiles for the TRIUMF parity experiment

Berdoz

Bírchall

Bland

et al. 2001

Nuclear Instruments and Methods in Physics Research Section A:

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TRIUMF experiment E497 is a study of parity violation in pp scattering at an energy where the leading term in the analyzing power is expected to vanish, thus measuring a unique combination of weak-interaction flavour conserving terms. It is desired to reach a level of sensitivity of 2 × 10 −8 in both statistical and systematic errors. The leading systematic errors depend on transverse polarization components and, at least, the first moment of transverse polarization. A novel polarimeter that measures profiles of both transverse components of polarization as a function of position is described.

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Effects of transverse polarization components in parity tests with longitudinally polarized nucleons

Cited by 19 publications

References 6 publications

Parity nonconservation in proton scattering at higher energies

Parity nonconservation in proton scattering at higher energies

Parity violation in proton scattering: low energy region

A monitor of beam polarization profiles for the TRIUMF parity experiment

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