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arXiv 0907.0025hep-ph
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高能碰撞中粲偶素产生的粲对再散射机制

Charm-pair Rescattering Mechanism for Charmonium Production in High-energy Collisions

Pierre Artoisenet, Eric Braaten

摘要:

2005年,兰斯伯格、库戴尔和卡利诺夫斯基提出了一种在高能碰撞中产生重夸克偶素的新机制,称为“s通道切割”。我们确定这种机制物理上作为一个重夸克和反夸克的生产是在壳层,然后再散射产生重夸克偶素。我们指出,在NRQCD因式分解形式主义,这种再散射机制是一个贡献的色单重态模型项在下一个到下一个到领先的微扰理论。它对生产率的主要贡献可以在不引入任何额外的唯象参数的情况下计算出来。我们计算的魅力对再散射(或S-通道切割)的生产J/psi在Tevatron的贡献,并比较它的估计Lansberg等人。使用唯象模型。这种贡献的竞争与领先的顺序项在颜色单重态模型在大的横向动量,但显着小于下一个领先的顺序项。我们的结论是,在高能碰撞中的粲偶素生产的魅力对再散射是不是一个占主导地位的机制。

英文摘要:

A new mechanism for heavy quarkonium production in high-energy collisions called the "s-channel cut" was proposed in 2005 by Lansberg, Cudell, and Kalinovsky. We identify this mechanism physically as the production of a heavy quark and anti-quark that are on-shell followed by their rescattering to produce heavy quarkonium. We point out that in the NRQCD factorization formalism this rescattering mechanism is a contribution to the color-singlet model term at next-to-next-to-leading order in perturbation theory. Its leading contribution to the production rate can be calculated without introducing any additional phenomenological parameters. We calculate the charm-pair rescattering (or s-channel cut) contribution to the production of J/psi at the Tevatron and compare it to estimates by Lansberg et al. using phenomenological models. This contribution competes with the leading-order term in the color-singlet model at large transverse momentum but is significantly smaller than the next-to-leading-order term. We conclude that charm-pair rescattering is not a dominant mechanism for charmonium production in high-energy collisions.

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