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

Abstract

We report the first measurements of transverse single-spin asymmetries for inclusive jet and jet + ${\pi }^{\pm }$ production at midrapidity from transversely polarized proton-proton collisions at $\sqrt{s}=500$ 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 $6<p_{T,jet}<55$ GeV/c and pseudorapidity $|\eta |<1$. 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 non-zero Collins asymmetries in polarized-proton collisions, with a statistical significance of greater than $5\sigma$. The results span a range of x similar to results from SIDIS 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.

arXiv comment19 pages, 13 figures; Changes for version 2, as accepted by PRD: additional figure (new Fig. 2) comparing kinematic range of these data to existing DIS data, minor text updates for clarity

References in corpus (74)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The anti-k_t jet clustering algorithm
• FastJet user manual
• New parton distributions for collider physics
• Fragmentation of Transversely Polarized Quarks Probed in Transverse Momentum Distributions
• Tuning Monte Carlo Generators: The Perugia Tunes
• Leading-twist Single-transverse-spin asymmetries: Drell-Yan and Deep-Inelastic Scattering
• Time-reversal odd distribution functions in leptoproduction
• Final-State Interactions and Single-Spin Asymmetries in Semi-Inclusive Deep Inelastic Scattering
• The STAR Time Projection Chamber: A Unique Tool for Studying High Multiplicity Events at RHIC
• Combined Measurement and QCD Analysis of the Inclusive ep Scattering Cross Sections at HERA
• QCD Factorization for Semi-Inclusive Deep-Inelastic Scattering at Low Transverse Momentum
• Global analysis of fragmentation functions for pions and kaons and their uncertainties
• Single-spin asymmetries in semi-inclusive deep-inelastic scattering on a transversely polarized hydrogen target
• Universality of T-odd effects in single spin and azimuthal asymmetries
• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• A first unbiased global determination of polarized PDFs and their uncertainties
• Universality of soft and collinear factors in hard-scattering factorization
• QCD Factorization for Spin-Dependent Cross Sections in DIS and Drell-Yan Processes at Low Transverse Momentum
• Single Transverse-Spin Asymmetries in Hadronic Pion Production
• Fragmentation Functions from Flavour-inclusive and Flavour-tagged e^+e^- Annihilations
• First Measurement of the Transverse Spin Asymmetries of the Deuteron in Semi-Inclusive Deep Inelastic Scattering
• Evidence for polarization of gluons in the proton
• Transversity and Collins functions from SIDIS and e+e- data
• Observation of the Naive-T-odd Sivers Effect in Deep-Inelastic Scattering
• Global Analysis of Helicity Parton Densities and Their Uncertainties
• Cross Sections and Transverse Single-Spin Asymmetries in Forward Neutral-Pion Production from Proton Collisions at \sqrt{s} = 200 GeV
• Collins and Sivers asymmetries for pions and kaons in muon-deuteron DIS
• Parton-to-Pion Fragmentation Reloaded
• A new measurement of the Collins and Sivers asymmetries on a transversely polarised deuteron target
• Single Spin Asymmetries in Charged Pion Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely Polarized ${}^3$He Target
• Extraction of Quark Transversity Distribution and Collins Fragmentation Functions with QCD Evolution
• No Generalized TMD-Factorization in the Hadro-Production of High Transverse Momentum Hadrons
• Measurement of Azimuthal Asymmetries in Inclusive Production of Hadron Pairs in e+e- Annihilation at Belle
• Update on transversity and Collins functions from SIDIS and e+ e- data
• k_T factorization is violated in production of high-transverse-momentum particles in hadron-hadron collisions
• Effects of transversity in deep-inelastic scattering by polarized protons
• A Unified Picture for Single Transverse-Spin Asymmetries in Hard Processes
• Determination of Polarized PDFs from a QCD Analysis of Inclusive and Semi-inclusive Deep Inelastic Scattering Data
• Measurement of the Collins and Sivers asymmetries on transversely polarised protons
• Forward Neutral Pion Transverse Single Spin Asymmetries in p+p Collisions at \sqrt{s}=200 GeV
• QCD Analysis of the Polarized World Data
• QCD Analysis of Polarized Deep Inelastic Scattering Data
• Single Transverse Spin Asymmetries of Identified Charged Hadrons in Polarized p+p Collisions at $\sqrt{s}$ = 62.4 GeV
• Single Transverse-Spin Asymmetry in Drell-Yan Production at Large and Moderate Transverse Momentum
• Towards an explanation of transverse single-spin asymmetries in proton-proton collisions: the role of fragmentation in collinear factorization
• Precision Measurement of the Longitudinal Double-spin Asymmetry for Inclusive Jet Production in Polarized Proton Collisions at $\sqrt{s}=200$ GeV
• Single-Transverse Spin Asymmetry in Semi-Inclusive Deep Inelastic Scattering
• Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Collins asymmetries
• Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised proton
• Extensive Particle Identification with TPC and TOF at the STAR Experiment
• Measurement of Collins asymmetries in inclusive production of charged pion pairs in e^+e^- annihilation at BABAR
• General partonic structure for hadronic spin asymmetries
• Collins functions for pions from SIDIS and new e+e- data: a first glance at their transverse momentum dependence
• Transverse Single-Spin Asymmetry and Cross-Section for pi0 and eta Mesons at Large Feynman-x in Polarized p+p Collisions at sqrt(s)=200 GeV
• Jet production in (un)polarized pp collisions: dependence on jet algorithm
• Azimuthal Asymmetric Distribution of Hadrons Inside a Jet at Hadron Collider
• Collins azimuthal asymmetries of hadron production inside jets
• The STAR Vertex Position Detector
• The transverse momentum distribution of hadrons within jets
• Test the time-reversal modified universality of the Sivers function
• Measurement of the analyzing power in pp elastic scattering in the peak CNI region at RHIC
• Indication on the process-dependence of the Sivers effect
• Azimuthal asymmetries for hadron distributions inside a jet in hadronic collisions
• Dihadron interference fragmentation functions in proton-proton collisions
• Observation of Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs in $p^{\uparrow }+p$ at $\sqrt{s}=200$ GeV
• Testing the universality of the Collins function in pion-jet production at RHIC
• Transverse spin-dependent azimuthal correlations of charged pion pairs measured in p${}^{\uparrow }$+p collisions at $\sqrt{s}$ = 500 GeV
• Collins Asymmetry at Hadron Colliders
• Improving the dE/dx calibration of the STAR TPC for the high-pT hadron identification
• 2-soft-gluon exchange and factorization breaking
• Single transverse-spin asymmetry for direct-photon and single-jet productions at RHIC
• Update on extraction of transversity PDF from inclusive di-hadron production

