The transverse momentum distribution of hadrons within jets

Kang, Zhong‐Bo; Liu, Xiaohui; Ringer, Felix; Xing, Hongxi

doi:10.1007/jhep11(2017)068

Cited by 75 publications

(107 citation statements)

References 121 publications

(193 reference statements)

Supporting

Mentioning

106

Contrasting

Order By: Relevance

“…The size of any such factorization breaking is not known. It has recently been argued that the cross section for hadrons within jets produced from proton-proton collisions does factorize and only depends upon universal TMD fragmentation functions, decoupled from TMD PDFs [29]. It has also been shown that as the value of the soft TMD scale becomes larger, the twist-3 and TMD approaches are mutually consistent [30].…”

Section: Introductionmentioning

confidence: 95%

“…These pions are required to have 0.1 < z < 0.8, where z is the ratio of pion momentum to jet momentum (note that this definition for z is referred to as z h in Ref. [29]). A significant portion of pions with z < 0.1 in low p T jets arises from underlying event backgrounds, while z ¼ 0.8 marks the limit for sufficient statistics in this data set.…”

Section: E Pion Selectionmentioning

confidence: 99%

“…Furthermore, polarized-proton collisions are directly sensitive to gluonic subprocesses, enabling the study of the role of gluons in the transverse polarization structure of the nucleon. Moreover, since questions remain concerning the magnitude of potential TMD factorization breaking in hadronic interactions [27][28][29], data from polarized-proton collisions can provide unique and crucial experimental insight into these theoretical questions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 95%

Section: E Pion Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…For alternative definitions of similar observables see Refs. [21,22]. The operator definition of TMD-FJF is the following,…”

Section: Transverse Momentum Dependent Fragmenting Jet Functionsmentioning

confidence: 99%

Transverse Momentum Dependent Fragmenting Jet Functions with Applications to Quarkonium Production

Makris

2018

Proceedings of QCD Evolution 2017 — PoS(QCDEV2017)

View full text Add to dashboard Cite

We briefly review the framework of fragmenting jet functions (FJFs) introduced in soft collinear effective theory (SCET) to describe the fragmentation of an identified hadron within a jet. We illustrate how FJFs can be integrated with the leading power (LP) factorization in non-relativistic quantum chromodynamics (NRQCD) in studies of quarkonium production within jets. We present recent theoretical, experimental, and computational developments. We also present the framework of transverse momentum dependent (TMD) FJFs which describe the fragmentation of a hadron within a jet and the transverse momentum of the identified hadron is measured with respect to the jet axis. We show how the measurement of the transverse momentum spectrum can help discriminate between the leading production mechanisms of J/ψ.

show abstract

“…The size of any such factorization breaking is not known. It has recently been argued that the cross section for hadrons within jets produced in p + p does factorize and only depends upon universal TMD fragmentation functions, decoupled from TMD PDFs [10]. In contrast to TMDs, IFF asymmetries persist in the collinear framework of pQCD, where factorization and universality are expected to hold [11].…”

Section: Introductionmentioning

confidence: 99%

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)

View full text Add to dashboard Cite

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.

show abstract

The transverse momentum distribution of hadrons within jets

Cited by 75 publications

References 121 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

Transverse Momentum Dependent Fragmenting Jet Functions with Applications to Quarkonium Production

Illuminating Nucleon Structure Through Polarized Proton-Proton Collisions at STAR

Contact Info

Product

Resources

About