New analysis of ηπ tensor resonances measured at the COMPASS experiment

Jackura, A.; Fernández-Ramírez, C.; Pilloni, A.; Mathieu, V.; Nys, Jannes; Pauk, Vladyslav; Szczepaniak, Adam P.; Fox, Geoffrey; Aghasyan, M.; Akhunzyanov, R.; Alexeev, M.; Alexeev, G. D.; Amoroso, A.; Andrieux, V.; Анфимов, Н.; Аносов, В.; Antoshkin, A.; Augsten, K.; Augustyniak, W.; Austregesilo, A.; Azevedo, C.D.R.; Badełek, B.; Balestra, F.; Ball, M.; Barth, J.; Beck, R.; Bedfer, Y.; Bernhard, J.; Bicker, K.; Bielert, E.R.; Birsa, R.; Bodlak, M.; Bordalo, P.; Bradamante, F.; Bressan, A.; Büchele, M.; Burtsev, V.E.; Chang, W. C.; Chatterjee, C.; Chiosso, M.; Choi, I. J.; Chumakov, A.G.; Chung, S. U.; Cicuttin, A.; Crespo, M.L.; Torre, S.; Dasgupta, S.; Денисов, О.; Dhara, L.; Donskov, S.V.; Doshita, N.; Dreisbach, Ch.; Dünnweber, W.; Dusaev, R. R.; Dziewiecki, M.; Efremov, A.; Eversheim, P.D.; Faessler, M.; Ferrero, A.; Finger, M.; Fischer, H.; Franco, C.; Hohenesche, N. du Fresne von; Jm, Friedrich; Frolov, V. V.; Fuchey, E.; Gautheron, F.; Gavrichtchouk, O.P.; Gerassimov, S.; Giarra, J.; Giordano, F.; Gnesi, I.; Gorzellik, M.; Grasso, A.; Perdekamp, M. Grosse; Grube, B.; Grussenmeyer, T.; Guskov, A.; Hahne, D.; Hamar, G.; Harrach, D. von; Heinsius, F. H.; Heitz, R.; Herrmann, F.; Horikawa, N.; d’Hose, N.; Hsieh, C.-Y.; Huber, S.; Ishimoto, S.; Иванов, А.; Ivanshin, Yu.; Iwata, T.; Jarý, V.; Joosten, R.; Jörg, P.; Kabuß, E.; Kerbizi, A.; Ketzer, B.; Khaustov, G.V.; Khokhlov, Yu.A.; Kisselev, Yu.; Klein, F.; Koivuniemi, J.H.; Kolosov, V.N.; Kondo, K.; Königsmann, K.; Konorov, I.; Константинов, В.Ф.; Kotzinian, A.M.; Kouznetsov, O.; Král, Zdeněk; Krämer, M.; Kremser, P.; Krinner, F.; Kroumchtein, Z.V.; Kulinich, Y. P.; Kunne, F.; Kurek, K.; Kurjata, R.; Kuznetsov, Ivan; Kveton, A.; Lednev, A.A.; Levchenko, E.A.; Levillain, M.; Levorato, S.; Lian, Y.-S.; Lichtenstadt, J.; Longo, Riccardo; Lyubovitskij, Valery E.; Maggiora, A.; Magnon, A.; Makins, N.; Makke, N.; Mallot, G.K.; Mamon, S.A.; Mariański, B.; Martin, A.; Marzec, J.; Matoušek, Jan; Matsuda, Hiroki; Matsuda, T.; Meshcheryakov, G.; Meyer, M.; Meyer, W.; Mikhailov, Yu.V.; Mikhasenko, M.; Mitrofanov, E.; Mitrofanov, N.; Miyachi, Y.; Nagaytsev, A.; Nerling, F.; Neyret, D.; Nový, J.; Nowak, W.-D.; Nukazuka, G.; Nunes, A. S.; Оlshevsky, А.G.; Орлов, И.; Ostrick, M.; Panzieri, D.; Parsamyan, B.; Paul, S.; Peng, J.-C.; Pereira, F.; Pešek, M.; Pešková, M.; Peshekhonov, D.V.; Pierre, N.; Platchkov, S.; Pochodzalla, J.; Polyakov, V.A.; Pretz, J.; Quaresma, M.; Quintans, C.; Ramos, S.; Regali, C.; Reicherz, G.; Riedl, C.; Rogacheva, N.S.; Ryabchikov, D.I.; Рыбников, А.; Rychter, A.; Salac, R.; Samoylenko, V.D.; Sandacz, A.; Santos, C.; Sarkar, S.; Savin, I.; Sawada, T.; Sbrizzai, G.; Schiavon, P.; Schlüter, T.; Schmidt, K.; Schmieden, H.; Schönning, K.; Seder, E.; Selyunin, A.; Silva, L.; Sinha, L.; Sirtl, S.; Slunečka, M.; Smolík, J.; Srnka, A.; Steffen, D.; Stolarski, M.; Subrt, O.; Šulc, M.; Suzuki, Hiromasa; Szabelski, A.; Szameitat, T.; Sznajder, P.; Taševský, M.; Tessaro, S.; Tessarotto, F.; Thiel, A.; Tomsa, J.; Tosello, F.; Tskhay, V.; Uhl, S.; Vasilishin, B. I.; Vauth, A.; Veloso, J.F.C.A.; Vidon, A.; Virius, M.; Wallner, S.; Weisrock, T.; Wilfert, M.; Wolbeek, J. ter; Заремба, К.; Závada, P.; Zavertyaev, M.; Zemlyanichkina, E.; Zhuravlev, N.; Ziembicki, M.

