Beam-Target Helicity Asymmetry for γ → n → →π-p in the N∗ Resonance Region

(CLAS Collaboration)

doi:10.1103/PhysRevLett.118.242002

Beam-Target Helicity Asymmetry for γ → n → →π-p in the N∗ Resonance Region

(CLAS Collaboration)

Carnegie Mellon University
University of Virginia
Thomas Jefferson National Accelerator Facility
Catholic University of America
University of Rome Tor Vergata
University of Edinburgh
Norfolk State University
George Washington University
University of Bonn
Université Clermont Auvergne
University of Iowa
Old Dominion University
RAS - Saint Petersburg Nuclear Physics Institute
University of Connecticut
Ruder Boskovic Institute
James Madison University
Mississippi State University
Florida State University
National Institute for Nuclear Physics
Université Paris-Saclay
Alikhanov Institute for Theoretical and Experimental Physics
Fairfield University
Ohio University
University of Ferrara
University of Glasgow

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

34 Scopus citations

Abstract

We report the first beam-target double-polarization asymmetries in the γ+n(p)→π-+p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several γnN∗ resonance photocouplings.

Original language	English
Article number	242002
Journal	Physical Review Letters
Volume	118
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevLett.118.242002
State	Published - 16 Jun 2017

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10.1103/PhysRevLett.118.242002

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@article{d61decc1ce7f4bc081260f3d805228c2,

title = "Beam-Target Helicity Asymmetry for γ → n → →π-p in the N∗ Resonance Region",

abstract = "We report the first beam-target double-polarization asymmetries in the γ+n(p)→π-+p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several γnN∗ resonance photocouplings.",

author = "\{(CLAS Collaboration)\} and D. Ho and P. Peng and C. Bass and P. Collins and A. D'Angelo and A. Deur and J. Fleming and C. Hanretty and T. Kageya and M. Khandaker and Klein, \{F. J.\} and E. Klempt and V. Laine and Lowry, \{M. M.\} and H. Lu and C. Nepali and Nikonov, \{V. A.\} and T. O'Connell and Sandorfi, \{A. M.\} and Sarantsev, \{A. V.\} and Schumacher, \{R. A.\} and Strakovsky, \{I. I.\} and A. {\v S}varc and Walford, \{N. K.\} and X. Wei and Whisnant, \{C. S.\} and Workman, \{R. L.\} and I. Zonta and Adhikari, \{K. P.\} and D. Adikaram and Z. Akbar and Amaryan, \{M. J.\} and \{Anefalos Pereira\}, S. and H. Avakian and J. Ball and M. Bashkanov and M. Battaglieri and V. Batourine and I. Bedlinskiy and A. Biselli and Briscoe, \{W. J.\} and Burkert, \{V. D.\} and Carman, \{D. S.\} and A. Celentano and G. Charles and T. Chetry and G. Ciullo and L. Clark and L. Colaneri and Jo, \{H. S.\}",

note = "Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

year = "2017",

month = jun,

day = "16",

doi = "10.1103/PhysRevLett.118.242002",

language = "English",

volume = "118",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "24",

}

TY - JOUR

T1 - Beam-Target Helicity Asymmetry for γ → n → →π-p in the N∗ Resonance Region

AU - (CLAS Collaboration)

AU - Ho, D.

AU - Peng, P.

AU - Bass, C.

AU - Collins, P.

AU - D'Angelo, A.

AU - Deur, A.

AU - Fleming, J.

AU - Hanretty, C.

AU - Kageya, T.

AU - Khandaker, M.

AU - Klein, F. J.

AU - Klempt, E.

AU - Laine, V.

AU - Lowry, M. M.

AU - Lu, H.

AU - Nepali, C.

AU - Nikonov, V. A.

AU - O'Connell, T.

AU - Sandorfi, A. M.

AU - Sarantsev, A. V.

AU - Schumacher, R. A.

AU - Strakovsky, I. I.

AU - Švarc, A.

AU - Walford, N. K.

AU - Wei, X.

AU - Whisnant, C. S.

AU - Workman, R. L.

AU - Zonta, I.

AU - Adhikari, K. P.

AU - Adikaram, D.

AU - Akbar, Z.

AU - Amaryan, M. J.

AU - Anefalos Pereira, S.

AU - Avakian, H.

AU - Ball, J.

AU - Bashkanov, M.

AU - Battaglieri, M.

AU - Batourine, V.

AU - Bedlinskiy, I.

AU - Biselli, A.

AU - Briscoe, W. J.

AU - Burkert, V. D.

AU - Carman, D. S.

AU - Celentano, A.

AU - Charles, G.

AU - Chetry, T.

AU - Ciullo, G.

AU - Clark, L.

AU - Colaneri, L.

AU - Jo, H. S.

PY - 2017/6/16

Y1 - 2017/6/16

N2 - We report the first beam-target double-polarization asymmetries in the γ+n(p)→π-+p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several γnN∗ resonance photocouplings.

AB - We report the first beam-target double-polarization asymmetries in the γ+n(p)→π-+p(p) reaction spanning the nucleon resonance region from invariant mass W=1500 to 2300 MeV. Circularly polarized photons and longitudinally polarized deuterons in solid hydrogen deuteride (HD) have been used with the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The exclusive final state has been extracted using three very different analyses that show excellent agreement, and these have been used to deduce the E polarization observable for an effective neutron target. These results have been incorporated into new partial wave analyses and have led to significant revisions for several γnN∗ resonance photocouplings.

UR - https://www.scopus.com/pages/publications/85020502186

U2 - 10.1103/PhysRevLett.118.242002

DO - 10.1103/PhysRevLett.118.242002

M3 - Article

C2 - 28665642

AN - SCOPUS:85020502186

SN - 0031-9007

VL - 118

JO - Physical Review Letters

JF - Physical Review Letters

IS - 24

M1 - 242002

ER -

Beam-Target Helicity Asymmetry for γ → n → →π-p in the N∗ Resonance Region

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