An Update AT PPNS, GENERATOR PROGRESS, NEW PAPERS IN THE - PowerPoint PPT Presentation

An 𝑜 → ത 𝑜 Update 𝑜 → ഥ 𝑜 AT PPNS, GENERATOR PROGRESS, NEW PAPERS IN THE FIELD, MY UPCOMING PUBLICATIONS, AND FUTURE PLANS BY JOSHUA BARROW, JBARROW3@VOLS.UTK.EDU

Things are starting to happen in 𝑜 → ത 𝑜 … Neutrons and 𝑜 → ത 𝑜 have become a talking point in the past few months! ◦ See Jeremy Hewes’ thesis for details on ~ first order intranuclear modeling and fully 40 𝐵𝑠 developed convolutional neural network analysis techniques for 𝑜 → ത 𝑜 in 18 ◦ European Spallation Source NNbar Collaboration meeting (8 th ) at Institut Laue-Langevin, Grenoble, France ◦ Key talks included: 12 𝐷 Elena Golubeva, giving an overview of our work on 𝑜 → ത 𝑜 on 6 1. ◦ Will be submitted very soon to PRD (I hope to find some time this week) 40 𝐵𝑠 ◦ Foundational structure laid for intranuclear 𝑜 → ത 𝑜 in 18 ◦ Many new isotopic channels (from a 𝑇𝑉 3 symmetry model), not considered in Super-K, see paper ◦ Full intranuclear cascade 2. Jean-Marc Richard, giving a basic overview of nuclear theory techniques to calculate the annihilation radius 40 𝐵𝑠 probability distribution for 𝑜 → ത 𝑜 in 18 ◦ Publication is forthcoming (hopefully in a couple of months) ◦ New distribution is already fully implemented in our generator (still validating!) 2 6/20/2018 DUNE NDK-HEP BIWEEKLY MEETING

Things are starting to happen in 𝑜 → ത 𝑜 …(cont.) Neutrons and 𝑜 → ത 𝑜 have become a key talking point in the past few months! ◦ Particle Physics at Neutron Sources (decadal) at Institut Laue-Langevin, Grenoble, France 1. Key people in the field were taken aback by Vincenzo Cirigliano’s talk on the morning of the second day, in which he dedicated the last half to 𝑜 → ത 𝑜 and post-sphaleron baryogenesis ◦ Said all of the “controversial”, but necessary, things for us without any fanfare (a huge gift!) ◦ Shows ( hopefully !) a growing angst in the field for new results in baryon number violation experiments ◦ Must explain baryogenesis! 2. Albert Young spoke about prospects for a free neutron beam experiment at ESS and ILL 3. I spoke about intranuclear 𝑜 → ത 𝑜 at DUNE in my talk (see the full talk, with backup slides, here) ◦ Highlighted Jeremy’s work, DUNE’s reach capability, issues with initial assumptions in current generator, etc. People seemed very positive and interested! ◦ Multiple experimental neutron science leaders (Geoff Greene, Mike Snow, Albert Young, Robert Pattie, Alexey Fomin, etc.) are highly interested in DUNE’s 𝑜 → ത 𝑜 reach capabilities ◦ Goal is to produce a model with first and second order corrections to better understand signal to background ratios 3 6/20/2018 DUNE NDK-HEP BIWEEKLY MEETING

Current Generator Work with Elena Golubeva, INR (in progress) Main implementation of JMR’s annihilation distribution is complete ◦ This effect is essentially independent of the suppression factor formalism JMR is finalizing calculations now ◦ Will be published soon! Differs from current modeling assumptions in GENIE, where the annihilation is assumed to go as the density distribution of the nucleus ◦ Effectively ( highly ?) overestimates the sphericity of the event topology — CNN? TMVA? ◦ Chooses higher momentum nucleon annihilation pairs from a single Bodek-Ritchie momentum distribution ◦ This is actually quantum mechanically inconsistent Main focus going forward is… 40 𝐵𝑠 1. A spectral function implementation for 18 ◦ Short range correllations are already effectively included by JMR ◦ Will need to make sure that momentum distributions on our end are used consistently with his antineutron wave functions 2. Atmospheric neutrino sample to follow 3. I will then endeavor to rework GENIE simulations 4. Move on to GiBUU and NuWRO 4 DUNE NDK-HEP BIWEEKLY MEETING 6/20/2018

