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Measurement of the cross section for hard exclusive π0 muoproduction on the proton
Authors
G. D. Alexeev
M. G. Alexeev
+202 more
A. Amoroso
V. Andrieux
N. V. Anfimov
V. Anosov
A. Antoshkin
K. Augsten
W. Augustyniak
C. D. R. Azevedo
B. Badełek
F. Balestra
M. Ball
J. Barth
R. Beck
Y. Bedfer
J. Bernhard
M. Bodlak
P. Bordalo
F. Bradamante
A. Bressan
V. E. Burtsev
M. Büchele
W.-C. Chang
C. Chatterjee
M. Chiosso
A. G. Chumakov
S.-U. Chung
A. Cicuttin
COMPASS Collaboration
M. L. Crespo
N. d'Hose
S. Dalla Torre
S. Dasgupta
S. S. Dasgupta
O. Yu. Denisov
L. Dhara
S. V. Donskov
N. Doshita
Ch. Dreisbach
N. du Fresne von Hohenesche
R. R. Dusaev
W. Dünnweber
A. Efremov
P. D. Eversheim
M. Faessler
A. Ferrero
Michael Finger Jr.
M. Finger
H. Fischer
C. Franco
J. M. Friedrich
V. Frolov
E. Fuchey
F. Gautheron
O. P. Gavrichtchouk
S. Gerassimov
J. Giarra
I. Gnesi
M. Gorzellik
A. Grasso
A. Gridin
M. Grosse-Perdekamp
B. Grube
A. Guskov
D. Hahne
G. Hamar
R. Heitz
F. Herrmann
N. Horikawa
C.-Y. Hsieh
S. Huber
S. Ishimoto
A. Ivanov
T. Iwata
M. Jandek
V. Jary
R. Joosten
K. Juraskova
P. Jörg
E. Kabuß
F. Kaspar
A. Kerbizi
B. Ketzer
G. V. Khaustov
Yu A. Khokhlov
Yu. Kisselev
F. Klein
J. H. Koivuniemi
V. N. Kolosov
K. Kondo Horikawa
I. Konorov
V. F. Konstantinov
A. M. Kotzinian
O. M. Kouznetsov
Z. Kral
F. Krinner
Z. V. Kroumchtein
M. Krämer
Y. Kulinich
F. Kunne
K. Kurek
R. P. Kurjata
A. Kveton
S. Levorato
Y.-S. Lian
J. Lichtenstadt
P.-J. Lin
R. Longo
V. E. Lyubovitskij
A. Maggiora
A. Magnon
N. Makins
N. Makke
G. K. Mallot
S. A. Mamon
B. Marianski
A. Martin
J. Marzec
J. Matoušek
T. Matsuda
G. V. Meshcheryakov
M. Meyer
W. Meyer
Yu V. Mikhailov
M. Mikhasenko
E. Mitrofanov
N. Mitrofanov
Y. Miyachi
A. Moretti
A. Nagaytsev
C. Naim
D. Neyret
J. Nový
W.-D. Nowak
G. Nukazuka
A. S. Nunes
A. G. Olshevsky
M. Ostrick
D. Panzieri
B. Parsamyan
S. Paul
J.-C. Peng
F. Pereira
D. V. Peshekhonov
M. Pešek
M. Pešková
N. Pierre
S. Platchkov
J. Pochodzalla
V. A. Polyakov
Jörg Pretz
M. Quaresma
C. Quintans
S. Ramos
C. Regali
G. Reicherz
C. Riedl
D. I. Ryabchikov
A. Rybnikov
A. Rychter
V. D. Samoylenko
A. Sandacz
S. Sarkar
I. A. Savin
G. Sbrizzai
H. Schmieden
A. Selyunin
L. Silva
L. Sinha
M. Slunecka
J. Smolik
A. Srnka
D. Steffen
M. Stolarski
O. Subrt
M. Sulc
H. Suzuki
A. Szabelski
T. Szameitat
P. Sznajder
S. Tessaro
F. Tessarotto
A. Thiel
J. Tomsa
F. Tosello
V. Tskhay
S. Uhl
B. I. Vasilishin
A. Vauth
B. M. Veit
J. Veloso
A. Vidon
M. Virius
D. von Harrach
M. Wagner
S. Wallner
M. Wilfert
K. Zaremba
P. Zavada
M. Zavertyaev
E. Zemlyanichkina
Y. Zhao
M. Ziembicki
Publication date
28 March 2019
Publisher
'Elsevier BV'
Doi
Cite
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on
arXiv
Abstract
