Measurement of the cross section for hard exclusive π0 muoproduction on the proton

M. G. Alexeev; G. D. Alexeev; A. Amoroso; V. Andrieux; N. V. Anfimov; V. Anosov; A. Antoshkin; K. Augsten; W. Augustyniak; C. D. R. Azevedo; B. Badelek; F. Balestra; M. Ball; J. Barth; R. Beck; Y. Bedfer; J. Bernhard; M. Bodlak; P. Bordalo; F. Bradamante; A. Bressan; M. Buchele; V. E. Burtsev; Chang W. -C.; C. Chatterjee; M. Chiosso; A. G. Chumakov; Chung S. -U.; A. Cicuttin; M. L. Crespo; Torre S. Dalla; S. S. Dasgupta; S. Dasgupta; O. Y. Denisov; L. Dhara; S. V. Donskov; N. Doshita; C. Dreisbach; W. Dunnweber; R. R. Dusaev; A. Efremov; P. D. Eversheim; M. Faessler; A. Ferrero; M. Finger; H. Fischer; C. Franco; Fresne von Hohenesche N. du; J. M. Friedrich; V. Frolov; E. Fuchey; F. Gautheron; O. P. Gavrichtchouk; S. Gerassimov; J. Giarra; I. Gnesi; M. Gorzellik; A. Grasso; A. Gridin; Perdekamp M. Grosse; B. Grube; A. Guskov; D. Hahne; G. Hamar; D. von Harrach; R. Heitz; F. Herrmann; N. Horikawa; N. d'Hose; Hsieh C. -Y.; S. Huber; S. Ishimoto; A. Ivanov; T. Iwata; M. Jandek; V. Jary; R. Joosten; P. Jorg; K. Juraskova; E. Kabuss; F. Kaspar; A. Kerbizi; B. Ketzer; G. V. Khaustov; Y. A. Khokhlov; Y. Kisselev; F. Klein; J. H. Koivuniemi; V. N. Kolosov; Horikawa K. Kondo; I. Konorov; V. F. Konstantinov; A. M. Kotzinian; O. M. Kouznetsov; Z. Kral; M. Kramer; F. Krinner; Z. V. Kroumchtein; Y. Kulinich; F. Kunne; K. Kurek; R. P. Kurjata; A. Kveton; S. Levorato; Lian Y. -S.; J. Lichtenstadt; Lin P. -J.; 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. Matousek; T. Matsuda; G. V. Meshcheryakov; M. Meyer; W. Meyer; Y. V. Mikhailov; M. Mikhasenko; E. Mitrofanov; N. Mitrofanov; Y. Miyachi; A. Moretti; C. Naim; A. Nagaytsev; D. Neyret; J. Novy; Nowak W. -D.; G. Nukazuka; A. S. Nunes; A. G. Olshevsky; M. Ostrick; Daniele PANZIERI; B. Parsamyan; S. Paul; Peng J. -C.; F. Pereira; M. Pesek; D. V. Peshekhonov; M. Peskova; N. Pierre; S. Platchkov; J. Pochodzalla; V. A. Polyakov; J. 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; M. Wagner; S. Wallner; M. Wilfert; K. Zaremba; P. Zavada; M. Zavertyaev; E. Zemlyanichkina; Y. Zhao; M. Ziembicki

doi:10.1016/j.physletb.2020.135454

Measurement of the cross section for hard exclusive π0 muoproduction on the proton

