Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons

Publication type:

Journal article

Metadata:

Autoren

L Witthauer
M Dieterle
S Abt
P Achenbach
F Afzal
Z Ahmed
CS Akondi
JRM Annand
HJ Arends
M Bashkanov
R Beck
M Biroth
NS Borisov
A Braghieri
WJ Briscoe
F Cividini
S Costanza
C Collicott
A Denig
EJ Downie
P Drexler
MI Ferretti-Bondy
S Gardner
S Garni
DI Glazier
D Glowa
W Gradl
M Gunther
GM Gurevich
D Hamilton
D Hornidge
GM Huber
A Kaeser
VL Kashevarov
S Kay
I Keshelashvili
R Kondratiev
M Korolija
B Krusche
AB Lazarev
JM Linturi
V Lisin
K Livingston
S Lutterer
IJD MacGregor
J Mancell
DM Manley
PP Martel
V Metag
W Meyer
R Miskimen
E Mornacchi
A Mushkarenkov
AB Neganov
A Neiser
M Oberle
M Ostrick
PB Otte
D Paudyal
P Pedroni
A Polonski
SN Prakhov
A Rajabi
G Reicherz
G Ron
T Rostomyan
A Sarty
C Sfienti
MH Sikora
V Sokhoyan
K Spieker
O Steffen
II Strakovsky
Th Strub
I Supek
A Thiel
M Thiel
A Thomas
M Unverzagt
Yu A Usov
S Wagner
NK Walford
DP Watts
D Werthmueller
J Wettig
M Wolfes
L Zana

Autoren-URL

https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=fis-test-1&SrcAuth=WosAPI&KeyUT=WOS:000400666200003&DestLinkType=FullRecord&DestApp=WOS_CPL

DOI

10.1103/PhysRevC.95.055201

eISSN

2469-9993

Externe Identifier

Clarivate Analytics Document Solution ID: ET9YQ

ISSN

2469-9985

Ausgabe der Veröffentlichung

Zeitschrift

PHYSICAL REVIEW C

Artikelnummer

ARTN 055201

Datum der Veröffentlichung

2017

Status

Published

Titel

Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons

Sub types

Article

Ausgabe der Zeitschrift

Data source: Web of Science (Lite)

Other metadata sources:

Autoren

L Witthauer
M Dieterle
S Abt
P Achenbach
F Afzal
Z Ahmed
CS Akondi
JRM Annand
HJ Arends
M Bashkanov
R Beck
M Biroth
NS Borisov
A Braghieri
WJ Briscoe
F Cividini
S Costanza
C Collicott
A Denig
EJ Downie
P Drexler
MI Ferretti-Bondy
S Gardner
S Garni
DI Glazier
D Glowa
W Gradl
M Günther
GM Gurevich
D Hamilton
D Hornidge
GM Huber
A Käser
VL Kashevarov
S Kay
I Keshelashvili
R Kondratiev
M Korolija
B Krusche
AB Lazarev
JM Linturi
V Lisin
K Livingston
S Lutterer
IJD MacGregor
J Mancell
DM Manley
PP Martel
V Metag
W Meyer
R Miskimen
E Mornacchi
A Mushkarenkov
AB Neganov
A Neiser
M Oberle
M Ostrick
PB Otte
D Paudyal
P Pedroni
A Polonski
SN Prakhov
A Rajabi
G Reicherz
G Ron
T Rostomyan
A Sarty
C Sfienti
MH Sikora
V Sokhoyan
K Spieker
O Steffen
II Strakovsky
Th Strub
I Supek
A Thiel
M Thiel
A Thomas
M Unverzagt
Yu A Usov
S Wagner
NK Walford
DP Watts
D Werthmüller
J Wettig
M Wolfes
L Zana

DOI

10.1103/physrevc.95.055201

eISSN

2469-9993

ISSN

2469-9985

Ausgabe der Veröffentlichung

Zeitschrift

Physical Review C

Sprache

Artikelnummer

055201

Online publication date

2017

Status

Published online

Herausgeber

American Physical Society (APS)

