#BACA KOMIK KARYA TONY WONG CHEN FREE#

In QCD when gluon interactions between the annihilating quark and antiquark are taken into account the formula for the differential cross section acquires corrections of order Î±sub(s)(Q 2 ).

#BACA KOMIK KARYA TONY WONG CHEN FREE#

The theorem holds exactly in the free parton model.

The factorization theorem, applied to the Drell- Yan process, gives a formula for the differential cross section for the Drell- Yan process p + p â†’ Î¼ + Î¼ - X. In this review, results of the first ever measurements of the polarized Drell- Yan reaction performed by COMPASS are presented. The measurement of the Sivers and other azimuthal asymmetries in polarized SIDIS and Drell- Yan performed by COMPASS provides a unique possibility to test (pseudo-)universal features of transverse momentum-dependent parton distribution functions, predicted in QCD. Drell- Yan measurements with a 190 GeV/c $\pi^-$ beam impinging on a transversely polarized NH3 target started in the year 2015 (18 weeks data taking) and will be continued in 2018. An important part of the physics programme of the experiment is the exploration of the transverse spin structure of the nucleon via measurements of spin-(in)dependent azimuthal asymmetries in the semi-inclusive DIS and, recently, also in Drell- Yan processes. Jagiellonian University Polarized Drell- Yan measurements at COMPASSĬOMPASS is a fixed-target experiment operating on north area of SPS (M2 beamline) at CERN. Overall we find that the absolute Drell- Yan cross sections in the regions of interest are very small experimental study of the process will be difficult The background from Bethe-Heitler pairs is also calculated it is somewhat suppressed by going to y=0, and further suppressed relative to the Drell- Yan contribution for fixed Q 2 by looking at high center-of-mass energies and at small Q/sub perpendicular/ for the pair. Contributions to the process from both the nonhadronic anomaly and the vector-dominance piece are estimated: we find that the cross section from the anomaly dominates the vector-dominance contribution at large Q 2. We investigate the Drell- Yan reaction Î³p â†’ (Î¼ + Î¼ - ) X with an eye to experimental determination of the photon structure functions.

International Nuclear Information System (INIS) Photoproduction of Drell- Yan lepton pairs The experimental set-up, the status of the data taking in 2015 and preliminary analysis results in the 2. The role of the Drell- Yan experiment at COMPASS in TMD PDFs study, with a comparison to semi-inclusive deep inelastic scattering experiment, is described. After a plot run in 2014, the experiment has just started in 2015. The transversely polarized target together with negative pion beam is an important feature of the COMPASS Drell- Yan experiment, that provides us with unique data on transverse momentum dependent (TMD) PDFs. Study of angular dependencies of the Drell- Yan process cross-section allows us to access to parton distribution functions (PDFs) or, more precisely, a convolutions of various PDFs. The availability of pion beam provides an access to the Drell- Yan physics throughout the process where quark(target)-antiquark(beam) pair annihilates electromagnetically with a production of dilepton pair. The COMPASS II started at 2012 that includes polarized Drell- Yan program with a polarized solid target. This complicates our understanding of any lag between insolation forcing and monsoon response. East Asian monsoon grainâ€size and magnetic susceptibility records also show several differences between independently dated loess sites.

in many other OSLâ€dated Loess Plateau sites. The last glacial maximum peak MAR (22â€“27 ka) matches the Pacific and Greenland dust flux records, although appears earlier than peak MARs seen. MARs from undisturbed portions of Xifeng vary dramatically, with peaks potentially matching the timing of Heinrich events. Stevens, Thomas Buylaert, Jan-Pieter Lu, HuayuĬommon than previously realized. Mass accumulation rate and monsoon records from Xifeng, Chinese Loess Plateau, based on a luminescence age model Beijing : Zhongguo she hui ke xue chu ban she, 2008 Han yu yu bei Ou yu yan : Han yu yu Wula'er yu yan ji Yin Ou yu yan tong yuan tan jiu = Chinese language and languages of northern Europe.

Baca komik karya tony wong chen