We apply a quark combination model with equal-velocity combination (EVC) approximation to study the elliptic flow (\(v_{2}\)) of hadrons in heavy-ion collisions in a wide collision energy range (\(\sqrt{s_{NN}}=\) 27–5020 GeV). Utilizing the simple relationship between \(v_{2}\) of hadrons and those of quarks under EVC, we find that \(v_{2}\) of up/down quarks obtained by experimental data of proton is consistent with that obtained by data of \(\varLambda \) and \(\varXi \). \(v_{2}\) of strange quarks obtained by data of \(\varOmega \) is consistent with that obtained by data of \(\varLambda \) and \(\varXi \), and at RHIC energies it is also consistent with that obtained by data of \(\phi \). This means that \(v_{2}\) of these hadrons have a common quark-level source. Using data of \(D^0\), we obtain \(v_{2}\) of charm quarks with \(p_T\lesssim 6\) GeV/c. We find that under EVC charm quark dominates \(v_{2}\) of D mesons at low \(p_{T}\) but light-flavor quarks significantly contribute to \(v_{2}\) of D mesons in the range \(3\lesssim p_{T}\lesssim 8\) GeV/c. We predict \(v_{2}\) of charmed baryons \(\varLambda _{c}^{+}\) and \(\varXi _{c}^{0}\) which show a significant enhancement at intermediate \(p_{T}\) due to the double contribution of light-flavor quarks. The properties of the obtained quark \(v_{2}\) under EVC are studied and a regularity for \(v_{2}\) of quarks as the function of \(p_{T}/m\) is found.

我们采用等速组合（EVC）近似的夸克组合模型来研究重离子碰撞中强子在宽碰撞能量范围（\（\ sqrt {s_）中的椭圆流（\（v_ {2} \））{NN}} = \） 27-5020 GeV）。利用强子的\（v_ {2} \）与EVC下的夸克的简单关系，我们发现质子实验数据获得的上下夸克的\（v_ {2} \）与通过质子实验获得的夸克\（v_ {2} \）一致。的数据\（\ varLambda \）和\（\ varXi \） 。\（V_ {2} \）通过的数据而获得的奇异夸克的\（\ varOmega \）是与由数据获得一致\（\ varLambda \）和\（\ varXi \），并且在RHIC能量下，它也与\（\ phi \）数据获得的一致。这意味着这些强子中的\（v_ {2} \）具有共同的夸克级来源。使用\（D ^ 0 \）的数据，我们得到\（p_T \ lesssim 6 \） GeV / c的魅力夸克\（v_ {2} \）。我们发现，在EVC下，夸克在低\（p_ {T } \）的D介子的\（v_ {2} \）中占主导地位，而浅味夸克对D介子的\（v_ {2} \）的D介子的贡献显着。范围\（3 \ lesssim p_ {T} \ lesssim 8 \） GeV / c。我们预测有魅力的重子\（v_ {2} \）\（\ varLambda _ {c} ^ {+} \）和\（\ varXi _ {c} ^ {0} \）在中间\（p_ {T} \）处显示出显着增强，这是由于（淡味夸克。所获得的夸克的性质\（V_ {2} \） EVC下进行了研究和用于规律性\（V_ {2} \）夸克作为的函数的\（P_【T} /米\）中找到。