doi:10.1016/j.physletb.2018.01.017

Cited by 20 publications

(41 citation statements)

References 34 publications

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“…Since the Deck mechanism is not fully accounted for in the COMPASS amplitude model, we do not include the 3π data in our analysis. As discussed in [40], neglecting additional channels does not affect the pole position, as long as the resonance poles are far away from threshold, which is the case studied here.…”

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confidence: 87%

“…In [40] we analyzed the spectrum of the ηπ D-wave extracted from the COMPASS data. In this Letter, we extend the mass dependent study to the exotic P -wave, and present results of the first coupled-channel analysis of the η ( ) π COMPASS data.…”

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confidence: 99%

“…However, the approximately constant hadron cross section at high energies implies that the effective spin of the Pomeron is near one, which explains dominance of the partial wave components with angular momentum projection M = ±1 as seen in data [33,49,50]. Since the two are related by parity, we drop reference to the Pomeron quantum numbers (for more details, see [40]). As discussed previously, we fix an effective value t eff = −0.1 GeV 2 .…”

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confidence: 99%

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Determination of the Pole Position of the Lightest Hybrid Meson Candidate

et al. 2019

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Mapping states with explicit gluonic degrees of freedom in the light sector is a challenge, and has led to controversies in the past. In particular, the experiments have reported two different hybrid candidates with spin-exotic signature, π1(1400) and π1 (1600), which couple separately to ηπ and η π. This picture is not compatible with recent Lattice QCD estimates for hybrid states, nor with most phenomenological models. We consider the recent partial wave analysis of the η ( ) π system by the COMPASS collaboration. We fit the extracted intensities and phases with a coupled-channel amplitude that enforces the unitarity and analyticity of the S-matrix. We provide a robust extraction of a single exotic π1 resonant pole, with mass and width 1564 ± 24 ± 86 MeV and 492 ± 54 ± 102 MeV, which couples to both η ( ) π channels. We find no evidence for a second exotic state. We also provide the resonance parameters of the a2(1320) and a 2 (1700).

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confidence: 87%

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confidence: 99%

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Determination of the Pole Position of the Lightest Hybrid Meson Candidate

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“…A recent analysis of COMPASS data on the ηπ final state using an analytic model based on the principles of the relativistic S-matrix also obtained a smaller width for the a 2 (1700) of 280±10(stat.)±70(sys.) MeV/c 2 [5] [d] . However, the authors of Ref.…”

Section: J Pc = 2 ++ Resonancesmentioning

confidence: 99%

“…However, the authors of Ref. [5] only fitted the intensity spectra. In contrast to our analysis, the relative phase information and the evolution with t were not taken into account.…”

Section: J Pc = 2 ++ Resonancesmentioning

confidence: 99%

Recent Results on Light-Meson Spectroscopy from COMPASS

Wallner

2018

Proceedings of XVII International Conference on Hadron Spectroscopy and Structure — PoS(Hadron2017)

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The main goal of the spectroscopy program at COMPASS is to explore the light-meson spectrum below about 2 GeV/c 2 in diffractive production. Our flagship channel is the decay into three charged pions: p + π − → π − π − π + + p recoil , for which COMPASS has acquired the so far world's largest dataset of roughly 50 M exclusive events using an 190 GeV/c π − beam. Based on this dataset, we performed an extensive partial-wave analysis. In order to extract the resonance parameters of the π J and a J states that appear in the π − π − π + system, we performed the so far largest resonance-model fit, using Breit-Wigner resonances and non-resonant contributions. This method in combination with the high statistical precision of our measurement allows us to study ground and excited states. We have found an evidence of the a 1 (1640) and a 2 (1700) in our data, which are the first excitations of the a 1 (1260) and a 2 (1320), respectively. The relative strength of the excited states with respect to the corresponding ground state is larger in the f 2 (1270) π decay mode compared to the ρ(770) π decay mode. We also study the spectrum of π 2 states in our data. Therefore, we simultaneously describe four J PC = 2 −+ waves in the resonancemodel fit by using three π 2 resonances, the π 2 (1670), the π 2 (1880), and the π 2 (2005). Within the limits of our model, we can conclude that the π 2 (2005) is required to describe all four 2 −+ waves properly.

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