56,308 research outputs found
Upsilon Production In pp Collisions For Forward Rapidities At LHC
This is a continuation of recent studies of production at the
LHC in pp collisions. Our previous studies were for rapidity y=-1 to 1 for the
CMS detector, while the present study is for y=2.5 to 4.0 at the LHC.Comment: 5 pages, 2 figure
pi-Xi correlations in d+Au and Au+Au collisions at STAR
Qualitative comparison of source sizes from pi-Xi correlations analyses in
d+Au and Au+Au collisions at sqrt(s_NN)=200G GeV and sqrt(s_NN)=62 GeV is
presented. For the most central Au+Au collisions at sqrt(s_NN)=200 GeV we
report first quantitative results concerning size of the pi-Xi source and
relative shift of the average emission points between pi and Xi showing that
the homogeneity region of Xi source is smaller then that of pion and
significantly shifted in the transverse direction.Comment: prepared for the poster-session proceedings of the 19th International
Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (QM2006
Absorption of angular momentum by black holes and D-branes
We consider the absorption of higher angular momentum modes of scalars into
black holes, at low energies, and ask if the resulting cross sections are
reproduced by a D-brane model. To get the correct dependence on the volume of
the compactified dimensions, we must let the absorbing element in the brane
model have a tension that is the geometric mean of the tensions of the D-string
and an effective stringlike tension obtained from the D-5-brane; this choice is
also motivated by T-duality. In a dual model we note that the correct
dependence on the volume of the compact dimensions and the coupling arise if
the absorbing string is allowed to split into many strings in the process of
absorbing a higher angular momentum wave. We obtain the required energy
dependence of the cross section by carrying out the integrals resulting from
partitioning the energy of the incoming quantum into vibrations of the string.Comment: harvmac, 25 page
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