Search for the Weak Decay of an<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>H</mml:mi></mml:math>Dibaryon

Belz, J.; Cousins, RD; Diwan, M.; Eckhause, M.; Ecklünd, K. M.; Hancock, A. D.; Highland, V. L.; Hoff, C.; Hoffmann, G. W.; Irwin, G. M.; Kane, J. R.; Kettell, S. H.; Klein, J. R.; Kuang, Y.; Lang, K.; Martin, R.; May, M.; McDonough, James E.; Molzon, W. R.; Riley, P.J.; Ritchie, J. L.; Schwartz, A. J.; Trandafir, A. I.; Ware, Brent; Welsh, R. E.; White, S. N.; Witkowski, M.; Wojcicki, S. G.; Worm, S. D.

doi:10.1103/physrevlett.76.3277

Cited by 48 publications

(32 citation statements)

References 18 publications

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“…Recent searches using kaon beams [3] or heavy ion beams [4,5,6] found no candidates or are still in progress [7]. There exist some claims for evidence for the H dibaryon produced in proton-nucleus [8] and in heavy-ion collisions [9].…”

Section: Introductionmentioning

confidence: 99%

Neutron star constraints on the H dibaryon

Glendenning¹,

Schaffner-Bielich

1998

Phys. Rev. C

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We study the influence of a possible H dibaryon condensate on the equation of state and the overall properties of neutron stars whose population otherwise contains nucleons and hyperons. In particular, we are interested in the question of whether neutron stars and their masses can be used to say anything about the existence and properties of the H dibaryon. We find that the equation of state is softened by the appearance of a dibaryon condensate and can result in a mass plateau for neutron stars. If the limiting neutron star mass is about that of the Hulse-Taylor pulsar a condensate of H dibaryons of vacuum mass ∼ 2.2 GeV and a moderately attractive potential in the medium could not be ruled out. On the other hand, if the medium potential were even moderately repulsive, the H, would not likely exist in neutron stars. If neutron stars of mass ∼ 1.6M ⊙ were known to exist, attractive medium effects for the H could be ruled out.

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Section: Introductionmentioning

confidence: 99%

Neutron star constraints on the H dibaryon

Glendenning¹,

Schaffner-Bielich

1998

Phys. Rev. C

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“…While the (ΛΛ) bound state, which has exactly the same quantum numbers as the H-di-baryon, was studied in [17]. Here, the main non-mesonic channel was found to be (ΛΛ) → Λ + n. If the life time of the (ΛΛ) correlation or H 0 particle is not too long, the specific decay channels might be used to distinguish between both states.There are several searches in heavy-ion collisions for the H-di-baryon [18,19] and for long-lived strangelets [20,21] with high sensitivities. Hypernuclei have been detected most recently in heavy-ion reactions at the AGS by the E864 collaboration [22].…”

mentioning

confidence: 99%

“…There are several searches in heavy-ion collisions for the H-di-baryon [18,19] and for long-lived strangelets [20,21] with high sensitivities. Hypernuclei have been detected most recently in heavy-ion reactions at the AGS by the E864 collaboration [22].…”

mentioning

confidence: 99%

Novel Mechanism ofH0Dibaryon Production in Proton-Proton Interactions from Parton-Based Gribov-Regge Theory

Bleicher

Aichelin

et al. 2004

Phys. Rev. Lett.

