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Showing 1 to 11 of 11 for “"Lepton number"”.
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Neutrino masses and Baryogenesis via Leptogenesis in the Exceptional Supersymmetric Standard Model
… neutrinos have masses much less than charged leptons and quarks in the Standard Model. One solution to the light neutrino mass puzzle is the seesaw model where right-handed neutrinos are introduced with large Majorana masses. The heavy Majorana right-handed (RH) neutrinos lead to lepton number …
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Collider phenomenology of heavy neutrinos
… the existence of tiny neutrino mass through the lepton number violating Majorana mass term. There is another alternative way, commonly known as the inverse seesaw mechanism, where the small neutrino mass is obtained by the tiny lepton number violating parameters. In this work we investigate the …
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Radioactive source measurements in a liquid xenon time projection chamber
… double beta decay. This is a yet-to-be observed lepton number violating process, which can only be described by new physics, not included in the current standard model that describes elementary particles and their interactions. One attractive case for such studies is the double beta decay of …
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Observation of Singly Charged Barium Ions in a Buffer Gas: Towards a Functional Barium-Tagging System for Use in the Enriched Xenon Observatory
… nature of the neutrino and demonstrate that lepton number is not strictly conserved. Furthermore, a measurement of the decay half-life will lend itself to a measurement of the absolute mass scale of the neutrino. The sensitivity to observing the neutrinoless-double-beta-decay of 136Xe is …
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Deep Learning for the KamLAND-Zen Search for 0𝜈𝛽𝛽
… that neutrinos are Majorana fermions and that lepton number is not a symmetry of nature, thus providing a possible explanation for the observed matter-antimatter asymmetry of the universe. KamLAND-Zen is a leading search for 0𝜈𝛽𝛽, having placed the most stringent limit on its half-life at …
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A search for the reaction [mu]⁻ + Cu [arrow] e⁺ + Co
… µ⁻ + Cu ⟶ e⁺ + Co, which is allowed by the lepton conservation scheme that assigns the same lepton number to the µ⁻, e⁺, v<sub>µ</sub> , and vₑ. Momentum analysis of particles emitted following muon capture was performed using a magnetic spectrometer with magnetostrictive readout wire spark …
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The search for majoron emission in xenon-136 and two-neutrino double-beta decay of xenon-134 with the Enriched Xenon Observatory
… the particle physics conservation law of total lepton number is violated in nature. The latter two consequences are particularly salient, as they lead to potential explanations of neutrino mass generation and the observed large asymmetry of matter over antimatter in the universe. The Enriched …
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Search for neutrinoless double-beta decay and 42Ar in enriched xenon using the EXO-200 dataset
… of particle (the Majorana neutrino), violate lepton number conservation, and provide a constraint on the neutrino mass scale. The Enriched Xenon Observatory experiment (EXO-200) operated an extremely radio-pure tracking calorimeter filled with liquid xenon enriched in the candidate isotope …
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Attenuation of the scintillation light in liquid argon and investigation of the double beta decay of ⁷⁶Ge into excited states of ⁷⁶Se in the GERDA experiment
… of the 0𝜈𝛽𝛽 decay would imply the violation of lepton number conservation which is a key feature in some theories explaining the asymmetry of matter and antimatter in the universe. The effective Majorana neutrino mass is connected with the half life of the 0𝜈𝛽𝛽 decay via a nuclear matrix element …
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Pulse-shape studies with coplanar grid CdZnTe detectors and searches for rare nuclear decays with the COBRA experiment
… feature is the explicit violation of the total lepton number, which is an accidentally conserved quantity in the Standard Model of particle physics, and would prove the Majorana nature of neutrinos. This, in turn, would support the theoretical explanation of the origin of the observed baryon …
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Μελέτη του μιονικού και λεπτονικού αριθμού στις σύγχρονες θεωρίες βαθμίδας
LEPTON AND FLAVOUR NUMBER VIOLATING PROCESSES ARE EXAMINED IN THE CONTEXT OF MODERN GAUGE THEORIES. MORE PRECISELY THE PROCESSES (TYPE) ARE INVESTIGATED ANDVARIOUS MECHANISMS HAVE BEEN CONSIDERED WHICH INVOLVE: A) SEVERAL EXTENSIONS OF THE STANDARD GLASHOW- WEINBERG-SALAM MODEL, WITH THE …