Počet záznamů: 1
QCD factorization at forward rapidities
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SYSNO ASEP 0486803 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV Záznam nebyl označen do RIV Název QCD factorization at forward rapidities Tvůrce(i) Nemchik, J. (SK)
Šumbera, Michal (UJF-V) RID, ORCID, SAICelkový počet autorů 2 Číslo článku 354 Zdroj.dok. 35th International Conference of High Energy Physics (ICHEP 2010). - Trieste : SISSA, 2010 Poč.str. 4 s. Forma vydání Tištěná - P Akce 35th International Conference of High Energy Physics (ICHEP 2010) Datum konání 22.07.2010 - 28.07.2010 Místo konání Paris Země FR - Francie Typ akce WRD Jazyk dok. eng - angličtina Země vyd. IT - Itálie Klíč. slova suppression ; collisions Vědní obor RIV BG - Jaderná, atomová a mol. fyzika, urychlovače Obor OECD Nuclear physics Institucionální podpora UJF-V - RVO:61389005 UT WOS 000392111500300 Anotace We analyze several reactions on nuclear targets at forward rapidities and different energies (at smallest experimentally accessible Bjorken x(2) in the target). Nuclear effects are then usually interpreted as a result of shadowing or the Color Glass Condensate. QCD factorization of soft and hard interactions requires the nucleus to be an universal filter for different Fock components of the projectile hadron. We demonstrate, however, that this is not the case in the vicinity of the kinematic limit, Feynman x(F) -> 1, where sharing of energy between the projectile constituents becomes an issue. The rise of suppression with x(F) is confirmed by the E772 and E886 data on the Drell-Yan and heavy quarkonium production. We show that this effect can be treated alternatively as an effective energy loss proportional to initial energy. This leads to a nuclear suppression at any energy, and predicts x(F) scaling of the suppression. We demonstrate also that the same kinematic limit can be approached in transverse momentum when the Cronin enhancement of particle production at medium-high p(T) switches to a suppression at larger p(T) violating thus QCD factorization. Such an unexpected effect seems to be confirmed by the RHIC data for pion production in d+A collisions, and even for direct photons in Au+Au collisions. Pracoviště Ústav jaderné fyziky Kontakt Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Rok sběru 2018
Počet záznamů: 1