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arXiv 2012.14995hep-phnucl-thquant-ph
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共振场的非相对论性有效场论

Nonrelativistic Effective Field Theory with a Resonance Field

J. B. Habashi, S. Fleming, U. van Kolck

摘要:

我们讨论了两个粒子的非相对论散射中的浅共振,使用有效场论(EFT),其中包括一个辅助场的量子数的共振。我们构造的显着重整化散射振幅的下一个到领先的系统展开的顺序。对于窄共振,振幅是微扰的,除了在共振极点附近。它在低能区域自然有一个零点,类似于拉姆绍尔-汤森效应。对于一个广泛的共振,领先的顺序振幅是非微扰几乎无处不在的EFT的有效性制度。我们恢复了无辅助场的EFT的结果,这等价于具有大散射长度和有效范围的有效范围扩展。我们还考虑了一个额外的微调导致一个低能量的振幅为零,即使是一个广泛的共振。我们表明,在所有情况下,重整化的要求时,辅助场是不是鬼确保共振极点在下半部分的复杂的动量平面,如预期的其他参数。EFT扩展的系统性特征是以玩具模型作为基础理论的例证。

英文摘要:

We discuss shallow resonances in the nonrelativistic scattering of two particles using an effective field theory (EFT) that includes an auxiliary field with the quantum numbers of the resonance. We construct the manifestly renormalized scattering amplitude up to next-to-leading order in a systematic expansion. For a narrow resonance, the amplitude is perturbative except in the immediate vicinity of the resonance poles. It naturally has a zero in the low-energy region, analogous to the Ramsauer-Townsend effect. For a broad resonance, the leading-order amplitude is nonperturbative almost everywhere in the regime of validity of the EFT. We regain the results of an EFT without the auxiliary field, which is equivalent to the effective-range expansion with large scattering length and effective range. We also consider an additional fine tuning leading to a low-energy amplitude zero even for a broad resonance. We show that in all cases the requirement of renormalizability when the auxiliary field is not a ghost ensures the resonance poles are in the lower half of the complex momentum plane, as expected by other arguments. The systematic character of the EFT expansion is exemplified with a toy model serving as underlying theory.

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