CGC/saturation approach: re-visiting the problem of odd harmonics in angular correlations |
| |
Authors: | E Gotsman E Levin |
| |
Institution: | 1.Department of Particle Physics, School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Science,Tel Aviv University,Tel Aviv,Israel;2.Departemento de Física, Centro Científico- Tecnológico de Valparaíso,Universidad Técnica Federico Santa María,Valparaíso,Chile |
| |
Abstract: | In this paper we demonstrate that the selection of events with different multiplicities of produced particles, leads to the violation of the azimuthal angular symmetry, \(\phi \rightarrow \pi - \phi \). We find for LHC and lower energies, that this violation can be so large for the events with multiplicities \(n \ge 2 \bar{n}\), where \(\bar{n}\) is the mean multiplicity, that it leads to almost no suppression of \(v_n\), with odd n. However, this can only occur if the typical size of the dipole in DIS with a nuclear target is small, or \(Q^2 \,>\,Q^2_s\left( A; Y_{\mathrm{min}},b\right) \), where \(Q_s\) is the saturation momentum of the nucleus at \(Y = Y_{\mathrm{min}}\). In the case of large sizes of dipoles, when \(Q^2 \,<\,Q^2_s\left( A; Y_{\mathrm{min}},b\right) \), we show that \(v_n =0\) for odd n. Hadron-nucleus scattering is discussed. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|