EPJ Web Conf.
Volume 138, 2017XXIII International Baldin Seminar on High Energy Physics Problems Relativistic Nuclear Physics and Quantum Chromodynamics (Baldin ISHEPP XXIII)
|Number of page(s)||6|
|Section||Polarization phenomena, spin physics|
|Published online||27 March 2017|
On possible contribution of partons’ orbital momentum to the proton spin
Joint Institute for Nuclear Research, Dubna, Russian Federation
* e-mail: email@example.com
Published online: 27 March 2017
Virtual parton excitations of proton achieve status of real particles after transition into the infinite momentum frame. In particular, QCD evolution of them should respect the conservation laws which in turn should be a necessary consequence of symmetry properties. I argue that these simple reasons may cast light on the so-called proton spin puzzle and upon an orbital momentum contribution of quarks and gluons to the proton spin. An already fulfilled experiment with a hint on possible observation of orbital excitations of gluons is pointed out.
© The Authors, published by EDP Sciences, 2017
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