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A novel mechanism of H 0 and strangelet production in hadronic interactions within the Gribov-Regge approach is presented. In contrast to traditional distillation approaches, here the production of multiple (strange) quark bags does not require large baryon densities or a QGP. The production cross section increases with center of mass energy. Rapidity and transverse momentum distributions of the H 0 are predicted for pp collisions at E lab = 160 AGeV and √ s = 200 GeV. The predicted total H 0 multiplicities are of order of the Ω − yield and can be accessed by the NA49 and the STAR experiments.The existence or non-existence of multi-quark bags, e.g. strangelets and (strange) di-baryons is one of the great open problems of intermediate and high energy physics. Early theoretical models based on SU(3) and SU(6) symmetries [1,2] and on Regge theory [3,4] suggest that di-baryons should exist. More recently, QCDinspired models predict di-baryons with strangeness S = 0, -1, and -2. The invariant masses range between 2000 and 3000 MeV [5][6][7][8][9][10][11][12]. Unfortunately, masses and widths of the expected 6-quark states differ considerably for these models. However, most QCD-inspired models predict di-baryons and none seems to forbid them.Especially the search for a stable H-particle is closely related to the study of Ξ and ΛΛ hypernuclei (for very recent data on double Λ hypernuclei see [13,14]). From observations on double Λ hypernuclei, a mass of m H > 2m ΛΛ −28 MeV is expected, while Jaffe estimated a binding energy of ≈ −80 MeV. The H is a six quark state (uuddss) coupled to an SU(3) singlet in color and flavor. Since its mass is smaller than 2m Λ it is stable against strong decays. However, this object with baryon number two is not an ordinary nuclear state: the multi-quark cluster contained in the H is deconfined. Thus, the H is the smallest strangelet or might even be seen as a small droplet of Quark-Gluon-Plasma. While on the hadronic side, hypernuclei are known to exist already for a long time, e.g. double Λ hypernuclear events have been reported [13][14][15], no stringent observation of the H-particle exists. Even today, decades after the first prediction of the S = −2 H-di-baryon by Jaffe [5] the question of its existence is still open.A major uncertainty for the detection of such speculative states is their (meta)stability. Metastable exotic multihypernuclear objects (MEMOs), for example, consists of nucleons, Λ's, and Ξ and are stabilized due to Pauli's principle, blocking the decay of the hyperons into nucleons. Only few investigations about the weak decay of di-baryons exist so far (see [12] for a full discussion and new estimates for the weak nonleptonic decays of strange di-baryons): In [16], the H-di-baryon was found to decay dominantly by H → Σ − + p for moderate binding energies. While the (ΛΛ) bound state, which has exactly the same quantum numbers as the H-di-baryon, was studied in [17]. Here, the main non-mesonic channel was found to be (ΛΛ) → Λ + n. If the life time of the (ΛΛ) correlation ...

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“…This cannot be extrapolated to the few-MeV masses applicable to the relativistic bound state, but it does strongly suggest that a 6-quark state with mass less than 2m Λ should exist. This lattice QCD evidence pointing to a bound state, combined with the experimental failure to detect a decaying H-dibaryon [7,8,9], is in fact compelling, albeit indirect, evidence for the stable or effectively stable S as advocated here.…”

Section: A Stable Sexaquarkmentioning

confidence: 52%

“…As a result it does not bind to nuclei and limits on exotic isotopes are inapplicable [4]; constraints on decaying doubly-strange hypernuclei are inapplicable [3,5,6]; nuclei are stable [3]. Accelerator searches either looked explicitly for decay products (as expected in the H-dibaryon scenario [2]) [7,8,9] or were only sensitive to masses ≥ 2 GeV [10,11].…”

Section: A Stable Sexaquarkmentioning

confidence: 99%

6-quark Dark Matter: viable + explains many observations

Farrar¹

2017

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)

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It has recently been proposed that the relatively inert, highly symmetric, neutral flavor singlet scalar hadron made of uuddss quarks may have a mass < 2(m p + m e ). This is consistent with QCD theory, and with existing accelerator and non-accelerator constraints. For mass in the 1.5-1.8 GeV range, the observed DM relic abundance and the observed DM to ordinary matter ratio can emerge naturally. Dark matter freezes out before primordial nucleosynthesis and does not significantly impact primordial abundances, so the conventional argument that DM is non-baryonic does not apply. The interaction cross section between DM and the gas in the Galaxy is such that the dark matter in our local neighborhood is naturally co-rotating with the solar system, to a sufficient degree that DM may not have enough energy to be detected in applicable DM experiments. Interaction with the gas in galactic disks provides the first (non-MONDian) explanation for the striking correlation in the small-scale structure of rotation curves and the inhomogeneous distribution of gas, and also accounts (unlike MOND) for instances of galaxies not exhibiting such correlations. Depending on the cross-section, a DM-baryon interaction can produce a dark matter disk as suggested by recent studies, and has many or all virtues of self-interacting DM (SIDM) for removing inconsistencies of LCDM. Lab experiments to discover this particle are discussed.

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Search for the Weak Decay of anHDibaryon

Cited by 48 publications

References 18 publications

Neutron star constraints on the H dibaryon

Neutron star constraints on the H dibaryon

Novel Mechanism ofH0Dibaryon Production in Proton-Proton Interactions from Parton-Based Gribov-Regge Theory

6-quark Dark Matter: viable + explains many observations

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