Cebra, Daniel
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J/psi production at high transverse momentum in p+p and Cu+Cu collisions at \sNN=200GeV

The STAR collaboration Abelev, B.I. ; Aggarwal, M.M. ; Ahammed, Z. ; et al.
Phys.Rev.C 80 (2009) 041902, 2009.
Inspire Record 817120 DOI 10.17182/hepdata.55733

The STAR collaboration at RHIC presents measurements of \Jpsi$\to{e^+e^-}$ at mid-rapidity and high transverse momentum ($p_T>5$ GeV/$c$) in \pp and central \cucu collisions at \sNN = 200 GeV. The inclusive \Jpsi production cross section for \cucu collisions is found to be consistent at high $p_T$ with the binary collision-scaled cross section for \pp collisions, in contrast to previous measurements at lower $p_T$, where a suppression of \Jpsi production is observed relative to the expectation from binary scaling. Azimuthal correlations of $J/\psi$ with charged hadrons in \pp collisions provide an estimate of the contribution of $B$-meson decays to \Jpsi production of $13% \pm 5%$.

8 data tables
Table 1

J/psi differential production cross section in sqrt(s).

Table 2

J/psi transverse momentum distribution in sqrt(s).

Table 3

J/psi transverse momentum distribution in sqrt(s).

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Exclusive rho^0 production in deep inelastic scattering at HERA

The ZEUS collaboration Chekanov, S. ; Derrick, M. ; Magill, S. ; et al.
PMC Phys.A 1 (2007) 6, 2007.
Inspire Record 757991 DOI 10.17182/hepdata.54963

Exclusive rho^0 electroproduction at HERA has been studied with the ZEUS detector using 120 pb^{-1} of integrated luminosity collected during 1996-2000. The analysis was carried out in the kinematic range of photon virtuality 2 < Q^2 < 160 GeV$^2, and gamma^* p centre-of-mass energy 32 < W < 180 GeV. The results include the Q^2 and W dependence of the gamma^* p --> rho^0 p cross section and the distribution of the squared-four-momentum transfer to the proton. The helicity analysis of the decay-matrix elements of the rho^0 was used to study the ratio of the gamma^* p cross section for longitudinal and transverse photon as a function of Q^2 and W. Finally, an effective Pomeron trajectory was extracted. The results are compared to various theoretical predictions.

30 data tables
Table 1

Measurement of the spin density matrix element r_04_00 as a function of Q**2.

Table 2

Measurement of the spin density matrix element RE(r_04_10) as a function of Q**2.

Table 3

Measurement of the spin density matrix element r_04_1-1 as a function of Q**2.

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Exclusive electroproduction of Phi mesons at HERA.

The ZEUS collaboration Chekanov, S. ; Derrick, M. ; Magill, S. ; et al.
Nucl.Phys.B 718 (2005) 3-31, 2005.
Inspire Record 679957 DOI 10.17182/hepdata.45894

Exclusive electroproduction of $\phi$ mesons has been studied in $e^\pm p$ collisions at $\sqrt{s}=318 \gev$ with the ZEUS detector at HERA using an integrated luminosity of 65.1 pb$^{-1}$. The $\gamma^*p$ cross section is presented in the kinematic range $2

23 data tables
Table 1

Exclusive GAMMA* P --> PHI P cross section in the Q**2 range 2 to 3 GeV**2.

Table 2

Exclusive GAMMA* P --> PHI P cross section in the Q**2 range 3 to 5 GeV**2.

Table 3

Exclusive GAMMA* P --> PHI P cross section in the Q**2 range 5 to 9 GeV**2.

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