Study of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math>using initial state radiation with<i>BABAR</i>

Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J. P.; Poireau, V.; Tisserand, V.; Zghiche, A.; Graugés, E.; Palano, A.; Pappagallo, M.; Pompili, A.; Chen, J. C.; Qi, N. D.; Rong, G.; Wang, P.; Zhu, Y. S.; Eigen, G.; Ofte, I.; Stugu, B.; Abrams, G. S.; Battaglia, M.; Best, D.; Button‐Shafer, J.; Cahn, R. N.; Charles, E.; Day, C. T.; Gill, M. S.; Gritsan, A. V.; Groysman, Y.; Jacobsen, R. G.; Kadel, R. W.; Kadyk, J.; Kerth, L. T.; Kolomensky, Yu. G.; Kukartsev, G.; Lynch, G.; Mir, L. M.; Oddone, P.J.; Orimoto, T.; Pripstein, M.; Roe, N. A.; Ronan, M. T.; Wenzel, W.A.; Barrett, M.; Ford, K. E.; Harrison, T.; Hart, A. J.; Hawkes, C. M.; Morgan, S. E.; Watson, A. T.; Fritsch, M.; Goetzen, K.; Held, T.; Koch, H.; Lewandowski, B.; Pelizaeus, M.; Peters, K.; Schroeder, T. Vazquez; Steinke, M.; Boyd, J. T.; Burke, J. P.; Cottingham, W. N.; Walker, D.; Çuhadar-Dönszelmann, T.; Fulsom, B. G.; Hearty, C.; Knecht, N. S.; Mattison, T. S.; McKenna, J. 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J.; Gradl, W.; Muheim, F.; Playfer, S.; Xie, Y.; Andreotti, M.; Bettoni, D.; Bozzi, C.; Calabrese, R.; Cibinetto, G.; Luppi, E.; Negrini, M.; Piemontese, L.; Anulli, F.; Baldini-Ferroli, R.; Calcaterra, A.; Sangro, R. de; Finocchiaro, G.; Patterí, P.; Peruzzi, I. M.; Piccolo, M.; Zallo, A.; Buzzo, A.; Capra, R.; Contri, R.; Vetere, M. Lo; Macrı́, M.; Monge, M. R.; Passaggio, S.; Patrignani, C.; Robutti, E.; Santroni, A.; Tosi, S.; Brandenburg, G.; Chaisanguanthum, K. S.; Morii, M.; Wu, J.; Dubitzky, R. S.; Marks, J.; Schenk, S.; Uwer, U.; Bhimji, W.; Bowerman, D. A.; Dauncey, P.; Egede, U.; Flack, R. L.; Gaillard, J. R.; Nash, J.; Nikolich, M. B.; Vazquez, J. G. Panduro; Chai, X.; Charles, M.; Mader, W. F.; Mallik, U.; Ziegler, V.; Cochran, J.; Crawley, H. B.; Liu, Dong; Eyges, V.; Meyer, W. T.; Prell, S.; Rosenberg, E. I.; Rubin, A. E.; Jiang, Y.; Schott, G.; Arnaud, N.; Davier, M.; Giroux, X.; Grosdidier, G.; Höcker, A.; Diberder, F. 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J.; Spitznagel, M.; Taylor, F.; Yamamoto, R. K.; Kim, H.; Patel, P. M.; Robertson, S. H.; Lazzaro, A.; Lombardo, V.; Palombo, F.; Bauer, J. M.; Cremaldi, L.; Eschenburg, V.; Godang, R.; Kroeger, R.; Reidy, J.; Sanders, D. A.; Summers, D. J.; Zhao, H. W.; Brunet, S.; Côté, D.; Taras, P.; Viaud, F. B.; Nicholson, H.; Cavallo, N.; Nardo, G. De; Fabozzi, F.; Gatto, C.; Lista, L.; Monorchio, D.; Paolucci, P.; Piccolo, D.; Sciacca, C.; Baak, M. A.; Bulten, H.; Raven, G.; Snoek, H.; Wilden, L.; Jessop, C.; LoSecco, J. M.; Allmendinger, T.; Benelli, G.; Gan, K. K.; Honscheid, K.; Hufnagel, D.; Jackson, P.; Kagan, H.; Kass, R.; Pulliam, T.; Rahimi, A. M.; Ter-Antonyan, R.; Wong, Q. K.; Blount, N. L.; Brau, J.; Frey, R.; Igonkina, O.; Lu, M.; Potter, C. T.; Rahmat, R.; Sinev, N. B.; Strom, D.; Strube, J.; Torrence, E.; Galeazzi, F.; Margoni, M.; Moran, D.; Posocco, M.; Rotondo, M.; Simonetto, F.; Stroili, R.; Voci, C.; Benayoun, M.; Chauveau, J.; David, P.; Buono, L. 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Hamel de; Kozanecki, W.; Legendre, M.; Mayer, B.; Vasseur, G.; Yèche, Ch; Zito, M.; Purohit, M.; Weidemann, A. W.; Wilson, J. R.; Abe, T.; Allen, M. T.; Aston, D.; Bartoldus, R.; Berger, N.; Boyarski, A. M.; Buchmueller, O. L.; Claus, R.; Coleman, J. P.; Convery, M. R.; Cristinziani, M.; Dingfelder, J.; Dong, D.; Dorfan, J.; Dujmić, D.; Dunwoodie, W.; Fan, Saijun; Field, R. C.; Glanzman, T.; Gowdy, S. J.; Hadig, T.; Halyo, V.; Hast, C.; Hrynʼova, T.; Innes, W. R.; Kelsey, M. H.; Kim, P.; Kocian, M. L.; Leith, D. W. G. S.; Libby, J.; Luitz, S.; Lüth, V.; Lynch, H. L.; Marsiske, H.; Messner, R.; Müller, D.; O’Grady, C. P.; Özcan, V. E.; Perazzo, A.; Perl, M.; Ratcliff, B. N.; Roodman, A.; Salnikov, A. A.; Schindler, R. H.; Schwiening, J.; Snyder, A.; Stelzer, J.; Su, D.; Sullivan, M. K.; Suzuki, K.; Swain, S. K.; Thompson, J. M.; Va’vra, J.; Bakel, N. van; Weaver, M.; Weinstein, A. J.; Wisniewski, W. J.; Wittgen, M.; Wright, D. H.; Yarritu, A. K.; Yi, K.; Young, C. C.; Burchat, P. 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doi:10.1103/physrevd.73.012005