M. G. Alexeev, G. D. Alexeev, A. Amoroso, V. Andrieux, N. V. Anfimov, V. Anosov, A. Antoshkin, K. Augsten, W. Augustyniak, C. D. R. Azevedo, B. Badelek, F. Balestra, M. Ball, J. Barth, R. Beck, Y. Bedfer, J. Bernhard, M. Bodlak, P. Bordalo, F. BradamanteA. Bressan, M. Buchele, V. E. Burtsev, Chang W. -C., C. Chatterjee, M. Chiosso, A. G. Chumakov, Chung S. -U., A. Cicuttin, M. L. Crespo, Torre S. Dalla, S. S. Dasgupta, S. Dasgupta, O. Y. Denisov, L. Dhara, S. V. Donskov, N. Doshita, C. Dreisbach, W. Dunnweber, R. R. Dusaev, A. Efremov, P. D. Eversheim, M. Faessler, A. Ferrero, M. Finger, H. Fischer, C. Franco, Fresne von Hohenesche N. du, J. M. Friedrich, V. Frolov, E. Fuchey, F. Gautheron, O. P. Gavrichtchouk, S. Gerassimov, J. Giarra, I. Gnesi, M. Gorzellik, A. Grasso, A. Gridin, Perdekamp M. Grosse, B. Grube, A. Guskov, D. Hahne, G. Hamar, D. von Harrach, R. Heitz, F. Herrmann, N. Horikawa, N. d'Hose, Hsieh C. -Y., S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, M. Jandek, V. Jary, R. Joosten, P. Jorg, K. Juraskova, E. Kabuss, F. Kaspar, A. Kerbizi, B. Ketzer, G. V. Khaustov, Y. A. Khokhlov, Y. Kisselev, F. Klein, J. H. Koivuniemi, V. N. Kolosov, Horikawa K. Kondo, I. Konorov, V. F. Konstantinov, A. M. Kotzinian, O. M. Kouznetsov, Z. Kral, M. Kramer, F. Krinner, Z. V. Kroumchtein, Y. Kulinich, F. Kunne, K. Kurek, R. P. Kurjata, A. Kveton, S. Levorato, Lian Y. -S., J. Lichtenstadt, Lin P. -J., 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. Matousek, T. Matsuda, G. V. Meshcheryakov, M. Meyer, W. Meyer, Y. V. Mikhailov, M. Mikhasenko, E. Mitrofanov, N. Mitrofanov, Y. Miyachi, A. Moretti, C. Naim, A. Nagaytsev, D. Neyret, J. Novy, Nowak W. -D., G. Nukazuka, A. S. Nunes, A. G. Olshevsky, M. Ostrick, Daniele PANZIERI, B. Parsamyan, S. Paul, Peng J. -C., F. Pereira, M. Pesek, D. V. Peshekhonov, M. Peskova, N. Pierre, S. Platchkov, J. Pochodzalla, V. A. Polyakov, J. 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, M. Wagner, S. Wallner, M. Wilfert, K. Zaremba, P. Zavada, M. Zavertyaev, E. Zemlyanichkina, Y. Zhao, M. Ziembicki

Dipartimento di Scienze e Innovazione Tecnologica

Risultato della ricerca: Contributo su rivista › Articolo in rivista › peer review

Abstract

We 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.

Lingua originale	Inglese
pagine (da-a)	135454
Rivista	PHYSICS LETTERS. SECTION B
Volume	805
DOI	https://doi.org/10.1016/j.physletb.2020.135454
Stato di pubblicazione	Pubblicato - 2020

Keywords

COMPASS
Generalised Parton Distributions
Hard exclusive meson production
High Energy Physics - Experiment
Muoproduction
Quantum chromodynamics

Accesso al documento

10.1016/j.physletb.2020.135454

http://hdl.handle.net/11579/122650

Altri file e collegamenti

handle

Cita questo

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., ... Ziembicki, M. (2020). Measurement of the cross section for hard exclusive π0 muoproduction on the proton. PHYSICS LETTERS. SECTION B, 805, 135454. https://doi.org/10.1016/j.physletb.2020.135454