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• Jet-based measurements of Sivers and Collins asymmetries at the future Electron-Ion Collider
• Polarized jet fragmentation functions
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• Updated QCD global analysis of single transverse-spin asymmetries I: Extracting $\tilde{H}$, and the role of the Soffer bound and lattice QCD
• Measurement of transverse single-spin asymmetries of ${\pi }^0$ and electromagnetic jets at forward rapidity in 200 and 500 GeV transversely polarized proton-proton collisions
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• Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in $p+p$ collisions at $\sqrt{s}=200$ GeV
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• Measurement of lepton-jet correlation in deep-inelastic scattering with the H1 detector using machine learning for unfolding
• Energy Independence of the Collins Asymmetry in $p^{\uparrow }p$ Collisions
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• Measurement of Transverse Spin Dependent Azimuthal Correlations of Charged Pion(s) in $p^{\uparrow }p$ Collisions at $\sqrt{s}=200$ GeV at STAR
• Parton Fragmentation Functions
• Recent results on cold-QCD from RHIC
• NNLO soft function for threshold single inclusive jet production
• Jet Charge with Global Event Shapes: Probing Quark Flavor Dynamics
• Exploring the Quark Transversity and the Collins Fragmentation Functions using Polarized $pp$ Collisions at STAR
• Nonperturbative factorization breaking and color entanglement effects in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ and $p$$+$A collisions
• Transverse Single-Spin Asymmetries of Midrapidity Direct Photons, Neutral Pions, and Eta Mesons in 200 GeV Polarized Proton-Proton Collisions at PHENIX