Observation of a Near-Threshold Enhancement in the<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:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>+</mml:mo></mml:msubsup><mml:msubsup><mml:mi>Λ</mml:mi><mml:mi>c</mml:mi><mml:mo>−</mml:mo></mml:msubsup></mml:math>Cross Section Using Initial-State Radiation

Pakhlova, G.; Adachi, I.; Aihara, H.; Arinstein, K.; Aulchenko, V.; Aushev, T.; Bakich, A. M.; Balagura, V.; Bedny, I.; Bhardwaj, V.; Bitenc, U.; Bondar, A.; Bożek, A.; Bračko, M.; Brodzicka, J.; Browder, T. E.; Chang, P.; Chen, A.; Cheon, B. G.; Chiang, C. C.; Chistov, R.; Cho, I. S.; Choi, S. K.; Choi, Y.; Dalseno, J.; Danilov, M.; Dash, M.; Eidelman, S.; Gabyshev, N.; Ha, H.; Haba, J.; Hayasaka, K.; Hazumi, M.; Heffernan, D.; Hoshi, Y.; Hou, W.-S.; Hsiung, Y.; Hyun, H. J.; Iijima, T.; Inami, K.; Ishikawa, A.; Ishino, H.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Kah, D. H.; Kang, J. H.; Katayama, N.; Kawai, H.; Kawasaki, T.; Kichimi, H.; Kim, H. J.; Kim, S. K.; Kim, Y. I.; Kim, Y. J.; Kinoshita, K.; Križan, P.; Krokovny, P.; Kumar, R.; Kuzmin, A.; Kwon, Y. J.; Kyeong, S. H.; Lange, J. S.; Lee, J. S.; Lee, S. E.; Lesiak, T.; Li, J.; Limosani, A.; Liu, C.; Liventsev, D.; Mandl, F.; Matyja, A.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Mori, Takashi; Nakano, E.; Nakao, M.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Noguchi, S.; Ogawa, S.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Ozaki, H.; Pakhlov, P.; Pałka, H.; Park, C. W.; Park, H.; Peak, L. S.; Piilonen, L. E.; Poluektov, A.; Sahoo, H.; Sakai, Y.; Schneider, O.; Senyo, K.; Shapkin, M.; Shen, C. P.; Shiu, J. G.; Shwartz, B.; Singh, J. B.; Sokolov, A.; Stanič, S.; Starič, M.; Sumiyoshi, T.; Tanaka, M.; Taylor, G. N.; Teramoto, Y.; Tikhomirov, I.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Varner, G.; Wang, C. H.; Wang, M. Z.; Wang, P.; Wang, X. L.; Watanabe, Y.; Wedd, R.; Won, E.; Yabsley, B.; Yamashita, Y.; Yamauchi, M.; Yuan, C. Z.; Zhang, C. C.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Živko, T.; Zupanc, A.; Zyukova, O.

doi:10.1103/physrevlett.101.172001

Cited by 251 publications

(126 citation statements)

References 28 publications

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“…They applied this mechanism to study the electroproduction of Λ cΛc , and found an enhancement near 4.61 GeV. This structure was in agreement with experimental data [147], and was used to explain the Y(4630).…”

Section: Y(4630)supporting

confidence: 70%

“…In 2008, the Belle Collaboration measured the exclusive e + e − → Λ cΛc cross section, and observed an enhancement Y(4630) with a significance of 8.2σ, which was close to the Λ cΛc threshold [147], as shown in Fig. 23.…”

Section: Y(4630)mentioning

confidence: 52%

“…2.1.2.3, was observed in the exclusive e + e − → Λ cΛc cross section [147], which might be interpreted as a baryonium state [238]. The authors of Ref.…”

Section: Y(4630)mentioning

confidence: 94%

“…23. Its mass and width were determined to be M = (4634 +8 The cross section of the e + e − → Λ cΛc process [147], where an enhancement structure Y(4630) appears in the Λ cΛc invariant mass spectrum.…”

