Search for exclusive photoproduction of Z$_c^{\pm}$(3900) at COMPASS

Adolph, C.; Akhunzyanov, R.; Alexeev, M. G.; Alexeev, G. D.; Amoroso, A.; Andrieux, V.; Anosov, V.; Austregesilo, A.; Badelek, B.; Balestra, F.; Barth, J.; Baum, G.; Beck, R.; Bedfer, Y.; Berlin, A.; Bernhard, J.; Bicker, K.; Bielert, E. R.; Bieling, J.; Birsa, R.; Bisplinghoff, J.; Bodlak, M.; Boer, M.; Bordalo, P.; Bradamante, F.; Braun, C.; Bressan, A.; Buechele, M.; Burtin, E.; Capozza, L.; Chiosso, M.; Chung, S. U.; Cicuttin, A.; Crespo, M. L.; Curiel, Q.; Torre, S. Dalla; Dasgupta, S. S.; Dasgupta, S.; Denisov, O. Yu.; Donskov, S. V.; Doshita, N.; Duic, V.; Duennweber, W.; Dziewiecki, M.; Efremov, A.; Elia, C.; Eversheim, P. D.; Eyrich, W.; Faessler, M.; Ferrero, A.; Filin, A.; Finger, M.; Finger, M.; Fischer, H.; Franco, C.; von Hohenesche, N. du Fresne; Friedrich, J. M.; Frolov, V.; Gautheron, F.; Gavrichtchouk, O. P.; Gerassimov, S.; Geyer, R.; Gnesi, I.; Gobbo, B.; Goertz, S.; Gorzellik, M.; Grabmueller, S.; Grasso, A.; Grube, B.; Grussenmeyer, T.; Guskov, A.; Haas, F.; von Harrach, D.; Hahne, D.; Hashimoto, R.; Heinsius, F. H.; Herrmann, F.; Hinterberger, F.; Hoeppner, Ch.; Horikawa, N.; d'Hose, N.; Huber, S.; Ishimoto, S.; Ivanov, A.; Ivanshin, Yu.; Iwata, T.; Jahn, R.; Jary, V.; Jasinski, P.; Joerg, P.; Joosten, R.; Kabuss, E.; Ketzer, B.; Khaustov, G. V.; Khokhlov, Yu. A.; Kisselev, Yu.; Klein, F.; Klimaszewski, K.; Koivuniemi, J. H.; Kolosov, V. N.; Kondo, K.; Koenigsmann, K.; Konorov, I.; Konstantinov, V. F.; Kotzinian, A. M.; Kouznetsov, O.; Kraemer, M.; Kroumchtein, Z. V.; Kuchinski, N.; Kunne, F.; Kurek, K.; Kurjata, R. P.; Lednev, A. A.; Lehmann, A.; Levillain, M.; Levorato, S.; Lichtenstadt, J.; Maggiora, A.; Magnon, A.; Makke, N.; Mallot, G. K.; Marchand, C.; Martin, A.; Marzec, J.; Matousek, J.; Matsuda, H.; Matsuda, T.; Meshcheryakov, G.; Meyer, W.; Michigami, T.; Mikhailov, Yu. V.; Miyachi, Y.; Nagaytsev, A.; Nagel, T.; Nerling, F.; Neubert, S.; Neyret, D.; Nikolaenko, V. I.; Novy, J.; Nowak, W. -D.; Nunes, A. S.; Olshevsky, A. G.; Orlov, I.; Ostrick, M.; Panknin, R.; Panzieri, D.; Parsamyan, B.; Paul, S.; Peshekhonov, D. V.; Platchkov, S.; Pochodzalla, J.; Polyakov, V. A.; Pretz, J.; Quaresma, M.; Quintans, C.; Ramos, S.; Regali, C.; Reicherz, G.; Rocco, E.; Rossiyskaya, N. S.; Ryabchikov, D. I.; Rychter, A.; Samoylenko, V. D.; Sandacz, A.; Sarkar, S.; Savin, I. A.; Sbrizzai, G.; Schiavon, P.; Schill, C.; Schlueter, T.; Schmidt, K.; Schmieden, H.; Schoenning, K.; Schopferer, S.; Schott, M.; Shevchenko, O. Yu.; Silva, L.; Sinha, L.; Sirtl, S.; Slunecka, M.; Sosio, S.; Sozzi, F.; Srnka, A.; Steiger, L.; Stolarski, M.; Sulc, M.; Sulej, R.; Suzuki, H.; Szabelski, A.; Szameitat, T.; Sznajder, P.; Takekawa, S.; ter Wolbeek, J.; Tessaro, S.; Tessarotto, F.; Thibaud, F.; Uhl, S.; Uman, I.; Virius, M.; Wang, L.; Weisrock, T.; Wilfert, M.; Windmolders, R.; Wollny, H.; Zaremba, K.; Zavertyaev, M.; Zemlyanichkina, E.; Ziembicki, M.; Zink, A.

doi:10.48550/arxiv.1407.6186

Cited by 7 publications

(7 citation statements)