Recent articles to check out Anca Tureanu, Quantum Field Theory of Oscillations: Neutron-Antineutron Conversion Zhang et al, Implications of an Improved Neutron-Antineutron Oscillation Search for Baryogenesis: A Minimal Effective Theory Analysis ◦ Very useful graphs to compare Super-Kamiodande, DUNE, and ESS limits in a very general theoretical framework ◦ Assumes properly understood suppression factor to map on to the same free transformation time ◦ Contains an immense and absolutely wonderful list of references from the whole of the field ◦ Jeremy and I are actually cited! Miller et al, How short ranged-interactions influence long-ranged nuclear properties: Application to nuclear charge radii ◦ Why short range correllations matter! 5 6/20/2018 DUNE NDK-HEP BIWEEKLY MEETING

Publications in the pipeline 12 𝐷 will be submitted to PRD very soon ( end of summer ?) Our 𝑜 → ത 𝑜 on 6 1. 40 𝐵𝑠 ( fall ?) 2. Currently drafting intranuclear 𝑜 → ത 𝑜 paper for 18 ◦ Will wait for JMR to publish annihilation distribution article ◦ Will include suppression factor for 𝐵𝑠 ? ◦ Must first implement spectral function consistently ◦ We do have some events already, but much more work is needed on the modeling and V&V end ◦ Will hopefully be modeling proton decay soon in this new generator framework! 3. Currently drafting proceedings for Institute for Nuclear Theory Workshop on Neutron Oscillations: Appearance, Disappearance, and Baryogenesis ( end of year ?) ◦ Most likely to appear in Nuclear Physics B 4. Currently drafting white paper review article of the field ( end of year ?) ◦ Will review basic theory and phenomenology ◦ Current work and limits in free and bound transformations (ESS, DUNE, Hyper-Kamiokande, maybe ILL) ◦ Will await most of the above publications, and others that are being discussed now within our own research group and with several other colleagues ◦ Talk to me about co- authorship if you’ve done something interesting here; I will be sending out requests at some point soon Will co-author a joint PPNS free and bound 𝑜 → ത 𝑜 proceedings with Albert Young ( no idea ???) 5. 6 6/20/2018 DUNE NDK-HEP BIWEEKLY MEETING

My work over the next 18- 24 months… 1. Continue modeling work with the new generator for intranuclear 𝑜 → ത 𝑜 in 𝐵𝑠 with Elena Golubeva ( ~ half time) 2. Complete short range correlation data analysis for 𝑓 scattering on 𝐷 at JLAB with Nadia Fomin ( ~ half time for the next ≳ 6 months; may be teaching as well) Will hopefully serve as an experimental input to our model in some way (at least for ESS and 𝐷 ) ◦ 3. If SCGSR comes through… ◦ Move to Fermilab for (at least) 1/3-12/23/19 ◦ Work with Minerba Betancourt and Saori Pastore on implementation of a new, data-driven cross section model for neutrino scattering in GENIE ◦ Use this to generate Honda-Homestake atmospheric flux samples for the NDK group (and anyone else who wants them!) ◦ Work on GENIE remodeling with new annihilation distribution and spectral functions ◦ Begin modeling of signal and background in GiBUU and NuWRO ◦ Maybe give a few seminars at Fermilab on 𝐶 − 𝑀 violation and the importance of 𝑜 → ത 𝑜 as a possible explanation of baryogenesis 7 6/20/2018 DUNE NDK-HEP BIWEEKLY MEETING