Orthopositronium Lifetime Problem

Dobroliubov, M.I.; Gninenko, S.; Ignatiev, A. Yu.; Матвеев, В.А.

doi:10.1142/s0217751x93001156

Cited by 21 publications

(25 citation statements)

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“…In Sect. 5, we present a detailed overview of K-meson, pion, B-meson, and quarkonium decays [3,96,[108][109][110][111][112][113][114][115]. A more complete treatment of the bounds resulting from meson decays, including complete (higher order) calculations of the decay rates is deferred to a separate paper [116].…”

Section: Outline and Connection To Previous Workmentioning

confidence: 99%

“…Later, in [108,109], the decays π 0 → γ γ and π 0 → γ γ γ were investigated. If we rescale the result in [108,109] from a squark mass of mq = 70 GeV to a squark mass of mq = 300 GeV [212], we obtain an upper bound on the photino branching ratios, which is well below the current experimental limits for the neutrino decays [40]:…”

Section: Pseudoscalar Mesonsmentioning

confidence: 99%

“…For their theoretical estimates the authors in [108,109] assumed a large left-right mixing in the squark sector, not taking into account flavour changing neutral current constraints. Due to the very small supersymmetric branching ratio, no bound is obtained on the bino mass.…”

Section: Pseudoscalar Mesonsmentioning

confidence: 99%

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Mass bounds on a very light neutralino

Dreiner¹,

et al. 2009

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Within the Minimal Supersymmetric Standard Model (MSSM) we systematically investigate the bounds on the mass of the lightest neutralino. We allow for nonuniversal gaugino masses and thus even consider massless neutralinos, while assuming in general that R-parity is conserved. Our main focus is on laboratory constraints. We consider collider data, precision observables, and also rare meson decays to very light neutralinos. We then discuss the astrophysical and cosmological implications. We find that a massless neutralino is allowed by all existing experimental data and astrophysical and cosmological observations.

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Section: Outline and Connection To Previous Workmentioning

confidence: 99%

Section: Pseudoscalar Mesonsmentioning

confidence: 99%

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Mass bounds on a very light neutralino

Dreiner¹,

et al. 2009

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“…We mention those of DeBenedetti and Corben (1954) [10], Maglic (1975) [11], [12], Berko and Pendleton (1980) [13], Rich (1981) [14], Mills and Chu (1990) [15], [16], Dvoeglazov et al (1993) [17], and Dobroliubov et al (1993) [18]. A.…”

Section: Introductionmentioning

confidence: 99%

Two-Loop Correction to the Orthopositronium Decay Rate

2002

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We give a detailed description of our calculation of the O(α 2 ) correction to the orthopositronium decay rate. The resulting correction is 45.06(26) in units of (α/π) 2 times the lowest order rate. When combined with other known corrections, the theoretical prediction for the decay rate is 7.039979(11) µs −1 , where the leading uncalculated term makes an estimated contribution of roughly 0.00002 µs −1 . Our result is in significant disagreement with two of the four highest precision measurements (at about the 5σ level), but does not contradict the others. The experimental uncertainties (≈0.002 µs −1 ) are much larger than the remaining theoretical uncertainties. We also calculate the one-photon-annihilation contribution to the positronium hyperfine structure at O(mα 6 ). This calculation is closely analogous to the decay rate calculation. Our agreement with prior results for this hyperfine structure contribution demonstrates the soundness of our approach. C 2002 Elsevier Science (USA)

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“…Although the unknown physics is usually addressed in a direct manner in high energy experiments, new results may also be expected from precision experiments at lower energies. Orthopositronium (o − P s, the triplet e + e − -bound state), is a particularly interesting system for such an approach [1][2][3]. For example, it has been shown recently that experiments searching for invisible decays of o − P s with the (currently achievable) level of sensitivity in the branching ratio Br(o − P s → invisible) ≃ 10 −8 − 10 −9 have significant discovery potential [2].…”

Section: Introductionmentioning

confidence: 99%

An Apparatus to Search for Mirror Dark Matter

Gninenko

2004

Int. J. Mod. Phys. A

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Mirror matter is a possible dark matter candidate. It is predicted to exist if parity is an unbroken symmetry of the vacuum. The existence of the mirror matter, which in addition to gravity is coupled to our world through photon-mirror photon mixing, would result in orthopositronium (o − P s) to mirror orthopositronium (o − P s ′ ) oscillations. The experimental signature of this effect is the invisible decay of o − P s in vacuum. This paper describes the design of the new experiment for a search for the o−P s → invisible decay in vacuum with a sensitivity in the branching ratio of Br(o − P s → invisible) ≃ 10 −7 , which is an order of magnitude better than the present limit on this decay mode from the Big Bang Nucleosynthesis. The experiment is based on a high-efficiency pulsed slow positron beam, which is also applicable for other experiments with o − P s, and (with some modifications) for applied studies. Details of the experimental design and of a new pulsing method, as well as preliminary results on requirements for the pulsed beam components are presented. The effects of o − P s collisions with the cavity walls as well as the influence of external fields on the o − P s → o − P s ′ oscillation probability are also discussed.

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Orthopositronium Lifetime Problem

Cited by 21 publications

References 0 publications

Mass bounds on a very light neutralino

Mass bounds on a very light neutralino

Two-Loop Correction to the Orthopositronium Decay Rate

An Apparatus to Search for Mirror Dark Matter

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