V. Crede

Determination of the Beam-Spin Asymmetry of Deuteron Photodisintegration in the Energy Region $E_{I^}^{3} = 1.1 - 2.3$ GeV

Nicholas Zachariou, Yordanka Ilieva, Nikolay Ya. Ivanov +140

The beam-spin asymmetry, $I^£$ , for the reaction $I^^{3} d \to p n$ has been measured using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelera…

Near Threshold Neutral Pion Electroproduction at High Momentum Transfers and Generalized Form Factors

P. Khetarpal, P. Stoler, I. G. Aznauryan +157

We report the measurement of near threshold neutral pion electroproduction cross sections and the extraction of the associated structure functions on the proton in the kinematic ra…

Differential cross sections for Î(1520) using photoproduction at CLAS

U. Shrestha, T. Chetry, C. Djalali +130

The reaction $I^^{3} p \to K^{+} I^ (1520)$ using photoproduction data from the CLAS $g 12$ experiment at Jefferson Lab is studied. The decay of $I^ (1520)$ into two exclusive chan…

Measurement of polarisation observables in $K_{s}^{0} I^£^{+}$ photoproduction off the proton

R. Ewald, A. V. Anisovich, B. Bantes +57

The reaction $I^^{3} p \to K_{S}^{0} I^£^{+}$ is studied in the photon energy range from threshold. Linearly polarised photon beams from coherent bremsstrahlung enabled the first m…

New data on $I^^{3} p \to I^\cdot p$ with polarized photons and protons and their implications for $N^{*} \to N I^\cdot$ decays

J. MÃ¼ller, J. Hartmann, M. GrÃ¼ner +86

The polarization observables $T, E, P, H$ , and $G$ in photoproduction of $I^\cdot$ mesons off protons are measured for photon energies from threshold to $W = 2400$ MeV ( $T$ ), 2280 MeV ($…

Measurement of Spin Density Matrix Elements in $I^ (1520)$ Photoproduction at 8.2-8.8 GeV

GlueX Collaboration, S. Adhikari, C. S. Akondi +143

We report on the measurement of spin density matrix elements of the $I^ (1520)$ in the photoproduction reaction $I^^{3} p \to I^ (1520) K^{+}$ , via its subsequent decay to $K^{-} p$ . T…

Beam-Recoil Transferred Polarization in $K^{+} Y$ Electroproduction in the Nucleon Resonance Region with CLAS12

D. S. Carman, A. D'Angelo, L. Lanza +138

Beam-recoil transferred polarizations for the exclusive electroproduction of $K^{+} I^$ and $K^{+} I^£^{0}$ final states from an unpolarized proton target have been measured using the CLAS1…

Photoproduction of $I ¨ $ mesons on nuclei near the production threshold

M. Nanova, J. Weil, S. Friedrich +67

The photoproduction of $I ¨ $ mesons on LH_2, C and Nb has been studied for incident photon energies from 900 to 1300 MeV using the CB/TAPS detector at ELSA. The $I ¨ $ line shape does…

Anomaly in the K^0_S Sigma^+ photoproduction cross section off the proton at the K* threshold

R. Ewald, A. V. Anisovich, B. Bantes +57

The $I^^{3} + p \to K^{0} + I^£^{+}$ photoproduction reaction is investigated in the energy region from threshold to $E_{I^}^{3} = 2250$ \,MeV. The differential cross section exhibits increa…

hep-ex2022

Multidimensional, high precision measurements of beam single spin asymmetries in semi-inclusive $I ¨ ^{+}$ electroproduction off protons in the valence region

S. Diehl, A. Kim, G. Angelini +153

High precision measurements of the polarized electron beam-spin asymmetry in semi-inclusive deep inelastic scattering (SIDIS) from the proton have been performed using a 10.6~GeV i…

hep-ex2025

Multidimensional Measurements of Beam Single Spin Asymmetries in Semi-inclusive Deep-inelastic Charged Kaon Electroproduction off Protons in the Valence Region

A. Kripko, S. Diehl, K. Joo +136

Measurements of beam single spin asymmetries in semi-inclusive deep inelastic electron scattering (SIDIS) with positively charged kaons off protons have been performed with 10.6 an…

Beam Asymmetry $I^£$ for the Photoproduction of $I^\cdot$ and $I^\cdot^{'}$ Mesons at $E_{I^}^{3} = 8.8$ GeV