Herausgeber URL

http://dx.doi.org/10.1103/physrevc.95.055201

Datum der Datenerfassung

2017

Titel

Helicity-dependent cross sections and double-polarization observable <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>E</mml:mi></mml:math> in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>η</mml:mi></mml:math> photoproduction from quasifree protons and neutrons

Ausgabe der Zeitschrift

Data source: Crossref

Abstract

Precise helicity-dependent cross sections and the double-polarization observable $E$ were measured for $\eta$ photoproduction from quasi-free protons and neutrons bound in the deuteron. The $\eta\rightarrow 2\gamma$ and $\eta\rightarrow 3\pi^0\rightarrow 6\gamma$ decay modes were used to optimize the statistical quality of the data and to estimate systematic uncertainties. The measurement used the A2 detector setup at the tagged photon beam of the electron accelerator MAMI in Mainz. A longitudinally polarized deuterated butanol target was used in combination with a circularly polarized photon beam from bremsstrahlung of a longitudinally polarized electron beam. The reaction products were detected with the electromagnetic calorimeters Crystal Ball and TAPS, which covered 98\% of the full solid angle. The results show that the narrow structure observed earlier in the unpolarized excitation function of $\eta$ photoproduction off the neutron appears only in reactions with antiparallel photon and nucleon spin ($\sigma_{1/2}$). It is absent for reactions with parallel spin orientation ($\sigma_{3/2}$) and thus very probably related to partial waves with total spin 1/2. The behavior of the angular distributions of the helicity-dependent cross sections was analyzed by fitting them with Legendre polynomials. The results are in good agreement with a model from the Bonn-Gatchina group, which uses an interference of $P_{11}$ and $S_{11}$ partial waves to explain the narrow structure.

Autoren

L Witthauer
M Dieterle
S Abt
P Achenbach
F Afzal
Z Ahmed
CS Akondi
JRM Annand
HJ Arends
M Bashkanov
R Beck
M Biroth
NS Borisov
A Braghieri
WJ Briscoe
F Cividini
S Costanza
C Collicott
A Denig
EJ Downie
P Drexler
MI Ferretti-Bondy
S Gardner
S Garni
DI Glazier
D Glowa
W Gradl
M Günther
GM Gurevich
D Hamilton
D Hornidge
GM Huber
A Käser
VL Kashevarov
S Kay
I Keshelashvili
R Kondratiev
M Korolija
B Krusche
AB Lazarev
JM Linturi
V Lisin
K Livingston
S Lutterer
IJD MacGregor
J Mancell
DM Manley
PP Martel
V Metag
W Meyer
R Miskimen
E Mornacchi
A Mushkarenkov
AB Neganov
A Neiser
M Oberle
M Ostrick
PB Otte
D Paudyal
P Pedroni
A Polonski
SN Prakhov
A Rajabi
G Reicherz
G Ron
T Rostomyan
A Sarty
C Sfienti
MH Sikora
V Sokhoyan
K Spieker
O Steffen
II Strakovsky
Th Strub
I Supek
A Thiel
M Thiel
A Thomas
M Unverzagt
Yu A Usov
S Wagner
NK Walford
DP Watts
D Werthmüller
J Wettig
M Wolfes
L Zana

Autoren-URL

http://arxiv.org/abs/1704.00649v1

Zeitschrift

Phys. Rev. C

Schlüsselwörter

nucl-ex
nucl-ex

Notes

accepted for publication in Phys. Rev. C

Paginierung

055201

Datum der Veröffentlichung

2017

Herausgeber URL

http://dx.doi.org/10.1103/PhysRevC.95.055201

Datum der Datenerfassung

2017

Datum, an dem der Datensatz öffentlich gemacht wurde

2017

Titel

Helicity-dependent cross sections and double-polarization observable E in eta photoproduction from quasi-free protons and neutrons

Ausgabe der Zeitschrift

Files

1704.00649v1.pdf

Data source: arXiv

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Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons

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