First<i>πK</i>atom lifetime measurement and recent results from the DIRAC experiment

Zhabitsky, M.

doi:10.1051/epjconf/20148101019

Cited by 2 publications

(3 citation statements)

References 15 publications

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“…6, which is a mixture of pairs broken from different atomic states, dominantly with small n and then detected. The simulated spectrum accounts numerically the population of atomic states, the relative momentum spectra of atomic pairs at breakup points, the particle multiple scattering of in the target and the resolution of detectors [24]. Considering that contributions of above-listed processes to the total spectrum width are summed quadratically we can made few conclusions.…”

Section: Comparison and Resultsmentioning

confidence: 99%

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Dimesoatom breakup in the Coulomb field

2020

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Momentum and angular distributions of charged meson pairs h + h − (h = π, K) from elementary atoms (EA) breakup (ionization) in the Coulomb field of a target atom is considered in the Born and Glauber approximations. Exploiting the fact that the atomic screening of the target Coulomb potential is important at small transfer momenta, while multi-photon exchanges are essential at large transfer momenta we express the cross sections of EA breakup as a sum of two terms. In the region of modest transfer momenta the cross section is determined by the single-photon exchange (first Born approximation) accounting for the target atoms screening, whereas at large transfer momenta using the unscreened potential allows to take into account all multi-photon exchanges and obtain the cross section of EA breakup in the close analytical form.

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Section: Comparison and Resultsmentioning

confidence: 99%

“…Using the integral representation for the confluent hypergeometric functions (24) and the relation for the zero-order MacDonald function…”

Section: Multiple Exchangesmentioning

confidence: 99%

Dimesoatom breakup in the Coulomb field

2020

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“…The crystal has Si(220) lattice planes perpendicular to the blade surfaces (Laue-case). The effective electric field of Si( 220) is calculated to be E T = 4.1 × 10 10 V/m (the Dirac-Fock method [43,44]). The reciprocal lattice spacing and the Bragg angle are q T = 6.46 keV and θ B = 10.95 degrees, respectively, in this case.…”

Section: Experimental Setup and Measurementmentioning

confidence: 99%

Search for Axion like particles using Laue-case conversion in a single crystal

et al. 2018

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Axion Like Particles (ALPs) with a sub-keV range mass are searched by using the light-shining-through-a-wall technique. A novel system is developed in which injected X rays are converted and reconverted by the Laue-case conversion within a silicon single crystal with dual blades. The resonant ALPs mass of the conversion is scanned by varying the X-ray injection angle to the crystal. No significant signals are observed, and 90% C. L. upper limits on the ALP-two photon coupling constant are obtained as follows, g aγγ < 4.2 × 10 −3 GeV −1 (m a < 10 eV),(1) g aγγ < 5.0 × 10 −3 GeV −1 (46 eV < m a < 1020 eV).(2)These are the most stringent laboratory-based constraints on ALPs heavier than 300 eV.

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FirstπKatom lifetime measurement and recent results from the DIRAC experiment

Cited by 2 publications

References 15 publications

Dimesoatom breakup in the Coulomb field

Dimesoatom breakup in the Coulomb field

Search for Axion like particles using Laue-case conversion in a single crystal

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