The GlueX Collaboration, S. Adhikari, A. Ali +131

We report on the measurement of the beam asymmetry $I^£$ for the reactions $I^^{3} p \to p I^\cdot$ and $I^^{3} p \to p I^\cdot^{'}$ from the GlueX experiment, using an 8.2--8…

physics.ins-det2014

A study of decays to strange final states with GlueX in Hall D using components of the BaBar DIRC

The GlueX Collaboration, M. Dugger, B. Ritchie +103

We propose to enhance the kaon identification capabilities of the GlueX detector by constructing an FDIRC (Focusing Detection of Internally Reflected Cherenkov) detector utilizing…

Demonstration of a novel technique to measure two-photon exchange effects in elastic $e^{\pm} p$ scattering

M. Moteabbed, M. Niroula, B. A. Raue +147

The discrepancy between proton electromagnetic form factors extracted using unpolarized and polarized scattering data is believed to be a consequence of two-photon exchange (TPE) e…

Target and Double Spin Asymmetries of Deeply Virtual $I ¨ ^{0}$ Production with a Longitudinally Polarized Proton Target and CLAS

A. Kim, H. Avakian, V. Burkert +126

The target and double spin asymmetries of the exclusive pseudoscalar channel $e p \to e p I ¨ ^{0}$ were measured for the first time in the deep-inelastic regime using a longitud…

nucl-ex2024

Measurement of Spin-Density Matrix Elements in $I^^{++} (1232)$ photoproduction

F. Afzal, C. S. Akondi, M. Albrecht +146

We measure the spin-density matrix elements (SDMEs) of the $I^^{++} (1232)$ in the photoproduction reaction $I^^{3} p \to I ¨ ^{-} I^^{++} (1232)$ with the GlueX experiment in Hall D at Jeffer…

nucl-ex2020

Photoproduction of $I^\cdot$ mesons off the proton for $1.2 < E_{I^}^{3} < 4.7$ GeV using CLAS at Jefferson Laboratory

T. Hu, Z. Akbar, V. Crede +148

Photoproduction cross sections are reported for the reaction $I^^{3} p \to p I^\cdot$ using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The $I^\cdot$ mesons are detecte…

nucl-ex2026

Measurement of the nucleon spin structure functions for 0.01< $Q^{2}$ <1 GeV $^{2}$ using CLAS

A. Deur, S. E. Kuhn, M. Ripani +147

The spin structure functions of the proton and the deuteron were measured during the EG4 experiment at Jefferson Lab in 2006. Data were collected for longitudinally polarized elect…

Photon beam asymmetry $I^£$ for $I^\cdot$ and $I^\cdot^{'}$ photoproduction from the proton

P. Collins, B. G. Ritchie, M. Dugger +140

Measurements of the linearly-polarized photon beam asymmetry $I^£$ for photoproduction from the proton of $I^\cdot$ and $I^\cdot^{'}$ mesons are reported. A linearly-polarized tagged photo…

nucl-ex2021

Measurement of beam asymmetry for $I ¨ ^{-} I^^{++}$ photoproduction on the proton at $E_{I^}^{3}$ =8.5 GeV

GlueX Collaboration, S. Adhikari, C. S. Akondi +134

We report a measurement of the $I ¨ ^{-}$ photoproduction beam asymmetry for the reaction $I^^{3} p \to I ¨ ^{-} I^^{++}$ using data from the GlueX experiment in the photon beam en…

Measurement of the neutron F2 structure function via spectator tagging with CLAS

N. Baillie, S. Tkachenko, J. Zhang +147

We report on the first measurement of the F2 structure function of the neutron from semi-inclusive scattering of electrons from deuterium, with low-momentum protons detected in the…

Hard Two-body Photodisintegration of 3He

I. Pomerantz, Y. Ilieva, R. Gilman +197

We have measured cross sections for the gamma+3He->p+d reaction at photon energies of 0.4 - 1.4 GeV and a center-of-mass angle of 90 deg. We observe dimensional scaling above 0.7 G…

Photoproduction of eta mesons from the neutron: cross sections and double polarization observable E

L. Witthauer, M. Dieterle, F. Afzal +70

Photoproduction of $I^\cdot$ mesons from neutrons} \abstract{Results from measurements of the photoproduction of $I^\cdot$ mesons from quasifree protons and neutrons are summarized. The expe…

Induced polarization of Î(1116) in kaon electroproduction

M. Gabrielyan, B. A. Raue, D. S. Carman +132

We have measured the induced polarization of the $I^ (1116)$ in the reaction $e p \to e^{'} K^{+} I^$ , detecting the scattered $e^{'}$ and $K^{+}$ in the final state along with the proton…

