Insight into the Narrow Structure in η Photoproduction on the Neutron from Helicity-Dependent Cross Sections

Autoren

L Witthauer
M Dieterle
S Abt
P Achenbach
F Afzal
Z Ahmed
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 Strakovski
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/physrevlett.117.132502

eISSN

1079-7114

ISSN

0031-9007

Ausgabe der Veröffentlichung

13

Zeitschrift

Physical Review Letters

Sprache

en

Artikelnummer

132502

Online publication date

2016

Status

Published online

Herausgeber

American Physical Society (APS)

Herausgeber URL

http://dx.doi.org/10.1103/physrevlett.117.132502

Datum der Datenerfassung

2017

Titel

Insight into the Narrow Structure in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>η</mml:mi></mml:math>Photoproduction on the Neutron from Helicity-Dependent Cross Sections

Ausgabe der Zeitschrift

117

Data source: Crossref

Abstract

The double polarization observable E and the helicity dependent cross sections σ_{1/2} and σ_{3/2} were measured for η photoproduction from quasifree protons and neutrons. The circularly polarized tagged photon beam of the A2 experiment at the Mainz MAMI accelerator was used in combination with a longitudinally polarized deuterated butanol target. The almost 4π detector setup of the Crystal Ball and TAPS is ideally suited to detect the recoil nucleons and the decay photons from η→2γ and η→3π^{0}. The results show that the narrow structure previously observed in η photoproduction from the neutron is only apparent in σ_{1/2} and hence, most likely related to a spin-1/2 amplitude. Nucleon resonances that contribute to this partial wave in η production are only N 1/2^{-} (S_{11}) and N 1/2^{+} (P_{11}). Furthermore, the extracted Legendre coefficients of the angular distributions for σ_{1/2} are in good agreement with recent reaction model predictions assuming a narrow resonance in the P_{11} wave as the origin of this structure.

Addresses

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

Autoren

L Witthauer
M Dieterle
S Abt
P Achenbach
F Afzal
Z Ahmed
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 Strakovski
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
A2 Collaboration at MAMI

DOI

10.1103/physrevlett.117.132502

eISSN

1079-7114

Externe Identifier

PubMed Identifier: 27715117

Funding acknowledgements

Science and Technology Facilities Council: 1526286
U.S. Department of Energy: DE-FG02-01-ER41194
Swiss National Science Foundation: 132799
U.S. Department of Energy: DE-FG02-88ER40415
U.S. Department of Energy: DE-FG02-99-ER41110
Deutsche Forschungsgemeinschaft: SFB 1044
Deutsche Forschungsgemeinschaft: SFB/TR16
Science and Technology Facilities Council: ST/L00478X/1
Swiss National Science Foundation: 200020-156983
Natural Sciences and Engineering Research Council of Canada: SAPPJ-2015-00023
Science and Technology Facilities Council: ST/J000175/1
Instituto Nazionale di Fisica Nucleare:
Swiss National Science Foundation: 121781
National Science Foundation: IIA-1358175
Deutsche Forschungsgemeinschaft: SFB 443
Swiss National Science Foundation: 117601
National Science Foundation: PHY-1039130
Science and Technology Facilities Council: ST/G008604/1
Science and Technology Facilities Council: ST/J00006X/1
Seventh Framework Programme: 227431
Science and Technology Facilities Council: ST/G008582/1

Open access

false

ISSN

0031-9007

Ausgabe der Veröffentlichung

13

Zeitschrift

Physical review letters

Schlüsselwörter

A2 Collaboration at MAMI

Sprache

eng

Medium

Print-Electronic

Online publication date

2016

Paginierung

132502

Datum der Veröffentlichung

2016

Status

Published

Datum der Datenerfassung

2016

Titel

Insight into the Narrow Structure in η Photoproduction on the Neutron from Helicity-Dependent Cross Sections.

