We employ an effective field theory (EFT) that exploits the separation of scales in the p-wave halo nucleus $^8\mathrm{B}$ to describe the process $^7\mathrm{Be}(p,γ)^8\mathrm{B}$ up to a center-of-mass energy of 500 keV. The calculation, for which we develop the lagrangian and power counting, is carried out up to next-to-leading order (NLO) in the EFT expansion. The power counting we adopt implies that Coulomb interactions must be included to all orders in $α_{\rm em}$. We do this via EFT Feynman diagrams computed in time-ordered perturbation theory, and so recover existing quantum-mechanical technology such as the two-potential formalism for the treatment of the Coulomb-nuclear interference. Meanwhile the strong interactions and the E1 operator are dealt with via EFT expansions in powers of momenta, with a breakdown scale set by the size of the ${}^7$Be core, $Λ\approx 70$ MeV. Up to NLO the relevant physics in the different channels that enter the radiative capture reaction is encoded in ten different EFT couplings. The result is a model-independent parametrization for the reaction amplitude in the energy regime of interest. To show the connection to previous results we fix the EFT couplings using results from a number of potential model and microscopic calculations in the literature. Each of these models corresponds to a particular point in the space of EFTs. The EFT structure therefore provides a very general way to quantify the model uncertainty in calculations of $^7\mathrm{Be}(p,γ)^8\mathrm{B}$. We also demonstrate that the only N$^2$LO corrections in $^7\mathrm{Be}(p,γ)^8\mathrm{B}$ come from an inelasticity that is practically of N$^3$LO size in the energy range of interest, and so the truncation error in our calculation is effectively N$^3$LO. We also discuss the relation of our extrapolated $S(0)$ to the previous standard evaluation.
Low-Energy Lepton-Proton Bremsstrahlung via Effective Field Theory
本文在次领先级手征微扰理论中，系统地计算了轻子-质子韧致辐射过程l + p -> l' + p + γ的截面。该过程对应于在PSI处提议的MUSE实验的未检测到的背景信号。MUSE被设计用于测量低能电子和μ子从质子目标的弹性散射，以提取质子的r.m.s.的精确值。半径我们表明，常用的峰值近似，这是用来评估的弹性截面的辐射尾，是不适用于μ子质子散射在低能量MUSE运动学。此外，我们指出了一定的病理与标准的手征功率计数计划与电子散射，从而下一个到下一个到领先的顺序贡献的π介子回路图是运动学增强和数值上的下一个到领先的顺序校正相同的幅度。我们更正了一篇常被引用的评论文章中的一个印刷错误。
Single inclusive particle production at next-to-leading order in proton-nucleus collisions at forward rapidities: hybrid approach meets TMD factorization
The Solar Proton Burning Process Revisited In Chiral Perturbation Theory
质子燃烧过程p + p -> d + e（+）+v（e）对于质量等于或小于太阳的主序星的恒星演化是重要的，本文用有效场论在手征微扰展开到次-次-主导手征阶进行计算。这代表了一个模型无关的计算符合低能量有效理论的QCD可比的准确性辐射NP捕获以前计算的热能首先使用非常准确的两个核子波函数支持的有效场论技术与有限截止。由此得到的结果被发现在理论不确定性内支持Bahcall和他的同事以前对相同过程的计算。
First simultaneous analysis of transverse momentum dependent and collinear parton distributions in the proton
Jefferson Lab（杰斐逊实验室）；Argonne National Laboratory（阿贡国家实验室）；Penn State University Berks（宾夕法尼亚州立大学伯克斯分校）；William & Mary（威廉与玛丽学院）；Lebanon Valley College（黎巴嫩谷学院）；Universidad Complutense de Madrid（马德里康普顿斯大学）
