Focus on Criteria: Focus on conditions (servers time, beam intensity, target polarization, etc

Databases: Databases host was treated by SpinQuest and you may regular snapshots of the databases posts try stored as well as the units and you may records expected due to their recuperation.

Record Instructions: SpinQuest uses a digital logbook program SpinQuest ECL with a database back-prevent managed by the Fermilab It office and SpinQuest collaboration.

Calibration and you may Geometry databases: Running standards, and the alarm calibration constants and you can sensor geometries, are kept in a database within Fermilab.

Analysis application provider: Research studies software is create within the SpinQuest repair and you will studies plan. Contributions for the package come from numerous source, college or university organizations, Fermilab pages, off-web site laboratory collaborators, and you can businesses. In your community created software source password and create records, in addition to contributions regarding collaborators was kept in a variation management program, git. Third-team software program is addressed because of the app maintainers under the oversight regarding the analysis Doing work Classification. Supply password repositories and you can treated third party packages are continuously supported doing the fresh new University out of Virginia Rivanna stores.

Documentation: visit the site Records exists online in the way of articles possibly was able by a material management program (CMS) such as good Wiki in the Github or Confluence pagers otherwise while the static web pages. This article was supported continuously. Other documentation towards software is distributed thru wiki users and you can contains a mix of html and you may pdf records.

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 NH_twenty-three 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 k_T 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].

So it’s perhaps not unrealistic to assume your Sivers services also can disagree

Non-zero thinking of Sivers asymmetry was basically measured inside the semi-comprehensive, deep-inelastic sprinkling experiments (SIDIS) [HERMES, COMPASS, JLAB]. The latest valence up- and off-quark Siverse services were observed is similar in dimensions but with opposite sign. Zero email address details are available for the ocean-quark Sivers services.

Among those ‘s the Sivers mode [Sivers] and that is short for the latest correlation between the k

The SpinQuest/E1039 experiment will measure the sea-quark Sivers function for the first time. By using both polarized proton (NH₃) 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.