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Systematic study of azimuthal anisotropy in Cu + Cu and Au + Au collisions at $$sqrt{s_{NN}}$$ = 62.4 and 200 GeV

$$sqrt{s_{NN}}$$=62.4および200GeVでの銅-銅衝突および金-金衝突における方位角異方性のシステマティックな研究

Adare, A.*; 今井 憲一; 佐藤 進  ; 谷田 聖   ; PHENIX Collaboration*; 他420名*

Adare, A.*; Imai, Kenichi; Sato, Susumu; Tanida, Kiyoshi; PHENIX Collaboration*; 420 of others*

We have studied the dependence of azimuthal anisotropy $$v_2$$ for inclusive and identified charged hadrons in Au + Au and Cu + Cu collisions on collision energy, species, and centrality. The values of $$v_2$$ as a function of transverse momentum $$p_T$$ and centrality in Au+Au collisions at $$sqrt{s_{NN}}$$ = 200 and 62.4 GeV are the same within uncertainties. However, in Cu + Cu collisions we observe a decrease in $$v_2$$ values as the collision energy is reduced from 200 to 62.4 GeV. The decrease is larger in the more peripheral collisions. By examining both Au + Au and Cu + Cu collisions we find that $$v_2$$ depends both on eccentricity and the number of participants, $$N_{rm part}$$. We observe that $$v_2$$ divided by eccentricity ($$epsilon$$) monotonically increases with $$N_{rm part}$$ and scales as $$N_{rm part}^{1/3}$$. The Cu + Cu data at 62.4 GeV falls below the other scaled $$v_2$$ data. For identified hadrons, $$v_2$$ divided by the number of constituent quarks $$n_q$$ is independent of hadron species as a function of transverse kinetic energy $$KE_T=m_T-m$$ between $$0.1 < KE_T/n_q < 1$$ GeV. Combining all of the above scaling and normalizations, we observe a near-universal scaling, with the exception of the Cu + Cu data at 62.4 GeV, of $$v_2/(n_q cdot epsilon cdot N_{rm part}^{1/3})$$ vs $$KE_T/n_q$$ for all measured particles.

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パーセンタイル:78.31

分野:Physics, Nuclear

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