K*(892)0 and ϕ(1020) production in p−Pb collisions at sNN=8.16 TeV

Résumé fourni par la source

The production of ${\mathrm{K}}^{*}{(892)}^{0}\phantom{\rule{3.33333pt}{0ex}}$and $\ensuremath{\phi}(1020)\phantom{\rule{3.33333pt}{0ex}}$resonances has been measured in $p$-Pb collisions at $\sqrt{{s}_{NN}}$ = 8.16 TeV using the ALICE detector. Resonances are reconstructed via their hadronic decay channels in the rapidity interval $\ensuremath{-}$0.5 $<$ $y$ $<$ 0 and the transverse momentum spectra are measured for various multiplicity classes up to ${p}_{\mathrm{T}}$ = 20 $\mathrm{GeV}/\mathrm{c}$ for ${\mathrm{K}}^{*}{(892)}^{0}\phantom{\rule{3.33333pt}{0ex}}$and ${p}_{\mathrm{T}}$ = 16 $\mathrm{GeV}/\mathrm{c}$ for $\ensuremath{\phi}(1020)$. The ${p}_{\mathrm{T}}$-integrated yields and mean transverse momenta are reported and compared with previous results in pp, $p$-Pb and Pb-Pb collisions. The ${x}_{\mathrm{T}}$ scaling for ${\mathrm{K}}^{*}{(892)}^{0}\phantom{\rule{3.33333pt}{0ex}}$and $\ensuremath{\phi}(1020)\phantom{\rule{3.33333pt}{0ex}}$resonance production is newly tested in $p$-Pb collisions and found to hold in the high-${p}_{\mathrm{T}}$ region at Large Hadron Collider energies. The nuclear modification factors (${R}_{\mathit{p}\mathrm{Pb}}$) as a function of ${p}_{\mathrm{T}}$ for ${\mathrm{K}}^{*0}$ and $\ensuremath{\phi}$ at $\sqrt{{s}_{NN}}$ = 8.16 TeV are presented along with the new ${R}_{\mathit{p}\mathrm{Pb}}$ measurements of ${\mathrm{K}}^{*0}$, $\ensuremath{\phi}$, $\mathrm{\ensuremath{\Xi}}$, and $\mathrm{\ensuremath{\Omega}}$ at $\sqrt{{s}_{NN}}$ = 5.02 TeV. At intermediate ${p}_{\mathrm{T}}$ (2--8 $\mathrm{GeV}/\mathrm{c}$), ${R}_{\mathit{p}\mathrm{Pb}}$ of $\mathrm{\ensuremath{\Xi}}$, $\mathrm{\ensuremath{\Omega}}$ show a Cronin-like enhancement, while ${\mathrm{K}}^{*0}$ and $\ensuremath{\phi}$ show no or little nuclear modification. At high ${p}_{\mathrm{T}}$ ($>$8 $\mathrm{GeV}/\mathrm{c}$), the ${R}_{\mathit{p}\mathrm{Pb}}$ values of all hadrons are consistent with unity within uncertainties. The ${R}_{\mathit{p}\mathrm{Pb}}$ of ${\mathrm{K}}^{*}{(892)}^{0}\phantom{\rule{3.33333pt}{0ex}}$and $\ensuremath{\phi}(1020)\phantom{\rule{3.33333pt}{0ex}}$at $\sqrt{{s}_{NN}}$ = 8.16 and 5.02 TeV show no significant energy dependence.

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