Spin density matrix elements in exclusive ρ0 meson muoproduction

被引：0

作者：

Alexeev, G. D. ^{[29
]}

Alexeev, M. G. ^{[19
,20
]}

Alice, C. ^{[19
,20
]}

Amoroso, A. ^{[19
,20
]}

Andrieux, V. ^{[31
]}

Anosov, V. ^{[29
]}

Augsten, K. ^{[4
]}

Augustyniak, W. ^{[24
]}

Azevedo, C. D. R. ^{[27
]}

Badelek, B. ^{[26
]}

Barth, J. ^{[8
]}

Beck, R. ^{[8
]}

Bedfer, Y. ^{[6
]}

Bernhard, J. ^{[11
,29
]}

Bodlak, M. ^{[5
]}

Bradamante, F. ^{[17
]}

Bressan, A. ^{[17
,18
]}

Burtsev, V. E. ^{[29
]}

Chang, W. -C. ^{[30
]}

Chatterjee, C. ^{[17
]}

Chiosso, M. ^{[19
,20
]}

Chumakov, A. G. ^{[29
]}

Chung, S. -U. ^{[12
,38
,39
]}

Cicuttin, A. ^{[16
,17
]}

Correia, P. M. M. ^{[27
]}

Crespo, M. L. ^{[16
,17
]}

D'Ago, D. ^{[17
,18
]}

Dalla Torre, S. ^{[17
]}

Dasgupta, S. S. ^{[14
]}

Dasgupta, S. ^{[17
,34
]}

Del Carro, F. ^{[19
,20
]}

Denisenko, I. ^{[29
]}

Denisov, O. Yu. ^{[19
]}

Donskov, S. V. ^{[29
]}

Doshita, N. ^{[23
]}

Dreisbach, Ch. ^{[12
]}

Duennweber, W.

Dusaev, R. R. ^{[29
]}

Ecker, D. ^{[12
]}

Efremov, A. ^{[29
]}

Eremeev, D. ^{[29
]}

Faccioli, P. ^{[28
]}

Faessler, M.

Finger, M. ^{[5
]}

Finger, M., Jr. ^{[5
]}

Fischer, H. ^{[10
]}

Floethner, K. J. ^{[8
]}

Florian, W. ^{[16
,17
]}

Friedrich, J. M. ^{[12
]}

Frolov, V. ^{[29
]}

机构：

[1] AI Alikhanyan Natl Sci Lab, 2 Alikhanyan Br St, Yerevan 0036, Armenia

[2] CAS, Inst Sci Instruments, Brno 61264, Czech Republic

[3] Tech Univ Liberec, Liberec 46117, Czech Republic

[4] Czech Tech Univ, Prague 16636, Czech Republic

[5] Charles Univ Prague, Fac Math & Phys, CR-12116 Prague, Czech Republic

[6] Univ Paris Saclay, CEA, IRFU, F-91191 Gif Sur Yvette, France

[7] Univ Bochum, Inst Expt Phys, D-44780 Bochum, Germany

[8] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[9] Univ Bonn, Phys Inst, D-53115 Bonn, Germany

[10] Univ Freiburg, Phys Inst, D-79104 Freiburg, Germany

[11] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[12] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany

[13] Ludwig Maximilians Univ Munchen, D-80539 Munich, Germany

[14] Matrivani Inst Expt Res & Educ, Kolkata 700030, W Bengal, India

[15] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[16] Abdus Salam Int Ctr Theoret Phys, I-34151 Trieste, Italy

[17] Trieste Sect INFN, I-34127 Trieste, Italy

[18] Univ Trieste, Dept Phys, I-34127 Trieste, Italy

[19] Torino Sect INFN, I-10125 Turin, Italy

[20] Univ Torino, Dept Phys, I-10125 Turin, Italy

[21] Univ Miyazaki, Miyazaki 8892192, Japan

[22] Nagoya Univ, Nagoya, Aichi 464, Japan

[23] Yamagata Univ, Yamagata 9928510, Japan

[24] Natl Ctr Nucl Res, PL-02093 Warsaw, Poland

[25] Warsaw Univ Technol, Inst Radioelect, PL-00665 Warsaw, Poland

[26] Univ Warsaw, Fac Phys, PL-02093 Warsaw, Poland

[27] Univ Aveiro, Dept Phys, I3N, P-3810193 Aveiro, Portugal

[28] LIP, P-1649003 Lisbon, Portugal

[29] CERN, CH-1211 Geneva 23, Switzerland

[30] Acad Sinica, Inst Phys, Taipei 11529, Taiwan

[31] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[32] ORIGINS Excellence Cluster, D-85748 Garching, Germany

[33] Univ Tubingen, Inst Theoret Phys, D-72076 Tubingen, Germany

[34] NISER, Ctr Med & Radiat Phys, Bubaneswar, India

[35] Univ Piemonte Orientale, I-15100 Alessandria, Italy

[36] Chubu Univ, Kasugai, Aichi 4878501, Japan

[37] KEK, 1-1 Oho, Tsukuba, Ibaraki 3050801, Japan

[38] Pusan Natl Univ, Dept Phys, Busan 609735, South Korea

[39] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[40] Natl Cent Univ, Dept Phys, 300 Jhongda Rd, Jhongli 32001, Taiwan

[41] Natl Kaohsiung Normal Univ, Dept Phys, Kaohsiung 824, Taiwan

来源：

EUROPEAN PHYSICAL JOURNAL C | 2023年 / 83卷 / 10期

关键词：

DIFFRACTIVE ELECTROPRODUCTION; VECTOR-MESONS; LEPTOPRODUCTION; DISTRIBUTIONS; HYDROGEN; PROTON;

D O I：

10.1140/epjc/s10052-023-11359-4

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive rho(0) meson muo-production at COMPASS using 160 GeV/c polarised mu(+) and mu-beams impinging on a liquid hydrogen target. The measurement covers the kinematic range 5.0 GeV/c(2) < W < 17.0 GeV/c(2), 1.0 (GeV/c)(2) < Q(2) < 10.0 (GeV/c)(2) and 0.01 (GeV/c)(2) < p(T)(2) < 0.5 (GeV/c)(2). Here, W denotes the mass of the final hadronic system,Q(2) the virtuality of the exchanged photon, and p(T) the transverse momentum of the rho(0) meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons (gamma(& lowast; )(T)-> V-L) indicate a violation of s-channel helicity conservation. Additionally, we observe a dominant contribution of natural-parity-exchange transitions and a very small contribution of unnatural-parity-exchange transitions, which is compatible with zero within experimental uncertainties. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they mayallow one to evaluate in a model-dependent way the role of parton helicity-flip GPDs in exclusive rho(0) production.

引用

页数：25

共 22 条

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