First Measurement Using Elliptically Polarized Photons of the Double-Polarization Observable E for γp→pπ^{0} and γp→nπ^{+}.

Journal

Physical review letters
ISSN: 1079-7114
Titre abrégé: Phys Rev Lett
Pays: United States
ID NLM: 0401141

Informations de publication

Date de publication:
22 Mar 2024
Historique:
received: 18 07 2023
revised: 31 01 2024
accepted: 02 02 2024
medline: 5 4 2024
pubmed: 5 4 2024
entrez: 5 4 2024
Statut: ppublish

Résumé

We report the measurement of the helicity asymmetry E for the pπ^{0} and nπ^{+} final states using, for the first time, an elliptically polarized photon beam in combination with a longitudinally polarized target at the Crystal Ball experiment at MAMI. The results agree very well with data that were taken with a circularly polarized photon beam, showing that it is possible to simultaneously measure polarization observables that require linearly (e.g., G) and circularly polarized photons (e.g., E) and a longitudinally polarized target. The new data cover a photon energy range 270-1400 MeV for the pπ^{0} final state (230-842 MeV for the nπ^{+} final state) and the full range of pion polar angles, θ, providing the most precise measurement of the observable E. A moment analysis gives a clear observation of the pη cusp in the pπ^{0} final state.

Identifiants

DOI: 10.1103/PhysRevLett.132.121902 PMID: 38579200
pubmed: 38579200
doi: 10.1103/PhysRevLett.132.121902
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

121902

Auteurs

F Afzal (F)

Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany.

K Spieker (K)

Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany.

P Hurck (P)

SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.

S Abt (S)

Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.

P Achenbach (P)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

P Adlarson (P)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

Z Ahmed (Z)

University of Regina, Regina, SK S4S0A2, Canada.

C S Akondi (CS)

Kent State University, Kent, Ohio 44242, USA.

J R M Annand (JRM)

SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.

H J Arends (HJ)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

M Bashkanov (M)

Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.

R Beck (R)

Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany.

M Biroth (M)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

N Borisov (N)

Joint Institute for Nuclear Research, 141980 Dubna, Russia.

A Braghieri (A)

INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.

W J Briscoe (WJ)

Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA.

F Cividini (F)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

C Collicott (C)

Department of Astronomy and Physics, Saint Mary's University, E4L1E6 Halifax, Canada.

S Costanza (S)

INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.
Dipartimento di Fisica, Università di Pavia, I-27100 Pavia, Italy.

A Denig (A)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

M Dieterle (M)

Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.

E J Downie (EJ)

Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA.

P Drexler (P)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
II. Physikalisches Institut, University of Giessen, D-35392 Giessen, Germany.

S Fegan (S)

Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.

S Gardner (S)

SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.

D Ghosal (D)

Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.

D I Glazier (DI)

SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.

I Gorodnov (I)

Joint Institute for Nuclear Research, 141980 Dubna, Russia.

W Gradl (W)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

D Gurevich (D)

Institute for Nuclear Research, RU-125047 Moscow, Russia.

L Heijkenskjöld (L)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

D Hornidge (D)

Mount Allison University, Sackville, New Brunswick E4L1E6, Canada.

G M Huber (GM)

University of Regina, Regina, SK S4S0A2, Canada.

V L Kashevarov (VL)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
Joint Institute for Nuclear Research, 141980 Dubna, Russia.

S J D Kay (SJD)

Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.

M Korolija (M)

Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.

B Krusche (B)

Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.

A Lazarev (A)

Joint Institute for Nuclear Research, 141980 Dubna, Russia.

K Livingston (K)

SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.

S Lutterer (S)

Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.

I J D MacGregor (IJD)

SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.

R G Macrae (RG)

SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.

D M Manley (DM)

Kent State University, Kent, Ohio 44242, USA.

P P Martel (PP)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.
Mount Allison University, Sackville, New Brunswick E4L1E6, Canada.

R Miskimen (R)

University of Massachusetts, Amherst, Massachusetts 01003, USA.

M Mocanu (M)

Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.

E Mornacchi (E)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

C Mullen (C)

SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.

A Neganov (A)

Joint Institute for Nuclear Research, 141980 Dubna, Russia.

A Neiser (A)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

M Oberle (M)

Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.

M Ostrick (M)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

P B Otte (PB)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

D Paudyal (D)

University of Regina, Regina, SK S4S0A2, Canada.

P Pedroni (P)

INFN Sezione di Pavia, I-27100 Pavia, Pavia, Italy.

A Powell (A)

SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom.

G Reicherz (G)

Institut für Experimentalphysik, Ruhr Universität, 44780 Bochum, Germany.

T Rostomyan (T)

Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.

C Sfienti (C)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

V Sokhoyan (V)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

O Steffen (O)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

I I Strakovsky (II)

Center for Nuclear Studies, The George Washington University, Washington, DC 20052, USA.

T Strub (T)

Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.

I Supek (I)

Rudjer Boskovic Institute, HR-10000 Zagreb, Croatia.

A Thiel (A)

Helmholtz-Institut für Strahlen- und Kernphysik, University of Bonn, D-53115 Bonn, Germany.

M Thiel (M)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

A Thomas (A)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

Yu A Usov (YA)

Joint Institute for Nuclear Research, 141980 Dubna, Russia.

S Wagner (S)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

N K Walford (NK)

Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.

D P Watts (DP)

Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.

D Werthmüller (D)

Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.

J Wettig (J)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

L Witthauer (L)

Department of Physics, University of Basel, Ch-4056 Basel, Switzerland.

M Wolfes (M)

Institut für Kernphysik, University of Mainz, D-55099 Mainz, Germany.

N Zachariou (N)

Department of Physics, University of York, Heslington, York, Y010 5DD, United Kingdom.

Classifications MeSH