Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session H09: Hadronic Interactions |
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Sponsoring Units: DNP GHP Chair: Kenneth Hicks, Ohio University Room: Sheraton Governor's Square 11 |
Sunday, April 14, 2019 10:45AM - 10:57AM |
H09.00001: Measurement of the Photon Beam Asymmetry Σ for γ+p->K+Σ0 at Eγ = 8.5 GeV in GlueX Nilanga Wickramaarachchi, Moskov Amaryan We present measurements of the photon beam asymmetry Σ for the reaction γp->K+Σ0(1193) using the GlueX experiment in Jefferson Lab's Hall D. Data were collected using a linearly polarized photon beam with energy range 8.2-8.8 GeV incident on a liquid hydrogen target. Asymmetries are measured as functions of Mandelstam variables t and u. These are the first exclusive measurements of the photon beam asymmetry Σ in this reaction at high energies. In the t-channel, results show that the reaction is dominated by the natural-parity exchange of presumably the K*(892) meson, as predicted by theoretical models. Results obtained for the u-channel are consistent with an intermediate baryon exchange mechanism predicted by theoretical models. |
Sunday, April 14, 2019 10:57AM - 11:09AM |
H09.00002: Preliminary results for η/η' photoproduction cross sections between 3 and 6 GeV at the GlueXexperiment Mahmoud M Kamel The GlueX experiment at Jefferson Lab studies the light meson spectrum and searches for hybrid and exotic mesons. As part of this program we determine photoproduction cross sections in a new, previously unexplored kinematic regime, thus providing fundamental information about underlying reaction mechanisms. During the Fall 2018 run period, a subset of low energy photoproduction data has been collected over 4 days. The status of cross section analysis for photoproduced η/η' mesons will be presented for beam energies between 2.9 and 5.9 GeV. The η mesons have been identified through two decay channels, γγ and π+ π− π0. The η' mesons have been identified via the decay channels, π+ π− η, and π+ π− γ. From these data, branching ratios were extracted that can be compared to published Particle Data Group (PDG) values and provide calibration information. |
Sunday, April 14, 2019 11:09AM - 11:21AM |
H09.00003: Quasi-free cross section measurements of the π+π- electroproduction off the bound proton in deuterium Iuliia Skorodumina During the last decades, experiments of meson electroproduction off a deuterium target have been inducing more and more scientific attention, as they offer a great opportunity to explore exclusive processes happening off bound nucleons and to study final state interactions as well as effects of the Fermi motion in detail. |
Sunday, April 14, 2019 11:21AM - 11:33AM |
H09.00004: The Neutral Pion Life Time: Final Result from the PrimEx Experiments Ashot Gasparian The neutral pion is the lightest strongly interacting particle in Nature. Therefore, the properties of π0 decay are especially sensitive to the underlying fundamental symmetries of quantum chromodynamics (QCD). In particular, the π0 decay width is primarily defined by the chiral anomaly, a fundamental symmetry breaking effect in QCD. Theoretical activities in this domain over the last years resulted in a high precision (1% level) prediction for the π0 decay width. The PrimEx collaboration at Jefferson Lab has developed and performed two new experiments to measure the π0 decay width with high precision using the Primakoff effect. The published result from the first experiment (PrimEx-I) was a factor of two more precise than the PDG accepted average value, and was in a good agreement with the chiral anomaly prediction. The second experiment (PrimEx-II) was performed in 2010 with a goal of 1.4% total uncertainty to address the next-to-leading-order chiral perturbation theory calculations. The final results from the PrimEx experiments will be presented and discussed in this talk. |
Sunday, April 14, 2019 11:33AM - 11:45AM |
H09.00005: Analysis of Radiative Decay of Eta Meson in CLAS Torri Jeske, Moskov Amaryan, Ilya Larin, Georgie Mbianda Njencheu The Light Meson Decay (LMD) program at CLAS was formed to analyze decays of light mesons produced in the photoproduction reaction $\gamma$p$\to$pX, where X = $\pi^0,\eta,\omega,\eta',$ and $\phi$. While the two photon decays of the light mesons are described by the triangle anomaly, we focus on the radiative decay of $\eta\to\pi^+\pi^-\gamma$ which proceeds from the less understood box anomaly. The data analyzed was taken during the g11a run period at Jefferson Lab. The decay photon energy distribution will be presented and compared to theory prediction. |
Sunday, April 14, 2019 11:45AM - 11:57AM |
H09.00006: Meson Photo-Production in {\Geant} for $E_\gamma =0.225-3.0$~GeV Using the $\gamma + p \rightarrow p + \pi ^0$ reaction Sokhna Bineta Amar, Oumar Ka, Paul L Gueye The purpose of this study is to compare experimental data and theoretical models implemented in version 9.6.p02 of the {\Geant} Monte Carlo simulation toolkit for the exclusive and differential cross sections of $\pi^0$ photo-production. The data from the Chiral Invariant Phase Space (CHIPS) and Bertini Cascade (BERT) models were compared to the experimental data from the CEBAF Large Acceptance Spectrometer (CLAS) of Jefferson Lab and the phenomenological Scattering Analysis Interactive Dial-in (SAID) model. Relativistic Breit-Wigner fits of the $\Delta(1232)$, N*(1520), N*(1650) and N*(1875) resonances give agreements to within 3\% for the mass of each resonance. BERT does not allow for an accurate description of the energy distribution. The angular distributions of the cross sections show significant differences between CHIPS and both CLAS and SAID. The physics in CHIPS appears to be correct but it needs further development for the individual resonances contributions that could be useful since it is also the only model able to treat electromagnetically induced meson production for $A>1$. |
Sunday, April 14, 2019 11:57AM - 12:09PM |
H09.00007: ω photoproduction in a coupled channel approach Shahab Razavi, Kanzo Nakayama The ω photoproduction off the proton is studied within a coupled channel approach which includes the γN, Nπ, Nη, Nω, Nσ, Nρ, and πΔ channels. The latter three channels effectively account for the Nππ channel. The analysis considers the currently available high-precision cross section as well as spin asymmetry data, especially from the CLAS Collaboration, including the newly reported double-polarization observables F, P, and H [P. Roy et al., arXiv:1812.02106].
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Sunday, April 14, 2019 12:09PM - 12:21PM |
H09.00008: ABSTRACT WITHDRAWN
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Sunday, April 14, 2019 12:21PM - 12:33PM |
H09.00009: Investigating the light exotic scalar hybrid meson (JPC = 0+-) using Gaussian QCD sum rules Jason Ho, Ryan Berg, Tom Steele, Wei Chen, Derek Harnett We present mass calculations for light (nonstrange and strange) quarkonium hybrid mesons with exotic quantum number JPC = 0+- utilizing a Gaussian QCD sum rule analysis. We consider single narrow, single wide, and double narrow hadronic resonance models, and through a model-independent analysis of the hadronic spectral function, we assess the possibility of distributed resonance strength. Finally, we explore the use of the Hölder inequality as a way to constrain the sum rule methodology. |
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