Search results for " pion"
showing 10 items of 44 documents
Neuvosto-Viron pioneerijärjestön ja Suomen Demokratian Pioneerien Liiton kanssakäyminen liennytyksestä Prahan kevääseen
2011
Tutkielmassa käsitellään Neuvosto-Viron pioneerijärjestön ja Suomen Demokratian Pioneerien Liiton (SDPL) välisiä suhteita vuosina 1955–1968. Työn keskeisin kysymys koskee sitä, minkälaista ideologista sekä toiminnallista kanssakäymistä oli Neuvosto-Viron pioneerijärjestön ja Suomen Demokratian Pioneerien Liiton välillä. Ja ennen kaikkea mitä kanssakäymisellä haettiin sekä minkälaisiin tuloksiin lopulta päästiin? Tutkimuksessa haetaan myös vertailevilla ja lähdekriittisillä tutkimusmenetelmillä vastausta kysymykseen, millaisia eroja tai yhtäläisyyksiä oli poliittisesti vastakkaisiin leireihin kuuluneiden maiden pioneerijärjestöjen toimintojen ja toimintaperiaatteiden välillä. Oliko pioneeris…
Electromagnetic interactions of light hadrons in covariant chiral perturbation theory
2017
Las interacciones entre hadrones ligeros y campos de fotones son importantes para el estudio de la estructura de la materia y de la interacción fuerte. Sus propiedades fundamentales son descritas por la cromodinámica quántica (QCD). A energı́as elevadas, esta teorı́a ya ha sido bien comprobada con métodos perturbativos que tienen los quarks y gluones como grados de libertad. Sin embargo, a bajas energı́as, QCD es no-perturbativa y quedan muchos detalles por entender. Estas on precisamente las energı́as necesarias para describir interacciones entre hadrones a distancias superiores a su tamaño. Procesos que involucran interacciones con hadrones han sido extensamente estudiados a lo largo de l…
Search for a common baryon source in high-multiplicity pp collisions at the LHC
2020
Physics letters / B B811, 135849 (2020). doi:10.1016/j.physletb.2020.135849
Multiplicity dependence of the average transverse momentum in pp, p–Pb, and Pb–Pb collisions at the LHC
2013
The average transverse momentum $\langle p_{\rm T}\rangle$ versus the charged-particle multiplicity $N_{\rm ch}$ was measured in p-Pb collisions at a collision energy per nucleon-nucleon pair $\sqrt{s_{\rm NN}}=5.02$ TeV and in pp collisions at collision energies of $\sqrt{s}=0.9$, 2.76, and 7 TeV in the kinematic range $0.15<p_{\rm T}<10.0$ GeV/$c$ and $|\eta|<0.3$ with the ALICE apparatus at the LHC. These data are compared to results in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$ TeV at similar charged-particle multiplicities. In pp and p-Pb collisions, a strong increase of $\langle p_{\rm T}\rangle$ with $N_{\rm ch}$ is observed, which is much stronger than that measured in Pb-Pb colli…
Transverse momentum spectra and nuclear modification factors of charged particles in pp, p-Pb and Pb-Pb collisions at the LHC
2018
We report the measured transverse momentum ($p_{\rm T}$) spectra of primary charged particles from pp, p-Pb and Pb-Pb collisions at a center-of-mass energy $\sqrt{s_{\rm NN}} = 5.02$ TeV in the kinematic range of $0.15<p_{\rm T}<50$ GeV/$c$ and $|\eta|< 0.8$. A significant improvement of systematic uncertainties motivated the reanalysis of data in pp and Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV, as well as in p-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV, which is also presented. Spectra from Pb-Pb collisions are presented in nine centrality intervals and are compared to a reference spectrum from pp collisions scaled by the number of binary nucleon-nucleon collisions. For cent…
Il contributo delle donne allo sviluppo dell'architettura moderna
2015
Il video riguarda il ridisegno di architetture di Eileen Gray, Charlotte Perriand, Helena Syrkus, Barbara Sokolowska, Hana Kucerova, Margarette Schutte-Lihotsky, Gae Aulenti. Lina Bo Bardi, Lilly Reich, Lotte Cohn, Alison Smithson
La presència de dones pioneres europees en el camp psicològic
2019
espanolEn este trabajo se revisa la participacion de mujeres pioneras europeas en el campo psicologico, con el objetivo de analizar su aportacion al desarrollo de la disciplina, a lo largo del siglo xx y principios del xxi. Para ello, de las fuentes de la bibliografia que ofrece Benjamin, en 1980, se han seleccionado siete mujeres nacidas en Europa, en el siglo xix. Y a partir de una metodologia bibliometrica se ha examinado la informacion del Social Sciences Citation Index, –ssci–, desde 1900 hasta 2016. Los resultados indican que las pioneras mujeres europeas, psicoanalistas, psiquiatras y psicologas, han obtenido un alto numero de citas a lo largo del tiempo. Los temas en que sus obras a…
THE N* (1520) -> DELTA PI AMPLITUDES EXTRACTED FROM THE GAMMA P -> PI+ PI- P REACTION AND COMPARISON TO QUARK MODELS
1995
[EN] The ¿p ¿ ¿+¿¿p reaction, in combination with data from the ¿N ¿ ¿¿N reaction has been recently analyzed and allows one to obtain the s- and d-wave amplitudes for the decay into ¿¿ with absolute sign with respect to the helicity amplitudes. In addition one obtains the novel information on the momentum dependence of the amplitudes. In the present paper we show how this new information poses new constraints to quark models of hadron structure. In particular we show that the signs and the momentum dependence of these amplitudes coincide with those given by non relativistic constituent quark models. The absolute values provided by these models agree only qualitatively, and a discussion is d…
Centrality and rapidity dependence of inclusive pion and prompt photon production in p+Pb collisions at the LHC with EPS09s nPDFs
2014
The centrality dependencies of the inclusive neutral pion and prompt photon nuclear modification factors for p+Pb collisions at the LHC are studied using a spatially dependent set of nuclear PDFs, EPS09s. The calculations are performed at mid- and forward rapidities searching for an observable which would optimally probe the spatial dependence of the nuclear PDFs. In addition, we discuss to which $x$ values of the nucleus the different observables are sensitive.
Coherent neutrino scattering
2009
We present a microscopic model for coherent pion production off nuclei induced by neutrinos. This model is built upon a model for single nucleon processes that goes beyond the usual Delta dominance by including non resonant background contributions. We include nuclear medium effects: medium corrections to Delta$ properties and outgoing pion absortion via an optical potential. This results in major modifications to cross sections for low energy experiments when compared with phenomenological models like Rein-Sehgal's.