Measurement of Beam-Recoil Observables $C_{x}$ and $C_{z}$ for $K^{+} I^$ Photoproduction

CLAS Collaboration, S. Adhikari, B. A. Raue +154

Exclusive photoproduction of $K^{+} I^$ final states off a proton target has been an important component in the search for missing nucleon resonances and our understanding of the pro…

PANDA Phase One

G. Barucca, F. DavÃ¬, G. Lancioni +421

The Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, provides unique possibilities for a new generation of hadron-, nuclear- and atomic physics experiments. T…

First measurement of near-threshold J/ $I ¨ $ exclusive photoproduction off the proton

The GlueX Collaboration, A. Ali, M. Amaryan +132

We report on the measurement of the $I^^{3} p \to J / I ¨ p$ cross section from $E_{I^}^{3} = 11.8$ GeV down to the threshold at $8.2$ GeV using a tagged photon beam with the GlueX experim…

Photoproduction of Neutral Pions off Protons

TAPS Collaboration, V. Crede, N. Sparks +59

Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector in the reaction $I^^{3} p \to p I ¨ ^{0}$ for photon energies between 0.85 and 2.50 GeV. The $I ¨ ^{0}$ mesons are…

Measurement of the Beam Asymmetry $I^£$ in the Forward Direction for pi0 Photoproduction

N. Sparks, V. Crede, A. V. Anisovich +57

Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector for photon energies between 0.92 and 1.68~GeV at the electron accelerator ELSA. The beam asymmetry~$…

nucl-ex2024

Photoproduction of two charged pions off protons in the resonance region

A. V. Sarantsev, E. Klempt, K. V. Nikonov +4

Photoproduction of charged pions pairs off protons is studied within the invariant masses of the final state hadrons from 1.6 to 2.4 GeV at the Thomas Jefferson National Accelerato…

Target and beam-target spin asymmetries in exclusive pion electroproduction for $Q^{2} > 1$ GeV $^{2}$ . II. $e p \to e I ¨ ^{0} p$

P. E. Bosted, A. Kim, K. P. Adhikari +152

Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive $I ¨ ^{0}$ electroproduction reaction $Î³^* p \to p Ï^0$, expanding an analysis…

Photoproduction of meson pairs: First measurement of the polarization observable I^s

E. Gutz, V. Sokhoyan, H. van Pee +64

The polarization observable I^s, a feature exclusive to the acoplanar kinematics of multi-meson final states produced via linearly polarized photons, has been measured for the firs…

physics.ins-det2020

The GlueX Beamline and Detector

S. Adhikari, C. S. Akondi, H. Al Ghoul +187

The GlueX experiment at Jefferson Lab has been designed to study photoproduction reactions with a 9-GeV linearly polarized photon beam. The energy and arrival time of beam photons…

Determination of the real part of the Î·'-Nb optical potential

M. Nanova, S. Friedrich, V. Metag +51

The excitation function and momentum distribution of Î·' mesons have been measured in photoproduction off 93^Nb in the energy range of 1.2-2.9 GeV. The experiment has been performe…

High statistics study of the reaction $I^^{3} p \to p 2 I ¨ ^{0}$

V. Sokhoyan, E. Gutz, V. Crede +62

The photoproduction of 2 $I ¨ ^{0}$ mesons off protons was studied with the Crystal Barrel/TAPS experiment at the electron accelerator ELSA in Bonn. The energy of photons produced in a…

hep-ph2023

Note on the definitions of branching ratios of overlapping resonances

V. Burkert, V. Crede, E. Klempt +8

Branching ratios for the decay of hadrons with large width or near thresholds depend on their definition. We test different definitions and show that rather different branching rat…

First measurement of the helicity asymmetry for $I^^{3} p \to p I ¨ ^{0}$ in the resonance region

M. Gottschall, A. V. Anisovich, B. Bantes +64

The first measurement of the helicity dependence of the photoproduction cross section of single neutral pions off protons is reported for photon energies from 600 to 2300\,MeV, cov…

Exploring the Structure of the Bound Proton with Deeply Virtual Compton Scattering

M. Hattawy, N. A. Baltzell, R. DuprÃ© +125

In the past two decades, deeply virtual Compton scattering of electrons has been successfully used to advance our knowledge of the partonic structure of the free proton and investi…

