论文标题
在$ \ sqrt {s_ {nn}} $ = 200 GEV中的AU+AU碰撞中的包含带电粒子喷气机的测量
Measurement of inclusive charged-particle jet production in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV
论文作者
论文摘要
相对论重离子撞机的星级合作报告了$ \ sqrt {s_ {nn}} $ = 200 GEV的外围和中央Au+Au碰撞中的包容性喷气生产的首次测量。使用带有伪the的带电曲目$ | |η| <1.0 $和横向动量$ 0.2 <p_ {观察到与射流信号不相关的较大背景屈服是由统计相空间主导的,这与先前的巧合测量一致。要求在接受的Jet候选者中使用高透明摩托车(高$ p_t $)的高晶型摩托车(高$ p_t $)来抑制这种背景。评估了此要求所施加的偏见,并确定了偏见很小的$ P_T $区域。 $ 5 <p_ {t,jet}^{ch} <25 $ gev/$ c $和$ 5 <p_ {t,jet}^{ch} <30 $ gev/$ c $,在外围和中央Au+au碰撞中报告了包容性带电的喷气式喷气发行。与使用Pythia事件生成器计算得出的$ PP $产量相比,与中央AU+AU碰撞相比,中央AU+AU的碰撞均受到抑制。抑制的幅度与高$ p_t $的包含强子产生的幅度是一致的,而当通过中等诱导的能量传输引起的能量损失表示时,抑制的抑制幅度与半熟悉的后坐力射流产量相一致。 $ r $不同值的包含带电粒子喷气收益率的比较表明,在中央AU+AU碰撞中以$ r <0.4 $的横向喷射剖面的扩展没有明显的证据。测得的分布与结合喷射淬火的理论模型计算一致。
The STAR Collaboration at the Relativistic Heavy Ion Collider reports the first measurement of inclusive jet production in peripheral and central Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV. Jets are reconstructed with the anti-k$_{T}$ algorithm using charged tracks with pseudorapidity $|η|<1.0$ and transverse momentum $0.2<p_{T,jet}^{ch}<30$ GeV/$c$, with jet resolution parameter $R$=0.2, 0.3, and 0.4. The large background yield uncorrelated with the jet signal is observed to be dominated by statistical phase space, consistent with a previous coincidence measurement. This background is suppressed by requiring a high-transverse-momentum (high-$p_T$) leading hadron in accepted jet candidates. The bias imposed by this requirement is assessed, and the $p_T$ region in which the bias is small is identified. Inclusive charged-particle jet distributions are reported in peripheral and central Au+Au collisions for $5<p_{T,jet}^{ch}<25$ GeV/$c$ and $5<p_{T,jet}^{ch}<30$ GeV/$c$, respectively. The charged-particle jet inclusive yield is suppressed for central Au+Au collisions, compared to both the peripheral Au+Au yield from this measurement and to the $pp$ yield calculated using the PYTHIA event generator. The magnitude of the suppression is consistent with that of inclusive hadron production at high $p_T$, and that of semi-inclusive recoil jet yield when expressed in terms of energy loss due to medium-induced energy transport. Comparison of inclusive charged-particle jet yields for different values of $R$ exhibits no significant evidence for medium-induced broadening of the transverse jet profile for $R<0.4$ in central Au+Au collisions. The measured distributions are consistent with theoretical model calculations that incorporate jet quenching.