6,324 research outputs found
Elastic and Diffractive Scattering after AdS/CFT
At high energies, elastic hadronic cross sections are believed to be
dominated by vacuum exchange. In leading order of the leading expansion
this exchange process has been identified as the BFKL {\em Pomeron} or its
strong AdS dual the closed string graviton \cite{Brower:2006ea}. However
difference of particle anti-particle cross sections are given by a so-called
{\em Odderon} carrying C = -1 quantum numbers identified in weak coupling with
odd numbers of exchanged gluons. Here we show that the dual description
associates this with the Neveu-Schwartz () sector of closed string
theory. We also discuss the extension of the strong coupling treatment to
central diffractive Higgs production at LHC.Comment: 7 pages, 3 figures; presented at International Conference on Elastic
and Diffractive Scattering, EDS'09, CERN, July 3, 200
Saturation and Confinement: Analyticity, Unitarity and AdS/CFT Correspondence
In expansion, analyticity and crossing lead to crossing even and odd
() vacuum exchanges at high-energy, the {\em Pomeron} and the {\em
Odderon}. We discuss how, using {\em String/Gauge duality}, these can be
identified with a reggeized {\em Graviton} and the anti-symmetric {\em
Kalb-Ramond fields} in background. With confinement, these Regge
singularities interpolate with glueball states. We also discuss unitarization
based on eikonal sum in .Comment: more references added. presented at ISMD 2008, 15-20 Sept. 200
Inclusive Production Through AdS/CFT
It has been shown that AdS/CFT calculations can reproduce certain exclusive
2->2 cross sections in QCD at high energy, both for near-forward and for
fixed-angle scattering. In this paper, we extend prior treatments by using
AdS/CFT to calculate the inclusive single-particle production cross section in
QCD at high center-of-mass energy. We find that conformal invariance in the UV
restricts the cross section to have a characteristic power-law falloff in the
transverse momentum of the produced particle, with the exponent given by twice
the conformal dimension of the produced particle, independent of incoming
particle types. We conclude by comparing our findings to recent LHC
experimental data from ATLAS and ALICE, and find good agreement.Comment: JHEP version. Discussion, appendix, figures, and tables added.
Conclusions and key results unchange
Magnetic monopole loop for the Yang-Mills instanton
We investigate 't Hooft-Mandelstam monopoles in QCD in the presence of a
single classical instanton configuration. The solution to the Maximal Abelian
projection is found to be a circular monopole trajectory with radius
centered on the instanton. At zero loop radius, there is a marginally stable
(or flat) direction for loop formation to . We argue that loops
will form, in the semi-classical limit, due to small perturbations such as the
dipole interaction between instanton anti-instanton pairs. As the instanton gas
becomes a liquid, the percolation of the monopole loops may therefore provide a
semi-classical precursor to the confinement mechanism.Comment: 19 pages, ReVTeX, 5 Encaptulated Postscript figure
- …