Differential Cross Section Measurements for $I^^{3} n \to I ¨ ^{-} p$ Above the First Nucleon Resonance Region

P. T. Mattione, D. S. Carman, I. I. Strakovsky +145

The quasi-free $I^^{3} d \to I ¨ ^{-} p (p)$ differential cross section has been measured with CLAS at photon beam energies $E_{I^}^{3}$ from 0.445 GeV to 2.510 GeV (corresponding to $W$ from 1.311…

Well-established nucleon resonances revisited by double-polarization measurements

A. Thiel, A. V. Anisovich, D. Bayadilov +64

The first measurement is reported of the double-polarization observable G in photoproduction of neutral pions off protons, covering the photon energy range from 620 to 1120 MeV and…

An initial study of mesons and baryons containing strange quarks with GlueX

The GlueX Collaboration, A. AlekSejevs, S. Barkanova +97

The primary motivation of the GlueX experiment is to search for and ultimately study the pattern of gluonic excitations in the meson spectrum produced in $I^^{3} p$ collisions. Recent l…

hep-ex2011

Precise Measurements of Beam Spin Asymmetries in Semi-Inclusive $I ¨ ^{0}$ production

M. Aghasyan, H. Avakian, P. Rossi +151

We present studies of single-spin asymmetries for neutral pion electroproduction in semi-inclusive deep-inelastic scattering of 5.776 GeV polarized electrons from an unpolarized hy…

Measurement of the beam asymmetry $I^£$ and the target asymmetry $T$ in the photoproduction of $I ¨ $ mesons off the proton using CLAS at Jefferson Laboratory

P. Roy, Z. Akbar, S. Park +143

The photoproduction of $I ¨ $ mesons off the proton has been studied in the reaction $I^^{3} p \to p I ¨ $ using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target (F…

Target and Beam-Target Spin Asymmetries in Exclusive Pion Electroproduction for $Q^{2} > 1$ GeV $^{2}$ . I. $e p \to e I ¨ ^{+} n$

P. E. Bosted, M. J. Amaryan, S. Anefalos Pereira +115

Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive $I ¨ ^{+}$ electroproduction reaction $Î³^* p \to n Ï^+$. The results were obtai…

Measurement of the Q^2 Dependence of the Deuteron Spin Structure Function g_1 and its Moments at Low Q^2 with CLAS

K. P. Adhikari, A. Deur, L. El Fassi +145

We measured the $g_{1}$ spin structure function of the deuteron at low $Q^{2}$ , where QCD can be approximated with chiral perturbation theory ( $I ¨ $ PT). The data cover the resonance r…

Improved $I^ p$ Elastic Scattering Cross Sections Between 0.9 and 2.0 GeV/c and Connections to the Neutron Star Equation of State

CLAS Collaboration, J. Rowley, N. Compton +143

Strange matter is believed to exist in the cores of neutron stars based on simple kinematics. If this is true, then hyperon-nucleon interactions will play a significant part in the…

First results on nucleon resonance photocouplings from the $I^^{3} p \to I ¨ ^{+} I ¨ ^{-} p$ reaction

CLAS Collaboration, E. Golovatch, V. D. Burkert +127

We report the first experimental measurements of the nine 1-fold differential cross sections for the $I^^{3} p \to I ¨ ^{+} I ¨ ^{-} p$ reaction, obtained with the CLAS detector at Jefferson Labo…

Exclusive $I^\cdot$ electroproduction at $W > 2$ GeV with CLAS and transversity generalized parton distributions

CLAS Collaboration, I. Bedlinskiy, V. Kubarovsky +144

The cross section of the exclusive $I^\cdot$ electroproduction reaction $e p \to e^{'} p^{'} I^\cdot$ was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. D…

The Î·'-carbon potential at low meson momenta

M. Nanova, S. Friedrich, V. Metag +58

The production of $I^\cdot^{'}$ mesons in coincidence with forward-going protons has been studied in photon-induced reactions on $^{12}$ C and on a liquid hydrogen (LH $_{2}$ ) target for…

Photoproduction of $I^\cdot^{'}$ -mesons off the deuteron

I. Jaegle, T. Mertens, A. Fix +62

Quasi-free photoproduction of $I^\cdot^{'}$ mesons off nucleons bound in the deuteron has been measured with the combined Crystal Barrel - TAPS detector. The experiment was done at a tagge…

hep-ex2015

A search for baryon- and lepton-number violating decays of $I^$ hyperons using the CLAS detector at Jefferson Laboratory

