Results 61 to 70 of about 72,009 (264)

A Linear Sigma Model with Three Flavors and Vector and Axial-Vector Mesons

, 2010
We outline the extension of the globally chirally invariant Nf = 2 linear sigma model with vector and axial-vector degrees of freedom to Nf=3. We present preliminary results concerning the scalar meson masses.Comment: Prepared for the Proceedings of the ...
Giacosa, Francesco, Kovacs, Peter, Parganlija, Denis, Rischke, Dirk H., Wolf, Gyorgy   +4 more
core   +1 more source

Vector Meson Production at HERA [PDF]

, 1997
We show that the lowest-order QCD calculation in a simple model of elastic vector-meson production does reproduce correctly the ratios of cross sections for rho, phi and J/psi, both in photoproduction and in high-Q2 quasi-elastic scattering.
Ahmed, Aid, Aid, Arneodo, Arneodo, Arneodo, Brodsky, Covolan, Cudell, Cudell, Cudell, Cudell, Cudell, Derrick, Derrick, Derrick, Donnachie, Donnachie, Donnachie, Donnachie, Donnachie, Gunion, Henty, Horgan, I Royen, J.R Cudell, Laget, Landshoff, Levin, Low, Martin, Nemchik, Nussinov, Ryskin, Ryskin, Sandacz, Sandacz   +36 more
core   +3 more sources

Biological Flora of Britain and Ireland: Geranium sylvaticum*

Journal of Ecology, Volume 114, Issue 2, February 2026.
Geranium sylvaticum is a perennial forb of upland grasslands, woodlands and riverbanks in northern Britain, with scattered native occurrences also in Wales, central England and Northern Ireland. It has an extensive native range in Europe and Asia. The species is gynodioecious, with individual plants typically female or hermaphrodite.
Markus Wagner, Richard G. Jefferson, Ruth E. Starr‐Keddle, Sandra Varga, Irina Tatarenko, Duncan B. Westbury, Lucy Hulmes   +6 more
wiley   +1 more source

Charged vector mesons in a strong magnetic field

, 2013
We show that charged vector mesons cannot be condensed by a magnetic field. Although some hadron models predict the charged vector meson condensation in a strong magnetic field, we prove, by means of the Vafa-Witten theorem, that this is not the case in ...
Hidaka, Yoshimasa, Yamamoto, Arata
core   +1 more source

Axial, induced pseudoscalar, and pion-nucleon form factors in manifestly Lorentz-invariant chiral perturbation theory [PDF]

, 2006
We calculate the nucleon form factors G_A and G_P of the isovector axial-vector current and the pion-nucleon form factor G_piN in manifestly Lorentz-invariant baryon chiral perturbation theory up to and including order O(p^4). In addition to the standard
J. Gegelia, K. S. Kuzmin, M. R. Schindler, S. Scherer, S. Scherer, T. Fuchs   +5 more
core   +2 more sources

An integrated social–ecological–evolutionary–phenotypic (SEEP) approach to understanding animal responses to urbanization

Biological Reviews, Volume 101, Issue 1, Page 419-436, February 2026.
ABSTRACT Humans play key roles in shaping the structure and processes of ecosystems globally, especially in cities. This recognition has prompted a recent focus on understanding urban systems via interactions between human social systems and ecological and evolutionary processes.
Kevin E. McCluney, Pierre Deviche, Karen L. Sweazea, Elizabeth J. Carlen, Jeffrey A. G. Clark, Aaron M. Grade, Jeffrey D. Haight, Chase Niesner, Shaylynn Trego, Katherine C.B. Weiss   +9 more
wiley   +1 more source

Dilepton production in proton-proton reaction at 4.5 GeV with the HADES spectrometer [PDF]

EPJ Web of Conferences
Spectra of dileptons emitted in hadron collisions are important tool to study electromagnetic decays of resonances and the validity of the Vector Meson Dominance model.
Abou Yassine Rayane
doaj   +1 more source

Information on the structure of the rho meson from the pion form-factor

, 2009
The electromagnetic pion form-factor is calculated in a Bethe-Salpeter approach which accounts for pion rescattering. In the scattering kernel the pion-pion contact interaction from lowest-order chiral perturbation theory is considered together with an ...
F. Klingl, S. Leupold
core   +1 more source

Exclusive diffractive processes and the quark substructure of mesons [PDF]

, 1996
Exclusive diffractive processes on the nucleon are investigated within a model in which the quark-nucleon interaction is mediated by Pomeron exchange and the quark substructure of mesons is described within a framework based on the Dyson-Schwinger ...
A. Bashir, A. Bender, A. C. Irving, A. D. Martin, A. Donnachie, A. Donnacie, C. D. Roberts, C. D. Roberts, C. J. Burden, C. W. Akerlof, C. W. Akerlof, D. Aston, D. P. Barber, D. P. Barber, F. E. Low, H. G. Dosch, H. J. Behrend, I. F. Ginzburg, J. B. D. Collins, J. Ballam, J. J. Aubert, J. S. Ball, J.-M. Laget, K. Schilling, L. Frankfurt, L. Montanet, M. A. Pichowsky, M. A. Pichowsky, M. Arneodo, M. Derrick, M. Derrick, M. Derrick, M. Derrick, M. Derrick, M. R. Frank, M. R. Frank, P. C. Tandy, P. Jain, R. Alkofer, R. M. Egloff, R. Macheleidt, S. Aid, S. J. Brodsky, S. Nussinov, T. Sato, T.-S. H. Lee, W. D. Shambroom, W. Struczinski   +47 more
core   +2 more sources

Selection maintains floral color polymorphism in scarlet paintbrush, Castilleja coccinea, reflecting combined ecological factors

American Journal of Botany, Volume 113, Issue 1, January 2026.
Abstract Premise Evolutionary theory predicts polymorphism should be rare; however, intraspecific variation in floral color is common and can be attributed to genetic drift, plasticity, or variable selection. Examining floral color polymorphism both within contact zones and across a species' range can reveal the mechanisms maintaining this variation ...
Emma Fetterly, Anna S. Braum, Chloe (Eun Sun) Kim, Katherine E. Wenzell, Mary V. Ashley, Laura Steger, Jeremie B. Fant   +6 more
wiley   +1 more source