Ultravisible warped model from flavor triviality and improved naturalness
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Delaunay, Cédric↗
Engineering topics
Lee, Seung J
Publications and source records attributed to Lee, Seung J.
Long-Distance Dominance of the CP Asymmetry in B{yields}X{sub s,d{gamma}} Decays
We show that in the standard model the parametrically leading (by a factor 1/{alpha}{sub s}) contribution to the inclusive CP asymmetry in B{yields}X{sub s,d{gamma}} decays arises from a long-distance effect in the interference of the electromagnetic dipole amplitude with the amplitude for an up-quark penguin transition accompanied by soft gluon emission. Using model estimates for the associated hadronic parameter {Lambda}-tilde{sub 17}{sup u}, we predict a value in the range -0.6%<A{sub X{sub s{gamma}}}{sup SM}<2.8%. In view of current experimental data, a future precision measurement of the flavor-averaged CP asymmetry would signal the presence of new physics only if a value below -2% was found. A cleaner probe of new physics is offered by the difference of the CP asymmetries in charged versus neutral B{yields}X{sub s{gamma}} decays.
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSIC↗
Template overlap method for massive jets
We introduce a new class of infrared safe jet observables, which we refer to as template overlaps, designed to filter targeted highly-boosted particle decays from QCD jets and other background. Template overlaps are functional measures that quantify how well the energy flow of a physical jet matches the flow of a boosted partonic decay. Any region of the partonic phase space for the boosted decays defines a template. We will refer to the maximum functional overlap found this way as the template overlap. To illustrate the method, we test lowest-order templates designed to distinguish highly-boosted top and Higgs decays from backgrounds produced by event generators. For the functional overlap, we find good results with a simple construction based on a Gaussian in energy differences within angular regions surrounding the template partons. Although different event generators give different averages for our template overlaps, we find in each case excellent rejection power, especially when combined with cuts based on jet shapes. The template overlaps are capable of systematic improvement by including higher-order corrections in the template phase space.
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