M. E. McCracken, M. Bellis, K. P. Adhikari +128

We present a search for ten baryon-number violating decay modes of $I^$ hyperons using the CLAS detector at Jefferson Laboratory. Nine of these decay modes result in a single meson…

nucl-ex2026

Measurements of $I^_{v}^{3} p \to I ¨ ^{+} I ¨ ^{-} p^{'}$ Cross Sections with the CLAS Detector for $Q^{2}$ from 2.0--5.0~GeV $^{2}$ and $W$ from 1.400--2.125~GeV

A. Trivedi, R. W. Gothe, E. Phelps +122

Observables in the electroproduction of the $I ¨ ^{+} I ¨ ^{-} p$ reaction channel off the proton that are sensitive to the polarization of the virtual photon are presented for the first tim…

Quasi-free photoproduction of eta-mesons of the neutron

I. Jaegle, T. Mertens, A. V. Anisovich +69

Quasi-free photoproduction of eta-mesons off nucleons bound in the deuteron has been measured with the CBELSA/TAPS detector for incident photon energies up to 2.5 GeV at the Bonn E…

Measurement of the structure function of the nearly free neutron using spectator tagging in inelastic $^{2}$ H(e, e'p)X scattering with CLAS

S. Tkachenko, N. Baillie, S. E. Kuhn +148

Much less is known about neutron structure than that of the proton due to the absence of free neutron targets. Neutron information is usually extracted from data on nuclear targets…

Photon beam asymmetry $I^£$ in the reaction $I^^{3} p \to p I ¨ $ for $E_{I^}^{3}$ = 1.152 to 1.876 GeV

CLAS Collaboration, P. Collins, B. G. Ritchie +147

Photon beam asymmetry $I^£$ measurements for $I ¨ $ photoproduction in the reaction $I^^{3} p \to I ¨ p$ are reported for photon energies from 1.152 to 1.876 GeV. Data were taken using…

Double-polarization observable G in neutral-pion photoproduction off the proton

A. Thiel, H. Eberhardt, M. Lang +69

This paper reports on a measurement of the double-polarization observable G in $I ¨ ^{0}$ photoproduction off the proton using the CBELSA/TAPS experiment at the ELSA accelerator in Bon…

nucl-ex2024

Measurement of the J/ $I ¨ $ photoproduction cross section over the full near-threshold kinematic region

GlueX Collaboration, S. Adhikari, F. Afzal +150

We report the total and differential cross sections for $J / I ¨ $ photoproduction with the large acceptance GlueX spectrometer for photon beam energies from the threshold at 8.2~GeV u…

Quasi-free photoproduction of eta-mesons off the deuteron

I. Jaegle, B. Krusche, A. V. Anisovich +69

Precise data for quasi-free photoproduction of $I^\cdot$ mesons off the deuteron have been measured at the Bonn ELSA accelerator with the combined Crystal Barrel/TAPS detector for incid…

Observation of Beam Spin Asymmetries in the Process $e p \to e I ¨ ^{+} I ¨ ^{-} X$ with CLAS12

T. B. Hayward, C. Dilks, A. Vossen +140

The observation of beam spin asymmetries in two-pion production in semi-inclusive deep inelastic scattering off an unpolarized proton target is reported. The data presented here we…

Measurement of single- and double-polarization observables in the photoproduction of $I ¨ ^{+} I ¨ ^{-}$ ~meson pairs off the proton using CLAS at Jefferson Laboratory

P. Roy, S. Cao, V. Crede +141

The photoproduction of $I ¨ ^{+} I ¨ ^{-}$ meson pairs off the proton has been studied in the reaction $I^^{3} p \to p I ¨ ^{+} I ¨ ^{-}$ using the CEBAF Large Acceptance Spectrometer (CLAS) and the froz…

nucl-ex2020

Extraction of beam-spin asymmetries from the hard exclusive $I ¨ ^{+}$ channel off protons in a wide range of kinematics

S. Diehl, K. Joo, A. Kim +135

We have measured beam-spin asymmetries to extract the $sin I ¨ $ moment $A_{LU}^{s i n I ¨ }$ from the hard exclusive $e p \to e^{'} n I ¨ ^{+}$ reaction above the resonance region,…

First Exclusive Measurement of Deeply Virtual Compton Scattering off $^{4}$ He: Toward the 3D Tomography of Nuclei

