Precision resonance energy scans with the PANDA experiment at FAIR

Barucca, G.; Davı́, Fabrizio; Lancioni, Giovanni; Mengucci, P.; Montalto, Luigi; Natali, P. P.; Paone, Nicola; Rinaldi, D.; Scalise, Lorenzo; Erni, W.; Krusche, B.; Steinacher, M.; Walford, N. K.; Cao, N.; Liu, Z.; Liu, C.; Liu, B.; Shen, X. Y.; Sun, S. S.; Jin, Tao; Zhao, Gang; Zhao, J. Z.; Albrecht, M.; Bökelmann, S.; Erlen, T.; Feldbauer, F.; Fink, Martin; Frech, J.; Freudenreich, V.; Fritsch, M.; Hagdorn, R.; Heinsius, F. H.; Held, T.; Holtmann, T.; Keshk, I. K.; Koch, H.; Kopf, B.; Kuhlmann, M.; Kümmel, M.; Küßner, M.; Leiber, S.; Musiol, P.; Mustafa, A.; Pelizäus, M.; Pitka, A.; Reher, J.; Reicherz, G.; Richter, Markus; Schnier, C.; Sersin, S.; Sohl, L.; Sowa, C.; Steinke, M.; Triffterer, T.; Weber, T.; Wiedner, U.; Beck, R.; Hammann, Ch.; Hartmann, J.; Ketzer, B.; Müllers, J.; Roßbach, M.; Salisbury, Ben; Schmidt, Ch.; Thoma, U.; Urban, M.; Bianconi, A.; Bragadireanu, M.; Pantea, D.; Czyżycki, Wojciech; Domagała, Mariusz; Filo, Grzegorz; Jaworowski, J.; Krawczyk, Maria; Lisowski, E.; Lisowski, Filip; Michałek, M.; Płażek, J.; Korcyl, K.; Kozela, A.; Kulessa, P.; Lebiedowicz, Piotr; Pysz, K.; Schäfer, Wolfgang; Szczurek, Antoni; Fiutowski, T.; Idzik, M.; Świentek, K.; Terlecki, Pzremyslaw; Korcyl, G.; Lalik, R.; Malige, A.; Moskal, P.; Nowakowski, K.; Przygoda, W.; Rathod, N.; Rudy, Z.; Salabura, P.; Smyrski, J.; Augustin, I.; Böhm, R.; Lehmann, I.; Marinescu, D. Nicmorus; Schmitt, L.; Varentsov, V.; Al-Turany, M.; Belias, A.; Deppe, H.; Dzhygadlo, R.; Flemming, H.; Gerhardt, A.; Götzen, K.; Heinz, A.; Karabowicz, R.; Kurilla, U.; Lehmann, D.; Lühning, J.; Lynen, U.; Nakhoul, S.; Orth, H.; Peters, K.; Saito, T.; Schepers, G.; Schmidt, C. J.; Schwarz, C.; Schwiening, J.; Täschner, A.; Traxler, M.; Voss, B.; Wieczorek, P.; Abazov, V. M.; Alexeev, G. D.; Arefiev, V.; Astakhov, V.; Barabanov, M. Yu.; Batyunya, B.; Dodokhov, V.Kh.; Fechtchenko, A.; Galoyan, A.; Golovanov, G.; Koshurnikov, E. K.; Lobanov, Yu. Yu.; Olshevskiy, A.; Piskun, A. A.; Samartsev, A.; Shimanski, S.; Skachkov, N. B.; Skachkova, A. N.; Strokovsky, E. A.; Tokmenin, V. V.; Uzhinsky, V.; Verkheev, A. Y.; Vodopianov, A.; Zhuravlev, N.; Branford, D.; Glazier, D. I.; Watts, D. P.; Böhm, Michael; Eyrich, W.; Lehmann, A.; Miehling, D.; Pfaffinger, M.; Stelter, S.; Quin, N.; Robison, Lee; Seth, K. 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A.; Kunne, R.; Ramstein, B.; Boca, G.; Duda, D.; Finger, M.; Kveton, A.; Pešek, M.; Pešková, M.; Procházka, I.; Slunečka, M.; Gallus, P.; Jarý, V.; Nový, J.; Tomášek, M.; Tomášek, L.; Virius, M.; Vrba, V.; Abramov, V.; Bukreeva, S.; Chernichenko, S.; Derevschikov, A. A.; Ferapontov, V.; Goncharenko, Y.; Levin, Andrew; Maslova, E.; Mel'nik, Yu.M.; Meschanin, A.; Minaev, N. G.; Мочалов, В. В.; Moiseev, V. V.; Морозов, Д. А.; Nogach, L. V.; Poslavskiy, S.; Ryazantsev, A.; Ryzhikov, S.; Semenov, P. A.; Shein, I.; Uzunian, A.; Vasiliev, A. N.; Yakutin, A. E.; Roy, Utpal; Yabsley, B.; Belostotski, S.; Gavrilov, G.; Izotov, A.; Manaenkov, S.; Miklukho, O. V.; Veretennikov, D.; Zhdanov, A. A.; Makónyi, K.; Preston, M.; Tegnér, P. E.; Wölbing, D.; Ataç, A.; Bäck, T.; Cederwall, B.; Gandhi, Keval; Kumar, Ajay; Godre, S.; Calvo, D.; Remigis, P. De; Filippi, A.; Mazza, G.; Rivetti, A.; Wheadon, R.; Iazzi, F.; Lavagno, Andrea; Bussa, M.P.; Spataro, S.; Martin, A.; Akram, A.; Calén, H.; Andersson, W. Ikegami; Johansson, T.; Kupść, A.; Marciniewski, P.; Papenbrock, M.; Regina, Jenny; Schönning, K.; Wolke, M.; Díaz, J.; Chackara, V. Pothodi; Chłopik, A.; Kȩsik, G.; Melnychuk, D.; Trzciński, A.; Wojciechowski, M.; Wronka, S.; Zwiȩgliński, B.; Amsler, C.; Bühler, P.; Kratochwil, N.; Márton, J.; Nalti, W.; Steinschaden, D.; Suzuki, Kôji; Widmann, E.; Zimmermann, S.; Zmeskal, J.

