Progress and simulations for intranuclear neutron-antineutron transformations in 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Ar</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow><mml:mn>18</mml:mn></mml:mrow><mml:mrow><mml:mn>40</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>

Barrow, J. L.; Golubeva, E.S.; Paryev, É. Ya.; Richard, Jean‐Marc

doi:10.1103/physrevd.101.036008

“…Additionally, for the multi-body decay channels discussed in this article the efficiency in WC experiments could be decreased, as it becomes difficult to reconstruct multiple overlap-ping Cherenkov rings, making alternative technologies as those in JUNO and DUNE crucial. For example, in ∆B = 2 n-n oscillations the resulting n is subsequently captured on n or p and produces a slew of decaying pions [64,65]. In DUNE, the multi-track nature of such decays could be utilized with high efficiency [66].…”

Section: Exclusive Nucleon Decay Searchesmentioning

confidence: 99%

Inclusive nucleon decay searches as a frontier of baryon number violation

Heeck

¹

,

Takhistov

²

2020

View full text Add to dashboard Cite

Proton decay, and the decay of nucleons in general, constitutes one of the most sensitive probes of high-scale physics beyond the Standard Model. Most of the existing nucleon decay searches have focused primarily on two-body decay channels, motivated by Grand Unified Theories and supersymmetry. However, many higher-dimensional operators violating baryon number by one unit, ∆B = 1, induce multi-body nucleon decay channels, which have been only weakly constrained thus far. While direct searches for all such possible channels are desirable, they are highly impractical. In light of this, we argue that inclusive nucleon decay searches, N → X+anything (where X is a light Standard Model particle with an unknown energy distribution), are particularly valuable, as are model-independent and invisible nucleon decay searches such as n → invisible. We comment on complementarity and opportunities for such searches in the current as well as upcoming largescale experiments Super-Kamiokande, Hyper-Kamiokande, JUNO, and DUNE. Similar arguments apply to ∆B > 1 processes, which kinematically allow for even more involved final states and are essentially unexplored experimentally.

show abstract

“…The spatial distribution of the w n J and the integrands in (25), the relative contribution to Γ clearly indicate the peripheral character of the process. See, e.g., [136] for an application to a simulation in the forthcoming DUNE experiment, and refs. there to earlier estimates.…”

Section: Neutron-antineutron Oscillationsmentioning

confidence: 99%

Antiproton Physics

Richard

¹

2020

Self Cite

View full text Add to dashboard Cite

We review the physics of low-energy antiprotons, and its link with the nuclear forces. This includes: antinucleon scattering on nucleons and nuclei, antiprotonic atoms and antinucleon-nucleon annihilation into mesons. Modern perspectives 39 Outlook 39 1 A brief historyIn 1932, the positron, the antiparticle of the electron, was discovered in cosmic rays and confirmed in the β + decay of some radioactive nuclei. See, e.g., the Nobel lecture by Anderson [1]. It was then reasonably anticipated that the proton also has an antiparticle, where A denotes the target nucleus. For A = p, this is a standard exercise in relativistic kinematics to demonstrate that the kinetic energy of the incoming proton should be higher than 6 m, where m is the proton mass, and c = 1. This threshold decreases if the target is more massive. The Bevatron was completed in 1954, and the antiproton was discovered in 1955 by a team lead by Chamberlain and Segrè, who were awarded the Nobel prize in 1959. 2 Shortly after the antiproton, the antineutron,n, was also discovered at Berkeley, and up to now, for any new elementary particle, the corresponding antiparticle has also been found. The discovery of the first anti-atom was well advertised [2], but this was not the case for the earlier observation of the first antinucleus, antideuterium, because of a controversy between an European team [3] and its US competitors [4]. In experiments at very high energy, in particular collisions of heavy ions at STAR (Brookhaven) and ALICE (CERN), one routinely produces light antinuclei and even anti-hypernuclei (in which an antinucleon is replaced by an antihyperonΛ) [5][6][7].The matter-antimatter symmetry is almost perfect, except for a slight violation in the sector of weak interactions, which is nearly exactly compensated by a simultaneous violation of the left-right symmetry, i.e., the product P C of parity P and charge-conjugation C is only very marginally violated. Up to now, there is no indication of any violation of the product CP T , where T is the time-reversal operator: this implies that the proton and antiproton have the same mass, a property now checked to less than 10 −9 [8].Many experiments have been carried out with low energy antiprotons, in particular at Brookhaven and CERN in the 60s and 70s, with interesting results, in particular for the physics of the mesons produced by annihilation. However, in these early experiments, the antiprotons were part of secondary beams containing many negativelycharged pions and kaons, and with a wide momentum spread.In the 70s, Simon van der Meer, and his colleagues at CERN and elsewhere imagined and developed the method of stochastic cooling [9], which produces antiproton beams of high purity, sharp momentum resolution, and much higher intensity than in the previous devices. CERN transformed the fixed-target accelerator SpS into a protonantiproton collider, SppS, with the striking achievement of the discovery of the W ± and Z 0 , the intermediate bosons of the electro-weak interaction. A similar scheme was lat...

show abstract

“…As the dominating contribution to n-n transition amplitude does not depend on the wavefunction separations between different fermions in the higher dimensions in this model (see Eq. (33), and ref [46]), future experiments searching for n-n oscillations at DUNE [47][48][49], Hyper-Kamiokande [50], and European Spallation Source [51] will be important in testing this model or constraining it further. vide a link to the Creative Commons licence, and indicate if changes were made.…”

Section: Discussionmentioning

confidence: 99%

“…This motivates further experimental searches for n-n oscillations and resultant matter instability. Indeed, these searches will be carried out at DUNE (Deep Underground Neutrino Experiment) [47][48][49] and Hyper-Kamiokande [50], and there are also prospects for an n −n search experiment at the European Spallation Source [51].…”

Section: Introductionmentioning

confidence: 99%

Nucleon and dinucleon decays to leptonic final states in a left-right symmetric model with large extra dimensions

Girmohanta

¹

2021

View full text Add to dashboard Cite

We consider baryon-number-violating nucleon and dinucleon decays to leptonic final states in the context of a left-right symmetric (LRS) model with large extra dimensions. Specifically, we study (a) nucleon to trilepton decays with $$\varDelta B=-1$$ Δ B = - 1 and $$\varDelta L=-3$$ Δ L = - 3 , and (b) dinucleon to dilepton decays with $$\varDelta B=-2$$ Δ B = - 2 and $$\varDelta L=-2$$ Δ L = - 2 . In the LRS model, $$B-L$$ B - L is gauged and is spontaneously broken by a Higgs vacuum expectation value $$v_R$$ v R , which characterizes the scale at which processes violating $$B-L$$ B - L occur. We show that together with the lower bound on $$v_R$$ v R from experimental limits on n-$${\bar{n}}$$ n ¯ oscillations, constraints from searches for other nucleon decay modes imply sufficient suppression of these nucleon to trilepton and dinucleon to dilepton decay modes in this model to agree with experimental bounds.

show abstract

Progress and simulations for intranuclear neutron-antineutron transformations in Ar1840

Cited by 34 publications

References 108 publications

Inclusive nucleon decay searches as a frontier of baryon number violation

Inclusive nucleon decay searches as a frontier of baryon number violation

Antiproton Physics

Nucleon and dinucleon decays to leptonic final states in a left-right symmetric model with large extra dimensions

Contact Info

Product

Resources

About