Near Threshold Neutral Pion Electroproduction at High Momentum Transfers and Generalized Form Factors
P. Khetarpal
,
P. Stoler
,
I. G. Aznauryan
,
V. Kubarovsky
,
K. P. Adhikari
,
D. Adikaram
,
M. Aghasyan
,
M. J. Amaryan
,
M. D. Anderson
,
S. Anefalos Pereira
,
M. Anghinolfi
,
H. Avakian
,
H. Baghdasaryan
,
J. Ball
(1)
,
N. A. Baltzell
,
M. Battaglieri
,
V. Batourine
,
I. Bedlinskiy
,
A. S. Biselli
,
J. Bono
,
S. Boiarinov
,
W. J. Briscoe
,
W. K. Brooks
,
V. D. Burkert
,
D. S. Carman
,
A. Celentano
,
G. Charles
(1)
,
P. L. Cole
,
M. Contalbrigo
,
V. Crede
,
A. d'Angelo
,
N. Dashyan
,
R. de Vita
,
E. de Sanctis
,
A. Deur
,
C. Djalali
,
D. Doughty
,
M. Dugger
,
R. Dupre
,
H. Egiyan
,
A. El Alaoui
,
L. El Fassi
,
P. Eugenio
,
G. Fedotov
,
S. Fegan
,
R. Fersch
,
J. A. Fleming
,
A. Fradi
,
M. Y. Gabrielyan
,
M. Garçon
(1)
,
N. Gevorgyan
,
G. P. Gilfoyle
,
K. L. Giovanetti
,
F. X. Girod
,
J. T. Goetz
,
W. Gohn
,
E. Golovatch
,
R. W. Gothe
,
K. A. Griffioen
,
B. Guegan
,
M. Guidal
,
L. Guo
,
K. Hafidi
,
H. Hakobyan
,
C. Hanretty
,
N. Harrison
,
K. Hicks
,
D. Ho
,
M. Holtrop
,
C. E. Hyde
,
Y. Ilieva
,
D. G. Ireland
,
B. S. Ishkhanov
,
E. L. Isupov
,
H. S. Jo
,
K. Joo
,
D. Keller
,
M. Khandaker
,
A. Kim
,
W. Kim
,
F. J. Klein
,
S. Koirala
,
A. Kubarovsky
,
S. V. Kuleshov
,
N. D. Kvaltine
,
S. Lewis
,
K. Livingston
,
H. Y. Lu
,
I. J. D. Macgregor
,
Y. Mao
,
David Martinez
,
M. Mayer
,
B. Mckinnon
,
C. A. Meyer
,
T. Mineeva
,
M. Mirazita
,
V. Mokeev
,
R. A. Montgomery
,
H. Moutarde
(1)
,
E. Munevar
,
C. Muñoz Camacho
,
P. Nadel-Turonski
,
R. Nasseripour
,
S. Niccolai
,
G. Niculescu
,
I. Niculescu
,
M. Osipenko
,
A. I. Ostrovidov
,
L. L. Pappalardo
,
R. Paremuzyan
,
K. Park
,
S. Park
,
E. Pasyuk
,
E. Phelps
,
J. J. Phillips
,
S. Pisano
,
O. Pogorelko
,
S. Pozdniakov
,
J. W. Price
,
S. Procureur
(1)
,
D. Protopopescu
,
A. J. R. Puckett
,
B. A. Raue
,
G. Ricco
,
D. Rimal
,
M. Ripani
,
G. Rosner
,
P. Rossi
,
F. Sabatié
(1)
,
M. S. Saini
,
C. Salgado
,
N. A. Saylor
,
D. Schott
,
R. A. Schumacher
,
E. Seder
,
H. Seraydaryan
,
Y. G. Sharabian
,
G. D. Smith
,
D. I. Sober
,
D. Sokhan
,
S. S. Stepanyan
,
S. Stepanyan
,
I. I. Strakovsky
,
S. Strauch
,
M. Taiuti
,
W. Tang
,
C. E. Taylor
,
S. Tkachenko
,
M. Ungaro
,
B. Vernarsky
,
H. Voskanyan
,
E. Voutier
(2)
,
N. K. Walford
,
L. B. Weinstein
,
D. P. Weygand
,
M. H. Wood
,
N. Zachariou
,
J. Zhang
,
Z. W. Zhao
,
I. Zonta
P. Khetarpal
- Function : Author
P. Stoler
- Function : Author
I. G. Aznauryan
- Function : Author
V. Kubarovsky
- Function : Author
K. P. Adhikari
- Function : Author
D. Adikaram
- Function : Author
M. Aghasyan
- Function : Author
M. J. Amaryan
- Function : Author
M. D. Anderson
- Function : Author
S. Anefalos Pereira
- Function : Author
M. Anghinolfi
- Function : Author
H. Avakian
- Function : Author
H. Baghdasaryan
- Function : Author
N. A. Baltzell
- Function : Author
M. Battaglieri
- Function : Author
V. Batourine
- Function : Author
I. Bedlinskiy
- Function : Author
- PersonId : 755548
- ORCID : 0000-0002-0289-0866
A. S. Biselli
