Institute: MPI für Physik     Collection: YB 2016     Display Documents

ID: 716479.0, MPI für Physik / YB 2016
Study of $\\pi^0$ pair production in single-tag two-photon collisions
Authors:
Date of Publication (YYYY-MM-DD):2016
Title of Journal:Physical Review D
Journal Abbrev.:Phys.Rev.D
Issue / Number:93
Start Page:032003
Audience:Not Specified
Intended Educational Use:No
Abstract / Description:We report a measurement of the differential cross section of $\\pi^0$ pair production in single-tag two-photon collisions, $\\gamma^* \\gamma \\to \\pi^0 \\pi^0$, in $e^+ e^-$ scattering. The cross section is measured for $Q^2$ up to 30 GeV$^2$, where $Q^2$ is the negative of the invariant mass squared of the tagged photon, in the kinematic range 0.5 GeV < W < 2.1 GeV and $|\\cos \\theta^*|$ < 1.0 for the total energy and pion scattering angle, respectively, in the $\\gamma^* \\gamma$ center-of-mass system. The results are based on a data sample of 759 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. The transition form factor of the $f_0(980)$ and that of the $f_2(1270)$ with the helicity-0, -1, and -2 components separately are measured for the first time and are compared with theoretical calculations.
Classification / Thesaurus:Belle II
Comment of the Author/Creator:36 pages, 37 figures, 11 tables, Belle Preprint 2015-15, KEK Preprint 2015-24
External Publication Status:published
Document Type:Article
Communicated by:MPI für Physik
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