Evidence for a Narrow<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mo>+</mml:mo><mml:mn>1</mml:mn></mml:math>Baryon Resonance in Photoproduction from the Neutron

Nakano, Takashi; Ahn, D. S.; Ahn, J. K.; Akimune, H.; Asano, Yoshihiro; Chang, W. C.; Daté, S.; Ejiri, H.; Fujimura, H.; Fujiwara, M̄.; Hicks, K.; Hotta, T.; Imai, K.; Ishikawa, T.; Iwata, T.; Kawai, H.; Kim, Z. Y.; Kino, K.; Kohri, H.; Kumagai, N.; Makino, S.; Matsumura, T.; Matsuoka, N.; Mibe, T.; Miwa, K.; Miyabe, M.; Miyachi, Y.; Morita, Masato; Muramatsu, N.; Niiyama, M.; Nomachi, M.; Ōhashi, Y.; Ooba, T.; Ohkuma, H.; Oshuev, D. S.; Rangacharyulu, C.; Sakaguchi, A.; Sasaki, T.; Shagin, P.; Shiino, Y.; Shimizu, H.; Sugaya, Y.; Sumihama, M.; Toyokawa, H.; Wakai, A.; Wang, C. W.; Wang, S. C.; Yonehara, K.; Yorita, T.; Yoshimura, Masaki; Yosoi, M.; Zegers, R. G. T.

doi:10.1103/physrevlett.91.012002

Cited by 804 publications

(171 citation statements)

References 8 publications

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“…Narrow peaks near 1540 MeV in the nK + and pK 0 mass spectra were initially detected in low-energy photoproduction by LEPS [4] and in the charge-exchange reaction K + n → pK 0 by DIANA [5]. Subsequently, both experiments were able to confirm their initial observations [6][7][8].…”

Section: Introductionmentioning

confidence: 82%

Observation of a narrow baryon resonance with positive strangeness formed inK+Xe collisions

et al. 2014

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The charge-exchange reaction K + Xe → K 0 pXe is investigated using the data of the DIANA experiment. The distribution of the pK 0 effective mass shows a prominent enhancement near 1538 MeV formed by nearly 80 events above the background, whose width is consistent with being entirely due to the experimental resolution. Under the selections based on a simulation of K + Xe collisions, the statistical significance of the signal reaches 5.5σ . We interpret this observation as strong evidence for formation of a pentaquark baryon with positive strangeness, + (uudds), in the charge-exchange reaction K + n → K 0 p on a bound neutron. The mass of the + baryon is measured as m( + ) = 1538 ± 2 MeV. Using the ratio between the numbers of resonant and nonresonant charge-exchange events in the peak region, the intrinsic width of this baryon resonance is determined as ( + ) = 0.34 ± 0.10 MeV.

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Section: Introductionmentioning

confidence: 82%

Observation of a narrow baryon resonance with positive strangeness formed inK+Xe collisions

et al. 2014

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“…In 2003, the LEPS Collaboration announced the observation of the Θ pentaquark which is composed of uudds [29]. However, this state was not confirmed by the subsequent more advanced experiments [30].…”

Section: Exotic States and Multiquark Statesmentioning

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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“…If not two baryons making a dibaryon, how about a baryon+a meson, or a color-neutral pentaquark? It surfaced a few years ago by the claim by Nakano et al of a narrow peak, called Θ + , with a mass of M (Θ + ) = 1540 ± 10 MeV, Γ (Θ + ) < 25 MeV, in the invariant mass of K + n in the reaction γn → K − (K + n) [9]. If true, it would have strangeness +1 and at least five quarks/antiquarks.…”

Section: Pentaquarkmentioning

confidence: 99%