Cited by 224 publications

(71 citation statements)

References 46 publications

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“…(3). Moreover, the fact that the decay Yð4260Þ → pp has never been observed [31] gives credit to this estimate. The inequality comes from the fact that BðXð3872Þ → J=ψπ þ π − Þ ≈ 5% [32], whereas the same branching fraction for the Yð4260Þ is expected to be equal or larger (say ≳1% as in [33]).…”

Section: The Diquark-antidiquark Description and Hadronizationmentioning

confidence: 87%

Production of tetraquarks at the LHC

et al. 2014

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The high prompt production cross section of Xð3872Þ at hadron colliders has shown to be very informative about the quark nature of the X, Y, Z states. We present here a number of results on X production in ppðpÞ collisions obtained with Monte Carlo hadronization methods and illustrate what can be learned from their use to improve our understanding of exotic states. In particular, a comparison between antideuteron and X production cross sections is proposed. Hadronization might be the key to solve the problem of the extra states expected in diquark-antidiquark models which are naturally favored after the recent confirmation of the Zð4430Þ tetraquark, together with its lower partners Z c ð3900Þ and Z 0 c ð4020Þ.

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Section: The Diquark-antidiquark Description and Hadronizationmentioning

confidence: 87%

Production of tetraquarks at the LHC

et al. 2014

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“…Three events due to Y (4260) → K + K − J / were reported corresponding to a KK/ ratio of about 1/4. A BaBaR search for Y (4260) → ppyielded a null result [622]. The BaBaR collaboration searched for Y (4260) in B decays studying the reactions B 0 → J / + − K 0 and B − → J / + − K − [637].…”

Section: A Newcc Vector State Y (4260)mentioning

confidence: 99%

Glueballs, hybrids, multiquarks

2007

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Glueballs, hybrids and multiquark states are predicted as bound states in models guided by quantum chromo dynamics (QCD), by QCD sum rules or QCD on a lattice. Estimates for the (scalar) glueball ground state are in the mass range from 1000 to 1800 MeV, followed by a tensor and a pseudoscalar glueball at higher mass. Experiments have reported evidence for an abundance of meson resonances with 0 −+ , 0 ++ and 2 ++ quantum numbers. In particular, the sector of scalar mesons is full of surprises starting from the elusive and mesons. The a 0 (980) and f 0 (980), discussed extensively in the literature, are reviewed with emphasis on their Janus-like appearance as KK molecules, tetraquark states or qq mesons. Most exciting is the possibility that the three mesons f 0 (1370), f 0 (1500), and f 0 (1710) might reflect the appearance of a scalar glueball in the world of quarkonia. However, the existence of f 0 (1370) is not beyond doubt and there is evidence that both f 0 (1500) and f 0 (1710) are flavour octet states, possibly in a tetraquark composition. We suggest a scheme in which the scalar glueball is dissolved into the wide background into which all scalar flavour-singlet mesons collapse.There is an abundance of meson resonances with the quantum numbers of the . Three states are reported below 1.5 GeV/c 2 whereas quark models expect only one, perhaps two. One of these states, (1440), was the prime glueball candidate for a long time. We show that (1440) is the first radial excitation of the meson.Hybrids may have exotic quantum numbers which are not accessible by qq mesons. There are several claims for J P C = 1 −+ exotics, some of them with properties as predicted from the flux tube model interpreting the quark-antiquark binding by a gluon string. The evidence for these states depends partly on the assumption that meson-meson interactions are dominated by s-channel resonances. Hybrids with non-exotic quantum numbers should appear as additional states. Light-quark mesons exhibit a spectrum of (squared) masses which are proportional to the sum of orbital angular momentum and radial quantum numbers. Two states do not fall under this classification. They are discussed as hybrid candidates.The concept of multiquark states has received revived interest due to new resonances in the spectrum of states with open and hidden charm. The new states are surprisingly narrow and their masses and their decay modes often do not agree with simple quark-model expectations.Lattice gauge theories have made strong claims that glueballs and hybrids should appear in the meson spectrum. However, the existence of a scalar glueball, at least with a reasonable width, is highly questionable. It is possible that hybrids will turn up in complex multibody final states even though so far, no convincing case has been made for them by experimental data. Lattice gauge theories fail to identify the nonet of scalar mesons. Thus, at the present status of approximations, lattice gauge theories seem not to provide a trustworthy guide into unknown territory ...

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“…at 90% C.L.. Its hidden charm decay modes J/ψη, J/ψK 0 s K 0 s [132,133,122], and charmless decay modes π + π − φ, [134,135,136] were not seen in experiments, neither, and the following upper limits were given:…”

Section: Its Open Charm Decay Modesmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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Study ofe+e−→pp¯using initial state radiation withBABAR

Cited by 224 publications

References 46 publications

Production of tetraquarks at the LHC

Production of tetraquarks at the LHC

Glueballs, hybrids, multiquarks

The hidden-charm pentaquark and tetraquark states

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