Fri·Aug 2, 2019Friday·August 2, 2019

1. 01*

   Probing the flavor dependence of proton's light-quark sea in the SeaQuest experiment

   Jason Dove🇺🇸

   Surprisingly large flavor asymmetry of the light-quark sea in the proton was reported in deep-inelastic scattering and Drell-Yan experiments. The Bjorken-$x$ dependence of the $\bar{d}/\bar{u}$ ratio extracted from the Fermilab E866 experiment also revealed an intriguing drop at the highest values of $x$. The Fermilab E906/SeaQuest experiment was designed to measure $\bar{d}/\bar{u}$ with improved accuracy at high Bjorken-$x$. By detecting high-mass dimuon events produced in the interaction of 120 GeV proton beam with liquid hydrogen (LH${}_2$) and deuterium (LD${}_2$) targets, the SeaQuest experiment probes the $\bar{d}/\bar{u}$ ratio up to $x\approx 0.45$. Data collection has been completed and we report the status of data analysis for SeaQuest. Two different methods for extracting the LD${}_2$/LH${}_2$ Drell-Yan cross section ratios for $0.1\le x\le 0.45$ are discussed. These ratios are compared with calculations using various PDFs.

   nucl-exPoS(2019)·1 citation
2. 02*

   New Technologies for Discovery

   Z. Ahmed · A. Apresyan · M. Artuso · P. Barry · E. Bielejec · F. Blaszczyk · T. Bose · D. Braga · S.A. Charlebois · A. Chatterjee · A. Chavarria · H.-M. Cho and 71 other authors

   For the field of high energy physics to continue to have a bright future, priority within the field must be given to investments in the development of both evolutionary and transformational detector development that is coordinated across the national laboratories and with the university community, international partners and other disciplines. While the fundamental science questions addressed by high energy physics have never been more compelling, there is acute awareness of the challenging budgetary and technical constraints when scaling current technologies. Furthermore, many technologies are reaching their sensitivity limit and new approaches need to be developed to overcome the currently irreducible technological challenges. This situation is unfolding against a backdrop of declining funding for instrumentation, both at the national laboratories and in particular at the universities. This trend has to be reversed for the country to continue to play a leadership role in particle physics, especially in this most promising era of imminent new discoveries that could finally break the hugely successful, but limited, Standard Model of fundamental particle interactions. In this challenging environment it is essential that the community invest anew in instrumentation and optimize the use of the available resources to develop new innovative, cost-effective instrumentation, as this is our best hope to successfully accomplish the mission of high energy physics. This report summarizes the current status of instrumentation for high energy physics, the challenges and needs of future experiments and indicates high priority research areas.

   ↳ physics.ins-dethep-exnucl-ex6 citations
3. 03*

   A computational EXFOR database

   Georg Schnabel🇫🇷

   The EXFOR library is a useful resource for many people in the field of nuclear physics. In particular, the experimental data in the EXFOR library serves as a starting point for nuclear data evaluations. There is an ongoing discussion about how to make evaluations more transparent and reproducible. One important ingredient may be convenient programmatic access to the data in the EXFOR library from high-level languages. To this end, the complete EXFOR library can be converted to a MongoDB database. This database can be conveniently searched and accessed from a wide variety of programming languages, such as C++, Python, Java, Matlab, and R. This contribution provides some details about the successful conversion of the EXFOR library to a MongoDB database and shows simple usage examples to underline its merits. All codes required for the conversion have been made available online and are open-source. In addition, a Dockerfile has been created to facilitate the installation process.

   ↳ cs.DLnucl-exnucl-thphysics.comp-ph+1EPJ Web Conf.(2020)·2 citations
4. 04*

   How accurately we know the standard ${}^{252}$Cf(sf) neutron multiplicity?

   R. Capote🇦🇹 · D. Neudecker🇺🇸

   Small uncertainties obtained for the Neutron Standards have been associated with possible missing correlations in the input data, with an incomplete uncertainty budget of the employed experimental database or with unrecognized uncertainty sources common to many measurements. While further detailed studies may improve the first two issues, the issue of potential unrecognized uncertainties and correlations between different experiments has long been neglected. We address this gap with a test-case study ons the evaluation of the total neutron multiplicity of the ${}^{252}$Cf(sf) source, which is included in the evaluation of the Thermal Neutron Constants within the Neutron Standards.

   ↳ nucl-thnucl-exphysics.data-an1 citation

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.