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arXiv 0806.0242hep-ph
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QGP中快部分子的碰撞能量损失

Collisional Energy Loss of a Fast Parton in a QGP

Stephane Peigne

摘要:

与质子-质子碰撞相比,高能中心重离子碰撞中强子p_T谱的抑制,被称为“喷流猝灭”,目前认为是由于碰撞中产生的热介质中的部分子能量损失造成的。RHIC实验表明,在足够大的p_T下,强子淬灭是强的,并且对于轻味和重味,淬灭的量级相似。这一点在部分子能量损失的情况下很难理解,其中能量损失被认为主要是辐射性的,并且对于轻部分子和重夸克来说在数量上是不同的:重夸克的胶子辐射在小角度被抑制-在所谓的死锥内-重夸克遭受的辐射能量损失比轻部分子少。在这种情况下,重要的是重新考虑碰撞对部分子能量损失的贡献。虽然看起来很难理解碰撞损失如何在不同时增加轻强子淬灭的情况下显著增加重味淬灭,但在理论上建立重夸克碰撞能量损失的正确结果是重要的。

英文摘要:

The suppression of hadron p_T spectra in high energy central heavy-ion collisions compared to proton-proton collisions, referred to as 'jet-quenching', is currently attributed to partonic energy loss in the hot medium created in the collision. The RHIC experiments show that at large enough p_T, hadron quenching is strong, and of similar magnitude for light and heavy flavours. This point is difficult to understand in a parton energy loss scenario, where the energy loss is believed to be dominantly radiative, and quantitatively different for light partons and heavy quarks: gluon radiation off a heavy quark is suppressed at small angles - within the so-called dead cone - and a heavy quark suffers less radiative energy loss than a light parton. In this context it is important to reconsider the collisional contribution to partonic energy loss. Although it seems difficult to see how collisional losses could substantially increase heavy flavour quenching without simultaneously increasing light hadron quenching, it is theoretically important to establish correct results for the heavy quark collisional energy loss.

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