HEPData Search

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Measurement of the tensor analyzing power T(20) for d (polarized) + C-12 ---> p (0-degrees) + X in the region of internal momenta in the deuteron up to 1-GeV/c

Aono, T. ; Chernykh, E.V. ; Dzikowski, T. ; et al.

Phys.Rev.Lett. 74 (1995) 4997-5000, 1995.

Inspire Record 379428 DOI 10.17182/hepdata.19648

The tensor analyzing power T20 for the reaction d↑+12C→p(0°)+X has been measured in the region of proton internal momenta k in light-cone dynamics up to 1 GeV/ c. Measurements have been carried out at Dubna Synchrophasotron with polarized deuteron beam at deuteron momenta up to 9 GeV/ c. When k increases the experimental values of T20 have a tendency to approach the value ( −0.3) obtained by the calculation based on the reduced nuclear amplitude method in which the quark degrees of freedom are taken into account.

1 data table

Table 1

The momentum K, called momentum in light-cone dynamics, is expressed by thefollowing formula k**2=mt**2/(4*alpha*(1-alpha))-m**2,with mt**2=kt**2+m**2 wh ere kt is the proton transverse momentum.The light-cone variable alpha is the p art of the deuteron momentum carried by the proton in the infinite momentum frameand is expressed by the formula alpha=(Ep+Pp)/(Ed+Pd).

A Search for jet handedness in hadronic Z0 decays

The SLD collaboration Abe, K. ; Abt, I. ; Ahn, C.J. ; et al.

Phys.Rev.Lett. 74 (1995) 1512-1516, 1995.

Inspire Record 378343 DOI 10.17182/hepdata.19666

We have searched for signatures of polarization in hadronic jets from $Z~0 \rightarrow q \bar{q}$ decays using the ``jet handedness'' method. The polar angle asymmetry induced by the high SLC electron-beam polarization was used to separate quark jets from antiquark jets, expected to be left- and right-polarized, respectively. We find no evidence for jet handedness in our global sample or in a sample of light quark jets and we set upper limits at the 95\% C.L. of 0.063 and 0.099 respectively on the magnitude of the analyzing power of the method proposed by Efremov {\it et al.}

1 data table

Table 1

Polarized E- beam. Events were classified as being of light or heavy flavors based on impact parameters of charged tracks measured in the vertex detector. Jet handedness are measured for helicity-based and chirality-based analysis (seetext). C=95PCT CL indicates the upper limits at the 95 PCT C.L. on the magnitudes.

Angular dependence of the beam and target analyzing powers a(oono) and A(ooon) in n p elastic scattering between 0.477-GeV and 0.940-GeV

Ball, J. ; Chesny, P. ; Combet, M. ; et al.

Nucl.Phys.A 559 (1993) 477-488, 1993.

Inspire Record 33734 DOI 10.17182/hepdata.36610

We present a total of 273 independent data points of the analyzing powers A oono (nP) and A ooon (nP) in a large angular interval at four energies between 0.477 and 0.940 GeV. The SATURNE II polarized beam of free neutrons obtained from the break-up of polarized deuterons was scattered on the polarized Saclay frozen-spin proton target. Part of the data was obtained with a CH 2 target. A comparison of the two measured observables allows one to determine the polarization of the neutron beam. The present results provide an important contribution to any future theoretical or phenomenological analysis.

8 data tables

Table 1

No description provided.

Table 2

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Table 3

Data from 97.7 to 123.4 degrees are combined beam and target analyzing powers.

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Proton polarization from pi+ absorption in He-3

MayTal-Beck, S. ; Aclander, Jaime L.S. ; Altman, A. ; et al.

Phys.Rev.Lett. 68 (1992) 3012-3015, 1992.

Inspire Record 339565 DOI 10.17182/hepdata.19868

We present the first polarization measurements for pion absorption on a nucleus heavier than the deuteron. The polarization of protons resulting from π+ absorption in the He3 was measured at bombarding energies of 120 and 250 MeV. Protons from absorption in a quasideuteron were selected by applying kinematical constraints. A significant discrepancy was observed between the experimental results and theoretical predictions. At 120 MeV the measured polarizations for He3 are consistent with those of the deuteron. At 250 MeV the angular distribution of the polarization is significantly different than for the deuteron, showing sensitivity to the nuclear density, and thus may be sensitive to short range correlations between nucleons.

4 data tables

Table 1

No description provided.

Table 2

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Table 3

No description provided.

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Measurement of the tensor analyzing power T(20) in inclusive deuteron breakup at 9-GeV/c on hydrogen and carbon

Azhgirey, L.S. ; Afanasyev, S.V. ; Chernykh, E.V. ; et al.

Phys.Lett.B 387 (1996) 37-42, 1996.

Inspire Record 328522 DOI 10.17182/hepdata.28341

The tensor analyzing power T 20 in inclusive deuteron breakup at 9 GeV/c and 0° on hydrogen and carbon targets up to internal momenta k of the proton in the deuteron of ∼ 1 GeV/c has been measured. The analyzing power remains negative up to the highest measured values of k , and is in definite disagreement with predictions from several theoretical models. A systematic difference between T 20 for deuteron breakup on hydrogen and carbon is observed.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Neutral strange particle production in sulphur sulphur and proton sulphur collisions at 200-GeV/nucleon

The NA35 collaboration Bartke, J. ; Bialkowska, H. ; Bock, R. ; et al.

Z.Phys.C 48 (1990) 191-200, 1990.

Inspire Record 304994 DOI 10.17182/hepdata.15177

The production of Λ,$\bar \Lambda$ andKs0 has been studied in 200 GeV/nucleonp+S and S+S collisions in the streamer chamber of the NA35 experiment at the CERN SPS. Significant enhancement of the multiplicities of all observed strange particles relative to negative hadrons was observed in central S+S collisions, as compared top+p andp+S collisions. The latter collisions show no overall (relative) strangeness enhancement overp+p, but the rapidity distributions and hadron multiplicities indicate some secondary cascading production of Λ particles in thep+S andp+Au collisions. The Λ polarization in central S+S collisions was found to be compatible with zero up topT=2 GeV/c.

15 data tables

Table 1

Tranverse kinetic energy spectra of neutral strange particles in P SU collisions.

Table 2

Tranverse kinetic energy spectra of neutral strange particles in P SU collisions.

Table 3

Tranverse kinetic energy spectra of neutral strange particles in SU SU collisions.