724,694 research outputs found
Intrinsic bottom and its impact on heavy new physics at the LHC
Heavy quark parton distribution functions (PDFs) play an important role in
several Standard Model and New Physics processes. Most analyses rely on the
assumption that the charm and bottom PDFs are generated perturbatively by gluon
splitting and do not involve any non-perturbative degrees of freedom. On the
other hand, non- perturbative, intrinsic heavy quark parton distributions have
been predicted in the literature. We demonstrate that to a very good
approximation the scale-evolution of the intrinsic heavy quark content of the
nucleon is governed by non-singlet evolution equations. This allows to analyze
the intrinsic heavy quark distributions without having to resort to a
full-fledged global analysis of parton distribution functions. We exploit this
freedom to model intrinsic bottom distributions which are so far missing in the
literature. We estimate the impact of the non-perturbative contribution to the
charm and bottom-quark PDFs and on several important parton-parton luminosities
at the LHC.Comment: 6 pages, proceedings of POETIC VI: 6th International conference on
Physics Opportunities at Electron-Ion collider. arXiv admin note: substantial
text overlap with arXiv:1507.0893
Invariance of the relativistic one-particle distribution function
The one-particle distribution function is of importance both in
non-relativistic and relativistic statistical physics. In the relativistic
framework, Lorentz invariance is possibly its most fundamental property. The
present article on the subject is a contrastive one: we review, discuss
critically, and, when necessary, complete, the treatments found in the standard
literature
Dynamical density functional theory for interacting Brownian particles: stochastic or deterministic?
We aim to clarify confusions in the literature as to whether or not dynamical
density functional theories for the one-body density of a classical Brownian
fluid should contain a stochastic noise term. We point out that a stochastic as
well as a deterministic equation of motion for the density distribution can be
justified, depending on how the fluid one-body density is defined -- i.e.
whether it is an ensemble averaged density distribution or a spatially and/or
temporally coarse grained density distribution.Comment: 10 pages, 1 figure, to be submitted to Journal of Physics A:
Mathematical and Genera
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