Kinematic distributions and nuclear effects of $J/ψ$ production in 920 GeV fixed-target proton-nucleus collisions
| dc.creator | B Collaboration | |
| dc.date | 2008-12-03 | |
| dc.date.accessioned | 2026-07-07T13:07:39Z | |
| dc.date.available | 2026-07-07T13:07:39Z | |
| dc.description | Measurements of the kinematic distributions of $J/ψ$ mesons produced in $p-$C, $p-$Ti and $p-$W collisions at $\sqrt{s}=41.6 \mathrm{GeV}$ in the Feynman-$x$ region $-0.34 < x_{F} < 0.14$ and for transverse momentum up to $p_T = 5.4 \mathrm{GeV}/c$ are presented. The $x_F$ and $p_T$ dependencies of the nuclear suppression parameter, $α$, are also given. The results are based on $2.4 \cdot 10^{5}$ $J/ψ$ mesons in both the $e^+ e^-$ and $μ^{+}μ^{-}$ decay channels. The data have been collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The measurement explores the negative region of $x_{F}$ for the first time. The average value of $α$ in the measured $x_{F}$ region is $0.981 \pm 0.015$. The data suggest that the strong nuclear suppression of $J/ψ$ production previously observed at high $x_F$ turns into an enhancement at negative $x_F$. | |
| dc.description | 19 pages, 11 figures, 6 tables | |
| dc.identifier | https://arxiv.org/abs/0812.0734 | |
| dc.identifier | http://arxiv.org/abs/0812.0734 | |
| dc.identifier | Eur.Phys.J.C60:525-542,2009 | |
| dc.identifier | doi:10.1140/epjc/s10052-009-0965-7 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/228162 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Kinematic distributions and nuclear effects of $J/ψ$ production in 920 GeV fixed-target proton-nucleus collisions | |
| dc.type | text |