22 research outputs found
略论《共产党宣言》中的马克思主义自由观
本文着眼于《共产党宣言》中若干与马克思主义自由观有关的论述,从马克思主义自由观的历史发展,信仰自由、宗教自由、政治自由等精神领域的自由、无产阶级争取自由的斗争,以及社会自由与个人自由的发展的关系等角度进行了一些探讨,并简要分析了个人自由的发展与社会自由的发展之间的关系的现实意义
W Plus Multiple Jets at the LHC with High Energy Jets
We study the production of a W boson in association with n hard QCD jets (for
n>=2), with a particular emphasis on results relevant for the Large Hadron
Collider (7 TeV and 8 TeV). We present predictions for this process from High
Energy Jets, a framework for all-order resummation of the dominant
contributions from wide-angle QCD emissions. We first compare predictions
against recent ATLAS data and then shift focus to observables and regions of
phase space where effects beyond NLO are expected to be large.Comment: 19 pages, 9 figure
Probing superfast quarks in nuclei through dijet production at the LHC
We investigate dijet production from proton-nucleus collisions at the Large
Hadron Collider (LHC) as a means for observing superfast quarks in nuclei with
Bjorken . Kinematically, superfast quarks can be identified through
directly measurable jet kinematics. Dynamically, their description requires
understanding several elusive properties of nuclear QCD, such as nuclear forces
at very short distances, as well as medium modification of parton distributions
in nuclei. In the present work, we develop a model for nuclear parton
distributions at large in which the nuclear dynamics at short distance
scales are described by two- and three-nucleon short range correlations (SRCs).
Nuclear modifications are accounted for using the color screening model, and an
improved description of the EMC effect is reached by using a structure function
parametrization that includes higher-twist contributions. We apply QCD
evolution at the leading order to obtain nuclear parton distributions in the
kinematic regime of the LHC, and based on the obtained distributions calculate
the cross section for dijet production. We find not only that superfast quarks
can be observed at the LHC, but also that they provide sensitivity to the
practically unexplored three-nucleon SRCs in nuclei. Additionally, the LHC can
extend our knowledge of the EMC effect to large where higher-twist
effects are negligible.Comment: 44 pages, 17 figures, final version to be published in EJP
A fourth generation, anomalous like-sign dimuon charge asymmetry and the LHC
A fourth chiral generation, with in the range GeV and a moderate value of the CP-violating phase can explain the
anomalous like-sign dimuon charge asymmetry observed recently by the D0
collaboration. The required parameters are found to be consistent with
constraints from other and decays. The presence of such quarks, apart
from being detectable in the early stages of the LHC, would also have important
consequences in the electroweak symmetry breaking sector.Comment: 18 pages, 9 figures, Figure 1 is modified, more discussions are added
in section 2. new references adde
Comments from Direct Photon Round Table Discussion
This paper discusses direct photons as a result of hadron collisions, including theoretical predictions, experimental results, and directions for future work. 9 refs., 1 fig. (LSP