$\mathrm{K}^{*}(\mathrm{892})^{0}$ and $\mathrm{φ(1020)}$ production in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 8.16 TeV

The production of $\mathrm{K}^{*}(\mathrm{892})^{0}$ and $\mathrm{\phi(1020)}$ resonances has been measured in p-Pb collisions at $\sqrt{s_{\rm NN}}$ = 8.16 TeV using the ALICE detector. Resonances are reconstructed via their hadronic decay channels in the rapidity interval $-$0.5 $<~$ $y$ $<~$ 0 and the transverse momentum spectra are measured for various multiplicity classes up to $p_{\rm T}$ = 20 GeV/$c$ for $\mathrm{K}^{*}(\mathrm{892})^{0}$ and $p_{\rm T}$ = 16 GeV/$c$ for $\mathrm{\phi(1020)}$. The $p_{\rm T}$ -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 $\mathrm{K}^{*}(\mathrm{892})^{0}$ and $\mathrm{\phi(1020)}$ resonance production is newly tested in p-Pb collisions and found to hold in the high-$p_{\rm T}$ region at LHC energies. The nuclear modification factors ($R_{\rm pPb}$) as a function of $p_{\rm T}$ for $\mathrm{K}^{*0}$ and $\mathrm{\phi}$ at $\sqrt{s_{NN}}$ = 8.16 TeV are presented along with the new $R_{\rm pPb}$ measurements of $\mathrm{K}^{*0}$, $\mathrm{\phi}$ , $\Xi$, and $\Omega$ at $\sqrt{s_{\rm NN}}$ = 5.02 TeV. At intermediate $p_{\rm T}$ (2-8 GeV/$c$), $R_{\rm pPb}$ of $\Xi$, $\Omega$ show a Cronin-like enhancement, while $\mathrm{K}^{*0}$ and $\mathrm{\phi}$ show no or little nuclear modification. At high $p_{\rm T}$ ($>$ 8 GeV/$c$), the $R_{\rm pPb}$ values of all hadrons are consistent with unity within uncertainties. The $R_{\rm pPb}$ of $\mathrm{K}^{*}(\mathrm{892})^{0}$ and $\mathrm{\phi(1020)}$ at $\sqrt{s_{\rm NN}}$ = 8.16 and 5.02 TeV show no significant energy dependence.

 

Submitted to: PRC
e-Print: arXiv:2110.10042 | PDF | inSPIRE

Figure 1

Invariant mass distributions for \kstar and \phim in the multiplicity class 0--100$\%$ and transverse momentum range 1.4 $\leq$ \pt $

Figure 2

Top panels: Transverse momentum spectrum of \kstar (left) and \phim (right) as a function of \pt for the NSD events, measured in the rapidity interval $-$0.5 $

Figure 3

Top panels: Energy dependence comparison of the transverse momentum spectra of \kstar (left) and \phim (right) as a function of\pt for the NSD events, measured in the rapidity interval $-$0.5 $

Figure 4

Top panels: The transverse momentum spectra of \kstar (left) and \phim (right) for various multiplicity classes, measured in the rapidity interval $-0.5

Figure 5

The multiplicity-scaled integrated yield (\dNdyy/$\langle\mathrm{d}N_{\mathrm{ch}}/\mathrm{d}\eta\rangle_{|\eta|

Figure 7

Scaled invariant yield of \kstar and \phim as a function of $x_{\rm{T}}$ = 2$p_{\mathrm{T}}/\snn$ in p--Pb collisions at different energies \snn = 5.02 and 8.16 TeV.

Figure 8

Nuclear modification factor of \kstar and \phim as a function of \pt in p--Pb collisions at different energies \snn = 5.02 and 8.16 TeV. The statistical and systematic uncertainties are represented by vertical bars and boxes, respectively. The normalization uncertainties are shown in each panel as boxes around \RpPb $=$ 1 near \pt $=$ 0 \GeVc.

Figure 9

The nuclear modification factor \RpPb as a function of transverse momentum \pt for different particle species in \pPb collisions at \snn = 5.02 and 8.16 TeV. For comparison the results for $\pi$, K, and p~ are also shown. The statistical and systematic uncertainties are represented by vertical bars and boxes, respectively. The normalization uncertainties are shown in each panel as boxes around \RpPb $=$ 1 near \pt $=$ 0 \GeVc.