Results 41 to 50 of about 76,116 (260)

Tuning the Circularly Polarized Reflection from Cholesteric Hydroxypropyl Cellulose Using Molecular Photoswitches

open access: yesAngewandte Chemie, Volume 138, Issue 1, 2 January 2026.
Molecular photoswitches dispersed in a cholesteric hydroxypropyl cellulose mesophase enable reversible, light‐driven tuning of structural color and polarization. Enantiomer‐specific effects and light‐responsive patterning highlight the potential of dynamic, cellulose‐based photonic materials.
Fathy Hassan   +8 more
wiley   +2 more sources

Are Parton distributions positive? [PDF]

open access: yesNuclear Physics B - Proceedings Supplements, 1999
We show that the naive positivity conditions on polarized parton distributions which follow from their probabilistic interpretation in the naive parton model are reproduced in perturbative QCD at the leading log level if the quark and gluon distribution are defined in terms of physical processes. We show how these conditions are modified at the next-to-
Forte, Stefano   +2 more
openaire   +2 more sources

Generalized parton distributions and double distributions for q q-bar pions [PDF]

open access: yes, 2002
We consider two simple covariant models for pions (one with scalar and the other with spin-1/2 constituents). Pion generalized parton distributions are derived by integration over the light-cone energy.
A. Mukherjee   +40 more
core   +2 more sources

Wigner Functions and Quark Orbital Angular Momentum

open access: yesEPJ Web of Conferences, 2015
Wigner distributions contain combined position and momentum space information of the quark distributions and are related to both generalized parton distributions (GPDs) and transverse momentum dependent parton distributions (TMDs).
Mukherjee Asmita   +2 more
doaj   +1 more source

Measurement of double-parton scattering in inclusive production of four jets with low transverse momentum in proton-proton collisions at s $$ \sqrt{s} $$ = 13 TeV

open access: yesJournal of High Energy Physics, 2022
A measurement of inclusive four-jet production in proton-proton collisions at a center-of-mass energy of 13 TeV is presented. The transverse momenta of jets within |η| < 4.7 are required to exceed 35, 30, 25, and 20 GeV for the first-, second-, third ...
The CMS collaboration   +2347 more
doaj   +1 more source

Collinear and TMD distributions with dynamical soft-gluon resolution scale

open access: yesJournal of High Energy Physics
Soft-gluon resolution scales characterize parton branching Monte Carlo implementations of the evolution equations for parton distribution functions in Quantum Chromodynamics (QCD).
F. Hautmann   +4 more
doaj   +1 more source

Universality of the EMC Effect

open access: yes, 2005
Using effective field theory, we investigate nuclear modification of nucleon parton distributions (for example, the EMC effect). We show that the universality of the shape distortion in nuclear parton distributions (the factorisation of the Bjorken x and
Arndt   +45 more
core   +1 more source

Multiple Parton Scattering in Nuclei: Parton Energy Loss [PDF]

open access: yes, 2001
Multiple parton scattering and induced parton energy loss is studied in deeply inelastic scattering (DIS) off nuclei. The effect of multiple scattering of a highly off-shell quark and the induced parton energy loss is expressed in terms of the ...
Airapetian   +38 more
core   +4 more sources

TMD parton distributions from parton showers [PDF]

open access: yesProceedings of XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2019), 2019
We present the determination of Transverse Momentum Dependent (TMD) parton distributions from Monte Carlo parton showers. We investigate the effective TMD distributions obtained from the PYTHIA8 and HERWIG6 parton showers and compare them to the TMD distributions determined within the Parton Branching method.
Schmitz, Melanie   +3 more
openaire   +3 more sources

Assessing the intensity of Late Quaternary humid phases in the Nefud Desert, northern Arabia

open access: yesJournal of Quaternary Science, EarlyView.
ABSTRACT The climate history of the major dryland zones of the world, such as the Saharo–Arabian Desert belt, plays a key role in the dispersal of early humans through these intermittently inhospitable regions. Here, we assess the relative intensity of Late Quaternary humid phases in northern Arabia through lithological, geochemical, palaeoecological ...
Richard Clark‐Wilson   +9 more
wiley   +1 more source

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