The effect of collisions with the wall on neutron-antineutron transitions

Kerbikov, B. O.

doi:10.1016/j.physletb.2019.06.041

Cited by 9 publications

(6 citation statements)

References 24 publications

(40 reference statements)

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“…Note in passing, that the Hamiltonian of the form ( 11) is common for studying of two-level systems like e.g. neutron-antineutron oscillations [12].…”

Section: Oscillations Between Visible and Hidden Photonsmentioning

confidence: 99%

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Light hidden photon production in high energy collisions

Demidov

Gninenko

Gorbunov

2019

J. High Energ. Phys.

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The visible and dark sectors of particle physics can be connected via the kinetic mixing between the ordinary (γ) and hidden photon (γ ). If the latter is light its production in high energy collisions of ordinary particles occurs via the γ − γ oscillations similarly to the neutrino processes. Generically, the experiments are insensitive to mass of the hidden photon, if it is lighter than 1 MeV, and it does not decay into e + e − -pair. Still, one can use the missing energy and scattering off the detector as signatures to search for light hidden photon. Presence of media suppresses production of the light vectors making the experiments insensitive to the entire model. In media the light hidden photon production is typically suppressed due to the dump of the γ −γ oscillations making the experiments insensitive to the entire model.We present analytic formulas for the light hidden photon production, propagation and detection valid for searches at colliders and beam-target experiments and apply them to estimate the impact on the sensitivities of NA64, FASER, MATHUSLA, SHiP, T2K, DUNE and NA62 for the background-free case.

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“…Note in passing, that the Hamiltonian of the form ( 11) is common for studying of two-level systems like e.g. neutron-antineutron oscillations [12].…”

Section: Oscillations Between Visible and Hidden Photonsmentioning

confidence: 99%

“…detectors), and the oscillation dynamics changes accordingly. Hence, if the produced photon covers the distance d, the system wave function evolves as (12) (set L = d and γ = 0), which gives (3) for the oscillation probability…”

Section: Production Of Hidden Photonsmentioning

confidence: 99%

Light hidden photon production in high energy collisions

Demidov

Gninenko

Gorbunov

2019

J. High Energ. Phys.

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“…An almost free n → n oscillation search has recently been proposed [144,145] in which one allows slow, cold neutrons (and antineutrons) (with energies of <10 −2 eV) to reflect from effective n/n optical mirrors. Although the reflection of n/n had been considered in the 1980s for ultra cold neutrons (UCNs) [146][147][148][149] and recently in [145] for proposed experiments to constrain τ n→n , the authors now extended this approach to higher energies, namely where nominally cold, initially collimated neutrons can be reflected from neutron guides when their transverse velocities with respect to the wall are similarly very or ultracold. Conditions for suppressing the phase difference for n and n were studied, and the required low transverse momenta of the n/n system was quantified, leading to new suggestions for the nuclei composing the reflective guide material.…”

Section: Phase Shift Suppressionmentioning

confidence: 99%

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

Addazi

Anderson

Ansell

et al. 2021

J. Phys. G: Nucl. Part. Phys.

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The violation of baryon number, B , is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the Universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron–antineutron oscillation ( n → n ̄ ) via mixing, neutron–antineutron oscillation via regeneration from a sterile neutron state ( n → [ n ′ , n ̄ ′ ] → n ̄ ), and neutron disappearance (n → n′); the effective Δ B = 0 process of neutron regeneration ( n → [ n ′ , n ̄ ′ ] → n ) is also possible. The program can be used to discover and characterize mixing in the neutron, antineutron and sterile neutron sectors. The experiment addresses topical open questions such as the origins of baryogenesis and the nature of dark matter, and is sensitive to scales of new physics substantially in excess of those available at colliders. A goal of the program is to open a discovery window to neutron conversion probabilities (sensitivities) by up to three orders of magnitude compared with previous searches. The opportunity to make such a leap in sensitivity tests should not be squandered. The experiment pulls together a diverse international team of physicists from the particle (collider and low energy) and nuclear physics communities, while also including specialists in neutronics and magnetics.

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“…An almost free n → n oscillation search has recently been proposed [143,144] in which one allows slow, cold neutrons (and antineutrons) (with energies of < 10 −2 eV) to reflect from effective n/ n optical mirrors. Although the reflection of n/ n had been considered in the 1980's for ultra cold neutrons (UCNs) [145,146,147,148] and recently in [144] for proposed experiments to constrain τ n→ n, the authors now extended this approach to higher energies, namely where nominally cold, initially collimated neutrons can be reflected from neutron guides when their transverse velocities with respect to the wall are similarly very or ultra-cold. Conditions for suppressing the phase difference for n and n were studied, and the required low transverse momenta of the n/ n system was quantified, leading to new suggestions for the nuclei composing the reflective guide material.…”

Section: Phase Shift Suppressionmentioning

confidence: 99%

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the European Spallation Source

Addazi,

Anderson,

Ansell

et al. 2020

Preprint

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The violation of Baryon Number, B, is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR program is a proposed two-stage experiment at the European Spallation Source (ESS) to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron-antineutron oscillation (n → n) via mixing, neutron-antineutron oscillation via regeneration from a sterile neutron state (n → [n , n ] → n), and neutron disappearance (n → n ); the effective ∆B = 0 process of neutron regeneration (n → [n , n ] → n) is also possible. The program can be used to discover and characterise mixing in the neutron, antineutron, and sterile neutron sectors. The experiment addresses topical open questions such as the

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The effect of collisions with the wall on neutron-antineutron transitions

Abstract: We examine what role do collisions with the wall play in neutron-antineutron transitions. The collision time for n andn and the phase difference between reflected n andn waves are calculated. It is shown that transitions inside the wall are negligible.

Cited by 9 publications

References 24 publications

Light hidden photon production in high energy collisions

Light hidden photon production in high energy collisions

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the HIBEAM/NNBAR experiment at the European Spallation Source

New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the European Spallation Source

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