Pulse shape analysis in Gerda Phase II.
M AgostiniG AraujoA M BakalyarovM BalataI BarabanovL BaudisC BauerE BellottiS BelogurovA BettiniL BezrukovV BiancacciE BossioV BotheV BrudaninR BrugneraA CaldwellC CattadoriA ChernogorovT ComellatoV D'AndreaE V DemidovaN Di MarcoE DoroshkevichF FischerM FominaA GangapshevA GarfagniniC GoochP GrabmayrV GurentsovK GusevJ HakenmüllerS HemmerR HillerW HofmannJ HuangM HultL V InzhechikJ Janicskó CsáthyJ JochumM JunkerV KazalovY KermaïdicH KhushbakhtT KihmK KilgusA KirschI V KirpichnikovA KlimenkoK T KnöpfleO KochetovV N KornoukhovP KrauseV V KuzminovM LaubensteinA LazzaroM LindnerI LippiA LubashevskiyB LubsandorzhievG LutterC MacolinoB MajorovitsW ManeschgL ManzanillasM MiloradovicR MingazhevaM MisiaszekY MüllerI NemchenokK PanasL PandolaK PelczarL PertoldiP PiseriA PulliaC RansomL RauscherM RedchukS RiboldiN RumyantsevaC SadaF SalamidaS SchönertJ SchreinerM SchüttA-K SchützO SchulzM SchwarzB SchwingenheuerO SelivanenkoE ShevchikM ShirchenkoL ShtembariH SimgenA SmolnikovD StukovA A VasenkoA VeresnikovaC VignoliK von SturmV WagnerT WesterC WiesingerM WojcikE YanovichB ZatschlerI ZhitnikovS V ZhukovD ZinatulinaA ZschockeA J ZsigmondK ZuberG Zuzelnull nullPublished in: The European physical journal. C, Particles and fields (2022)
The GERmanium Detector Array (Gerda) collaboration searched for neutrinoless double- β decay in 76 Ge using isotopically enriched high purity germanium detectors at the Laboratori Nazionali del Gran Sasso of INFN. After Phase I (2011-2013), the experiment benefited from several upgrades, including an additional active veto based on LAr instrumentation and a significant increase of mass by point-contact germanium detectors that improved the half-life sensitivity of Phase II (2015-2019) by an order of magnitude. At the core of the background mitigation strategy, the analysis of the time profile of individual pulses provides a powerful topological discrimination of signal-like and background-like events. Data from regular 228 Th calibrations and physics data were both considered in the evaluation of the pulse shape discrimination performance. In this work, we describe the various methods applied to the data collected in Gerda Phase II corresponding to an exposure of 103.7 kg year. These methods suppress the background by a factor of about 5 in the region of interest around Q β β = 2039 keV, while preserving ( 81 ± 3 ) % of the signal. In addition, an exhaustive list of parameters is provided which were used in the final data analysis.
Keyphrases
- phase ii
- data analysis
- clinical trial
- open label
- electronic health record
- placebo controlled
- phase iii
- big data
- double blind
- blood pressure
- climate change
- study protocol
- high resolution
- randomized controlled trial
- high throughput
- machine learning
- magnetic resonance
- artificial intelligence
- mass spectrometry
- dual energy