First simultaneous global QCD analysis of dihadron fragmentation functions and transversity parton distribution functions

First simultaneous global QCD analysis of dihadron fragmentation functions and transversity parton distribution functions
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首次同时对双强子碎裂函数和横向部分子分布函数进行全局 QCD 分析

DOI:
10.1103/physrevd.109.034024
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发表时间:
2024
期刊:
影响因子:
5
通讯作者:
Seidl, R.
Seidl, R.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cocuzza, C.;Metz, A.;Pitonyak, D.;Prokudin, A.;Sato, N.;Seidl, R.

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我们在量子色动力学(QCD)范围内对电子-正电子湮灭、半包容性深非弹性散射和质子-质子碰撞中的双强子观测量进行了全面的研究,包括最近来自贝儿的截面数据和来自星星的方位角不对称性。我们同时提取了第一时间强子碎裂函数(DiFFs)和上、下夸克以及反夸克的核子横观分布。对于横向分布,我们施加他们的小渐近行为和Soffer界。此外,我们利用一个新的定义的DiFFs,有一个数密度的解释,然后计算期望值的双强子不变的质量和动量分数。此外,我们调查的兼容性,我们的横向结果与单强子碎裂(从横向动量依赖/共线扭曲-3框架)和核子张量电荷计算格点QCD。我们发现所有这些可用信息都具有普遍性。未来对双强子产生的测量可以显着地推进这一研究,特别是,正如我们所展示的,那些对大部分子动量分数区域敏感的测量。
We perform a comprehensive study within quantum chromodynamics (QCD) of dihadron observables in electron-positron annihilation, semi-inclusive deep-inelastic scattering, and proton-proton collisions, including recent cross section data from Belle and azimuthal asymmetries from STAR. We extract simultaneously for the first timedihadron fragmentation functions (DiFFs) and the nucleon transversity distributions for up and down quarks as well as antiquarks. For the transversity distributions we impose their small-asymptotic behavior and the Soffer bound. In addition, we utilize a new definition of DiFFs that has a number density interpretation to then calculate expectation values for the dihadron invariant mass and momentum fraction. Furthermore, we investigate the compatibility of our transversity results with those from single-hadron fragmentation (from a transverse momentum dependent/collinear twist-3 framework) and the nucleon tensor charges computed in lattice QCD. We find a universal nature to all of this available information. Future measurements of dihadron production can significantly further this research, especially, as we show, those that are sensitive to the region of large parton momentum fractions.
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