M. Hattawy, N. A. Baltzell, R. DuprÃ© +157

We report on the first measurement of the beam-spin asymmetry in the exclusive process of coherent deeply virtual Compton scattering off a nucleus. The experiment used the 6 GeV el…

hep-ex2012

Measurement of Exclusive $I ¨ ^{0}$ Electroproduction Structure Functions and their Relationship to Transversity GPDs

CLAS Collaboration, I. Bedlinskiy, V. Kubarovsky +151

Exclusive $I ¨ ^{0}$ electroproduction at a beam energy of 5.75 GeV has been measured with the Jefferson Lab CLAS spectrometer. Differential cross sections were measured at more than 1…

hep-ex2012

A study of meson and baryon decays to strange final states with GlueX in Hall D (A proposal to the 39th Jefferson Lab Program Advisory Committee)

The GlueX Collaboration, M. Dugger, B. Ritchie +76

The primary motivation of the GlueX experiment is to search for and ultimately study the pattern of gluonic excitations in the meson spectrum produced in gamma p collisions. Recent…

First-time measurement of Timelike Compton Scattering

P. Chatagnon, S. Niccolai, S. Stepanyan +146

We present the first measurement of the Timelike Compton Scattering process, $Î³p\to p^\prime Î³^* (Î³^*\to e^+e^-) $, obtained with the CLAS12 detector at Jefferson Lab. The photo…

Measurement of double polarisation asymmetries in $I ¨ $ -photoproduction

H. Eberhardt, T. C. Jude, H. Schmieden +72

The first measurements of the beam-target-helicity-asymmetries $E$ and $G$ in the photoproduction of $I ¨ $ -mesons off protons at the CBELSA/TAPS experiment are reported. $E$ ( $G$ ) w…

Measurement of the Total Compton Scattering Cross Section between 6.5 and 11 GeV

GlueX Collaboration, F. Afzal, C. S. Akondi +148

The total cross section for Compton scattering off atomic electrons, $Î³+e\rightarrowÎ³'+e'$, was measured using photons with energies between 6.5 and 11.1 GeV incident on a $^{9}$ Be…

Deep exclusive $I ¨ ^{+}$ electroproduction off the proton at CLAS

K. Park, M. Guidal, R. W. Gothe +153

The exclusive electroproduction of $I ¨ ^{+}$ above the resonance region was studied using the $CEBAF$ Large Acceptance Spectrometer ( $CLAS$ ) at Jefferson Laboratory by scatt…

Exclusive $I ¨ ^{0}$ electroproduction at $W > 2$ GeV with CLAS

I. Bedlinskiy, V. Kubarovsky, S. Niccolai +143

Exclusive neutral-pion electroproduction ( $e p \to e^{'} p^{'} I ¨ ^{0}$ ) was measured at Jefferson Lab with a 5.75-GeV electron beam and the CLAS detector. Differential cross sect…

Transverse Polarization of $I^£^{+} (1189)$ in Photoproduction on a Hydrogen Target in CLAS

C. S. Nepali, M. Amaryan, K. P. Adhikari +143

Experimental results on the $I^£^{+} (1189)$ hyperon transverse polarization in photoproduction on a hydrogen target using the CLAS detector at Jefferson laboratory are presented. The…

hep-ex2009

The Experimental Status of Glueballs

V. Crede, C. A. Meyer

Glueballs and other resonances with large gluonic components are predicted as bound states by Quantum Chromodynamics (QCD). The lightest (scalar) glueball is estimated to have a ma…

Modification of the $I ¨ $ -Meson Lifetime in Nuclear Matter

M. Kotulla, D. Trnka, P. MÃ¼hlich +65

The photo production of $I ¨ $ mesons on the nuclei C, Ca, Nb and Pb has been measured using the Crystal Barrel/TAPS detector at the ELSA tagged photon facility in Bonn. The dependen…

nucl-ex2023

Beam Spin Asymmetry Measurements of Deeply Virtual $I ¨ ^{0}$ Production with CLAS12

A. Kim, S. Diehl, K. Joo +154

The new experimental measurements of beam spin asymmetry were performed for the deeply virtual exclusive $I ¨ ^{0}$ production in a wide kinematic region with the photon virtualities $…

hep-ph2017

Workshop on Excited Hyperons in QCD Thermodynamics at Freeze-Out (YSTAR2016) Mini-Proceedings

P. Alba, M. Amaryan, V. Begun +38

This Workshop brought top experts, researchers, postdocs, and students from high-energy heavy ion interactions, lattice QCD and hadronic physics communities together. YSTAR2016 dis…