202We report on a measurement of hard exclusive π0 muoproduction on the proton by COMPASS using 160 GeV/c polarised μ+ and μ− beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured μ+ and μ− cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range 0.08(GeV/c)2<|t|<0.64(GeV/c)2. The average kinematics of the measurement are 〈Q2〉=2.0(GeV/c)2, 〈ν〉=12.8GeV, 〈xBj〉=0.093 and 〈−t〉=0.256(GeV/c)2. Fitting the azimuthal dependence reveals a combined contribution by transversely and longitudinally polarised photons of (8.2±0.9stat−1.2+1.2|sys)nb/(GeV/c)2, as well as transverse-transverse and longitudinal-transverse interference contributions of (−6.1±1.3stat−0.7+0.7|sys)nb/(GeV/c)2 and (1.5±0.5stat−0.2+0.3|sys)nb/(GeV/c)2, respectively. Our results provide important input for modelling Generalised Parton Distributions. In the context of the phenomenological Goloskokov-Kroll model, the statistically significant transverse-transverse interference contribution constitutes clear experimental evidence for the chiral-odd GPD E‾T.openopenAlexeev M.G.; Alexeev G.D.; Amoroso A.; Andrieux V.; Anfimov N.V.; Anosov V.; Antoshkin A.; Augsten K.; Augustyniak W.; Azevedo C.D.R.; Badelek B.; Balestra F.; Ball M.; Barth J.; Beck R.; Bedfer Y.; Bernhard J.; Bodlak M.; Bordalo P.; Bradamante F.; Bressan A.; Buchele M.; Burtsev V.E.; Chang W.-C.; Chatterjee C.; Chiosso M.; Chumakov A.G.; Chung S.-U.; Cicuttin A.; Crespo M.L.; Dalla Torre S.; Dasgupta S.S.; Dasgupta S.; Denisov O.Y.; Dhara L.; Donskov S.V.; Doshita N.; Dreisbach C.; Dunnweber W.; Dusaev R.R.; Efremov A.; Eversheim P.D.; Faessler M.; Ferrero A.; Finger M.; Fischer H.; Franco C.; du Fresne von Hohenesche N.; Friedrich J.M.; Frolov V.; Fuchey E.; Gautheron F.; Gavrichtchouk O.P.; Gerassimov S.; Giarra J.; Gnesi I.; Gorzellik M.; Grasso A.; Gridin A.; Grosse Perdekamp M.; Grube B.; Guskov A.; Hahne D.; Hamar G.; von Harrach D.; Heitz R.; Herrmann F.; Horikawa N.; d'Hose N.; Hsieh C.-Y.; Huber S.; Ishimoto S.; Ivanov A.; Iwata T.; Jandek M.; Jary V.; Joosten R.; Jorg P.; Juraskova K.; Kabuss E.; Kaspar F.; Kerbizi A.; Ketzer B.; Khaustov G.V.; Khokhlov Y.A.; Kisselev Y.; Klein F.; Koivuniemi J.H.; Kolosov V.N.; Kondo Horikawa K.; Konorov I.; Konstantinov V.F.; Kotzinian A.M.; Kouznetsov O.M.; Kral Z.; Kramer M.; Krinner F.; Kroumchtein Z.V.; Kulinich Y.; Kunne F.; Kurek K.; Kurjata R.P.; Kveton A.; Levorato S.; Lian Y.-S.; Lichtenstadt J.; Lin P.-J.; Longo R.; Lyubovitskij V.E.; Maggiora A.; Magnon A.; Makins N.; Makke N.; Mallot G.K.; Mamon S.A.; Marianski B.; Martin A.; Marzec J.; Matousek J.; Matsuda T.; Meshcheryakov G.V.; Meyer M.; Meyer W.; Mikhailov Y.V.; Mikhasenko M.; Mitrofanov E.; Mitrofanov N.; Miyachi Y.; Moretti A.; Naim C.; Nagaytsev A.; Neyret D.; Novy J.; Nowak W.-D.; Nukazuka G.; Nunes A.S.; Olshevsky A.G.; Ostrick M.; Panzieri D.; Parsamyan B.; Paul S.; Peng J.-C.; Pereira F.; Pesek M.; Peshekhonov D.V.; Peskova M.; Pierre N.; Platchkov S.; Pochodzalla J.; Polyakov V.A.; Pretz J.; Quaresma M.; Quintans C.; Ramos S.; Regali C.; Reicherz G.; Riedl C.; Ryabchikov D.I.; Rybnikov A.; Rychter A.; Samoylenko V.D.; Sandacz A.; Sarkar S.; Savin I.A.; Sbrizzai G.; Schmieden H.; Selyunin A.; Silva L.; Sinha L.; Slunecka M.; Smolik J.; Srnka A.; Steffen D.; Stolarski M.; Subrt O.; Sulc M.; Suzuki H.; Szabelski A.; Szameitat T.; Sznajder P.; Tessaro S.; Tessarotto F.; Thiel A.; Tomsa J.; Tosello