HEPData Search

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Spin asymmetry A(1)(d) and the spin-dependent structure function g1(d) of the deuteron at low values of x and Q**2.

The Compass collaboration Ageev, E.S. ; Alexakhin, V.Yu. ; Alexandrov, Yu. ; et al.

Phys.Lett.B 647 (2007) 330-340, 2007.

Inspire Record 742118 DOI 10.17182/hepdata.48534

We present a precise measurement of the deuteron longitudinal spin asymmetry A_1^d and of the deuteron spin-dependent structure function g_1^d at Q^2 < 1 GeV^2 and 4*10^-5 < x < 2.5*10^-2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A_1^d and g_1^d are found to be consistent with zero in the whole range of x.

1 data table

Table 1

Measured values of A1 and G1 at mean values of X, Q**2 and Y.

First measurement of the transverse spin asymmetries of the deuteron in semi-inclusive deep inelastic scattering.

The COMPASS collaboration Alexakhin, V.Yu. ; Alexandrov, Yu. ; Alexeev, G.D. ; et al.

Phys.Rev.Lett. 94 (2005) 202002, 2005.

Inspire Record 677550 DOI 10.17182/hepdata.48553

First measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarized 6-LiD target are presented. The data were taken in 2002 with the COMPASS spectrometer using the muon beam of the CERN SPS at 160 GeV/c. The Collins asymmetry turns out to be compatible with zero, as does the measured Sivers asymmetry within the present statistical errors.

6 data tables

Table 1

Asymmetries as a function of X for LEADING hadrons.

Table 2

Asymmetries as a function of Z for LEADING hadrons.

Table 3

Asymmetries as a function of PT for LEADING hadrons.

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Measurement of the spin structure of the deuteron in the DIS region.

The COMPASS collaboration Ageev, E.S. ; Alexakhin, V.Yu. ; Alexandrov, Yu. ; et al.

Phys.Lett.B 612 (2005) 154-164, 2005.

Inspire Record 675838 DOI 10.17182/hepdata.48552

We present a new measurement of the longitudinal spin asymmetry A_1^d and the spin-dependent structure function g_1^d of the deuteron in the range 1 GeV^2 < Q^2 < 100 GeV^2 and 0.004< x <0.7. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarised muon beam and a large polarised 6-LiD target. The results are in agreement with those from previous experiments and improve considerably the statistical accuracy in the region 0.004 < x < 0.03.

13 data tables

Table 1

Measured values of A1 as a function of Q**2 at a mean X value of 0.0051.

Table 2

Measured values of A1 as a function of Q**2 at a mean X value of 0.0079.

Table 3

Measured values of A1 as a function of Q**2 at a mean X value of 0.0141.

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rivet Analysis
Tuning and test of fragmentation models based on identified particles and precision event shape data.

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.

Z.Phys.C 73 (1996) 11-60, 1996.

Inspire Record 424112 DOI 10.17182/hepdata.47800

Event shape and charged particle inclusive distributions are measured using 750000 decays of the Z to hadrons from the DELPHI detector at LEP. These precise data allow a decisive confrontation with models of the hadronization process. Improved tunings of the JETSET, ARIADNE and HERWIG parton shower models and the JETSET matrix element model are obtained by fitting the models to these DELPHI data as well as to identified particle distributions from all LEP experiments. The description of the data distributions by the models is critically reviewed with special importance attributed to identified particles.

56 data tables

Table 1

Transverse momentum PTIN w.r.t. the Thrust axis. For the first table Thrust axis definition is from seen charged particles corrected to final state particles. For the second table Thrust axis definition is from seen charged plus neutral particles corrected to final state charged plus neutral particles.

Table 2

Transverse momentum PTOUT w.r.t. the Thrust axis. For the first table Thrust axis definition is from seen charged particles corrected to final state particles. For the second table Thrust axis definition is from seen charged plus neutral particles corrected to final state charged plus neutral particles.

Table 3

Transverse momentum PTIN w.r.t. the Sphericity axis. For the first table Sphericity axis definition is from seen charged particles corrected to final state particles. For the second table Sphericity axis definition is from seen charged plus neutral particles corrected to final state charged plus neutral particles.