doi:10.1140/epja/i2019-12718-2

Cited by 33 publications

(15 citation statements)

References 54 publications

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“…energy tuned to measure the line shape between 4010 and 4020 MeV, a high precision measurement of the X(3872) binding energy is foreseen at PANDA which has a brilliant energy resolution. Together with the possible high-precision measurements of (the upper limit of) the X(3872) width at PANDA [365] and Belle-II [366], a deeper understanding of the puzzling X(3872) is foreseen.…”

Section: Xy Z Statesmentioning

confidence: 99%

Threshold cusps and triangle singularities in hadronic reactions

Guo

Liu

Sakai

2020

Progress in Particle and Nuclear Physics

268

183

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The spectrum of hadrons is the manifestation of color confinement of quantum chromodynamics. Hadronic resonances correspond to poles of the S-matrix. Since 2003, lots of new hadron resonant structures were discovered in the mass regions from light mesons to hadrons containing a pair of a heavy quark and an antiquark. Many of them are candidates of exotic hadrons, and they are usually observed as peaks in invariant mass distributions. However, the S-matrix also has kinematical singularities due to the on-shellness of intermediate particles for a process, such as two-body thresholds and triangle singularities (TSs), and they can produce peaks as well. On the one hand, such singularities may be misidentified as resonances; on the other hand, they can be used as tools for precision measurements. In this paper, we review the threshold cusps and various triangle singularities in hadronic reactions, paying attention to their manifestations in phenomena related to exotic hadron candidates. * fkguo@itp.ac.cn † xiaohai.liu@tju.edu.cn ‡ shsakai@itp.ac.cn 1 The X(3872) is named χ c1 (3872) according to its quantum numbers I G (J P C ) = 0 + (1 ++ ) by the PDG [10]. Similarly, the vector charmonium-like states Y (4260) and Y (4660) mentioned below are called ψ(4260) and ψ(4660), respectively. This naming scheme does not mean that the PDG assumes them to be normal cc charmonium states. Here we follow the XY Z naming scheme that is still used in most of the relevant publications.2 A conventional explanation of the observed peaks was given in Refs. [26,27].3 region Z c (4430) [30], Z c (3900) [31,32] and Z c (4020) [33], the charged bottomonium-like structures Z b (10610) and Z b (10650) [34], and the pentaquark candidates with hidden charm P c (4312), P c (4440) and P c (4457) [35,36]. Most of these new structures were observed in the heavy-flavor sector. In particular, the heavy quarkonium-like ones are often called XY Z states in the literature due to the undetermined internal structure. On the one hand, these discoveries enlarged the known QCD spectrum to a large extent; on the other hand, they became a nice showcase of the intricate nonperturbative nature of QCD at low energies 3 : most of them fall off the expectations from quark model, which despite being just a model had provided useful guidance in classifying a large amount of hadrons into various multiplets. Therefore, they are regarded as prominent candidates of exotic hadrons. However, how the spectrum of exotic hadrons should be organized and even what types of exotic hadrons can be well defined are still unclear. Partly because of this, the observation of each of these new structures leads to different models such as compact tetraquarks (or pentaquarks), hadronic molecules, hybrid states, hadro-charmonia, and kinematic effects, etc. Nevertheless, a deeper understanding of how the hadron spectrum, in particular that of the excited hadrons above (or at least close to) strong decay thresholds, is organized can shed light on the color confinement problem of QCD. For th...

