Polarization of Λ and produced by 800-GeV protons

Ramberg, E.; Bock, G. J.; Coleman, R.; Crisler, M.; Enagonio, J.; Ford, R.; Hsiung, Y.; Jensen, D. A.; Tschirhart, R.; Arisaka, K.; Roberts, D. A.; Slater, W.; Weaver, M.; Briere, R. A.; Cheu, E.; Harris, D. A.; Krolak, P.; Makoff, G.; McFarland, K. S.; Roodman, A.; Schwingenheuer, B.; Somalwar, S.; Wah, Y. W.; Winstein, B.; Winston, R.; Barker, A. R.; Swallow, E. C.; Collins, E. M.; Gollin, G. D.; Nakaya, T.; Yamanaka, T.; Gu, Ping; Haas, P.; Hogan, W. P.; Kim, S.; Matthews, J. N.; Myung, S. S.; Schnetzer, S.; Thomson, G. B.; Zou, Yanbiao

doi:10.1016/0370-2693(94)91397-8

Cited by 55 publications

(26 citation statements)

References 15 publications

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“…Calculated results of the polarization of Λ, P Λ , as a function of x F . Data are taken from[20][21][22]. D N N as a function of x F calculated using the proposed picture for the case that the correlation between the spin of the s T s [which forms together with the (u v d v ) P 0,0 the Λ] and the spin of the remaining u P v of the projectile (which forms together with thes T s the associated K + )…”

mentioning

confidence: 99%

Hyperon Polarization and Single Spin Left-Right Asymmetry in Inclusive Production Processes at High Energies

Liang

Boros

1997

Phys. Rev. Lett.

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It is shown that the polarization of hyperons observed in high energy collisions using unpolarized hadron beams and unpolarized nucleon or nuclear targets is closely related to the left-right asymmetries observed in single spin inclusive hadron production processes. The relationship is most obvious for the production of the hyperons which have only one common valence quark with the projectile. Examples of this kind are given. Further implications of the existence of large polarization for hyperon which has two valence quarks in common with the projectile and their consequences are discussed. A comparison with the available data is made. Further tests are suggested.

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confidence: 99%

Hyperon Polarization and Single Spin Left-Right Asymmetry in Inclusive Production Processes at High Energies

Liang

Boros

1997

Phys. Rev. Lett.

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“…An indication of such a possibility comes from experiments in which particles e.g. Σ-hyperons [25] and Λ-hyperons [26] produced in the collisions of high energy unpolarized protons with an unpolarized solid target show a significant degree of polarization. Of course, the hyperon production cannot be directly compared to antiproton production because in the hyperon case the polarization is induced due to the strange quarks behavior which are not present in the antiproton case.…”

Section: Chapter 1 Motivationmentioning

confidence: 99%

Drift Chamber Calibration and Track Reconstruction in the P349 Antiproton Polarization Experiment

Alfs¹,

Głowacz²,

Moskal³

et al. 2017

Acta Phys. Pol. B

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“…The first determination of the Σ 0 polarization [31] yields a value of « 30% with opposite sign [20] p+Be (Cu,W)Ñ Λ+X 12.9 GeV/c CERN ISR 1987 [21] p+p Ñ Λ+X ? s = 3-61 GeV AGS 1988 13.5 GeV/c [7] p+Be Ñ Λ+X 13.5 GeV/c AGS 1988 18.5 GeV/c [7] p+Be Ñ Λ+X 18.5 GeV/c AGS 1996 [22,23] p+p Ñ pK`Λ N(π`π´) 27.5 GeV/c FNAL 1989 [24] p+Be (Cu,Pb) Ñ Λ+X 400.9 GeV/c FNAL 1991 [25] p+p Ñ pK`Λ 800.9 GeV/c FNAL 1994 [26] p+Be Ñ Λ+X 800.9 GeV/c DISTO 1998 [4] p+p Ñ pK`Λ 3.67 GeV/c CERN NA48 1999 [27] p+Be Ñ Λ+X ? s = 61 GeV HERA-B 2006 [28] p+C(W) Ñ Λ+X 920.9 GeV/c HADES 2014 [3] p+Nb Ñ Λ+X 4.34 GeV/c ATLAS 2015 [29] p+p Ñ Λ+X ?…”

Section: Comparison With Existing Datamentioning

confidence: 99%

Measurement of polarization observables of the associated strangeness production in proton proton interactions

et al. 2016

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Abstract. The Λ polarization, the analyzing power, and the Λ spin transfer coefficient of the reaction pp Ñ pK`Λ were measured at beam momenta of 2.70 GeV/c and 2.95 GeV/c corresponding to excess energies of 122 MeV and 204 MeV. While the analyzing power and the spin transfer coefficient do not change significantly with the excess energy, the Λ polarization varies strongly and changes its sign. As this is the first measurement of polarization observables below an excess energy of 200 MeV, the change of the sign of the Λ polarization was not observed before. The high statistics of the data (« 200 k events for each momentum) enables detailed studies of the dependence of the Λ polarization and the analyzing power on the center of mass momentum of the particles. The results of the spin transfer coefficient are in qualitative agreement with the DISTO experiment. The Λ polarization data of 2.95 GeV/c are only conform with the DISTO experiment, while both the 2.70 GeV/c and 2.95 GeV/c data differ strongly from all previous measurements, whether exclusive or inclusive.

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Polarization of Λ and produced by 800-GeV protons

Cited by 55 publications

References 15 publications

Hyperon Polarization and Single Spin Left-Right Asymmetry in Inclusive Production Processes at High Energies

Hyperon Polarization and Single Spin Left-Right Asymmetry in Inclusive Production Processes at High Energies

Drift Chamber Calibration and Track Reconstruction in the P349 Antiproton Polarization Experiment

Measurement of polarization observables of the associated strangeness production in proton proton interactions

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