Measurement of spin-density matrix elements in ρ(770) production with a linearly polarized photon beam at Eγ=8.2-8.8 GeV

GlueX Collaboration

doi:10.1103/PhysRevC.108.055204

Measurement of spin-density matrix elements in ρ(770) production with a linearly polarized photon beam at Eγ=8.2-8.8 GeV

GlueX Collaboration

Research output: Contribution to journal › Article › peer-review

Abstract

The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5GeV photons impinging on a hydrogen target which is contained within a detector with near-complete coverage for charged and neutral particles. We present measurements of spin-density matrix elements for the photoproduction of the vector meson ρ(770). The statistical precision achieved exceeds that of previous experiments for polarized photoproduction in this energy range by orders of magnitude. We confirm a high degree of s-channel helicity conservation at small squared four-momentum transfer t and are able to extract the t dependence of natural- and unnatural-parity exchange contributions to the production process in detail. We confirm the dominance of natural-parity exchange over the full t range. We also find that helicity amplitudes in which the helicity of the incident photon and the photoproduced ρ(770) differ by two units are negligible for -t<0.5GeV2/c2.

Original language	English (US)
Article number	055204
Journal	Physical Review C
Volume	108
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.108.055204
State	Published - Nov 2023
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.108.055204

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@article{b098074a8ee3454b81a8647a5b210626,

title = "Measurement of spin-density matrix elements in ρ(770) production with a linearly polarized photon beam at Eγ=8.2-8.8 GeV",

abstract = "The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5GeV photons impinging on a hydrogen target which is contained within a detector with near-complete coverage for charged and neutral particles. We present measurements of spin-density matrix elements for the photoproduction of the vector meson ρ(770). The statistical precision achieved exceeds that of previous experiments for polarized photoproduction in this energy range by orders of magnitude. We confirm a high degree of s-channel helicity conservation at small squared four-momentum transfer t and are able to extract the t dependence of natural- and unnatural-parity exchange contributions to the production process in detail. We confirm the dominance of natural-parity exchange over the full t range. We also find that helicity amplitudes in which the helicity of the incident photon and the photoproduced ρ(770) differ by two units are negligible for -t<0.5GeV2/c2.",

author = "{GlueX Collaboration} and S. Adhikari and F. Afzal and Akondi, {C. S.} and M. Albrecht and M. Amaryan and V. Arroyave and A. Asaturyan and A. Austregesilo and Z. Baldwin and F. Barbosa and J. Barlow and E. Barriga and R. Barsotti and Beattie, {T. D.} and Berdnikov, {V. V.} and T. Black and W. Boeglin and Briscoe, {W. J.} and T. Britton and Brooks, {W. K.} and D. Byer and E. Chudakov and Cole, {P. L.} and O. Cortes and V. Crede and Dalton, {M. M.} and D. Darulis and A. Deur and S. Dobbs and A. Dolgolenko and R. Dotel and M. Dugger and R. Dzhygadlo and D. Ebersole and M. Edo and H. Egiyan and T. Erbora and P. Eugenio and A. Fabrizi and C. Fanelli and S. Fang and S. Fegan and J. Fitches and Foda, {A. M.} and S. Furletov and L. Gan and H. Gao and A. Gardner and A. Gasparian and Ritchie, {B. G.}",

note = "Publisher Copyright: {\textcopyright} 2023 American Physical Society. ",

year = "2023",

month = nov,

doi = "10.1103/PhysRevC.108.055204",

language = "English (US)",

volume = "108",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "5",

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TY - JOUR

T1 - Measurement of spin-density matrix elements in ρ(770) production with a linearly polarized photon beam at Eγ=8.2-8.8 GeV

AU - GlueX Collaboration

AU - Adhikari, S.

AU - Afzal, F.

AU - Akondi, C. S.

AU - Albrecht, M.

AU - Amaryan, M.

AU - Arroyave, V.

AU - Asaturyan, A.

AU - Austregesilo, A.

AU - Baldwin, Z.

AU - Barbosa, F.

AU - Barlow, J.

AU - Barriga, E.

AU - Barsotti, R.

AU - Beattie, T. D.

AU - Berdnikov, V. V.

AU - Black, T.

AU - Boeglin, W.

AU - Briscoe, W. J.

AU - Britton, T.

AU - Brooks, W. K.

AU - Byer, D.

AU - Chudakov, E.

AU - Cole, P. L.

AU - Cortes, O.

AU - Crede, V.

AU - Dalton, M. M.

AU - Darulis, D.

AU - Deur, A.

AU - Dobbs, S.

AU - Dolgolenko, A.

AU - Dotel, R.

AU - Dugger, M.

AU - Dzhygadlo, R.

AU - Ebersole, D.

AU - Edo, M.

AU - Egiyan, H.

AU - Erbora, T.

AU - Eugenio, P.

AU - Fabrizi, A.

AU - Fanelli, C.

AU - Fang, S.

AU - Fegan, S.

AU - Fitches, J.

AU - Foda, A. M.

AU - Furletov, S.

AU - Gan, L.

AU - Gao, H.

AU - Gardner, A.

AU - Gasparian, A.

AU - Ritchie, B. G.

PY - 2023/11

Y1 - 2023/11

N2 - The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5GeV photons impinging on a hydrogen target which is contained within a detector with near-complete coverage for charged and neutral particles. We present measurements of spin-density matrix elements for the photoproduction of the vector meson ρ(770). The statistical precision achieved exceeds that of previous experiments for polarized photoproduction in this energy range by orders of magnitude. We confirm a high degree of s-channel helicity conservation at small squared four-momentum transfer t and are able to extract the t dependence of natural- and unnatural-parity exchange contributions to the production process in detail. We confirm the dominance of natural-parity exchange over the full t range. We also find that helicity amplitudes in which the helicity of the incident photon and the photoproduced ρ(770) differ by two units are negligible for -t<0.5GeV2/c2.

AB - The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5GeV photons impinging on a hydrogen target which is contained within a detector with near-complete coverage for charged and neutral particles. We present measurements of spin-density matrix elements for the photoproduction of the vector meson ρ(770). The statistical precision achieved exceeds that of previous experiments for polarized photoproduction in this energy range by orders of magnitude. We confirm a high degree of s-channel helicity conservation at small squared four-momentum transfer t and are able to extract the t dependence of natural- and unnatural-parity exchange contributions to the production process in detail. We confirm the dominance of natural-parity exchange over the full t range. We also find that helicity amplitudes in which the helicity of the incident photon and the photoproduced ρ(770) differ by two units are negligible for -t<0.5GeV2/c2.

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UR - http://www.scopus.com/inward/citedby.url?scp=85179072488&partnerID=8YFLogxK

U2 - 10.1103/PhysRevC.108.055204

DO - 10.1103/PhysRevC.108.055204

M3 - Article

AN - SCOPUS:85179072488

SN - 2469-9985

VL - 108

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 055204

ER -

Measurement of spin-density matrix elements in ρ(770) production with a linearly polarized photon beam at Eγ=8.2-8.8 GeV

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