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Spectra of identified high-$p_{T}$ $\pi^\pm$ and $p(\bar{p})$ in Cu$+$Cu collisions at $\sqrt{s_{NN}}=200$ GeV

The collaboration
Phys.Rev.C 81 (2010) 054907, 2010.

Abstract (data abstract)
We report new results on identified (anti)proton and charged pion spectra at large transverse momenta (3<$p_{T}$<10 GeV/c) from Cu+Cu collisions at $\sqrt{s_{NN}}$=200 GeV using the STAR detector at the Relativistic Heavy Ion Collider (RHIC). This study explores the system size dependence of two novel features observed at RHIC with heavy ions: the hadron suppression at high-$p_{T}$ and the anomalous baryon to meson enhancement at intermediate transverse momenta. Both phenomena could be attributed to the creation of a new form of QCD matter. The results presented here bridge the system size gap between the available pp and Au+Au data, and allow the detailed exploration for the on-set of the novel features. Comparative analysis of all available 200 GeV data indicates that the system size is a major factor determining both the magnitude of the hadron spectra suppression at large transverse momenta and the relative baryon to meson enhancement.

• #### Figure 1 (a)

Data from Figure 1 (a)

10.17182/hepdata.98965.v1/t1

Transverse momentum spectra of pions (a) and protons (b) produced in Cu+Cu collisions at $\sqrt{s_{NN}}$=200 GeV. Data are presented for...

• #### Figure 1 (b)

Data from Figure 1 (b)

10.17182/hepdata.98965.v1/t2

Transverse momentum spectra of pions (a) and protons (b) produced in Cu+Cu collisions at $\sqrt{s_{NN}}$=200 GeV. Data are presented for...

• #### Figure 2 (a)

Data from Figure 2 (a)

10.17182/hepdata.98965.v1/t3

Anti-particle to particle ratios, as a function of transverse momentum for pions (a) and protons (b). Data for the four...

• #### Figure 2 (b)

Data from Figure 2 (b)

10.17182/hepdata.98965.v1/t4

Anti-particle to particle ratios, as a function of transverse momentum for pions (a) and protons (b). Data for the four...

• #### Figure 3 (a)

Data from Figure 3 (a)

10.17182/hepdata.98965.v1/t5

(Color online) (a) Nuclear modification factor, RAA, for charged pions ($\pi^{+}+\pi^{−}$) in Cu+Cu (filled symbols) and Au+Au (open symbols) collisions...

• #### Figure 3 (b)

Data from Figure 3 (b)

10.17182/hepdata.98965.v1/t6

(Color online) (b) Integrated pion $R_{AA}$ over the range $5<p_{T}<8$ GeV/c versus $N_{part}$. The bands represent the systematic uncertainty on...

• #### Figure 4 (a)

Data from Figure 4 (a)

10.17182/hepdata.98965.v1/t7

(Color online) (a) Nuclear modification factor, RAA, for protons and anti-protons ($p + \overline{p}$) in Cu+Cu (filled symbols) and Au+Au...

• #### Figure 5 (a)

Data from Figure 5 (a)

10.17182/hepdata.98965.v1/t8

(Color online) (a) Ratio of protons and anti-protons to charged pions, versus transverse momentum, for Cu+Cu collisions at $\sqrt{s_{NN}}$=200 GeV....

• #### Figure 5 (b)

Data from Figure 5 (b)

10.17182/hepdata.98965.v1/t9

(Color online) (b) Average $(p+\overline{p})/(\pi^{+}+\pi^{-})$ ratio for $3<p_{T}<4$ GeV/c is shown as function of centrality ($N_{part}$) for Cu+Cu and Au+Au...