Universality of soft and collinear factors in hard-scattering factorization

Universality in QCD factorization of parton densities, fragmentation functions, and soft factors is endangered by the process dependence of the directions of Wilson lines in their definitions. We find a choice of directions that is consistent with factorization and that gives universality between e^+e^- annihilation, semi-inclusive deep-inelastic scattering, and the Drell-Yan process. Universality is only modified by a time-reversal transformation of the soft function and parton densities between Drell-Yan and the other processes, whose only effect is the known reversal of sign for T-odd parton densities like the Sivers function. The modifications of the definitions needed to remove rapidity divergences with light-like Wilson lines do not affect the results.Comment: 4 pages. Extra references. Text and references as in published versio

A model-independent analysis of the dependence of the anomalous J/psi suppression on the number of participant nucleons

A recently published experimental dependence of the J/psi to Drell-Yan ratio on the measured, by a zero degree calorimeter, forward energy E_ZDC in Pb+Pb collisions at the CERN SPS is analyzed. Using a model-independent approach it is shown that the data are at variance with an earlier published experimental dependence of the same quantity on the transverse energy of neutral hadrons E_T. The discrepancy is related to a moderate centrality region: 100 < N_p < 200 (N_p is the number of participant nucleons) and is peculiar only to the data obtained within the `minimum bias' analysis (using the `theoretical Drell-Yan'). This could result from systematic experimental errors in the minimum bias sample. A possible source of the errors is discussed.Comment: 10 pages, LaTeX, 3 PS-figures. V2: Misprints are correcte

Polarized Drell-Yan at COMPASS-II: Transverse Spin Physics Program

Successful realization of polarized Drell-Yan physics program is one of the main goals of the second stage of the COMPASS experiment. Drell-Yan measurements with high energy (190 GeV/c) pion beam and transversely polarized NH3 target have been initiated by a pilot-run in the October 2014 and will be followed by 140 days of data taking in 2015. In the past twelve years COMPASS experiment performed series of SIDIS measurements with high energy muon beam and transversely polarized deuteron and proton targets. Results obtained for Sivers effect and other target transverse spin dependent and unpolarized azimuthal asymmetries in SIDIS serve as an important input for general understanding of spin-structure of the nucleon and are being used in numerous theoretical and phenomenological studies being carried out in the field of transvers-spin physics. Measurement of the Sivers and all other azimuthal effects in polarized Drell-Yan at COMPASS will reveal another side of the spin-puzzle providing a link between SIDIS and Drell-Yan branches. This will be a unique possibility to test universality and key-features of transverse momentum dependent distribution functions (TMD PDFs) using essentially same experimental setup and exploring same kinematic domain. In this review man physics aspects of future COMPASS polarized Drell-Yan measurement of azimuthal transverse spin asymmetries will be presented, giving a particular emphasis on the link with very recent COMPASS results obtained for SIDIS transverse spin asymmetries from four "Drell-Yan" $Q^2$-ranges.Comment: 6 pages, 7 plots. SPIN-2014, Beijing, China. arXiv admin note: text overlap with arXiv:1411.156

The extraction of nuclear sea quark distribution and energy loss effect in Drell-Yan experiment

The next-to-leading order and leading order analysis are performed on the differential cross section ratio from Drell-Yan process. It is found that the effect of next-to-leading order corrections can be negligible on the differential cross section ratios as a function of the quark momentum fraction in the beam proton and the target nuclei for the current Fermilab and future lower beam proton energy. The nuclear Drell-Yan reaction is an ideal tool to study the energy loss of the fast quark moving through cold nuclei. In the leading order analysis, the theoretical results with quark energy loss are in good agreement with the Fermilab E866 experimental data on the Drell-Yan differential cross section ratios as a function of the momentum fraction of the target parton. It is shown that the quark energy loss effect has significant impact on the Drell-Yan differential cross section ratios. The nuclear Drell-Yan experiment at current Fermilab and future lower energy proton beam can not provide us with more information on the nuclear sea quark distribution.Comment: 17 pages, 4 figure

KEBERLANJUTAN BIROKRASI KEMASYARAKATAN DESA SUKAWANA PADA MASA BALI KUNO: KAJIAN BERDASARKAN PRASASTI SUKAWANA D

The Sukawana D incription is one of culture inheritance as the remain of archaeology in Sukawana Village, Kintamani Sub-district, Bangli Regency issued by rulling governor king at the Ancient Bali time named Raja Patih Kbo Parud on 1222 saka (1300 AD). This research has purpose to answer the main problems are about bureaucracy element, and the continuity of the bureaucracy element to Sukawana Village based on data of Sukawana D incription. Related to the bureaucracy element obtained from this research is as the following. The bureaucracy structure of the central level consists of the king, the senapatis, the samgats, and the clergymen of Siwa and Buddha, whereas the bureaucracy structure in area level are the kab?yans that consist of Kab?yan Arg?, Kab?yan Tuha, Kab?yan T?a?, and Kab?yan oman. There are known the existence of continuity of bureaucracy element in area level that is still going on in the present time in Sukawana Village is the kab?yan.Prasasti Sukawana D merupakan salah satu warisan budaya berupa tinggalan arkeologi yang terdapat di Desa Sukawana, Kecamatan Kintamani, Kabupaten Bangli yang dikeluarkan oleh Raja Patih yang berkuasa pada masa Bali Kuno yaitu Raja Patih Kbo Parud pada tahun 1222 Saka (1300 Masehi). Penelitian ini bertujuan untuk menjawab permasalahan pokok, yaitu mengenai unsur birokrasi, dan keberlanjutan unsur birokrasi di Desa Sukawana berdasarkan data prasasti Sukawana D. Berkenaan dengan unsur-unsur birokrasi yang diperoleh dari penelitian ini adalah sebagai berikut. Struktur birokrasi tingkat pusat terdiri atas raja, para sen?pati, para samgat, dan para pemuka agama Siwa dan Buddha, sedangkan struktur birokrasi tingkat daerah, yaitu kab?yan yang terdiri atas kab?yan arg?, kab?yan tuha, kab?yan t?a?, dan kab?yan oman. Diketahui adanya beberapa keberlanjutan unsur birokrasi tingkat daerah yang masih berlangsung pada masa sekarang di Desa Sukawana, yaitu kab?yan