Measurement of transverse single-spin asymmetries for dijet production in polarized proton-proton collisions at $\sqrt{\mathbf{s}}$ = 200 $\mathrm{GeV}$

Abstract

We report a new measurement of transverse single-spin asymmetries for dijet production in collisions of polarized protons at $\sqrt{s}$ = 200 $\mathrm{GeV}$. Correlations between the proton spin and the transverse momenta of its partons, each perpendicular to the proton momentum direction, are probed at high $Q^2$ $\approx$160 ${\mathrm{GeV}}^2$. Evidence for nonzero Sivers effects is measured for the first time in dijets from proton-proton collisions, but only when the jets are sorted by their net charge, which enhances the otherwise canceling opposite-sign $u$- or $d$-quark contributions to separate data samples. The resulting asymmetries are compared to recent theoretical calculations. Separately, the associated Sivers observable $⟨k_T⟩$, the average parton transverse momentum, is extracted using a simple kinematics approach which further enables a determination of the individual partonic contributions to the observed asymmetries.

arXiv commentmain text: 8 pages with 5 figures; supplement text: 2 figures, 4 tables; now updated following PRD-L publication. For this update: some main and supplement text changes are made to clarify and reduce length. Note previously, had added information and references in response to PRL referee comments with minor changes to former Figs. 2-4 and new figure (comparing to theory) added

References in corpus (47)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The anti-k_t jet clustering algorithm
• Tuning Monte Carlo Generators: The Perugia Tunes
• Leading-twist Single-transverse-spin asymmetries: Drell-Yan and Deep-Inelastic Scattering
• 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
• 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
• The Spin Structure of the Nucleon
• Single Transverse-Spin Asymmetries in Hadronic Pion Production
• Observation of the Naive-T-odd Sivers Effect in Deep-Inelastic Scattering
• Sivers Effect for Pion and Kaon Production in Semi-Inclusive Deep Inelastic Scattering
• Single Spin Asymmetries in Charged Pion Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely Polarized ${}^3$He Target
• No Generalized TMD-Factorization in the Hadro-Production of High Transverse Momentum Hadrons
• k_T factorization is violated in production of high-transverse-momentum particles in hadron-hadron collisions
• QCD Evolution of the Sivers Asymmetry
• Single-Transverse Spin Asymmetries: From DIS to Hadronic Collisions
• Extracting the Sivers function from polarized SIDIS data and making predictions
• Experimental investigation of transverse spin asymmetries in muon-p SIDIS processes: Sivers asymmetries
• Jet Charge at the LHC
• Sivers effect in semi-inclusive deeply inelastic scattering
• Origin of single transverse-spin asymmetries in high-energy collisions
• TMD Evolution: Matching SIDIS to Drell-Yan and W/Z Boson Production
• Unpolarized Transverse Momentum Distributions from a global fit of Drell-Yan and Semi-Inclusive Deep-Inelastic Scattering data
• First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process
• Collins and Sivers asymmetries in muonproduction of pions and kaons off transversely polarised proton
• Single spin asymmetries in hadron-hadron collisions
• Asymmetric jet correlations in p p^\uparrow scattering
• Constraining quark angular momentum through semi-inclusive measurements
• Measurement of the transverse single-spin asymmetry in $p^{\uparrow }+p\to W^{\pm }/Z^0$ at RHIC
• Study of the sign change of the Sivers function from STAR Collaboration W/Z production data
• Sivers Mechanism for Gluons
• Measurement of the analyzing power in pp elastic scattering in the peak CNI region at RHIC
• Global analysis of the Sivers functions at NLO+NNLL in QCD
• N${}^3$LO extraction of the Sivers function from SIDIS, Drell-Yan, and $W^{\pm }/Z$ data
• Single-Transverse Spin Asymmetry in Dijet Correlations at Hadron Colliders
• Single Spin Asymmetries of Inclusive Hadrons Produced in Electron Scattering from a Transversely Polarized ${}^3$He Target
• Transverse spin effects in hard semi-inclusive collisions
• The three-dimensional distribution of quarks in momentum space
• Transverse Spin Structure of the Nucleon
• 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
• Longitudinal Double-Spin Asymmetries for Dijet Production at Intermediate Pseudorapidity in Polarized $pp$ Collisions at $\sqrt{s}$ = 200 GeV
• The Sivers Asymmetry in Hadronic Dijet Production
• Reweighting the Sivers function with jet data from STAR
• Factorization and its Breaking in Dijet Single Transverse Spin Asymmetries in $pp$ Collisions
• Sivers Effect Asymmetries in Hadronic Collisions