Measurement of Target and Double-spin Asymmetries for the $e p \to e I ¨ ^{+} (n)$ Reaction in the Nucleon Resonance Region at Low $Q^{2}$

X. Zheng, K. P. Adhikari, P. Bosted +147

We report measurements of target- and double-spin asymmetries for the exclusive channel $e p \to e I ¨ ^{+} (n)$ in the nucleon resonance region at Jefferson Lab using the CEBAF…

Tensor Correlations Measured in 3He(e,e'pp)n

H. Baghdasaryan, L. B. Weinstein, J. M. Laget +124

We have measured the 3He(e,e'pp)n reaction at an incident energy of 4.7 GeV over a wide kinematic range. We identified spectator correlated pp and pn nucleon pairs using kinematic…

Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in pi^0-photoproduction off the proton

D. Elsner, B. Bantes, O. Bartholomy +55

At the electron accelerator ELSA a linearly polarised tagged photon beam is produced by coherent bremsstrahlung off a diamond crystal. Orientation and energy range of the linear po…

hep-ex2020

Beam spin asymmetry in semi-inclusive electroproduction of a hadron pair

M. Mirazita, H. Avakian, A. Courtoy +140

A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU is a higher-twist observable and…

First measurement of the helicity asymmetry $E$ in $I^\cdot$ photoproduction on the proton

I. Senderovich, B. T. Morrison, M. Dugger +148

Results are presented for the first measurement of the double-polarization helicity asymmetry E for the $I^\cdot$ photoproduction reaction $I^^{3} p \to I^\cdot p$ . Data were obtained usin…

Beam-Target Helicity Asymmetry $E$ in $K^{0} I^$ and $K^{0} I^£^{0}$ Photoproduction on the Neutron

CLAS Collaboration, D. H. Ho, R. A. Schumacher +146

We report the first measurements of the $E$ beam-target helicity asymmetry for the $I^^{3} n \to K^{0} I^$ , and $K^{0} I^£^{0}$ channels in the energy range 1.70 $\leq W \leq$ 2.34…

Precise Determination of the Deuteron Spin Structure at Low to Moderate $Q^{2}$ with CLAS and Extraction of the Neutron Contribution

N. Guler, R. G. Fersch, S. E. Kuhn +126

We present the final results for the deuteron spin structure functions obtained from the full data set collected with Jefferson Lab's CLAS in 2000-2001. Polarized electrons with en…

hep-ex2022

Search for photoproduction of axion-like particles at GlueX

GlueX Collaboration, S. Adhikari, C. S. Akondi +142

We present a search for axion-like particles, $a$ , produced in photon-proton collisions at a center-of-mass energy of approximately 4 GeV, focusing on the scenario where the $a$ -gl…

Precision measurements of $g_{1}$ of the proton and the deuteron with 6 GeV electrons

Y. Prok, P. Bosted, N. Kvaltine +160

The inclusive polarized structure functions of the proton and deuteron, g1p and g1d, were measured with high statistical precision using polarized 6 GeV electrons incident on a pol…

nucl-th2025

Decays of $N^{}$ and $I^^{}$ resonances into $N I ¨ $ , $I^ I ¨ $ , and $N I ¨ $

A. V. Sarantsev, E. Klempt, K. V. Nikonov +7

The decays of $N^{*}$ and $I^^{*}$ resonances into $N I ¨ $ , $I^ I ¨ $ and $N I ¨ $ final states are studied in a coupled-channel analysis of data on pion- and photo-induced reactions. Improvem…

Target and Beam-Target Spin Asymmetries in Exclusive $I ¨ ^{+}$ and $I ¨ ^{-}$ Electroproduction with 1.6 to 5.7 GeV Electrons

P. E. Bosted, A. S. Biselli, S. Careccia +159

Beam-target double spin asymmetries and target single-spin asymmetries in exclusive $I ¨ ^{+}$ and $I ¨ ^{-}$ electroproduction were obtained from scattering of 1.6 to 5.7 GeV longitudinal…

nucl-ex2020

Measurement of the Photon Beam Asymmetry in $I^^{3} p \to K^{+} I^£^{0}$ at $E_{I^}^{3} = 8.5$ GeV

The GlueX Collaboration, S. Adhikari, A. Ali +124

We report measurements of the photon beam asymmetry $I^£$ for the reaction $I^^{3} p \to K^{+} I^£^{0}$ (1193) using the GlueX spectrometer in Hall D at Jefferson Lab. Data were collected u…

