Springer : Spin density matrix elements in exclusive $\rho ^0$ meson muoproduction

Alexeev, G.D.; Eremeev, D.; Dünnweber, W.; Hoffmann, M.; Mamon, S.A.; Kunne, F.; Augustyniak, W.; Riedl, C.; Bernhard, J.; Thiel, A.; Crespo, M.L.; Matsuda, T.; Koivuniemi, J.H.; Schmieden, H.; Samoylenko, V.D.; Quaresma, M.; Gautheron, F.; Lyubovitskij, V.E.; Tessarotto, F.; Kolosov, V.N.; Marzec, J.; Horikawa, N.; Lian, Y.-S.; Olshevsky, A.G.; Gorzellik, M.; Nukazuka, G.; Parsamyan, B.; Chumakov, A.G.; Flöthner, K.J.; Burtsev, V.E.; Rymbekova, A.; Ordòñez, L.G. Garcia; Grüner, M.; Ryabchikov, D.I.; Makins, N.; Platchkov, S.; Kerbizi, A.; Savin, I.A.; Moretti, A.; Bodlak, M.; Peshekhonov, D.V.; Miura, D.; Klein, F.; Augsten, K.; Alice, C.; Krinner, F.; Sinha, L.; Guskov, A.; Koval, A.; Ecker, D.; Virius, M.; Miyachi, Y.; Naim, C.; Cicuttin, A.; Andrieux, V.; Maggiora, A.; Kurek, K.; Ostrick, M.; Bradamante, F.; Makke, N.; Rychter, A.; Barth, J.; Bedfer, Y.; Mikhailov, Yu. V.; Kondo Horikawa, K.; Denisov, O.Yu.; Mallot, G.K.; Spülbeck, D.; Konorov, I.; Beck, R.; Metzger, F.; Donskov, S.V.; Ryva, A.; Kabuß, E.; Srnka, A.; Faccioli, P.; Azevedo, C.D. R.; Meyer, M.; Korzenev, A.M.; Del Carro, F.; Florian, W.; Gavrichtchouk, O.P.; Nowak, W.-D.; D'Ago, D.; Giarra, J.; Grube, B.; Correia, P.M. M.; Pires, C. Menezes; Panzieri, D.; Dasgupta, S.S.; Chung, S.-U.; Chatterjee, C.; Dalla Torre, S.; Mitrofanov, E.; Lichtenstadt, J.; Ventura, B.; Badelek, B.; Khaustov, G.V.; Sbrizzai, G.; Ivanov, A.; Martin, A.; Mattson, G.; Kurjata, R.P.; Molina, R.; Ziembicki, M.; Levorato, S.; Jary, V.; Tskhay, V.; Grasso, A.; Subrt, O.; Townsend, A.; Sarkar, S.; Mikhasenko, M.; Sandacz, A.; Gerassimov, S.; Kveton, A.; Magnon, A.; Stolarski, M.; Niemiec, M.; Efremov, A.; Zemko, M.; Tomsa, J.; Dreisbach, Ch.; Wagner, M.; Faessler, M.; von Harrach, D.; Amoroso, A.; Quintans, C.; Finger, M.; Maltsev, A.; Kouznetsov, O.M.; Alexeev, M.G.; Sulc, M.; Giordano, D.; Valinoti, B.; Lin, P.-J.; Gridin, A.; Doshita, N.; Sharko, K.; Bressan, A.; Fischer, H.; Dusaev, R.R.; Ishimoto, S.; Grosse Perdekamp, M.; Paul, S.; Lavickova, K.; Zaremba, K.; Dasgupta, S.; Matoušek, J.; Chang, W.-C.; Nagaytsev, A.; Kral, Z.; Zemlyanichkina, E.; Anosov, V.; Selyunin, A.; Frolov, V.; Kaspar, F.; Iwata, T.; Ketzer, B.; Tosello, F.; Veit, B.M.; Khatun, A.; Reicherz, G.; Konstantinov, V.F.; Meyer, W.; Hsieh, C.-Y.; Kotzinian, A.M.; Jandek, M.; Friedrich, J.M.; Suzuki, H.; Pochodzalla, J.; d'Hose, N.; Polyakov, V.A.; Pekeler, H.; Nový, J.; Neyret, D.; Denisenko, I.; Joosten, R.; Pešková, M.; Triloki, T.; Zavertyaev, M.; Longo, R.; Peng, J.-C.; jr., M.Finger; Slunecka, M.; Tessaro, S.; Pešek, M.; Veloso, J.F. C.A.; Huber, S.; Chiosso, M.; Wallner, S.