Section: Y(4630)mentioning

confidence: 99%

“…were observed in different processes, i.e., e + e − → γ ISR π + π − ψ(3686) [145] and exclusive e + e − → Λ cΛc [147], respectively. However, their masses and widths are consistent with each other within errors [147]. Hence, they can be the same state/structure as pointed out in Refs.…”

Section: Y(4630)mentioning

confidence: 99%

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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.

show abstract

Section: Y(4630)supporting

confidence: 70%

Section: Y(4630)mentioning

confidence: 52%

“…2.1.2.3, was observed in the exclusive e + e − → Λ cΛc cross section [147], which might be interpreted as a baryonium state [238]. The authors of Ref.…”

Section: Y(4630)mentioning

confidence: 94%

Section: Y(4630)mentioning

confidence: 99%

Section: Y(4630)mentioning

confidence: 99%

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The hidden-charm pentaquark and tetraquark states

et al. 2016

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Untitled

Kofler¹,

Schweiger²

2018

Light Cone 2016

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Heavy quarkonium: progress, puzzles, and opportunities

Brambilla¹,

Eidelman²,

Heltsley³

et al. 2011

Advances in the Physics of Particles and Nuclei

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103

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A golden age for heavy quarkonium physics dawned a decade ago, initiated by the confluence of exciting advances in quantum chromodynamics (QCD) and an explosion of related experimental activity. The early years of this period were chronicled in the Quarkonium Working Group (QWG) CERN Yellow Report (YR) in 2004, which presented a comprehensive review of the status of the field at that time and provided specific recommendations for further progress. However, the broad spectrum of subsequent breakthroughs, surprises, and continuing puzzles could only be partially anticipated. Since the release of the YR, the BESII program concluded only to give birth to BESIII; the B-factories and CLEO-c flourished; quarkonium production and polarization measurements at HERA and the Tevatron matured; and heavy-ion collisions at RHIC have opened a window on the deconfinement regime. All these experiments leave legacies of quality, precision, and unsolved mysteries for quarkonium physics, and therefore beg for continuing investigations at BESIII, the LHC, RHIC, FAIR, the Super Flavor and/or Tau-Charm factories, JLab, the ILC, and beyond. The list of newly-found conventional states expanded to include hc(1P ), χc2(2P ), B + c , and η b (1S). In addition, the unexpected and still-fascinating X(3872) has been joined by * Editors † Section coordinators ‡ Corresponding author: bkh2@cornell.edu more than a dozen other charmonium-and bottomonium-like "XY Z" states that appear to lie outside the quark model. Many of these still need experimental confirmation. The plethora of new states unleashed a flood of theoretical investigations into new forms of matter such as quark-gluon hybrids, mesonic molecules, and tetraquarks. Measurements of the spectroscopy, decays, production, and in-medium behavior of cc, bb, and bc bound states have been shown to validate some theoretical approaches to QCD and highlight lack of quantitative success for others. Lattice QCD has grown from a tool with computational possibilities to an industrialstrength effort now dependent more on insight and innovation than pure computational power. New effective field theories for the description of quarkonium in different regimes have been developed and brought to a high degree of sophistication, thus enabling precise and solid theoretical predictions. Many expected decays and transitions have either been measured with precision or for the first time, but the confusing patterns of decays, both above and below open-flavor thresholds, endure and have deepened. The intriguing details of quarkonium suppression in heavy-ion collisions that have emerged from RHIC have elevated the importance of separating hotand cold-nuclear-matter effects in quark-gluon plasma studies. This review systematically addresses all these matters and concludes by prioritizing directions for ongoing and future efforts.

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Observation of a Near-Threshold Enhancement in thee+e−→Λc+Λc−Cross Section Using Initial-State Radiation

Cited by 251 publications

References 28 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Untitled

Heavy quarkonium: progress, puzzles, and opportunities

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