{"product_id":"understanding-the-nucleons-spin-structure-von-krzysztof-kurek","title":"Understanding the Nucleon's Spin Structure","description":"\u003cp\u003eA modern understanding of the nucleon's spin structure is presented. Polarisation dependent  deep inelastic experiments have shown that the helicity contribution of quarks to  the nucleon spin is much smaller than expected from the simple quark model. This observation and the role of the triangle anomaly lead to the  conclusion that  gluons - if  strongly polarised, might  solve the spin problem of the nucleon.   Therefore a direct gluon polarisation measurement is the one of  main goals of the COMPASS experiment spin physics programme.  New results for the gluon polarisation are obtained.  The results  strongly support the hypothesis, that the gluons inside the nucleon are weakly or not polarised. Therefore, the possible importance of quark and gluon angular momenta are discussed. A short review of the nucleon's spin structure  results obtained in a Lattice Quantum  Chromodynamics approach is presented. The concept that the presence of the angular momentum of quarks  inside nucleon is related to the spatial deformation of the quark densities in the transverse plane is also reviewed.\u003c\/p\u003e\u003cdiv class=\"aw-variant-hidden-subtitle-div\" id=\"aw-variant-subtitle-9783659260933\"\u003e\u003ch3\u003eThe Direct Gluon Polarisation Measurement  at the COMPASS Experiment\u003c\/h3\u003e\u003c\/div\u003e","brand":"Autorenwelt Shop","offers":[{"title":"Softcover - 9783659260933","offer_id":39485374529629,"sku":"9783659260933","price":68.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0622\/files\/6454f5e5-572a-471f-99ae-28e7579f2c91.jpg?v=1757567035","url":"https:\/\/shop.autorenwelt.de\/products\/understanding-the-nucleons-spin-structure-von-krzysztof-kurek","provider":"Autorenwelt Shop","version":"1.0","type":"link"}