English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We analyze the suppression of particle production at large transverse momentain ($0-5%$ most) central collisions of gold nuclei at $\sqrt{s_\textrm{NN}}=$200 GeV and lead nuclei at $\sqrt{s_{\textrm{NN}}}=$ 2.76 TeV. Fullnext-to-leading order radiative corrections at ${\cal{O}}(\alpha_s^3)$, andnuclear effects like shadowing and parton energy loss are included. The partonenergy loss is implemented in a simple multiple scattering model, where thepartons lose an energy $\epsilon=\lambda \times dE/dx$ per collision, where$\lambda$ is their mean free path. We take $\epsilon=\kappa E$ for a treatmentwhich is suggestive of the Bethe Heitler (BH) mechanism of incoherentscatterings, $\epsilon = \sqrt{\alpha E}$ for LPM mechanism, and $\epsilon=$constant for a mechanism which suggests that the rate of energy loss ($dE/dx$)of the partons is proportional to total path length ($L$) of the parton in theplasma, as the formation time of the radiated gluon becomes much larger than$L$.  We find that while the BH mechanism describes the nuclear modification factor$R_{\textrm{AA}}$ for $p_T \leq$ 5 GeV/$c$ (especially at RHIC energy), the LPMand more so the constant $dE/dx$ mechanism provides a good description atlarger $p_T$. This confirms the earlier expectation that the energy lossmechanism for partons changes from BH to LPM for $p_T \ge \lambda <k_T^2>$,where $\lambda \approx$ 1 fm and $<k_T^2> \approx$ 1 GeV$^2$ is the averagetransverse kick-squared received by the parton per collision. The energy lossper collision at the $\sqrt{s_\textrm{NN}}$ =2.76 TeV is found to be abouttwice of that at 0.2 TeV.

Evolution of mechanism of parton energy loss with transverse momentum at RHIC and LHC in relativistic collision of heavy nuclei