doi:10.1140/epjc/s10052-023-11359-4

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Report number	arXiv:2210.16932 ; CERN-EP-2022-231
Title	Spin density matrix elements in exclusive $\rho ^0$ meson muoproduction
Author(s)	Alexeev, G.D. (Unlisted) ; Alexeev, M.G. (INFN, Turin) ; Alice, C. (INFN, Turin) ; Amoroso, A. (INFN, Turin) ; Andrieux, V. (Illinois U., Urbana) ; Anosov, V. (Unlisted) ; Augsten, K. (Prague, Tech. U.) ; Augustyniak, W. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Azevedo, C.D. R. (Aveiro U.) ; Badelek, B. (Warsaw U.) ; Barth, J. (Bonn U., HISKP) ; Beck, R. (Bonn U., HISKP) ; Bedfer, Y. (IRFU, Saclay) ; Bernhard, J. (Mainz U., Inst. Kernphys. ; CERN) ; Bodlak, M. (Charles U.) ; Bradamante, F. (INFN, Trieste) ; Bressan, A. (INFN, Trieste) ; Burtsev, V.E. (Unlisted) ; Chang, W.-C. (Taiwan, Inst. Phys.) ; Chatterjee, C. (INFN, Trieste) ; Chiosso, M. (INFN, Turin) ; Chumakov, A.G. (Unlisted) ; Chung, S.-U. (Munich, Tech. U.) ; Cicuttin, A. (ICTP, Trieste ; INFN, Trieste) ; Correia, P.M. M. (Aveiro U.) ; Crespo, M.L. (ICTP, Trieste ; INFN, Trieste) ; D'Ago, D. (INFN, Trieste) ; Dalla Torre, S. (INFN, Trieste) ; Dasgupta, S.S. (Saha Inst.) ; Dasgupta, S. (INFN, Trieste) ; Del Carro, F. (INFN, Turin) ; Denisenko, I. (Unlisted) ; Denisov, O.Yu. (INFN, Turin) ; Donskov, S.V. (Unlisted) ; Doshita, N. (Yamagata U.) ; Dreisbach, Ch. (Munich, Tech. U.) ; Dünnweber, W. (LMU Munich (main)) ; Dusaev, R.R. (Unlisted) ; Ecker, D. (Munich, Tech. U.) ; Efremov, A. (Unlisted) ; Eremeev, D. (Unlisted) ; Faccioli, P. (LIP, Lisbon) ; Faessler, M. (LMU Munich (main)) ; Finger, M. (Charles U.) ; jr., M.Finger (Charles U.) ; Fischer, H. (Freiburg U.) ; Flöthner, K.J. (Bonn U., HISKP) ; Florian, W. (ICTP, Trieste ; INFN, Trieste) ; Friedrich, J.M. (Munich, Tech. U.) ; Frolov, V. (Unlisted ; CERN) ; Ordòñez, L.G. Garcia (ICTP, Trieste ; INFN, Trieste) ; Gautheron, F. (Ruhr U., Bochum ; Illinois U., Urbana) ; Gavrichtchouk, O.P. (Unlisted) ; Gerassimov, S. (Munich, Tech. U. ; Unlisted) ; Giarra, J. (Mainz U., Inst. Kernphys.) ; Giordano, D. (INFN, Turin) ; Gorzellik, M. (Freiburg U.) ; Grasso, A. (INFN, Turin) ; Gridin, A. (Unlisted) ; Grosse Perdekamp, M. (Illinois U., Urbana) ; Grube, B. (Munich, Tech. U.) ; Grüner, M. (Bonn U., HISKP) ; Guskov, A. (Unlisted) ; von Harrach, D. (Mainz U., Inst. Kernphys.) ; Hoffmann, M. (Bonn U., HISKP) ; Horikawa, N. (Nagoya U.) ; d'Hose, N. (IRFU, Saclay) ; Hsieh, C.-Y. (Taiwan, Inst. Phys.) ; Huber, S. (Munich, Tech. U.) ; Ishimoto, S. (Yamagata U.) ; Ivanov, A. (Unlisted) ; Iwata, T. (Yamagata U.) ; Jandek, M. (Prague, Tech. U.) ; Jary, V. (Prague, Tech. U.) ; Joosten, R. (Bonn U., HISKP) ; Kabuß, E. (Mainz U., Inst. Kernphys.) ; Kaspar, F. (Munich, Tech. U.) ; Kerbizi, A. (INFN, Trieste) ; Ketzer, B. (Bonn U., HISKP) ; Khatun, A. (IRFU, Saclay) ; Khaustov, G.V. (Unlisted) ; Klein, F. (Bonn U.) ; Koivuniemi, J.H. (Ruhr U., Bochum ; Illinois U., Urbana) ; Kolosov, V.N. (Unlisted) ; Kondo Horikawa, K. (Yamagata U.) ; Konorov, I. (Munich, Tech. U. ; Unlisted) ; Konstantinov, V.F. (Unlisted) ; Korzenev, A.M. (Unlisted) ; Kotzinian, A.M. (Yerevan Phys. Inst. ; INFN, Turin) ; Kouznetsov, O.M. (Unlisted) ; Koval, A. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Kral, Z. (Charles U.) ; Krinner, F. (Munich, Tech. U.) ; Kunne, F. (IRFU, Saclay) ; Kurek, K. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Kurjata, R.P. (Warsaw U. of Tech.) ; Kveton, A. (Charles U.) ; Lavickova, K. (Prague, Tech. U.) ; Levorato, S. (INFN, Trieste ; CERN) ; Lian, Y.-S. (Taiwan, Inst. Phys.) ; Lichtenstadt, J. (Tel Aviv U.) ; Lin, P.-J. (IRFU, Saclay) ; Longo, R. (Illinois U., Urbana) ; Lyubovitskij, V.E. (Unlisted) ; Maggiora, A. (INFN, Turin) ; Magnon, A. (Saha Inst.) ; Makins, N. (Illinois U., Urbana) ; Makke, N. (INFN, Trieste) ; Mallot, G.K. (Freiburg U. ; CERN) ; Maltsev, A. (Unlisted) ; Mamon, S.A. (Unlisted) ; Martin, A. (INFN, Trieste) ; Marzec, J. (Warsaw U. of Tech.) ; Matoušek, J. (Charles U.) ; Matsuda, T. (Miyazaki U.) ; Mattson, G. (Illinois U., Urbana) ; Pires, C. Menezes (LIP, Lisbon) ; Metzger, F. (Bonn U., HISKP) ; Meyer, M. (IRFU, Saclay ; Illinois U., Urbana) ; Meyer, W. (Ruhr U., Bochum) ; Mikhailov, Yu. V. (Unlisted) ; Mikhasenko, M. (LMU Munich (main)) ; Mitrofanov, E. (Unlisted) ; Miura, D. (Yamagata U.) ; Miyachi, Y. (Yamagata U.) ; Molina, R. (ICTP, Trieste ; INFN, Trieste) ; Moretti, A. (INFN, Trieste) ; Nagaytsev, A. (Unlisted) ; Naim, C. (IRFU, Saclay) ; Neyret, D. (IRFU, Saclay) ; Niemiec, M. (Warsaw U.) ; Nový, J. (Prague, Tech. U.) ; Nowak, W.-D. (Mainz U., Inst. Kernphys.) ; Nukazuka, G. (Yamagata U.) ; Olshevsky, A.G. (Unlisted) ; Ostrick, M. (Mainz U., Inst. Kernphys.) ; Panzieri, D. (INFN, Turin) ; Parsamyan, B. (Yerevan Phys. Inst. ; INFN, Turin) ; Paul, S. (Munich, Tech. U.) ; Pekeler, H. (Bonn U., HISKP) ; Peng, J.-C. (Illinois U., Urbana) ; Pešek, M. (Charles U.) ; Peshekhonov, D.V. (Unlisted) ; Pešková, M. (Charles U.) ; Platchkov, S. (IRFU, Saclay) ; Pochodzalla, J. (Mainz U., Inst. Kernphys.) ; Polyakov, V.A. (Unlisted) ; Quaresma, M. (LIP, Lisbon) ; Quintans, C. (LIP, Lisbon) ; Reicherz, G. (Ruhr U., Bochum) ; Riedl, C. (Illinois U., Urbana) ; Ryabchikov, D.I. (Munich, Tech. U. ; Unlisted) ; Rychter, A. (Warsaw U. of Tech.) ; Rymbekova, A. ; Ryva, A. (Unlisted) ; Samoylenko, V.D. (Unlisted) ; Sandacz, A. (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Sarkar, S. (Saha Inst.) ; Savin, I.A. (Unlisted) ; Sbrizzai, G. (INFN, Trieste) ; Schmieden, H. (Bonn U.) ; Selyunin, A. (Unlisted) ; Sharko, K. (Unlisted) ; Sinha, L. (Saha Inst.) ; Slunecka, M. (Charles U. ; Unlisted) ; Spülbeck, D. (Bonn U., HISKP) ; Srnka, A. (Inst. Sci. Instruments, Brno) ; Stolarski, M. (LIP, Lisbon) ; Subrt, O. (Prague, Tech. U. ; CERN) ; Sulc, M. (Liberec Tech. U.) ; Suzuki, H. (Yamagata U.) ; Tessaro, S. (INFN, Trieste) ; Tessarotto, F. (INFN, Trieste ; CERN) ; Thiel, A. (Bonn U., HISKP) ; Tomsa, J. (Charles