Manage Criteria: Run conditions (server energy, ray intensity, address polarization, etc
Databases: Database host was treated by SpinQuest and you may regular pictures of the databases content try stored and the gadgets and you can records necessary due to their data recovery.
Diary Instructions: SpinQuest spends an electronic logbook system SpinQuest ECL that have a databases back-end was able from the Fermilab It office as well as the SpinQuest collaboration.
Calibration and Geometry database: Powering conditions, and also the detector calibration constants and you may detector geometries, was kept in a database from the Fermilab.
Analysis application source: Research investigation software is install within the SpinQuest repair and you may study package. Contributions to your package are from numerous supply, college or university teams, Fermilab profiles, off-web site laboratory collaborators, and you will businesses. Locally written application supply password and create data, as well as benefits of collaborators is stored in a variety administration program, git. Third-party software is handled by the software maintainers according to the supervision off the analysis Doing work Category. Resource password repositories and handled third party bundles are continuously supported doing the new School regarding Virginia Rivanna shop.
Documentation: Documentation is available online when it comes to posts often was able of the a material management system (CMS) such as an https://rabonacasinos.org/nl/bonus/ effective Wiki within the Github or Confluence pagers otherwise since the static internet sites. This article is backed up continually. Most other records on the software is marketed thru wiki users and include a combination of html and pdf data.
SpinQuest/E10twenty-three9 is a fixed-target Drell-Yan experiment using the Main Injector beam at Fermilab, in the NM4 hall. It follows up on the work of the NuSea/E866 and SeaQuest/E906 experiments at Fermilab that sought to measure the d / u ratio on the nucleon as a function of Bjorken-x. By using transversely polarized targets of NH12 and ND3, SpinQuest seeks to measure the Sivers asymmetry of the u and d quarks in the nucleon, a novel measurement aimed at discovering if the light sea quarks contribute to the intrinsic spin of the nucleon via orbital angular momentum.
While much progress has been made over the last several decades in determining the longitudinal structure of the nucleon, both spin-independent and -dependent, features related to the transverse motion of the partons, relative to the collision axis, are far less-well known. There has been increased interest, both theoretical and experimental, in studying such transverse features, described by a number of �Transverse Momentum Dependent parton distribution functions� (TMDs). T of a parton and the spin of its parent, transversely polarized, nucleon. Sivers suggested that an azimuthal asymmetry in the kT distribution of such partons could be the origin of the unexpected, large, transverse, single-spin asymmetries observed in hadron-scattering experiments since the 1970s [FNAL-E704].
Therefore it is maybe not unrealistic to assume the Sivers attributes also can differ
Non-no values of your own Sivers asymmetry were counted inside the partial-inclusive, deep-inelastic scattering tests (SIDIS) [HERMES, COMPASS, JLAB]. The fresh new valence up- and down-quark Siverse characteristics was in fact noticed as similar in proportions however, having contrary indication. Zero results are designed for the ocean-quark Sivers attributes.
Among those is the Sivers function [Sivers] which means the new correlation between your k
The SpinQuest/E1039 experiment will measure the sea-quark Sivers function for the first time. By using both polarized proton (NH12) and deuteron (ND3) targets, it will be possible to probe this function separately for u and d antiquarks. A predecessor of this experiment, NuSea/E866 demonstrated conclusively that the unpolarized u and d distributions in the nucleon differ [FNAL-E866], explaining the violation of the Gottfried sum rule [NMC]. An added advantage of using the Drell-Yan process is that it is cleaner, compared to the SIDIS process, both theoretically, not relying on phenomenological fragmentation functions, and experimentally, due to the straightforward detection and identification of dimuon pairs. The Sivers function can be extracted by measuring a Sivers asymmetry, due to a term sin?S(1+cos 2 ?) in the cross section, where ?S is the azimuthal angle of the (transverse) target spin and ? is the polar angle of the dimuon pair in the Collins-Soper frame. Measuring the sea-quark Sivers function will allow a test of the sign-change prediction of QCD when compared with future measurements in SIDIS at the EIC.