Databases: Database host is managed by SpinQuest and you may normal snapshots of your own databases posts try stored in addition to the gadgets and you will documentation requisite due to their recuperation.
Log Books: SpinQuest spends a digital logbook system SpinQuest ECL which have a database back-stop managed from the Fermilab It section and also the SpinQuest collaboration.
Calibration and you can Geometry database: Running standards, as well as the detector calibration constants and you may sensor geometries, was stored in a databases at Fermilab.
Research software provider: Analysis data software program is create inside the SpinQuest reconstruction and research package. Benefits to your package come from multiple provide, college teams, Fermilab profiles, off-site laboratory collaborators, and you may businesses. In your area composed software provider password and construct data files, along with efforts out of collaborators try stored in a difference management system, git. Third-cluster application is managed because of the software maintainers according to the supervision off the analysis Functioning Class. Origin password repositories and you can addressed alternative party bundles are constantly recognized to the fresh new University away from Virginia Rivanna stores.
Documentation: Records can be found on the internet in the golden euro casino way of content sometimes handled by a material administration program (CMS) such an excellent Wiki within the Github otherwise Confluence pagers otherwise because the fixed internet sites. This content was copied constantly. Other documentation for the software is distributed through wiki pages and you will include a mix of html and pdf records.
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 NH3 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 perhaps not unreasonable to imagine that Sivers attributes can also disagree
Non-no philosophy of your Sivers asymmetry was counted inside the partial-inclusive, deep-inelastic sprinkling experiments (SIDIS) [HERMES, COMPASS, JLAB]. The newest valence right up- and you can off-quark Siverse functions was noticed to be equivalent in proportions but with reverse sign. No answers are designed for the sea-quark Sivers characteristics.
Some of those ‘s the Sivers mode [Sivers] and that stands for the newest relationship between the k
The SpinQuest/E10twenty-three9 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.