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“…This observation has been confirmed by the Belle Collaboration [11] and by Xiao et al using data from the CLEO-c detector [12]. However, it has not been observed in exclusive photoproduction of J/ψ, π on protons [13] or in conjunction with B 0 decays [14,15]. As a charged charmonium-like structure, it must contain at least four quarks, and tetraquark and molecular interpretations have been suggested.…”

Section: Introductionmentioning

confidence: 72%

Searching for the $X(3872)$ and $Z_c^+(3900)$ on HISQ lattices

Lee,

DeTar,

Mohler

et al. 2014

Preprint

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We present preliminary simulation results for the I = 0 charmonium state X( 3872)(1 ++ ) and the I = 1 charmonium state Z + c (3900)(1 +− ). The study is performed on gauge field configurations with 2+1+1 flavors of highly improved staggered sea quarks (HISQ) with clover (Fermilab interpretation) charm quarks and HISQ light valence quarks. Since the X(3872) lies very close to the open charm D D * threshold, we use a combination of cc and D D * + DD * interpolating operators. For the Z +c (3900) we use a combination of J/ψπ and D D * + DD * channels. This is the first such study with HISQ sea quarks and light valence quarks. To this end, we describe a variational method for treating staggered quarks that incorporates both oscillating and non-oscillating components.

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Section: Introductionmentioning

confidence: 72%

Searching for the $X(3872)$ and $Z_c^+(3900)$ on HISQ lattices

Lee,

DeTar,

Mohler

et al. 2014

Preprint

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“…• The resonance Z + c (3900) was found in J/ψ π invariant mass only through e + e − → Y (4260) → (J/ψ π + )π − [4][5][6]. No resonant structure in J/ψ π + invariant mass was seen in B0 → (J/ψ π + )K − by BELLE [10], in B0 → (J/ψπ + )π − by LHCb [37] or in γp → (J/ψ π + )n by COMPASS [38]. This might indicate that the peak seen in e + e − → Y (4260) → (J/ψ π + )π − might not be of dynamical origin.…”

Section: Resultsmentioning

confidence: 93%

Study of the $Z_c^+$ channel using lattice QCD

Prelovsek,

Lang,

Leskovec

et al. 2014

Preprint

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Recently experimentalists have discovered several charged charmonium-like hadrons Z + c with unconventional quark content cc du. We perform a search for Z + c with mass below 4.2 GeV in the channel I G (J P C ) = 1 + (1 +− ) using lattice QCD. The major challenge is presented by the twomeson states J/ψ π, ψ2Sπ, ψ1Dπ, D D * , D * D * , ηcρ that are inevitably present in this channel. The spectrum of eigenstates is extracted using a number of meson-meson and diquark-antidiquark interpolating fields. For our pion mass of 266 MeV we find all the expected two-meson states but no additional candidate for Z + c below 4.2 GeV. Possible reasons for not seeing an additional eigenstate related to Z + c are discussed. We also illustrate how a simulation incorporating interpolators with a structure resembling low-lying two-mesons states seems to render a Z + c candidate, which is however not robust after further two-meson states around 4.2 GeV are implemented.

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“…It is still unclear whether the Z c is a typical resonance, or if it only appears due to multi-channel phenomena. There is also another potential reason why Z c did not appear in our simulation; the Z + c (3900) was found only in e + e − → Y (4260) → (J/ψπ + )π − [4,5,6], but not in the decays B − 0 → (J/ψπ + )K − [10], B − 0 → (J/ψπ + )π− [23] or in γ p → (J/ψπ + )n [24]. This might indicate that the peek seen in e + e − → Y (4660) → (J/ψπ + )π − might not be of dynamical origin.…”

Section: Resultsmentioning

confidence: 94%

Study of the Zc+ channel in lattice QCD

Leskovec¹,

Prelovšek²,

Lang³

et al. 2015

Proceedings of the 32nd International Symposium on Lattice Field Theory — PoS(LATTICE2014)

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Several charged charmonium-like hadrons called Z c have been recently discovered by different experiments. In contrast to conventional hadrons these contain at least two valence quarks and antiquarks (ccdu). We perform a lattice QCD simulation of the I G (J PC ) = 1 + (1 +− ) channel including all relevant two-meson operators under 4.3 GeV: J/ψ π, ψ 2S π, ψ 1D π, DD * , D * D * , η c ρ as well as additional diquark anti-diquark operators. In our N f = 2 simulation with pion mass at 266 MeV we are able to identify all two-meson levels within the energy region of interest. However we find no additional level identifiable as a candidate for Z c .

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Search for exclusive photoproduction of Z$_c^{\pm}$(3900) at COMPASS

Cited by 7 publications

References 0 publications

Searching for the $X(3872)$ and $Z_c^+(3900)$ on HISQ lattices

Searching for the $X(3872)$ and $Z_c^+(3900)$ on HISQ lattices

Study of the $Z_c^+$ channel using lattice QCD

Study of the Zc+ channel in lattice QCD

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