@article{66eb20c2272f45a981de43445e85dfcf,

title = "Measurement of the cross section for hard exclusive π0 muoproduction on the proton",

abstract = "We 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.",

keywords = "COMPASS, Generalised Parton Distributions, Hard exclusive meson production, High Energy Physics - Experiment, Muoproduction, Quantum chromodynamics, COMPASS, Generalised Parton Distributions, Hard exclusive meson production, High Energy Physics - Experiment, Muoproduction, Quantum chromodynamics",

author = "Alexeev, {M. G.} and Alexeev, {G. D.} and A. Amoroso and V. Andrieux and Anfimov, {N. V.} and V. Anosov and A. Antoshkin and K. Augsten and W. Augustyniak and Azevedo, {C. D. R.} and B. Badelek and F. Balestra and M. Ball and J. Barth and R. Beck and Y. Bedfer and J. Bernhard and M. Bodlak and P. Bordalo and F. Bradamante and A. Bressan and M. Buchele and Burtsev, {V. E.} and -C., {Chang W.} and C. Chatterjee and M. Chiosso and Chumakov, {A. G.} and -U., {Chung S.} and A. Cicuttin and Crespo, {M. L.} and Dalla, {Torre S.} and Dasgupta, {S. S.} and S. Dasgupta and Denisov, {O. Y.} and L. Dhara and Donskov, {S. V.} and N. Doshita and C. Dreisbach and W. Dunnweber and Dusaev, {R. R.} and A. Efremov and Eversheim, {P. D.} and M. Faessler and A. Ferrero and M. Finger and H. Fischer and C. Franco and du, {Fresne von Hohenesche N.} and Friedrich, {J. M.} and V. Frolov and E. Fuchey and F. Gautheron and Gavrichtchouk, {O. P.} and S. Gerassimov and J. Giarra and I. Gnesi and M. Gorzellik and A. Grasso and A. Gridin and Grosse, {Perdekamp M.} and B. Grube and A. Guskov and D. Hahne and G. Hamar and {von Harrach}, D. and R. Heitz and F. Herrmann and N. Horikawa and N. d'Hose and -Y., {Hsieh C.} and S. Huber and S. Ishimoto and A. Ivanov and T. Iwata and M. Jandek and V. Jary and R. Joosten and P. Jorg and K. Juraskova and E. Kabuss and F. Kaspar and A. Kerbizi and B. Ketzer and Khaustov, {G. V.} and Khokhlov, {Y. A.} and Y. Kisselev and F. Klein and Koivuniemi, {J. H.} and Kolosov, {V. N.} and Kondo, {Horikawa K.} and I. Konorov and Konstantinov, {V. F.} and Kotzinian, {A. M.} and Kouznetsov, {O. M.} and Z. Kral and M. Kramer and F. Krinner and Kroumchtein, {Z. V.} and Y. Kulinich and F. Kunne and K. Kurek and Kurjata, {R. P.} and A. Kveton and S. Levorato and -S., {Lian Y.} and J. Lichtenstadt and -J., {Lin P.} and R. Longo and Lyubovitskij, {V. E.} and A. Maggiora and A. Magnon and N. Makins and N. Makke and Mallot, {G. K.} and Mamon, {S. A.} and B. Marianski and A. Martin and J. Marzec and J. Matousek and T. Matsuda and Meshcheryakov, {G. V.} and M. Meyer and W. Meyer and Mikhailov, {Y. V.} and M. Mikhasenko and E. Mitrofanov and N. Mitrofanov and Y. Miyachi and A. Moretti and C. Naim and A. Nagaytsev and D. Neyret and J. Novy and -D., {Nowak W.} and G. Nukazuka and Nunes, {A. S.} and Olshevsky, {A. G.} and M. Ostrick and Daniele PANZIERI and B. Parsamyan and S. Paul and -C., {Peng J.} and F. Pereira and M. Pesek and Peshekhonov, {D. V.} and M. Peskova and N. Pierre and S. Platchkov and J. Pochodzalla and Polyakov, {V. A.} and J. Pretz and M. Quaresma and C. Quintans and S. Ramos and C. Regali and G. Reicherz and C. Riedl and Ryabchikov, {D. I.} and A. Rybnikov and A. Rychter and Samoylenko, {V. D.} and A. Sandacz and S. Sarkar and Savin, {I. A.} and G. Sbrizzai and H. Schmieden and A. Selyunin and L. Silva and L. Sinha and M. Slunecka and J. Smolik and A. Srnka and D. Steffen and M. Stolarski and O. Subrt and M. Sulc and H. Suzuki and A. Szabelski and T. Szameitat and P. Sznajder and S. Tessaro and F. Tessarotto and A. Thiel and J. Tomsa and F. Tosello and V. Tskhay and S. Uhl and Vasilishin, {B. I.} and A. Vauth and Veit, {B. M.} and J. Veloso and A. Vidon and M. Virius and M. Wagner and S. Wallner and M. Wilfert and K. Zaremba and P. Zavada and M. Zavertyaev and E. Zemlyanichkina and Y. Zhao and M. Ziembicki",

