A. Courtoy
We present a study of the valence transversity PDF obtained through a constrained fit. The effects of the constraints on the uncertainties of the PDF are explored. We show that the resulting isovector tensor charge is largely undetermined and, hence, compatible with all lattice evaluations.
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We present a point-by-point determination of the valence transversity distributions from two different types of processes: single-hadron production and dihadron production, both in semi-inclusive deep inelastic scattering and e+e- annihilation. The extraction is based on some simple assumptions and does not require any parametrization. The transversity distributions obtained from Collins effect in single-hadron production and from interference effects in dihadron production are found to be compatible with each other.
Transversity and dihadron fragmentation functions
夸克横度分布的观测需要另一个对夸克横自旋敏感的软物体。双强子碎裂函数是分析部分子自旋的一个方便的工具，它可以影响两个强子的角分布。特别是，所谓的干涉碎裂函数可以用来探测半包容的深度非弹性散射以及质子-质子碰撞中的横向性。在这两个过程中，我们讨论了在α_S中的首旋和首阶处对横向性敏感的两个单自旋不对称性。
The Dihadron fragmentation functions way to Transversity
基于对横向极化目标深度非弹性散射中π介子对产生的分析，给出了横向部分子分布的观测结果。这种提取依赖于从电子正电子湮没测量中获得的双强子碎裂函数的知识。这是首次尝试在共线分解的框架下确定的横向分布。
We present a constrained analysis of the valence transversity Parton Distribution Functions from dihadron production in semi-inclusive DIS. While usual extractions of the transversity distributions rely explicitly on the fulfilment of the Soffer bounds, the present analysis releases that implicit restriction to implement further explicit constraints through the Lagrange multipliers method. The results are quantitatively comparable to previous analyses in the kinematical range of data ; the qualitative impact of the chosen fitting strategy translates into an increased flexibility in the functio…
Status on the transversity parton distribution: the dihadron fragmentation functions way
我们报告的提取双强子碎裂函数（DiFF）的两个强子对在背靠背喷流的e+e-湮灭的半包容性生产。相反的$π^+π^-$对的方位角取向的相关性中的非零不对称性与通过显著极化的DiFF的碎裂夸克的横向极化有关。这种不对称性和自旋不对称性的SIDIS过程$ep^{\uparrow}\to e'(π^+π^-)X$的综合分析，导致了第一次提取的u和d味横向部分子分布函数的框架内的共线因式分解。
First glances at the transversity parton distribution through dihadron fragmentation functions
我们提出了第一次观察的横向部分子分布的基础上的分析的π介子对生产的深度非弹性散射关闭横向极化目标。横向性的提取依赖于我们从电子正电子湮没测量中获得的双强子碎裂函数的知识。这是首次尝试在共线分解的框架下确定的横向分布。
Transversity distributions and tensor charges of the nucleon: extraction from dihadron production and their universal nature
本文通过对双强子产生数据的首次全局QCD分析，同时提取核子横度分布与π⁺π⁻碎裂函数，并纳入理论约束和格点QCD张量电荷，证明了相关信息的普适性。
First simultaneous global QCD analysis of dihadron fragmentation functions and transversity parton distribution functions
本文首次在全局QCD分析中同时提取π⁺π⁻双强子碎裂函数与核子横移分布，并验证其与单强子碎裂及格点QCD张量电荷的一致性。
We have updated our extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets in collinear factorization. The most recent COMPASS data for proton and deuteron targets, complemented by previous HERMES data on the proton, make it possible to perform a flavor separation of the valence components of the transversity distribution, using di-hadron fragmentation functions taken from the semi-inclusive production of two pion pairs in back-to-back jets in $e^+ e^-$ annihilation. The $e^+ e^-$ data fro…
We present an updated extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets in collinear factorization. Data for proton and deuteron targets make it possible to perform a flavor separation of the valence components of the transversity distribution, using di-hadron fragmentation functions taken from the semi-inclusive production of two pion pairs in back-to-back jets in e+e- annihilation. The e+e- data from Belle have been reanalyzed using the replica method and a more realistic estimate o…
Impact of Future Dihadron Production Measurements on the Transversity Distributions and Tensor Charges of the Nucleon
通过生成CLAS12、SoLID和ePIC实验的赝数据并纳入JAMDiFF全局分析，评估未来双强子产生测量对横向性部分子分布函数和核子张量电荷不确定性的约束能力。
We summarize recent results obtained thanks to the phenomenology of Dihadron Fragmentation Functions. The results include the update on the fitting techniques for both the Dihadron Fragmentation Functions themselves and the transversity PDF. The determination of the tensor charge of the nucleons as well as the impact of the latter on search for physics beyond the standard model are also discussed. So is the future extraction of the subleading-twist PDF $e(x)$ from JLab soon-to-be-released Beam Spin Asymmetry data.