Sub types

Journal Article

Ausgabe der Zeitschrift

117

Data source: Europe PubMed Central

Abstract

The double polarization observable E and the helicity dependent cross sections σ_{1/2} and σ_{3/2} were measured for η photoproduction from quasifree protons and neutrons. The circularly polarized tagged photon beam of the A2 experiment at the Mainz MAMI accelerator was used in combination with a longitudinally polarized deuterated butanol target. The almost 4π detector setup of the Crystal Ball and TAPS is ideally suited to detect the recoil nucleons and the decay photons from η→2γ and η→3π^{0}. The results show that the narrow structure previously observed in η photoproduction from the neutron is only apparent in σ_{1/2} and hence, most likely related to a spin-1/2 amplitude. Nucleon resonances that contribute to this partial wave in η production are only N 1/2^{-} (S_{11}) and N 1/2^{+} (P_{11}). Furthermore, the extracted Legendre coefficients of the angular distributions for σ_{1/2} are in good agreement with recent reaction model predictions assuming a narrow resonance in the P_{11} wave as the origin of this structure.

Autoren

L Witthauer
M Dieterle
S Abt
P Achenbach
F Afzal
Z Ahmed
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 Strakovski
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
A2 Collaboration at MAMI

Autoren-URL

https://www.ncbi.nlm.nih.gov/pubmed/27715117

DOI

10.1103/PhysRevLett.117.132502

eISSN

1079-7114

Ausgabe der Veröffentlichung

13

Zeitschrift

Phys Rev Lett

Sprache

eng

Country

United States

Paginierung

132502

Datum der Veröffentlichung

2016

Status

Published

Datum, an dem der Datensatz öffentlich gemacht wurde

2018

Titel

Insight into the Narrow Structure in η Photoproduction on the Neutron from Helicity-Dependent Cross Sections.

Sub types

Journal Article

Ausgabe der Zeitschrift

117

Data source: PubMed

Abstract

The double polarization observable $E$ and the helicity dependent cross sections $\sigma_{1/2}$ and $\sigma_{3/2}$ were measured for $\eta$ photoproduction from quasi-free protons and neutrons. The circularly polarized tagged photon beam of the A2 experiment at the Mainz MAMI accelerator was used in combination with a longitudinally polarized deuterated butanol target. The almost $4\pi$ detector setup of the Crystal Ball and TAPS is ideally suited to detect the recoil nucleons and the decay photons from $\eta\rightarrow 2\gamma$ and $\eta\rightarrow 3\pi^0$. The results show that the narrow structure previously observed in $\eta$ photoproduction from the neutron is only apparent in $\sigma_{1/2}$ and hence, most likely related to a spin-1/2 amplitude. Nucleon resonances that contribute to this partial wave in $\eta$ production are only $N1/2^-$ ($S_{11}$) and $N1/2^+$ ($P_{11}$). Furthermore, the extracted Legendre coefficients of the angular distributions for $\sigma_{1/2}$ are in good agreement with recent reaction model predictions assuming a narrow resonance in the $P_{11}$ wave as the origin of this structure.

Autoren

L Witthauer
M Dieterle
S Abt
P Achenbach
F Afzal
Z Ahmed
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
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/1702.01408v1

Zeitschrift

Phys. Rev. Lett.

Schlüsselwörter

nucl-ex
nucl-ex

Paginierung

132502

Datum der Veröffentlichung

2017

Herausgeber URL

http://dx.doi.org/10.1103/PhysRevLett.117.132502

Datum der Datenerfassung

2017

Datum, an dem der Datensatz öffentlich gemacht wurde

2017

Titel

Insight into the narrow structure in {\boldmath{$η$}}-photoproduction on the neutron from helicity dependent cross sections

Ausgabe der Zeitschrift

117

Files

1702.01408v1.pdf

Data source: arXiv

Insight into the Narrow Structure in η Photoproduction on the Neutron from Helicity-Dependent Cross Sections

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