note = "Publisher Copyright: {\textcopyright} 2020 The Author(s)",

year = "2020",

doi = "10.1016/j.physletb.2020.135454",

language = "English",

volume = "805",

pages = "135454",

journal = "PHYSICS LETTERS. SECTION B",

issn = "0370-2693",

}

Alexeev, MG, Alexeev, GD, Amoroso, A, Andrieux, V, Anfimov, NV, Anosov, V, Antoshkin, A, Augsten, K, Augustyniak, W, Azevedo, CDR, 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, VE, -C., CW, Chatterjee, C, Chiosso, M, Chumakov, AG, -U., CS, Cicuttin, A, Crespo, ML, Dalla, TS, Dasgupta, SS, Dasgupta, S, Denisov, OY, Dhara, L, Donskov, SV, Doshita, N, Dreisbach, C, Dunnweber, W, Dusaev, RR, Efremov, A, Eversheim, PD, Faessler, M, Ferrero, A, Finger, M, Fischer, H, Franco, C, du, FVHN, Friedrich, JM, Frolov, V, Fuchey, E, Gautheron, F, Gavrichtchouk, OP, Gerassimov, S, Giarra, J, Gnesi, I, Gorzellik, M, Grasso, A, Gridin, A, Grosse, PM, Grube, B, Guskov, A, Hahne, D, Hamar, G, von Harrach, D, Heitz, R, Herrmann, F, Horikawa, N, d'Hose, N, -Y., HC, 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, GV, Khokhlov, YA, Kisselev, Y, Klein, F, Koivuniemi, JH, Kolosov, VN, Kondo, HK, Konorov, I, Konstantinov, VF, Kotzinian, AM, Kouznetsov, OM, Kral, Z, Kramer, M, Krinner, F, Kroumchtein, ZV, Kulinich, Y, Kunne, F, Kurek, K, Kurjata, RP, Kveton, A, Levorato, S, -S., LY, Lichtenstadt, J, -J., LP, Longo, R, Lyubovitskij, VE, Maggiora, A, Magnon, A, Makins, N, Makke, N, Mallot, GK, Mamon, SA, Marianski, B, Martin, A, Marzec, J, Matousek, J, Matsuda, T, Meshcheryakov, GV, Meyer, M, Meyer, W, Mikhailov, YV, Mikhasenko, M, Mitrofanov, E, Mitrofanov, N, Miyachi, Y, Moretti, A, Naim, C, Nagaytsev, A, Neyret, D, Novy, J, -D., NW, Nukazuka, G, Nunes, AS, Olshevsky, AG, Ostrick, M, PANZIERI, D, Parsamyan, B, Paul, S, -C., PJ, Pereira, F, Pesek, M, Peshekhonov, DV, Peskova, M, Pierre, N, Platchkov, S, Pochodzalla, J, Polyakov, VA, Pretz, J, Quaresma, M, Quintans, C, Ramos, S, Regali, C, Reicherz, G, Riedl, C, Ryabchikov, DI, Rybnikov, A, Rychter, A, Samoylenko, VD, Sandacz, A, Sarkar, S, Savin, IA, 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, BI, Vauth, A, Veit, BM, Veloso, J, Vidon, A, Virius, M, Wagner, M, Wallner, S, Wilfert, M, Zaremba, K, Zavada, P, Zavertyaev, M, Zemlyanichkina, E, Zhao, Y & Ziembicki, M 2020, 'Measurement of the cross section for hard exclusive π0 muoproduction on the proton', PHYSICS LETTERS. SECTION B, vol. 805, pagg. 135454. https://doi.org/10.1016/j.physletb.2020.135454

