890 research outputs found
Is social identity belief independent?
In this paper we aim to disentangle the effects on in-group favoritism driven by beliefs from those stemming from group identity, with the final goal of testing the relative power of three potential explanations of this bias: The Beliefs Driven Explanation (BDE), the Group Identity Explanation (GIE) and the Belief-mediated Group Identity Explanation (BGE). The BDE suggests that in-group favoritism is only driven by the desire not to let others’ expectations down. The GIE claims that people have a preference, per se, for members of their group. According to the BGE, people also have a preference for members of their group, but this is mediated by their second-order beliefs. To this aim, we built an experimental design able to produce exogenous variations in both group membership and expectations, hence providing a genuine test for the rationale of in-group bias. The results of our experiment suggest that beliefs per se are not a significant explanation of in-group favoritism and hence do not provide support to the BDE. Our experimental evidence does not provide support also to the BGE. We conclude that our experiment suggests to single out the GIE as the most powerful explanation of social identity
Anthropologists, Italians and “human races”
This article is part of an international forum on raceand racism published by the Journal of Anthropological Sciences and edited by Alan Goodman of the New Hampshire College (USA). The paper presents an overview of the use and meaning of the term "human race" among Italian scholars, both on the biological and cultural side, in a historical perspective. The theme is also contextualized with respect to political and social current events
Mueller-Navelet jets at LHC: BFKL versus high-energy DGLAP
The production of forward jets separated by a large rapidity gap at LHC, the
so-called Mueller-Navelet jets, is a fundamental testfield for perturbative QCD
in the high-energy limit. Several analyses have already provided with evidence
about the compatibility of theoretical predictions, based on collinear
factorization and BFKL resummation of energy logarithms in the next-to-leading
approximation, with the CMS experimental data at 7 TeV of center-of-mass
energy. However, the question if the same data can be described also by
fixed-order perturbative approaches has not been yet fully answered. In this
paper we provide numerical evidence that the mere use of partially asymmetric
cuts in the transverse momenta of the detected jets allows a clear separation
between BFKL-resummed and fixed-order predictions in some observables related
with the Mueller-Navelet jet production process.Comment: 15 pages, 3 figures, 2 tables; slight change in the title; version to
appear on Eur. Phys. J. C. arXiv admin note: text overlap with
arXiv:1407.843
Dihadron production at the LHC: full next-to-leading BFKL calculation
The study of the inclusive production of a pair of charged light hadrons (a
"dihadron" system) featuring high transverse momenta and well separated in
rapidity represents a clear channel for the test of the BFKL dynamics at the
Large Hadron Collider (LHC). This process has much in common with the well
known Mueller-Navelet jet production; however, hadrons can be detected at much
smaller values of the transverse momentum than jets, thus allowing to explore
an additional kinematic range, supplementary to the one studied with
Mueller-Navelet jets. Furthermore, it makes it possible to constrain not only
the parton densities (PDFs) for the initial proton, but also the parton
fragmentation functions (FFs) describing the detected hadron in the final
state. Here, we present the first full NLA BFKL analysis for cross sections and
azimuthal angle correlations for dihadrons produced in the LHC kinematic
ranges. We make use of the Brodsky-Lapage-Mackenzie (BLM) optimization method
to set the values of the renormalization scale and study the effect of choosing
different values for the factorization scale. We also gauge the uncertainty
coming from the use of different PDF and FF parametrizations.Comment: 30 pages, 12 figures; added some text and two figures, marginal
change in Eq.(5) and in one of the figures; version published on Eur. Phys.
J.
Mueller-Navelet jets at 13 TeV LHC: dependence on dynamic constraints in the central rapidity region
We study the production of Mueller-Navelet jets at 13 TeV LHC, within
collinear factorization and including the BFKL resummation of energy logarithms
in the next-to-leading approximation. We calculate several azimuthal
correlations for different values of the rapidity separation between the
two jets and evaluate the effect of excluding those events where, for a given
, one of the two jets is produced in the central region.Comment: 27 pages, 8 figures, 7 tables; added some text and four references;
version accepted for publication on Eur. Phys. J. C; arXiv admin note: text
overlap with arXiv:1504.0823
NLO Evolution of Color Dipoles in N = 4 SYM
The small- deep inelastic scattering in the saturation region is
governed by the non-linear evolution of Wilson-line operators. In the leading
logarithmic approximation it is given by the BK equation for the evolution of
color dipoles. I discuss recent calculation of the next-to-leading order
evolution of color dipoles in QCD and SYM.Comment: 4 pages, Prepared for the International Workshop on Diffraction in
High-Energy Physics in La Londe-les-Maures, France, 9-14 September 200
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