- By Sheraz
- November 19, 2025
Databases: Databases server is treated from the SpinQuest and you will typical snapshots of one’s database stuff are kept and the gadgets and records needed because of their recuperation.
Log Courses: SpinQuest uses an electronic logbook system SpinQuest ECL that have a database back-prevent was able from the Fermilab It section plus the SpinQuest collaboration.
Calibration and you will Geometry databases: Running requirements, and the detector calibration constants and you may sensor geometries, is actually kept in a database during the Fermilab.
Research application resource: Studies study software program is set-up in the SpinQuest repair and study bundle. Benefits to your package come from multiple supplies, university teams, Fermilab profiles, off-site research collaborators, and businesses. In playmillion bonus Nederland your area written app provider password and construct data files, along with benefits out of collaborators try stored in a variation administration program, git. Third-party software program is treated from the application maintainers within the supervision of the analysis Functioning Category. Origin code repositories and you may handled alternative party packages are continuously recognized around the brand new University out of Virginia Rivanna storage.
Documentation: Records is obtainable on line in the form of content often handled by the a material administration system (CMS) including a good Wiki inside the Github otherwise Confluence pagers or while the fixed website. This content is copied continuously. Almost every other records to the application is marketed through wiki pages and you may consists of a mix of html and you may pdf files.
SpinQuest/E10129 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].
Non-zero viewpoints of one’s Sivers asymmetry had been measured in the partial-inclusive, deep-inelastic scattering tests (SIDIS) [HERMES, COMPASS, JLAB]. The newest valence right up- and you can down-quark Siverse functions was in fact noticed getting comparable in dimensions but that have reverse sign. Zero email address details are readily available for the sea-quark Sivers characteristics.
The SpinQuest/E1039 experiment will measure the sea-quark Sivers function for the first time. By using both polarized proton (NHtwenty three) 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.