F.; Tskhay V.; Uhl S.; Vasilishin B.I.; Vauth A.; Veit B.M.; Veloso J.; Vidon A.; Virius M.; Wagner M.; Wallner S.; Wilfert M.; Zaremba K.; Zavada P.; Zavertyaev M.; Zemlyanichkina E.; Zhao Y.; Ziembicki M.Alexeev, M. G.; Alexeev, G. D.; Amoroso, A.; Andrieux, V.; Anfimov, N. V.; Anosov, V.; Antoshkin, A.; Augsten, K.; Augustyniak, W.; Azevedo, C. D. R.; Badelek, B.; Balestra, F.; Ball, M.; Barth, J.; Beck, R.; Bedfer, Y.; Bernhard, J.; Bodlak, M.; Bordalo, P.; Bradamante, F.; Bressan, A.; Buchele, M.; Burtsev, V. E.; Chang, W. -C.; Chatterjee, C.; Chiosso, M.; Chumakov, A. G.; Chung, S. -U.; Cicuttin, A.; Crespo, M. L.; Dalla Torre, S.; Dasgupta, S. S.; Dasgupta, S.; Denisov, O. Y.; Dhara, L.; Donskov, S. V.; Doshita, N.; Dreisbach, C.; Dunnweber, W.; Dusaev, R. R.; Efremov, A.; Eversheim, P. D.; Faessler, M.; Ferrero, A.; Finger, M.; Fischer, H.; Franco, C.; du Fresne von Hohenesche, N.; Friedrich, J. M.; Frolov, V.; Fuchey, E.; Gautheron, F.; Gavrichtchouk, O. P.; Gerassimov, S.; Giarra, J.; Gnesi, I.; Gorzellik, M.; Grasso, A.; Gridin, A.; Grosse Perdekamp, M.; Grube, B.; Guskov, A.; Hahne, D.; Hamar, G.; von Harrach, D.; Heitz, R.; Herrmann, F.; Horikawa, N.; D'Hose, N.; Hsieh, C. -Y.; Huber, S.; Ishimoto, S.; Ivanov, A.; Iwata, T.; Jandek, M.; Jary, V.; Joosten, R.; Jorg, P.; Juraskova, K.; Kabuss, E.; Kaspar, F.; Kerbizi, A.; Ketzer, B.; Khaustov, G. V.; Khokhlov, Y. A.; Kisselev, Y.; Klein, F.; Koivuniemi, J. H.; Kolosov, V. N.; Kondo Horikawa, K.; Konorov, I.; Konstantinov, V. F.; Kotzinian, A. M.; Kouznetsov, O. M.; Kral, Z.; Kramer, M.; Krinner, F.; Kroumchtein, Z. V.; Kulinich, Y.; Kunne, F.; Kurek, K.; Kurjata, R. P.; Kveton, A.; Levorato, S.; Lian, Y. -S.; Lichtenstadt, J.; Lin, P. -J.; Longo, R.; Lyubovitskij, V. E.; Maggiora, A.; Magnon, A.; Makins, N.; Makke, N.; Mallot, G. K.; Mamon, S. A.; Marianski, B.; Martin, A.; Marzec, J.; Matousek, J.; Matsuda, T.; Meshcheryakov, G. V.; Meyer, M.; Meyer, W.; Mikhailov, Y. V.; Mikhasenko, M.; Mitrofanov, E.; Mitrofanov, N.; Miyachi, Y.; Moretti, A.; Naim, C.; Nagaytsev, A.; Neyret, D.; Novy, J.; Nowak, W. -D.; Nukazuka, G.; Nunes, A. S.; Olshevsky, A. G.; Ostrick, M.; Panzieri, D.; Parsamyan, B.; Paul, S.; Peng, J. -C.; Pereira, F.; Pesek, M.; Peshekhonov, D. V.; Peskova, M.; Pierre, N.; Platchkov, S.; Pochodzalla, J.; Polyakov, V. A.; Pretz, J.; Quaresma, M.; Quintans, C.; Ramos, S.; Regali, C.; Reicherz, G.; Riedl, C.; Ryabchikov, D. I.; Rybnikov, A.; Rychter, A.; Samoylenko, V. D.; Sandacz, A.; Sarkar, S.; Savin, I. A.; Sbrizzai, G.; Schmieden, H.; Selyunin, A.; Silva, L.; Sinha, L.; Slunecka, M.; Smolik, J.; Srnka, A.; Steffen, D.; Stolarski, M.; Subrt, O.; Sulc, M.; Suzuki, H.; Szabelski, A.; Szameitat, T.; Sznajder, P.; Tessaro, S.; Tessarotto, F.; Thiel, A.; Tomsa, J.; Tosello, F.; Tskhay, V.; Uhl, S.; Vasilishin, B. I.; Vauth, A.; Veit, B. M.; Veloso, J.; Vidon, A.; Virius, M.; Wagner, M.; Wallner, S.; Wilfert, M.; Zaremba, K.; Zavada, P.; Zavertyaev, M.; Zemlyanichkina, E.; Zhao, Y.; Ziembicki, M
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