69,921 research outputs found
Non-dipolar gauge links for transverse-momentum-dependent pion wave functions
I discuss the factorization-compatible definitions of
transverse-momentum-dependent (TMD) pion wave functions which are fundamental
theory inputs entering QCD factorization formulae for many hard exclusive
processes. I will first demonstrate that the soft subtraction factor introduced
to remove both rapidity and pinch singularities can be greatly reduced by
making the maximal use of the freedom to construct the Wilson-line paths when
defining the TMD wave functions. I will then turn to show that the newly
proposed TMD definition with non-dipolar Wilson lines is equivalent to the one
with dipolar gauge links and with a complicated soft function, to all orders of
the perturbative expansion in the strong coupling, as far as the infrared
behavior is concerned.Comment: 7 pages, 3 figure
Search for Higgs, Leptoquarks, and Exotics at Tevatron
This paper reviews some of the most recent results from the CDF and DZERO
experiments on the searches for Standard Model and Non-Standard Model Higgs
bosons, and other new phenomena at the Tevatron. Both experiments examine data
from proton anti-proton collision at sqrt{s} = 1.96 TeV, of integrated
luminosity ~200$ pb**-1 (per experiment), to search for Higgs predicted in the
Standard Model and beyond Standard Model, supersymmetric particles in the Gauge
Mediated Symmetry Breaking scenario, leptoquarks, and excited electrons. No
signal was observed, and limits on the signatures and models are derived.Comment: Contribution to the proceedings of the XXXIX Recontres de Moriond on
Electroweak Interactions and Unified Theorie
Factorization, resummation and sum rules for heavy-to-light form factors
Precision calculations of heavy-to-light form factors are essential to
sharpen our understanding towards the strong interaction dynamics of the
heavy-quark system and to shed light on a coherent solution of flavor
anomalies. We briefly review factorization properties of heavy-to-light form
factors in the framework of QCD factorization in the heavy quark limit and
discuss the recent progress on the QCD calculation of form factors
from the light-cone sum rules with the -meson distribution amplitudes.
Demonstration of QCD factorization for the vacuum-to--meson correlation
function used in the sum-rule construction and resummation of large logarithms
in the short-distance functions entering the factorization theorem are
presented in detail. Phenomenological implications of the newly derived sum
rules for form factors are further addressed with a particular
attention to the extraction of the CKM matrix element .Comment: 6 pages, 3 figures, proceedings prepared for the "QCD@work 2016",
(27-30 June 2016, Martina Franca, Italy
- …