HEPData Search

The Collins and Sivers asymmetries for charged hadrons produced in deeply inelastic scattering on transversely polarised protons have been extracted from the data collected in 2007 with the CERN SPS muon beam tuned at 160 GeV/c. At large values of the Bjorken x variable non-zero Collins asymmetries are observed both for positive and negative hadrons while the Sivers asymmetry for positive hadrons is slightly positive over almost all the measured x range. These results nicely support the present theoretical interpretation of these asymmetries, in terms of leading-twist quark distribution and fragmentation functions.

36 data tables

Table 1

The COLLINS asymmetry for positively charged hadrons as a function of X.

Table 2

The COLLINS asymmetry for positively charged hadrons as a function of Z.

Table 3

The COLLINS asymmetry for positively charged hadrons as a function of PT.

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Measurement of the tensor analyzing power A(yy) in inclusive breakup of 9-GeV/c deuterons on carbon at large transverse momenta of protons.

Afanasev, S.V. ; Arkhipov, V.V. ; Azhgirei, L.S. ; et al.

Phys.Lett.B 434 (1998) 21-27, 1998.

Inspire Record 473506 DOI 10.17182/hepdata.39334

The tensor analyzing power A yy in inclusive breakup of 9 GeV/c deuterons on carbon has been measured at the detected proton angle of 85 mr. The analyzing power remains positive at the highest measured momentum of the proton in definite contradiction with the predictions of the existing models. The vector analyzing power A y has been obtained simultaneously with A yy .

1 data table

Table 1

No description provided.

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.

Measurement of the tensor analyzing power for the C-12 (d, p) reaction at P(d) = 9.1-GeV/c and zero angle proton emission. (In Russian)

Ableev, V.G. ; Vizireva, L. ; Dzhemuchadze, S.V. ; et al.

Dubna JINR - 4(43)-90 (90,rec.Oct.) 5-9.C, 1990.

Inspire Record 304748 DOI 10.17182/hepdata.48496

None

1 data table

Table 1

Proton momentum in deuteron rest frame (ANTILAB).

Measurements of double-helicity asymmetries in inclusive $J/\psi$ production in longitudinally polarized $p+p$ collisions at $\sqrt{s}=510$ GeV

The PHENIX collaboration Adare, A. ; Aidala, C. ; Ajitanand, N.N. ; et al.

Phys.Rev.D 94 (2016) 112008, 2016.

Inspire Record 1467456 DOI 10.17182/hepdata.82575

We report the double helicity asymmetry, $A_{LL}^{J/\psi}$, in inclusive $J/\psi$ production at forward rapidity as a function of transverse momentum $p_T$ and rapidity $|y|$. The data analyzed were taken during $\sqrt{s}=510$ GeV longitudinally polarized $p

1 data table

Table 1

$A_{LL}^{J/\psi}$ as a function of $p_T$ or $|y|$. $N_{J/\psi}^{2\sigma}$ is the $J/\psi$ counting within its $2\sigma$ mass window. The column of Type A systematic uncertainties are a statistically weighted quadratic combination of the background fraction and run grouping uncertainties. $\Delta A_{LL}$ (Rel. Lumi.) is the global systematic uncertainty from relative luminosity measurements. $\Delta A_{LL}$ (Polarization) is the systematic uncertainty from the beam polarization measurement: a zero indicates an uncertainty $< 0.001$.

One-spin pion asymmetry in the d(pol.) + A --> pi+- + X processes near Theta(pi) = 90-degrees.

Averichev, G.S. ; Agakishiev, G. ; Asanova, M.E. ; et al.

Dubna JINR - 1(69)-95 (95/04,rec.Jul.) 27-36, 1995.

Inspire Record 404986 DOI 10.17182/hepdata.70491

None

1 data table

Table 1

No description provided.

POLARIZATION OF EXCLUSIVE LAMBDA0 PARTICLES EMITTED FROM C, AL, CU, CD, PB NUCLEI AT 90-DEGREES IN LABORATORY SYSTEM. (IN RUSSIAN)

Vorobev, L.S. ; Gavrilov, V.B. ; Goryainov, N.A. ; et al.

MOSCOW INST. THEOR. EXP. PHYS. - ITEF-88-113 (88,REC.JAN.89) 18p, 1988.

Inspire Record 270426 DOI 10.17182/hepdata.9910

None

2 data tables

Table 1

No description provided.

Table 2

No description provided.

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MEASUREMENT OF THE POLARIZATION ROTATION COEFFICIENT A IN THE P P SCATTERING AT 970-MEV. (IN RUSSIAN)

MEASUREMENTS OF LAMBDA0 POLARIZATION PRODUCED BY 40-GeV NEUTRONS ON CARBON NUCLEI IN INCLUSIVE PROCESSES

Measurement of Asymmetry of Photoproduction of Positive Pions on Protons by Linearly Polarized Photons in 250-MeV-500-MeV Energy Range

Measurement of the Collins and Sivers asymmetries on transversely polarised protons

Measurement of the tensor analyzing power A(yy) in inclusive breakup of 9-GeV/c deuterons on carbon at large transverse momenta of protons.

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

Measurement of the tensor analyzing power for the C-12 (d, p) reaction at P(d) = 9.1-GeV/c and zero angle proton emission. (In Russian)

Measurements of double-helicity asymmetries in inclusive $J/\psi$ production in longitudinally polarized $p+p$ collisions at $\sqrt{s}=510$ GeV

One-spin pion asymmetry in the d(pol.) + A --> pi+- + X processes near Theta(pi) = 90-degrees.

POLARIZATION OF EXCLUSIVE LAMBDA0 PARTICLES EMITTED FROM C, AL, CU, CD, PB NUCLEI AT 90-DEGREES IN LABORATORY SYSTEM. (IN RUSSIAN)