We present preliminary results for an updated extraction of the transversity parton distribution based on the analysis of pion-pair production in deep-inelastic scattering off transversely polarized targets in collinear factorization. Data for proton and deuteron targets by HERMES and COMPASS allow for a flavor separation of the valence components of transversity, while di-hadron fragmentation functions are taken from the semi-inclusive production of two pion pairs in back-to-back jets in $e^+ e^-$ annihilation. The latter data from Belle have been reanalyzed using the replica method and a mor…
We report on the phenomenological results obtained through Dihadron Fragmentation Functions related processes. In 2015, an update on the fitting techniques for the Dihadron Fragmentation Functions has led to an improved extraction of the transversity PDF and, as a consequence, the nucleon tensor charge. We discuss the impact of the determination of the latter on search for physics Beyond the Standard Model, focusing on the error treatment. We also comment on the future of the extraction of the subleading-twist PDF $e(x)$ from JLab soon-to-be-released Beam Spin Asymmetry data.
The Effect of Vector Meson Decays on Dihadron Fragmentation Functions
双强子碎裂函数（DFF）提供了大量关于部分子强子化过程复杂细节的信息。此外，他们提供了一个独特的访问，“干净”提取的核子横向部分子分布函数在半包容的深度非弹性两个强子生产过程与横向极化的目标。以u \to π^+ π^-为例，我们利用概率解释分析了非极化DFF的性质。我们利用NJL喷流强子化模型和PYTHIA 8.1事件发生器研究了夸克强子化过程中产生的矢量介子的强衰变对赝标DFF的影响。我们的研究表明，尽管在强子化过程中产生矢量介子的可能性比相同电荷的赝标量介子小，但由于组合因子较大，它们的强衰变产物对π介子的DFF有很大的影响.因此，矢量介子的产生和衰变的准确描述是至关重要的理论理解的DFFs。
Simplified approach to extracting nucleon transversity in collinear factorization using near-side energy-energy correlators
本文提出利用近侧能量-能量关联量在共线因子化框架中提取核子横极化分布函数的新方法，简化了传统方法中对部分子横向动量或共振的建模复杂度，并展示了其在半包容深非弹性散射和电子-正电子湮灭中的高阶解析结果。
Transverse-spin dependent energy-energy correlators in proton-proton collisions within the dihadron fragmentation framework
基于双强子碎裂和横向性部分子分布函数的全局QCD分析模型，计算了横向极化质子-质子碰撞中喷注内两个强子产生的能量-能量关联，数值预测与STAR测量吻合，并表明大横向动量数据倾向于支持与格点QCD核子张量电荷一致的横向性提取。
First extraction of valence transversities in a collinear framework
基于对横向极化靶深度非弹性散射中π介子对产生的分析，提出了一种价横向部分子分布的提取方法。最近公布的数据，质子和氘核的目标，在HERMES和COMPASS允许的味道分离的价translation。本提取是在共线因子分解的框架下进行的，其中涉及到双强子碎裂函数。后者取自先前对电子正电子湮没测量的分析。
$q \to Λ$ Fragmentation Function and Nucleon Transversity Distribution in a Diquark Model
基于一个简单的夸克-双夸克模型，通过拟合$e^+ e ^- $湮灭过程中的非极化$Λ$产生数据，提出了一组非极化、纵向极化和横向极化的$Λ$碎裂函数.结果发现，螺旋度结构的$Λ$碎裂功能的支持所有可用的实验数据的纵向$Λ$极化。在双夸克模型的同一框架内，核子的横向分布和一致的描述的方位角自旋不对称性的π电产生的HERMES数据。此外，还预测了横向极化核子靶上带电轻子DIS中横向极化$Λ$的自旋转移。
Global analysis of Sivers and Collins asymmetries within the TMD factorization
本文在TMD因子化框架下全局分析Sivers函数、横向极化分布和Collins碎裂函数，纳入COMPASS和STAR最新数据，显著提升了d与dbar夸克分布及张量电荷的提取精度。
We present a determination of the non-singlet transversity parton distribution function (PDF) of the nucleon, normalized with respect to the tensor charge at $μ^2=2$ GeV$^2$ from lattice quantum chromodynamics. We apply the pseudo-distribution approach, using a gauge ensemble with a lattice spacing of 0.094 fm and the light quark mass tuned to a pion mass of 358 MeV. We extract the transversity PDF from the analysis of the short-distance behavior of the Ioffe-time pseudo-distribution using the leading-twist next-to-leading order (NLO) matching coefficients calculated for transversity. We recon…
A high-statistics measurement of transverse spin effects in dihadron production from muon-proton semi-inclusive deep-inelastic scattering
本文测量了μ子在横向极化质子（NH $_{3}$）靶上深度非弹性散射中双强子产生的方位不对称性。它们通过测量单个强子产生中的柯林斯不对称性提供了独立的横向分布函数。这些数据是在$2010$年用COMPASS光谱仪使用欧洲核子研究中心SPS的$160\,\mbox{GeV}/c$ μ子束拍摄的，比以前发表的$2007$年拍摄的数据增加了大约三倍。测得的相当大的不对称性是在良好的协议与公布的数据。柯林斯不对称性和双强子不对称性的近似相等的观察，提出了一个共同的物理机制，在潜在的碎裂。
The transversity was recently extracted from data on the production of hadron pairs in semi-inclusive deep-inelastic scattering. This analysis can be conveniently performed in the framework of collinear factorization where the elementary mechanism is represented by the simple product of transversity and of a suitable chiral-odd function describing the fragmentation of a transversely polarized parton into a pair of hadrons inside the same current jet. The same elementary mechanism was predicted long ago to generate an asymmetry in the azimuthal distribution of the hadron pairs when they are pro…
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