- Function : Author
J. Bono
- Function : Author
S. Boiarinov
- Function : Author
W. J. Briscoe
- Function : Author
W. K. Brooks
- Function : Author
V. D. Burkert
- Function : Author
D. S. Carman
- Function : Author
A. Celentano
- Function : Author
- PersonId : 764982
- ORCID : 0000-0002-7104-2983
P. L. Cole
- Function : Author
M. Contalbrigo
- Function : Author
V. Crede
- Function : Author
A. d'Angelo
- Function : Author
- PersonId : 755183
- ORCID : 0000-0003-3050-4907
N. Dashyan
- Function : Author
R. de Vita
- Function : Author
E. de Sanctis
- Function : Author
A. Deur
- Function : Author
- PersonId : 755225
- ORCID : 0000-0002-2203-7723
C. Djalali
- Function : Author
D. Doughty
- Function : Author
M. Dugger
- Function : Author
R. Dupre
- Function : Author
- PersonId : 740338
- IdHAL : raphael-dupre
- ORCID : 0000-0001-7935-8221
- IdRef : 165334010
H. Egiyan
- Function : Author
- PersonId : 755392
- ORCID : 0000-0002-5881-3616
A. El Alaoui
- Function : Author
L. El Fassi
- Function : Author
P. Eugenio
- Function : Author
G. Fedotov
- Function : Author
S. Fegan
- Function : Author
- PersonId : 740343
- IdHAL : stephen-fegan
- IdRef : 253133149
R. Fersch
- Function : Author
J. A. Fleming
- Function : Author
A. Fradi
- Function : Author
M. Y. Gabrielyan
- Function : Author
N. Gevorgyan
- Function : Author
G. P. Gilfoyle
- Function : Author
K. L. Giovanetti
- Function : Author
F. X. Girod
- Function : Author
J. T. Goetz
- Function : Author
W. Gohn
- Function : Author
E. Golovatch
- Function : Author
R. W. Gothe
- Function : Author
K. A. Griffioen
- Function : Author
B. Guegan
- Function : Author
M. Guidal
- Function : Author
L. Guo
- Function : Author
K. Hafidi
- Function : Author
H. Hakobyan
- Function : Author
C. Hanretty
- Function : Author
N. Harrison
- Function : Author
K. Hicks
- Function : Author
D. Ho
- Function : Author
M. Holtrop
- Function : Author
- PersonId : 755237
- ORCID : 0000-0002-1110-1152
C. E. Hyde
- Function : Author
Y. Ilieva
- Function : Author
D. G. Ireland
- Function : Author
B. S. Ishkhanov
- Function : Author
E. L. Isupov
- Function : Author
H. S. Jo
- Function : Author
K. Joo
- Function : Author
D. Keller
- Function : Author
- PersonId : 755224
- ORCID : 0000-0002-2608-1270
M. Khandaker
- Function : Author
- PersonId : 755252
- ORCID : 0000-0003-0370-9536
A. Kim
- Function : Author
W. Kim
- Function : Author
F. J. Klein
- Function : Author
S. Koirala
- Function : Author
A. Kubarovsky
- Function : Author
S. V. Kuleshov
- Function : Author
N. D. Kvaltine
- Function : Author
S. Lewis
- Function : Author
K. Livingston
- Function : Author
H. Y. Lu
- Function : Author
I. J. D. Macgregor
- Function : Author
Y. Mao
- Function : Author
David Martinez
- Function : Author
- PersonId : 831565
M. Mayer
- Function : Author
B. Mckinnon
- Function : Author
C. A. Meyer
- Function : Author
T. Mineeva
- Function : Author
- PersonId : 761901
- ORCID : 0000-0002-1774-4802
M. Mirazita
- Function : Author
V. Mokeev
- Function : Author
- PersonId : 755398
- ORCID : 0000-0002-4557-1320