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Section: Xy Z Statesmentioning

confidence: 99%

Threshold cusps and triangle singularities in hadronic reactions

Guo

Liu

Sakai

2020

Progress in Particle and Nuclear Physics

268

183

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“…[24] it was found that light scalar tetraquarks mainly depend on the three variables encoded in S 0 and D. Retaining S 0 only, their masses are in the ballpark of what one would naively expect for a state made of four quarks (∼ 1500 MeV for four light quarks). However, the four-quark BSE dynamically and self-consistently generates intermediate meson-meson and dq-dq poles in the dressing functions f i corresponding to the (12)(34), (13) (24) and (14)(23) topologies. These poles appear in the Mandelstam plane formed by the doublet variables D and produce decay thresholds.…”

Section: B Four-quark Amplitudementioning

confidence: 99%

X(3872) as a four-quark state in a Dyson-Schwinger/Bethe-Salpeter approach

2019

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We generalise the framework of Dyson-Schwinger and Bethe-Salpeter equations for four-quark states to accommodate the case of unequal quark masses. As a first application, we consider the quantum numbers I(J P C ) = 0(1 ++ ) of the X(3872) and study the four-quark states with quark contents cqqc and cssc. Their Bethe-Salpeter amplitudes are represented by a basis of heavy-light meson-meson, hadro-charmonium and diquark-antidiquark operators, which allows for a dynamical distinction between different internal configurations. In both cases we find the heavy-light mesonmeson component to be dominant. For the putative X(3872) we obtain a mass of 3916(74) MeV; the corresponding cssc state is predicted at 4068(61) MeV.

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“…the so-called X,Y,Z states, like the X(3872) state [3] or the P c pentaquark candidates [4]. More exciting experimental data are expected from the B-factories Belle II [5] and BESIII [6], the LHCb experiment [7], the PANDA experiment at FAIR [8] and at a future Super-c-τ Factory [9].…”

Section: Introductionmentioning

confidence: 99%

How much do charm sea quarks affect the charmonium spectrum?

2019

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The properties of charmonium states are or will be intensively studied by the B-factories Belle II and BESIII, the LHCb and PANDA experiments and at a future Super-c-τ Factory. Precise lattice calculations provide valuable input and several results have been obtained by simulating up, down and strange quarks in the sea. We investigate the impact of a charm quark in the sea on the charmonium spectrum, the renormalization group invariant charm-quark mass M c and the scalar charm-quark content of charmonium. The latter is obtained by the direct computation of the mass-derivatives of the charmonium masses. We do this investigation in a model, QCD with two degenerate charm quarks. The absence of light quarks allows us to reach very small lattice spacings down to 0.023 fm. By comparing to pure gauge theory we find that charm quarks in the sea affect the hyperfine splitting at a level below 2%. The most significant effects are 5% in M c and 3% in the value of the charm quark content of the η c meson. Given that we simulate two charm quarks these estimates are upper bounds for the contribution of a single charm quark. We show that lattice spacings < 0.06 fm are needed for safe continuum extrapolations of the charmonium spectrum with O(a) improved Wilson quarks. A useful relation for the projection to the desired parity of operators in two-point functions computed with twisted mass fermions is proven.

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Precision resonance energy scans with the PANDA experiment at FAIR

Cited by 33 publications

References 54 publications

Threshold cusps and triangle singularities in hadronic reactions

Threshold cusps and triangle singularities in hadronic reactions

X(3872) as a four-quark state in a Dyson-Schwinger/Bethe-Salpeter approach

How much do charm sea quarks affect the charmonium spectrum?

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