Coulomb-nuclear interference: Theory and practice for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math> -scattering at 13 TeV

COULOMB INTERFERENCE IN HIGH-ENERGY pp AND ¯pp SCATTERING.

Scattering amplitudes at multi TeV energies

We show that a generalized Regge behaviour, Im F (s, t) ≃ Φ(t)(log s/ˆ s) ν(t) (s/ˆ s) α P (t) , for |t| < |t0|, s → ∞ where Φ(t) ≃ e bt , αP (t) ≃ αP (0) + α ′ P (0)t, and t0 is the first zero of αP (t), αP (t0) = 0, implies that the corresponding cross section is bounded by σtot(s) < (Const.) × log s/ˆ s. This growth, however, is not sufficient to fit the experimental cross sections. If, inst...

Nuclear interference effects in 8B sub-Coulomb breakup

The breakup of B on Ni below the Coulomb barrier was measured recently with the aim of determining the Coulomb breakup components. We reexamine this reaction, and perform one step quantum-mechanical calculations that include E1, E2 and nuclear contributions. We show that the nuclear contribution is by no means negligible at the intermediate angular range where data was taken. Our results indica...

Measuring Elastic Scattering in the Coulomb Nuclear Interference (CNI) Region in ATLAS – Total Cross Sections and Luminosity

The Large Hadron Collider (LHC) will provide proton-proton collisions for the experiments installed at the interaction points (IP). The ATLAS detector is designed to detect high pt reactions and will focus on the discovery of the Higgs boson and new physics. However ATLAS is now also complemented by detectors in the very forward region to measure small angle elastic scattering. This will give a...

Little String Theory at a TeV

We propose a framework where the string scale as well as all compact dimensions are at the electroweak scale ∼ TeV. The weakness of gravity is attributed to the small value of the string coupling gs ∼ 10, presumably a remnant of the dilaton’s runaway behavior, suggesting the possibility of a common solution to the hierarchy and dilaton-runaway problems. In spite of the small gs, in type II stri...