nucl-th digest · Aug 21, 2018

[Submitted on 15 Aug 2018] (cross-list from hep-ph)

Processes that break baryon number by two units and the Majorana nature of the neutrino

We employ the simplest possible models of scalar-fermion interactions that are consistent with the gauge symmetries of the Standard Model and permit no proton decay to analyze the connections possible among processes that break baryon number by two units. In this context we show how the observation of $n$ - $n ˉ$ oscillations and of a pattern of particular nucleon-antinucleon conversion processes --- all accessible through e-d scattering --- namely, selecting from $e^{-} p \to e^{+} p ˉ$ , $e^{-} p \to n ˉ ν ˉ$ , $e^{-} n \to p ˉ ν ˉ$ , and $e^{-} n \to e^{-} n ˉ$ would reveal that the decay $π^{-} π^{-} \to e^{-} e^{-}$ must occur also. This latter process is the leading contribution to neutrinoless double beta decay in nuclei mediated by new short-distance physics, in contrast to that mediated by light Majorana neutrino exchange. The inferred existence of $π^{-} π^{-} \to e^{-} e^{-}$ would also reveal the Majorana nature of the neutrino, though the absence of this inference would not preclude it.

Comments:: 16 pages, explanatory figure and discussion, with analysis of existing phenomenological constraints, added; version to appear in Physics Letters B
Subjects:: High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:: 1808.05288 [pdf]

PLB(2019)·21 citations

An iterative method to estimate the combinatorial background

The reconstruction of broad resonances is important for understanding the dynamics of heavy ion collisions. However, large combinatorial background makes this objective very challenging. In this work an innovative iterative method which identifies signal and background contributions without input models for normalization constants is presented. This technique is successfully validated on a simulated thermal cocktail of resonances. This demonstrates that the iterative procedure is a powerful tool to reconstruct multi-differentially inclusive resonant signals in high multiplicity events as produced in heavy ion collisions.

Subjects:: Data Analysis, Statistics and Probability (physics.data-an); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Instrumentation and Detectors (physics.ins-det)
arXiv:: 1808.05466 [pdf]

EPJA(2019)·3 citations

Tuesday·August 21, 2018

Processes that break baryon number by two units and the Majorana nature of the neutrino

An iterative method to estimate the combinatorial background

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