TY - JOUR

T1 - Measurement of the cross section for hard exclusive π0 muoproduction on the proton

AU - Alexeev, M. G.

AU - Alexeev, G. D.

AU - Amoroso, A.

AU - Andrieux, V.

AU - Anfimov, N. V.

AU - Anosov, V.

AU - Antoshkin, A.

AU - Augsten, K.

AU - Augustyniak, W.

AU - Azevedo, C. D. R.

AU - Badelek, B.

AU - Balestra, F.

AU - Ball, M.

AU - Barth, J.

AU - Beck, R.

AU - Bedfer, Y.

AU - Bernhard, J.

AU - Bodlak, M.

AU - Bordalo, P.

AU - Bradamante, F.

AU - Bressan, A.

AU - Buchele, M.

AU - Burtsev, V. E.

AU - -C., Chang W.

AU - Chatterjee, C.

AU - Chiosso, M.

AU - Chumakov, A. G.

AU - -U., Chung S.

AU - Cicuttin, A.

AU - Crespo, M. L.

AU - Dalla, Torre S.

AU - Dasgupta, S. S.

AU - Dasgupta, S.

AU - Denisov, O. Y.

AU - Dhara, L.

AU - Donskov, S. V.

AU - Doshita, N.

AU - Dreisbach, C.

AU - Dunnweber, W.

AU - Dusaev, R. R.

AU - Efremov, A.

AU - Eversheim, P. D.

AU - Faessler, M.

AU - Ferrero, A.

AU - Finger, M.

AU - Fischer, H.

AU - Franco, C.

AU - du, Fresne von Hohenesche N.

AU - Friedrich, J. M.

AU - Frolov, V.

AU - Fuchey, E.

AU - Gautheron, F.

AU - Gavrichtchouk, O. P.

AU - Gerassimov, S.

AU - Giarra, J.

AU - Gnesi, I.

AU - Gorzellik, M.

AU - Grasso, A.

AU - Gridin, A.

AU - Grosse, Perdekamp M.

AU - Grube, B.

AU - Guskov, A.

AU - Hahne, D.

AU - Hamar, G.

AU - von Harrach, D.

AU - Heitz, R.

AU - Herrmann, F.

AU - Horikawa, N.

AU - d'Hose, N.

AU - -Y., Hsieh C.

AU - Huber, S.

AU - Ishimoto, S.

AU - Ivanov, A.

AU - Iwata, T.

AU - Jandek, M.

AU - Jary, V.

AU - Joosten, R.

AU - Jorg, P.

AU - Juraskova, K.

AU - Kabuss, E.

AU - Kaspar, F.

AU - Kerbizi, A.

AU - Ketzer, B.

AU - Khaustov, G. V.

AU - Khokhlov, Y. A.

AU - Kisselev, Y.

AU - Klein, F.

AU - Koivuniemi, J. H.

AU - Kolosov, V. N.

AU - Kondo, Horikawa K.

AU - Konorov, I.

AU - Konstantinov, V. F.

AU - Kotzinian, A. M.

AU - Kouznetsov, O. M.

AU - Kral, Z.

AU - Kramer, M.

AU - Krinner, F.

AU - Kroumchtein, Z. V.

AU - Kulinich, Y.

AU - Kunne, F.

AU - Kurek, K.

AU - Kurjata, R. P.

AU - Kveton, A.

AU - Levorato, S.

