Enhanced ΛΛ production near threshold in the 12C(K−,K+) reaction

Ahn, J. K.; Aoki, Shigeki; Chung, K.S.; Chung, M.; En’yo, H.; Fukuda, T.; Funahashi, H.; Goto, Y.; Higashi, A.; Ieiri, M.; Iijima, T.; Iinuma, Munekazu; Imai, K.; Itow, Y.; Lee, Jeon Mi; Makino, S.; Masaike, A.; Matsuda, Y.; Matsuyama, Y.; Mihara, S.; Nagoshi, C.; Nomura, I.; Park, I. S.; Saito, N.; Sekimoto, M.; Shin, Yong Moon; Sim, K. S.; Susukita, R.; Takashima, R.; Takéutchi, F.; Tlustý, P.; Weibe, S.; Yokkaichi, S.; Yoshida, Kenichi; Yoshida, Mitsuo; Yoshida, T.; Yamashita, S.

doi:10.1016/s0370-2693(98)01416-6

Cited by 53 publications

(21 citation statements)

References 19 publications

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“…The main objective of this experiment was to search for H-dibaryon resonance with (K − , K + ) reaction. We searched for the enhancement at the threshold region of the double-Λ system, which was first measured at KEK-PS E224 experiment [31], with much better statistics [32]. Besides this reaction, we optionally took π − p → K − X data, because the Θ + search via mesonic reaction became crucial to confirm its existence and the K2 beam line is a unique beam line which can provide up to 2 GeV/c π beam.…”

Section: Methodsmentioning

confidence: 99%

Search for Θ+ via π−p→K−X reaction near production threshold

Miwa¹,

Ahn²,

Aoki³

et al. 2006

Physics Letters B

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We have searched for Θ + via π − p → K − X reaction using 1.87 and 1.92 GeV/c π − beam at the K2 beam line of the KEK 12 GeV Proton Synchrotron. In the missing mass spectrum at beam momentum of 1.92 GeV/c, a bump has been found at 1530 MeV/c 2 which is consistent with the mass reported by several experiments. The statistical significance of this bump, however, is only 2.5−2.7σ. Therefore we have derived the upper limit of Θ + production cross section via π − p → K − Θ + reaction which is 3.9µb at 90% confidence level assuming that Θ + is produced isotropically in the center of mass system.

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Section: Methodsmentioning

confidence: 99%

Search for Θ+ via π−p→K−X reaction near production threshold

Miwa¹,

Ahn²,

Aoki³

et al. 2006

Physics Letters B

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“…Recent lattice QCD calculations have demonstrated that H appears as the bound * kmorita@yukawa.kyoto-u.ac.jp † ohnishi@yukawa.kyoto-u.ac.jp state around the flavor SU(3) limit, and they also suggest the possibility for H to appear as a bound state or resonance pole [7]. Experimentally, KEK-E224 and KEK-E522 experiments [8,9] demonstrated that the invariant mass spectrum is enhanced in the low energy region between and N thresholds, compared with the phase space estimate and the classical transport model calculations [10]. Enhancement of the invariant mass spectrum just above the threshold implies the final state interaction effects of attraction.…”

Section: Introductionmentioning

confidence: 99%

ΛΛinteraction from relativistic heavy-ion collisions

2015

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We investigate the two-particle intensity correlation function of in relativistic heavy-ion collisions. We find that the behavior of the correlation function at small relative momenta is fairly sensitive to the interaction potential and collective flows. By comparing the results of different source functions and potentials, we explore the effect of intrinsic collective motions on the correlation function. We find that the recent STAR data give a strong constraint on the scattering length and effective range of interaction, as −1.8 fm −1 < 1/a 0 < −0.8 fm −1 and 3.5 fm < r eff < 7 fm, respectively, if samples do not include the feed-down contribution from long-lived particles. We find that the feed-down correction for 0 decay reduces the sensitivity of the correlation function to the detail of the interaction. As a result, we obtain a weaker constraint, 1/a 0 < −0.8 fm −1 . Implication for the signal of existence of H -dibaryon is discussed. Comparison with the scattering parameters obtained from the double hypernucleus may reveal in-medium effects in the interaction.

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“…Although the models are very different in philosophy, they favor an H-dibaryon mass from 2.0 to 2.3 GeV/c 2 . There has not been as yet unambiguous observation of the stable H-dibaryon, despiting strenuous experimental efforts using a variety of approaches for searching of an H-dibaryon state [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The KEK-PS E224 experiment reported enhanced ΛΛ production near the ΛΛ threshold in the 12 C(K − , K + ) reaction with a scintillating-fiber active target [8], which was reconfirmed in the later KEK-PS E522 experiment with a relatively larger statistics [9], respectively. The enhancement is then suggestive of either the possible existence of an H-dibaryon resonance with the mass of 2242 MeV/c 2 , just 12 MeV/c 2 above the threshold, or a strongly-attractive ΛΛ final-state interaction, or both.…”

Section: Introductionmentioning

confidence: 99%

Searching for the H-Dibaryon in J-PARC with a Large Acceptance Hyperon Spectrometer

Han

Ahn

Bassalleck

et al. 2015

Proceedings of the 2nd International Symposium on Science at J-Parc — Unlocking the Mysteries of Life, Matter and the Universe

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The famed yet elusive H-dibaryon, an exotic quark state (uuddss), was predicted several decades ago and also supported by recent Lattice QCD calculations. The E42 experiment has been approved at J-PARC to search for the H-dibaryon with high statistics. A large acceptance hyperon spectrometer with a time projection chamber (TPC) will be used for searching the H-dibaryon from (K − , K + ) reaction off nuclei via its possible following decays such as ΛΛ. The E42 experiment has high sensitivity both above and below ΛΛ threshold and will be the definitive experiment on the existence of the H-dibaryon, once and for all. Recent progress and achievements of the E42 collaboration will be presented, which include simulations on estimation of TPC performance in the electric field and the magnetic field, testing and optimization of a prototype TPC, and preparation of various detectors.

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Enhanced ΛΛ production near threshold in the 12C(K−,K+) reaction

Cited by 53 publications

References 19 publications

Search for Θ+ via π−p→K−X reaction near production threshold

Search for Θ+ via π−p→K−X reaction near production threshold

ΛΛinteraction from relativistic heavy-ion collisions

Searching for the H-Dibaryon in J-PARC with a Large Acceptance Hyperon Spectrometer

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