V. Kakoyan

activity

20142026

most citedFirst measurement of near-threshold J/

ψ

exclusive photoproduction off the proton

205 citations · 512 across the 30 of their papers we have counts for

collaborators

30 papers

physics.ins-det2026

Compact sub-10 ps Resolution Radio Frequency Photomultiplier Tube

Sergey Abrahamyan, Simon Zhamkochyan, Hasmik Rostomyan +16

Experimental measurements of the radial spreading of photoelectrons emitted from a multi-alkali photocathode in a MCP-based photomultiplier tube have shown that, for photon wavelen…

physics.ins-det2026

A Helical-Deflector-Based Radio-Frequency Spiral Scanning System for keV Energy Electrons

Simon Zhamkochyan, Vanik Kakoyan, Vardan Bardakhchyan +21

We present the design, modeling, and experimental validation of a radio-frequency based time-to-position conversion system for keV electrons incorporating a helical deflector opera…

hep-ex2025

Search for the $Y (2175)$ in the photoproduction cross section measurement of $γ p \to ϕ π^{+} π^{-} p$ at GlueX

GlueX Collaboration

Based on 334 pb $^{- 1}$ of photoproduction data collected with the GlueX detector at Jefferson Lab, we have measured for the first time the cross section of the exclusive reaction $…

nucl-ex2025

Threshold $J / ψ$ Photoproduction as a Probe of Nuclear Gluon Structure

J. R. Pybus, D. Dutta, H. Gao +83

The nuclear EMC effect is the observation that quark distributions in bound nucleons experience significant modification at large $x$ relative to free nucleons. Despite decades of…

hep-ex2025

Baryon-antibaryon photoproduction cross sections off the proton

GlueX Collaboration, F. Afzal, M. Albrecht +137

The GlueX experiment at Jefferson Lab has observed $p p ˉ$ and, for the first time, $Λ Λ ˉ$ and $p Λ ˉ$ photoproduction from a proton target at photon energies up to 11.6 GeV.…

physics.ins-det2025

Picosecond Precision Heavy-Ion Detector for Λ Hypernuclei Lifetime Studies

Simon Zhamkochyan, Sergey Abrahamyan, Amur Margaryan +18

In this paper, we present the design and preliminary performance evaluation of a new heavy-ion detector for direct measurements of heavy Λ hypernuclei lifetime. The detector employ…

physics.ins-det2025

Picosecond resolution photoelectron emission lifetime detection system

V. Kakoyan, S. Zhamkochyan, S. Abrahamyan +21

This paper describes a new photoelectron emission lifetime detection system. It is based on a recently developed Radio Frequency Timing technique of keV electrons and a 40 MHz, ult…

nucl-ex2025

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, $γ + e \to γ^{'} + e^{'}$ , was measured using photons with energies between 6.5 and 11.1 GeV incident on a $^{9}$ Be t…

nucl-ex2025

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 $d σ / d t$ of the $a_{2} (1320)$ meson at an average photon beam energy of 8.5~GeV, using data with an integr…

nucl-ex2024★ 5 cited

First Measurement of Near- and Sub-Threshold $J / ψ$ Photoproduction off Nuclei

J. R. Pybus, L. Ehinger, T. Kolar +65

We report on the first measurement of $J / ψ$ photoproduction from nuclei in the photon energy range of $7$ to $10.8$ GeV, extending above and below the photoproduction threshold in…

nucl-ex2024

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

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

We measure the spin-density matrix elements (SDMEs) of the $Δ^{++} (1232)$ in the photoproduction reaction $γ p \to π^{-} Δ^{++} (1232)$ with the GlueX experiment in Hall D at Jefferson…

nucl-ex2024★ 6 cited

Upper Limit on the Photoproduction Cross Section of the Spin-Exotic $π_{1} (1600)$

GlueX Collaboration, F. Afzal, C. S. Akondi +147

The spin-exotic hybrid meson $π_{1} (1600)$ is predicted to have a large decay rate to the $ω π π$ final state. Using 76.6~pb $^{- 1}$ of data collected with the GlueX detector, we meas…

nucl-ex2023★ 16 cited

Measurement of Spin-Density Matrix Elements in $ρ (770)$ Production with a Linearly Polarized Photon Beam at $E_{γ} = 8.2 - 8.8 GeV$

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

The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized $8.5 GeV$ photons impinging on a hydrogen target which is contained within…

nucl-ex2023★ 69 cited

Measurement of the J/ $ψ$ 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 $J / ψ$ photoproduction with the large acceptance GlueX spectrometer for photon beam energies from the threshold at 8.2~GeV up…

physics.ins-det2022

Advanced Radio Frequency Timing AppaRATus (ARARAT) Technique and Applications

Ani Aprahamian, Amur Margaryan, Vanik Kakoyan +28

The development of the advanced Radio Frequency Timer of electrons is described. It is based on a helical deflector, which performs circular or elliptical sweeps of keV electrons,…

physics.ins-det2022

An RF Timer of Electrons and Photons with the Potential to reach Picosecond Precision