U.) ; Tosello, F. (INFN, Turin) ; Townsend, A. (Illinois U., Urbana) ; Triloki, T. (INFN, Trieste) ; Tskhay, V. (Unlisted) ; Valinoti, B. (ICTP, Trieste ; INFN, Trieste) ; Veit, B.M. (Mainz U., Inst. Kernphys.) ; Veloso, J.F. C.A. (Aveiro U.) ; Ventura, B. (IRFU, Saclay) ; Virius, M. (Prague, Tech. U.) ; Wagner, M. (Bonn U., HISKP) ; Wallner, S. (Munich, Tech. U.) ; Zaremba, K. (Warsaw U. of Tech.) ; Zavertyaev, M. (Unlisted) ; Zemko, M. (Prague, Tech. U. ; Charles U.) ; Zemlyanichkina, E. (Unlisted) ; Ziembicki, M. (Warsaw U. of Tech.)
Corporate author(s)	The COMPASS collaboration
Publication	2023-10-13
Imprint	31 Oct 2022
Number of pages	32
Published in:	Eur. Phys. J. C 83 (2023) 924
DOI	10.1140/epjc/s10052-023-11359-4
Subject category	Particle Physics - Experiment ; Particle Physics - Phenomenology
Accelerator/Facility, Experiment	CERN SPS ; COMPASS / NA58
Keywords	QCD ; hard scattering ; experimental results
Abstract	We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $\rho ^0$ meson muoproduction 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/$c$)$^2$ $< p_{\rm{T}}^2 <$ 0.5 (GeV/$c$)$^2$. Here, $W$ denotes the mass of the final hadronic system, $Q^2$ the virtuality of the exchanged photon, and $p_{\rm{T}}$ 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 ($\gamma^*_T \to V^{ }_L$) 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 may allow one to evaluate in a model-dependent way the role of parton helicity-flip GPDs in exclusive $\rho ^0$ production.
Other source	Inspire
Copyright/License	Publication: © 2023-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³ Preprint: © 2022-2024 CERN (Licenses: CC-BY-4.0, arXiv nonexclusive-distrib 1.0)
Submitted by	[email protected]

$Definition of angles in the process $\mu N \to \mu' N' \rho ^0$ with $\rho ^0 \to \pi^+ \pi^- $. Here, $\Phi$ is the angle between the $\rho ^0$ production plane and the lepton scattering plane in the centre-of-mass system of the virtual photon and the target nucleon, while $\phi$ is the angle between the $\rho ^0$ production and decay planes. The variable $\Theta$ is the polar angle of the decay $\pi ^+$ in the $\rho ^0$ meson rest frame.$ $Definition of angles in the process $\mu N \to \mu' N' \rho ^0$ with $\rho ^0 \to \pi^+ \pi^- $. Here, $\Phi$ is the angle between the $\rho ^0$ production plane and the lepton scattering plane in the centre-of-mass system of the virtual photon and the target nucleon, while $\phi$ is the angle between the $\rho ^0$ production and decay planes. The variable $\Theta$ is the polar angle of the decay $\pi ^+$ in the $\rho ^0$ meson rest frame.$ $\small{ Distribution of the $\pi ^+ \pi ^-$ invariant mass for experimental data (shaded histogram) and HEPGEN MC (open histogram). The invariant mass distribution from HEPGEN is normalised to the data in the region 0.75 GeV/$c^2$ < $M_{\pi^{+}\pi^{-}}$ < 0.77 GeV/$c^2$. The vertical lines indicate the applied limits. }$ Show more plots

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