arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1303.3124nucl-th
收藏

手征有效场论中的质子-质子弱俘获

The proton-proton weak capture in chiral effective field theory

L. E. Marcucci, R. Schiavilla, M. Viviani

摘要:

本文用手征有效场论计算了质心相对能量0- 100 keV范围内质子-质子弱俘获的天体物理S因子。手征双核子势导出到下一个到领先的顺序增加了完整的电磁相互作用,包括,超越库仑,双光子和真空极化校正。进入弱电流算符的低能常数(LEC)是固定的,以便再现A=3的结合能和磁矩,以及氚β衰变中的Gamow-Teller矩阵元。保留了入射双质子通道中S和P分波的贡献。在零能量下,S因子为S(0)=(4.030 +/- 0.006)x 10^{-23} MeV fm^2,P波贡献为0.020 x 10^{-23} MeV fm^2。理论上的不确定性是由于LEC的拟合过程和截止依赖性。

英文摘要:

The astrophysical S-factor for proton-proton weak capture is calculated in chiral effective field theory over the center-of-mass relative-energy range 0--100 keV. The chiral two-nucleon potential derived up to next-to-next-to-next-to leading order is augmented by the full electromagnetic interaction including, beyond Coulomb, two-photon and vacuum-polarization corrections. The low-energy constants (LEC's) entering the weak current operators are fixed so as to reproduce the A=3 binding energies and magnetic moments, and the Gamow-Teller matrix element in tritium beta decay. Contributions from S and P partial waves in the incoming two-proton channel are retained. The S-factor at zero energy is found to be S(0)=(4.030 +/- 0.006) x 10^{-23} MeV fm^2, with a P-wave contribution of 0.020 x 10^{-23} MeV fm^2. The theoretical uncertainty is due to the fitting procedure of the LEC's and to the cutoff dependence.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