Amur Margaryan, Vanik Kakoyan, Simon Zhamkochyan +17

This paper describes a new radio frequency timer of keV energy electrons. It is based on a helical deflector, which performs circular or elliptical sweeps of keV electrons, by mean…

hep-ex2021★ 12 cited

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…

nucl-ex2021★ 7 cited

Measurement of Spin Density Matrix Elements in $Λ (1520)$ 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 $Λ (1520)$ in the photoproduction reaction $γ p \to Λ (1520) K^{+}$ , via its subsequent decay to $K^{-} p$ . The…

nucl-ex2020★ 9 cited

Measurement of beam asymmetry for $π^{-} Δ^{++}$ photoproduction on the proton at $E_{γ}$ =8.5 GeV

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

We report a measurement of the $π^{-}$ photoproduction beam asymmetry for the reaction $γ p \to π^{-} Δ^{++}$ using data from the GlueX experiment in the photon beam energy…

nucl-ex2020★ 17 cited

Strange Hadron Spectroscopy with Secondary KL Beam in Hall D

KLF Collaboration, Moskov Amaryan, Mikhail Bashkanov +150

We propose to create a secondary beam of neutral kaons in Hall D at Jefferson Lab to be used with the GlueX experimental setup for strange hadron spectroscopy. The superior CEBAF e…

nucl-ex2020★ 7 cited

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

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

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

nucl-ex2019★ 25 cited

Beam Asymmetry $Σ$ for the Photoproduction of $η$ and $η^{'}$ Mesons at $E_{γ} = 8.8$ GeV

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

We report on the measurement of the beam asymmetry $Σ$ for the reactions $γ p \to p η$ and $γ p \to p η^{'}$ from the GlueX experiment, using an 8.2--8.8 Ge…

nucl-ex2019★ 205 cited

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

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

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

nucl-ex2019★ 2 cited

Decay pion spectroscopy: a new approach

A. Margaryan, R. Ajvazyan, N. Grigoryan +12

We propose a new experiment for decay pion spectroscopy of light hypernuclei at electron- and proton-beam facilities, using the recoil distance technique for separation of produced…

Compact sub-10 ps Resolution Radio Frequency Photomultiplier Tube

A Helical-Deflector-Based Radio-Frequency Spiral Scanning System for keV Energy Electrons

Search for the Y(2175) in the photoproduction cross section measurement of γp→ϕπ+π−p at GlueX

Threshold J/ψ Photoproduction as a Probe of Nuclear Gluon Structure

Baryon-antibaryon photoproduction cross sections off the proton

Picosecond Precision Heavy-Ion Detector for Λ Hypernuclei Lifetime Studies

Picosecond resolution photoelectron emission lifetime detection system

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

First Measurement of a20​(1320) Polarized Photoproduction Cross Section

First Measurement of Near- and Sub-Threshold J/ψ Photoproduction off Nuclei

Measurement of Spin-Density Matrix Elements in Δ++(1232) photoproduction

Upper Limit on the Photoproduction Cross Section of the Spin-Exotic π1​(1600)

Measurement of Spin-Density Matrix Elements in ρ(770) Production with a Linearly Polarized Photon Beam at Eγ​=8.2−8.8GeV

Measurement of the J/ψ photoproduction cross section over the full near-threshold kinematic region

Advanced Radio Frequency Timing AppaRATus (ARARAT) Technique and Applications

An RF Timer of Electrons and Photons with the Potential to reach Picosecond Precision

Search for photoproduction of axion-like particles at GlueX

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

Measurement of beam asymmetry for π−Δ++ photoproduction on the proton at Eγ​=8.5 GeV

Strange Hadron Spectroscopy with Secondary KL Beam in Hall D

Measurement of the Photon Beam Asymmetry in γ​p→K+Σ0 at Eγ​=8.5 GeV

Beam Asymmetry Σ for the Photoproduction of η and η′ Mesons at Eγ​=8.8GeV

First measurement of near-threshold J/ψ exclusive photoproduction off the proton

Decay pion spectroscopy: a new approach

Search for the $Y (2175)$ in the photoproduction cross section measurement of $γ p \to ϕ π^{+} π^{-} p$ at GlueX

Threshold $J / ψ$ Photoproduction as a Probe of Nuclear Gluon Structure

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

First Measurement of Near- and Sub-Threshold $J / ψ$ Photoproduction off Nuclei

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

Upper Limit on the Photoproduction Cross Section of the Spin-Exotic $π_{1} (1600)$

Measurement of Spin-Density Matrix Elements in $ρ (770)$ Production with a Linearly Polarized Photon Beam at $E_{γ} = 8.2 - 8.8 GeV$

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

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

Measurement of beam asymmetry for $π^{-} Δ^{++}$ photoproduction on the proton at $E_{γ}$ =8.5 GeV

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

Beam Asymmetry $Σ$ for the Photoproduction of $η$ and $η^{'}$ Mesons at $E_{γ} = 8.8$ GeV

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