Measurement of Collins asymmetries in inclusive production of charged pion pairs in e^+e^- annihilation at BABAR

Abstract

We present measurements of Collins asymmetries in the inclusive process e+e- -->pi pi X, where pi stands for charged pions, at a center-of-mass energy of 10.6 GeV. We use a data sample of 468 fb-1 collected by the BABAR experiment at the PEP-II B factory at SLAC, and consider pairs of charged pions produced in opposite hemispheres of hadronic events. We observe clear asymmetries in the distributions of the azimuthal angles in two distinct reference frames. We study the dependence of the asymmetry on several kinematic variables, finding that it increases with increasing pion momentum and momentum transverse to the analysis axis, and with increasing angle between the thrust and beam axis.

29 pages, 27 pdf figures

References in corpus (4)

• Measurement of Azimuthal Asymmetries in Inclusive Production of Hadron Pairs in e+e- Annihilation at \sqrt{s} = 10.58 GeV
• Angular dependences in inclusive two-hadron production at BELLE
• Collins fragmentation function for pions and kaons in a spectator model
• Collins effect in semi-inclusive deeply inelastic scattering and in electron positron annihilation

Cited by in corpus (58)

• Extraction of Quark Transversity Distribution and Collins Fragmentation Functions with QCD Evolution
• STCF Conceptual Design Report: Volume 1 -- Physics & Detector
• Parton Fragmentation Functions
• Understanding the large-distance behavior of transverse-momentum-dependent parton densities and the Collins-Soper evolution kernel
• Origin of single transverse-spin asymmetries in high-energy collisions
• Collins functions for pions from SIDIS and new e+e- data: a first glance at their transverse momentum dependence
• A high-statistics measurement of transverse spin effects in dihadron production from muon-proton semi-inclusive deep-inelastic scattering
• Collins azimuthal asymmetries of hadron production inside jets
• Measurement of azimuthal asymmetries in inclusive charged dipion production in $e^{+}{e}^{-}$ annihilations at $\sqrt{s}$ = 3.65 GeV
• Polarized hadron pair production from electron-positron annihilation
• Nucleon tensor charge from Collins azimuthal asymmetry measurements
• Azimuthal transverse single-spin asymmetries of inclusive jets and charged pions within jets from polarized-proton collisions at $\sqrt{s}=500$ GeV
• Transverse spin effects in hard semi-inclusive collisions
• Cross Section and Transverse Single-Spin Asymmetry of $\eta$ Mesons in $p^{\uparrow }+p$ Collisions at $\sqrt{s}=200$ GeV at Forward Rapidity
• Updated QCD global analysis of single transverse-spin asymmetries I: Extracting $\tilde{H}$, and the role of the Soffer bound and lattice QCD
• Extracting the transversity distributions from single-hadron and dihadron production
• Where do we stand with a 3-D picture of the proton?
• Collins asymmetries in inclusive charged $KK$ and $K\pi$ pairs produced in $e^{+}{e}^{-}$ annihilation
• Tensor polarization dependent fragmentation functions and e+e-\to V πX at high energies
• Leading and higher twist contributions in semi-inclusive e+e- annihilation at high energies
• Transverse Spin Structure of the Nucleon
• Role of the Soffer bound in determination of transversity and the tensor charge
• Phenomenology of transverse spin: past, present and future
• Transverse momentum dependent production cross sections of charged pions, kaons and protons produced in inclusive $e^{+}{e}^{-}$ annihilation at $\sqrt{s}=$ 10.58 GeV
• Extracting the Kaon Collins function from $e^{+}{e}^{-}$ hadron pair production data
• Invariant-mass and fractional-energy dependence of inclusive production of di-hadrons in $e^{+}{e}^{-}$ annihilation at $\sqrt{s}=$ 10.58 GeV
• Multidifferential study of identified charged hadron distributions in $Z$-tagged jets in proton-proton collisions at $\sqrt{s}=$13 TeV
• Recursive model for the fragmentation of polarized quarks
• Azimuthal asymmetries of back-to-back ${\pi }^{\pm }-({\pi }^0,\eta ,{\pi }^{\pm })$ pairs in $e^{+}{e}^{-}$ annihilation
• Longitudinal and transverse polarizations of $\Lambda$ hyperon in unpolarized SIDIS and $e^{+}{e}^{-}$ annihilation
• Azimuthal transverse single-spin asymmetries of inclusive jets and identified hadrons within jets from polarized $pp$ collisions at $\sqrt{s}$ = 200 GeV
• Production of vector mesons in the String+${}^3{P}_0$ model of polarized quark fragmentation
• Twist-4 contributions to semi-inclusive $e^{+}{e}^{-}$-annihilation process
• Beam-helicity asymmetries for single-hadron production in semi-inclusive deep-inelastic scattering from unpolarized hydrogen and deuterium targets
• Interplay among transversity induced asymmetries in hadron leptoproduction
• Semi-Inclusive ${\pi }_0$ target and beam-target asymmetries from 6 GeV electron scattering with CLAS
• Nonperturbative-transverse-momentum effects and evolution in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ collisions at $\sqrt{s}$=510 GeV
• Electron-Ion Collider impact study on the tensor charge of the nucleon
• Role of transverse momentum dependence of unpolarised parton distribution and fragmentation functions in the analysis of azimuthal spin asymmetries
• Semi-inclusive back-to-back production of a hadron pair and a single hadron in $e^{+}{e}^{-}$ annihilation
• Transverse momentum dependent of charged pion, kaon and proton/antiproton fragmentation functions from $e^{+}{e}^{-}$ annihilation process
• A simplified recursive ${}^3{P}_0$ model for the fragmentation of polarized quarks
• Inclusive and semi-inclusive production of spin-3/2 hadrons in $e^{+}{e}^{-}$ annihilation
• Collins and Sivers transverse-spin asymmetries in inclusive muoproduction of ${\rho }^0$ mesons
• Nonperturbative transverse-momentum-dependent effects in dihadron and direct photon-hadron angular correlations in $p+p$ collisions at $\sqrt{s}=200$ GeV
• Transversity distributions from difference asymmetries in semi-inclusive DIS
• Double Collins effect in $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }X$ process in a diquark spectator model
• Spin Orbit Correlations and the Structure of the Nucleon
• Predicting the $\sin {\varphi }_S$ Single-Spin-Asymmetry of $\Lambda$ Production off transversely polarized nucleon in SIDIS
• Overview of TMD evolution
• Collins function for pion-in-jet production in polarized $pp$ collisions: a test of universality and factorization
• ECCE Sensitivity Studies for Single Hadron Transverse Single Spin Asymmetry Measurements
• Applying different angular ordering constraints and $k_t$-factorization approaches to the single inclusive hadron production in the $e^{+}{e}^{-}$ annihilation processes
• Nonperturbative factorization breaking and color entanglement effects in dihadron and direct photon-hadron angular correlations in $p$$+$$p$ and $p$$+$A collisions
• Collins asymmetries for pion-in-jet production in polarized $\ell p$ collisions at the EIC
• Exploring the Quark Transversity and the Collins Fragmentation Functions using Polarized $pp$ Collisions at STAR
• Physics case for low-$\sqrt{s}$ QCD studies at FCC-ee
• Transverse Single-Spin Asymmetries of Midrapidity Direct Photons, Neutral Pions, and Eta Mesons in 200 GeV Polarized Proton-Proton Collisions at PHENIX