Semi-Inclusive $I ¨ _{0}$ target and beam-target asymmetries from 6 GeV electron scattering with CLAS

S. Jawalkar, S. Koirala, H. Avakian +160

We present precision measurements of the target and beam-target spin asymmetries from neutral pion electroproduction in deep-inelastic scattering (DIS) using the CEBAF Large Accept…

Near-threshold Photoproduction of Phi Mesons from Deuterium

X. Qian, W. Chen, H. Gao +144

We report the first measurement of the differential cross section on $I ¨ $ -meson photoproduction from deuterium near the production threshold for a proton using the CLAS detector an…

The polarization observables T, P, and H and their impact on $I^^{3} p \to p I ¨ ^{0}$ multipoles

J. Hartmann, H. Dutz, A. V. Anisovich +76

Data on the polarization observables T, P, and H for the reaction $I^^{3} p \to p I ¨ ^{0}$ are reported. Compared to earlier data from other experiments, our data are more precise and extend…

Evidence for the Onset of Color Transparency in $I ¨ ^{0}$ Electroproduction off Nuclei

L. El Fassi, L. Zana, K. Hafidi +154

We have measured the nuclear transparency of the incoherent diffractive $A (e, e^{'} I ¨ ^{0})$ process in $^{12}$ C and $^{56}$ Fe targets relative to $^{2}$ H using a 5 GeV electron beam. The n…

In-medium $I ¨ $ mass from the $I^^{3} + N b \to I ¨ ^{0} I^^{3} + X$ reaction

TAPS Collaboration, M. Nanova, V. Metag +65

Data on the photoproduction of $I ¨ $ mesons on nuclei have been re-analyzed in a search for in-medium modifications. The data were taken with the Crystal Barrel(CB)/TAPS detector sy…

First Measurement of $a_{2}^{0} (1320)$ Polarized Photoproduction Cross Section

GlueX Collaboration, F. Afzal, C. S. Akondi +149

We measure for the first time the differential photoproduction cross section $d I ¨ / d t$ of the $a_{2} (1320)$ meson at an average photon beam energy of 8.5~GeV, using data with an integ…

First Results from The GlueX Experiment

The GlueX Collaboration, H. Al Ghoul, E. G. Anassontzis +108

The GlueX experiment at Jefferson Lab ran with its first commissioning beam in late 2014 and the spring of 2015. Data were collected on both plastic and liquid hydrogen targets, an…

Photoproduction of eta-mesons off nuclei for Eg < 2.2 GeV

T. Mertens, I. Jaegle, P. Muehlich +69

Photoproduction of $I^\cdot$ mesons off $^{12}$ C, $^{40}$ Ca, $^{93}$ Nb, and $^{na t}$ Pb nuclei has been measured with a tagged photon beam with energies between 0.6 and 2.2 GeV. The expe…

$N^{*}$ decays to $N I ¨ $ from new data on $I^^{3} p \to I ¨ p$

I. Denisenko, A. V. Anisovich, V. Crede +7

Data on the reaction $I^^{3} p \to I ¨ p$ with $I ¨ \to I ¨ ^{0} I^^{3}$ , taken with unpolarized or polarized beams in combination with an unpolarized or polarized proton-target, were analyzed within…

hep-ex2026

Hadron Physics Opportunities at FAIR

J. G. Messchendorp, F. Nerling, P. Achenbach +103

This White Paper outlines a coordinated, decade-spanning programme of hadron and QCD studies anchored at the GSI/FAIR accelerator complex. Profiting from intense deuteron, proton a…

The N(1520) 3/2- helicity amplitudes from an energy-independent multipole analysis based on new polarization data on photoproduction of neutral pions

J. Hartmann, H. Dutz, A. V. Anisovich +74

New data on the polarization observables T, P, and H for the reaction $I^^{3} p \to p I ¨ ^{0}$ are reported. The results are extracted from azimuthal asymmetries when a transversely polariz…

Measurement of the proton spin structure at long distances

X. Zheng, A. Deur, H. Kang +148

Measuring the spin structure of protons and neutrons tests our understanding of how they arise from quarks and gluons, the fundamental building blocks of nuclear matter. At long di…

Transparency ratio in Î³A -> Î·' A' and the in-medium Î·' width

M. Nanova, V. Metag, A. Ramos +58

The photoproduction of Î·'-mesons off different nuclei has been measured with the CBELSA/TAPS detector system for incident photon energies between 1500 - 2200 MeV. The transparency…