Collins azimuthal asymmetries of hadron production inside jets

Kang, Zhong Bo; Prokudin, Alexei; Ringer, Felix; Yuan, Feng

doi:10.1016/j.physletb.2017.10.031

Cited by 70 publications

(78 citation statements)

References 84 publications

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“…The Kang-ProkudinRinger-Yuan (KPRY) and KPRY-NLL predictions are based upon Ref. [78]. The KPRY-NLL curves assume TMD evolution up to next-to-leading log, while the KPRY curves assume no TMD evolution.…”

Section: Comparison To Modelsmentioning

confidence: 99%

Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at s=500 GeV

Adamczyk¹,

Adams²,

Adkins³

et al. 2018

Phys. Rev. D

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We report the first measurements of transverse single-spin asymmetries for inclusive jet and jet þ π AE production at midrapidity from transversely polarized proton-proton collisions at ffiffi ffi s p ¼ 500 GeV. The data were collected in 2011 with the STAR detector sampled from 23 pb −1 integrated luminosity with an average beam polarization of 53%. Asymmetries are reported for jets with transverse momenta 6 < p T < 55 GeV=c and pseudorapidity jηj < 1. Presented are measurements of the inclusive-jet azimuthal transverse single-spin asymmetry, sensitive to twist-3 initial-state quark-gluon correlators; the Collins asymmetry, sensitive to quark transversity coupled to the polarized Collins fragmentation function; and the first measurement of the "Collins-like" asymmetry, sensitive to linearly polarized gluons. Within the present statistical precision, inclusive-jet and Collins-like asymmetries are small, with the latter allowing the first experimental constraints on gluon linear polarization in a polarized proton. At higher values of jet transverse momenta, we observe the first nonzero Collins asymmetries in polarized-proton collisions, with a statistical significance of greater than 5σ. The results span a range of x similar to results from semi-inclusive deep-inelastic scattering but at much higher Q 2 . The Collins results enable tests of universality and factorization breaking in the transverse momentum-dependent formulation of perturbative quantum chromodynamics.

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Section: Comparison To Modelsmentioning

confidence: 99%

Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at s=500 GeV

Adamczyk¹,

Adams²,

Adkins³

et al. 2018

Phys. Rev. D

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“…Tagging the parton flavor through identified hadrons in jets has recently become an important tool, especially in pp collisions, to study PDFs and fragmentation functions. (For theoretical details and first experimental results see Reference [39,40] and [41,42]). In the following, we apply this method to tag the parton flavor content of the photon at an EIC.…”

Section: B Flavor Taggingmentioning

confidence: 99%

Photon structure studied at an electron ion collider

et al. 2017

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A future Electron Ion Collider (EIC) will be able to provide collisions of polarized electrons with protons and heavy ions over a wide range of center-of-mass energies (20 GeV to 140 GeV) at an instantaneous luminosity of 10 33 −10 34 cm −2 s −1 . One of its promising physics programs is the study of the partonic structure of quasi-real photons. Measuring di-jets in quasi-real photoproduction events, one can effectively access the underlying parton dynamics of the photons. In this paper, we discuss the feasibility of tagging resolved photon processes and measuring the di-jet cross section as a function of jet transverse momentum in the range of 0.01 < x rec γ < 1 at an EIC. It will be shown that both unpolarized and polarized parton distributions in the photon can be extracted, and that the flavor of the parton can be tagged at an EIC.

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“…The STAR Collins asymmetries [15,16] have been compared with model calculations [24,25] based upon SIDIS and e + e data. The comparisons for the p s = 500 GeV data [15] are shown in the right-hand panel of Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Illuminating Nucleon Structure at STAR J. L. Drachenberg [20] (left and center) and charged-pion Collins [15] (right) asymmetries at p s = 500 GeV in comparison to model calculations based on SIDIS [23,24,25]. Weak boson asymmetries show a strong preference for models that assume the sign-change [7], provided suppression due to TMD evolution is small.…”

Section: Pos(dis2017)252mentioning

confidence: 99%

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Illuminating Nucleon Structure Through Polarized Proton-Proton Collisions at STAR

Drachenberg¹

2017

Proceedings of XXV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2017)

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During the past decade, the experiments of the RHIC spin program have provided critical insight into the spin structure of the nucleon, in particular shedding light on the roles played by gluon and sea-quark helicity. In the forthcoming RHIC run, attention will be devoted to transverse-spin phenomena. Over the last decade, theoretical and experimental engagement of this oft-challenging subject has unlocked tantalizing opportunities for new insight into nucleon structure, e.g. with higher dimensions in partonic momentum space. The STAR experiment continues this exploration through an array of measurements from high-energy polarized-proton collisions. Among these studies are the production of weak bosons, azimuthal distributions of hadrons within jets, dihadron correlations, and particle production at large pseudorapidity. Recent breakthroughs may illuminate further longstanding questions: Do factorization and universality extend to the transverse-momentum-dependent (TMD) picture in proton-proton collisions? How do TMD functions evolve with changing kinematics? Beyond existing probes, future measurements will enable even wider frontiers in understanding QCD and nucleon structure.

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Collins azimuthal asymmetries of hadron production inside jets

Cited by 70 publications

References 84 publications

Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at s=500 GeV

Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at s=500 GeV

Photon structure studied at an electron ion collider

Illuminating Nucleon Structure Through Polarized Proton-Proton Collisions at STAR

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