Di-hadron production at Jefferson Laboratory

Pereira, S. Anefalos

doi:10.22323/1.203.0231

Cited by 5 publications

(6 citation statements)

References 11 publications

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“…Even though twist-3 contributions are suppressed by one order of 1 /Q, this factor is not large at JLab12 and twist-3 PDFs themselves can be large. In fact, evidence of twist-3 PDFs has been seen in preliminary results from COMPASS and CLAS6 [2,20,21]. The effects are of the same order of magnitude than those of leading twist functions.…”

Section: Accessing Polarization Dependence Of Quark-gluon Interaction...mentioning

confidence: 87%

Novel experimental probes of QCD in SIDIS and $e^+e^-$ annihilation

Vossen

2018

Preprint

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Semi-inclusive deep inelastic Scattering (SIDIS) has been a very successful tool to investigate the partonic structure of the nucleon over the last decade. Compared to inclusive DIS, information about the quantum numbers of the struck quark can be inferred from the identity, distribution and polarization of the final state hadrons. Up to now, virtually all knowledge about the quark-gluon structure of the nucleon from SIDIS has been gained from distributions of independently observed scalar hadrons. However, given the amount of data current and future experiments at JLab, RHIC, KEK and the EIC will collect, new paradigms have to be explored to leverage the statistical power of the data. Similar to other felds in nuclear and particle physics, it is natural to move towards the exploration of more complex correlations in the observed fi nal state. This contribution will discuss recent results and future prospects of using di-hadron correlations and polarized hyperon probes to study QCD in SIDIS, pp and e+eannihilation. Both of these probes exploit additional degrees of freedom in the final state, given by the relative momentum of the di-hadron pair and the hyperon polarization, respectively. This contribution will focus on recent results and opportunities opened by these probes to study nucleon structure, hadronization and QCD in novel ways. The focus will be on planned SIDIS measurements at CLAS12 at JLab and e+e-at Belle II.

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Section: Accessing Polarization Dependence Of Quark-gluon Interaction...mentioning

confidence: 87%

Novel experimental probes of QCD in SIDIS and $e^+e^-$ annihilation

Vossen

2018

Preprint

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“…Pions coming from the fragmentation of the target remnants are excluded by requesting positive values for the Feynman x F variable. An analogous measurement is carried on a longitudinally polarized NH 3 target, that aims at the extraction of both single and double-spin asymmetries [70]. In Fig.…”

Section: The Clas Measurementmentioning

confidence: 99%

“…The two combined measurements will allow to separately extract e uv (x) and e dv (x). Because of the expected high Solid squares for an unpolarized hydrogen target [69], empty circles for a longitudinally polarized N H3 target [70].…”

Section: The Clas Measurementmentioning

confidence: 99%

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Di-hadron fragmentation and mapping of the nucleon structure

Pisano

Radici

2016

Eur. Phys. J. A

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The fragmentation of a colored parton directly into a pair of colorless hadrons is a nonperturbative mechanism that offers important insights into the nucleon structure. Di-hadron fragmentation functions can be extracted from semi-inclusive electron-positron annihilation data. They also appear in observables describing the semi-inclusive production of two hadrons in deep-inelastic scattering of leptons off nucleons or in hadron-hadron collisions. When a target nucleon is transversely polarized, a specific chiral-odd di-hadron fragmentation function can be used as the analyzer of the net density of transversely polarized quarks in a transversely polarized nucleon, the so-called transversity distribution. The latter can be extracted through suitable single-spin asymmetries in the framework of collinear factorization, thus in a much simpler framework with respect to the traditional one in single-hadron fragmentation. At subleading twist, the same chiral-odd di-hadron fragmentation function provides the cleanest access to the poorly known twist-3 parton distribution e(x), which is intimately related to the mechanism of dynamical chiral symmetry breaking in QCD. When sensitive to details of transverse momentum dynamics of partons, the di-hadron fragmentation functions for a longitudinally polarized quark can be connected to the longitudinal jet handedness to explore possible effects due to CP −violation of the QCD vacuum. In this review, we outline the formalism of di-hadron fragmentation functions, we discuss different observables where they appear and we present measurements and future worldwide plans.PACS. 13.87.Fh Fragmentation into hadrons -13.66.Bc Hadron production in e − e + interactions -13.60.Hb Total and inclusive cross section (including deep-inelastic processes) -12.38.-t Quantum chromodynamics

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“…Although transverse momentum-dependent factorization of the cross section at subleading twist is not yet proven [9], Q 2 at CLAS12 reaches down to 1 GeV 2 , where twist-3 effects are nonnegligible. Collinear twist-3 PDFs are significant [10], however subleading-twist DiFFs are likely subdominant [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Multidimensional partial wave analysis of SIDIS dihadron beam spin asymmetries at CLAS12

Dilks¹

2021

Preprint

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Dihadron beam spin asymmetries provide a wide range of insights into nucleon structure and hadronization. Recent measurements at CLAS12 provide the first empirical evidence of nonzero G ⊥ 1 , the parton helicity-dependent dihadron fragmentation function (DiFF) encoding spin-momentum correlations in hadronization. These measurements also allow for a point-by-point extraction of the subleading-twist PDF e(x) in a collinear framework. We observe different behavior of the asymmetries in different invariant mass regions, motivating a fully multidimensional study. The DiFFs also expand in terms of partial waves, each corresponding to the interference of dihadrons of particular polarizations. Altogether a fully multidimensional partial wave analysis is needed, and this presentation will summarize the efforts and results obtained thus far.

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Di-hadron production at Jefferson Laboratory

Cited by 5 publications

References 11 publications

Novel experimental probes of QCD in SIDIS and $e^+e^-$ annihilation

Novel experimental probes of QCD in SIDIS and $e^+e^-$ annihilation

Di-hadron fragmentation and mapping of the nucleon structure

Multidimensional partial wave analysis of SIDIS dihadron beam spin asymmetries at CLAS12

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