Impact of nuclear dependence ofR=σL/σTon antishadowing in nuclear structure functions
| Autor: | Vadim Guzey, L. Y. Zhu, Cynthia Keppel, Alberto Accardi, D. Gaskell, M. Eric Christy, Patricia Solvignon |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Physical Review C. 86 |
| ISSN: | 1089-490X 0556-2813 |
| Popis: | We study the impact of the nuclear dependence of $R={\ensuremath{\sigma}}_{L}/{\ensuremath{\sigma}}_{T}$ on the extraction of the ${F}_{2}^{A}/{F}_{2}^{D}$ and ${F}_{1}^{A}/{F}_{1}^{D}$ structure function ratios from the data on the ${\ensuremath{\sigma}}^{A}/{\ensuremath{\sigma}}^{D}$ cross section ratios. Guided by indications of the nuclear dependence of $R$ from the world data, we examine selected sets of the European Muon Collaboration (EMC), Bologna-CERN-Dubna-Munich-Saclay (BCDMS), the New Muon Collaboration (NMC), and SLAC data and find that ${F}_{1}^{A}/{F}_{1}^{D}l{\ensuremath{\sigma}}^{A}/{\ensuremath{\sigma}}^{D}\ensuremath{\le}{F}_{2}^{A}/{F}_{2}^{D}$. In particular, we observe that the nuclear enhancement (antishadowing) for ${F}_{1}^{A}/{F}_{1}^{D}$ in the interval $0.1lxl0.3$ becomes significantly reduced or even disappears, which indicates that antishadowing is dominated by the longitudinal structure function ${F}_{L}$. We also argue that precise measurements of nuclear modifications of $R$ and ${F}_{L}^{A}$ have the potential to constrain the poorly known gluon distribution in nuclei over a wide range of $x$. |
| Databáze: | OpenAIRE |
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