AU - -S., Lian Y.

AU - Lichtenstadt, J.

AU - -J., Lin P.

AU - Longo, R.

AU - Lyubovitskij, V. E.

AU - Maggiora, A.

AU - Magnon, A.

AU - Makins, N.

AU - Makke, N.

AU - Mallot, G. K.

AU - Mamon, S. A.

AU - Marianski, B.

AU - Martin, A.

AU - Marzec, J.

AU - Matousek, J.

AU - Matsuda, T.

AU - Meshcheryakov, G. V.

AU - Meyer, M.

AU - Meyer, W.

AU - Mikhailov, Y. V.

AU - Mikhasenko, M.

AU - Mitrofanov, E.

AU - Mitrofanov, N.

AU - Miyachi, Y.

AU - Moretti, A.

AU - Naim, C.

AU - Nagaytsev, A.

AU - Neyret, D.

AU - Novy, J.

AU - -D., Nowak W.

AU - Nukazuka, G.

AU - Nunes, A. S.

AU - Olshevsky, A. G.

AU - Ostrick, M.

AU - PANZIERI, Daniele

AU - Parsamyan, B.

AU - Paul, S.

AU - -C., Peng J.

AU - Pereira, F.

AU - Pesek, M.

AU - Peshekhonov, D. V.

AU - Peskova, M.

AU - Pierre, N.

AU - Platchkov, S.

AU - Pochodzalla, J.

AU - Polyakov, V. A.

AU - Pretz, J.

AU - Quaresma, M.

AU - Quintans, C.

AU - Ramos, S.

AU - Regali, C.

AU - Reicherz, G.

AU - Riedl, C.

AU - Ryabchikov, D. I.

AU - Rybnikov, A.

AU - Rychter, A.

AU - Samoylenko, V. D.

AU - Sandacz, A.

AU - Sarkar, S.

AU - Savin, I. A.

AU - Sbrizzai, G.

AU - Schmieden, H.

AU - Selyunin, A.

AU - Silva, L.

AU - Sinha, L.

AU - Slunecka, M.

AU - Smolik, J.

AU - Srnka, A.

AU - Steffen, D.

AU - Stolarski, M.

AU - Subrt, O.

AU - Sulc, M.

AU - Suzuki, H.

AU - Szabelski, A.

AU - Szameitat, T.

AU - Sznajder, P.

AU - Tessaro, S.

AU - Tessarotto, F.

AU - Thiel, A.

AU - Tomsa, J.

AU - Tosello, F.

AU - Tskhay, V.

AU - Uhl, S.

AU - Vasilishin, B. I.

AU - Vauth, A.

AU - Veit, B. M.

AU - Veloso, J.

AU - Vidon, A.

AU - Virius, M.

AU - Wagner, M.

AU - Wallner, S.

AU - Wilfert, M.

AU - Zaremba, K.

AU - Zavada, P.

AU - Zavertyaev, M.

AU - Zemlyanichkina, E.

AU - Zhao, Y.

AU - Ziembicki, M.

PY - 2020

Y1 - 2020

N2 - We 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.

AB - We 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.

KW - COMPASS

KW - Generalised Parton Distributions

KW - Hard exclusive meson production

KW - High Energy Physics - Experiment

KW - Muoproduction

KW - Quantum chromodynamics

KW - COMPASS

KW - Generalised Parton Distributions

KW - Hard exclusive meson production

KW - High Energy Physics - Experiment

KW - Muoproduction

KW - Quantum chromodynamics

UR - https://iris.uniupo.it/handle/11579/122650

U2 - 10.1016/j.physletb.2020.135454

DO - 10.1016/j.physletb.2020.135454

M3 - Article

SN - 0370-2693

VL - 805

SP - 135454

JO - PHYSICS LETTERS. SECTION B

JF - PHYSICS LETTERS. SECTION B

ER -

Measurement of the cross section for hard exclusive π0 muoproduction on the proton

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