$K^{\ast}$(892)$^0$ resonance production with the ALICE experiment at the LHC

20 May 2014, 16:30
spectrum (darmstadtium)



Board: A-18
Poster QCD at High Temperature and/or Density Poster session


Kishora Nayak (National Institute of Science Education and Research (IN))


Short lived resonances are good probes to study the properties of strongly interacting matter produced in high energy heavy ion collisions. In particular, the resonance ${\rm K^{\ast 0}}$ is important because of its very short lifetime which is comparable to that of the fireball. The decay daughters are expected to undergo re-scattering and re-generation processes, which could modify the characteristic properties of ${\rm K^{\ast 0}}$ such as its mass, width and yield at low transverse momentum ($p_{\mathrm{T}}$). In addition, the yield of ${\rm K}^{\ast 0}$ at high ($p_{\mathrm{T}}$) may be suppressed in Pb-Pb relative to pp collisions due to the effect of the hot and dense medium formation. We report the measurement of the ${\rm K}^{\ast 0}$ resonance in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV and pp collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV via its hadronic decay channel $({\rm K}^{\ast 0}) (\overline{\rm K}^{\ast 0}) \rightarrow {\rm K}^{\pm}({\rm K}^{-}\pi^{+}) )$ with the ALICE detector. The centrality dependence of the mass, width, and yield of ${\rm K}^{\ast 0}$ in Pb-Pb collisions is compared to pp results to investigate the role of re-scattering and re-generation. The nuclear modification factor ($R_{\rm CP}$ and $R_{\rm AA}$) will be presented to study the effect of parton energy loss on ${\rm K}^{\ast 0}$ production and compared with other hadrons to understand the effect of baryon-meson separation.
On behalf of collaboration: ALICE

Primary author

Kishora Nayak (National Institute of Science Education and Research (IN))

Presentation Materials