R. A. Montgomery
- Function : Author
E. Munevar
- Function : Author
C. Muñoz Camacho
- Function : Author
- PersonId : 742360
- IdHAL : carlos-munoz-camacho
P. Nadel-Turonski
- Function : Author
R. Nasseripour
- Function : Author
S. Niccolai
- Function : Author
G. Niculescu
- Function : Author
I. Niculescu
- Function : Author
M. Osipenko
- Function : Author
- PersonId : 755399
- ORCID : 0000-0001-9618-3013
A. I. Ostrovidov
- Function : Author
L. L. Pappalardo
- Function : Author
R. Paremuzyan
- Function : Author
K. Park
- Function : Author
S. Park
- Function : Author
E. Pasyuk
- Function : Author
- PersonId : 755395
- ORCID : 0000-0003-3877-1815
E. Phelps
- Function : Author
J. J. Phillips
- Function : Author
S. Pisano
- Function : Author
O. Pogorelko
- Function : Author
S. Pozdniakov
- Function : Author
J. W. Price
- Function : Author
D. Protopopescu
- Function : Author
- PersonId : 755397
- ORCID : 0000-0002-8047-6513
A. J. R. Puckett
- Function : Author
B. A. Raue
- Function : Author
G. Ricco
- Function : Author
D. Rimal
- Function : Author
M. Ripani
- Function : Author
- PersonId : 755184
- ORCID : 0000-0001-8632-7538
G. Rosner
- Function : Author
P. Rossi
- Function : Author
M. S. Saini
- Function : Author
C. Salgado
- Function : Author
N. A. Saylor
- Function : Author
D. Schott
- Function : Author
R. A. Schumacher
- Function : Author
E. Seder
- Function : Author
H. Seraydaryan
- Function : Author
Y. G. Sharabian
- Function : Author
G. D. Smith
- Function : Author
D. I. Sober
- Function : Author
D. Sokhan
- Function : Author
S. S. Stepanyan
- Function : Author
S. Stepanyan
- Function : Author
I. I. Strakovsky
- Function : Author
S. Strauch
- Function : Author
M. Taiuti
- Function : Author
W. Tang
- Function : Author
C. E. Taylor
- Function : Author
S. Tkachenko
- Function : Author
M. Ungaro
- Function : Author
B. Vernarsky
- Function : Author
H. Voskanyan
- Function : Author
E. Voutier
- Function : Author
- PersonId : 749688
- IdHAL : eric-voutier
N. K. Walford
- Function : Author
L. B. Weinstein
- Function : Author
D. P. Weygand
- Function : Author
M. H. Wood
- Function : Author
N. Zachariou
- Function : Author
- PersonId : 760627
- ORCID : 0000-0001-7621-5612
J. Zhang
- Function : Author
Z. W. Zhao
- Function : Author
I. Zonta
- Function : Author
Abstract
We report the measurement of near threshold neutral pion electroproduction cross sections and the extraction of the associated structure functions on the proton in the kinematic range $Q^2$ from 2 to 4.5 GeV$^2$ and $W$ from 1.08 to 1.16 GeV. These measurements allow us to access the dominant pion-nucleon s-wave multipoles $E_{0+}$ and $S_{0+}$ in the near-threshold region. In the light-cone sum-rule framework (LCSR), these multipoles are related to the generalized form factors $G_1^{\pi^0 p}(Q^2)$ and $G_2^{\pi^0 p}(Q^2)$. The data are compared to these generalized form factors and the results for $G_1^{\pi^0 p}(Q^2)$ are found to be in good agreement with the LCSR predictions, but the level of agreement with $G_2^{\pi^0 p}(Q^2)$ is poor.