Chiral transition of fundamental and adjoint quarks

The chiral symmetry breaking transition of quarks in the fundamental and adjoint representation is studied in a model where the gap equation contains two contributions, one containing a confining propagator and another corresponding to the exchange of one-dressed dynamically massive gluons. When quarks are in the fundamental representation the confinement effect dominates the chiral symmetry breaking while the gluon exchange is suppressed due to the dynamical gluon mass effect in the propagator and coupling constant. In this case the chiral and deconfinement transition temperatures are approximately the same. For quarks in the adjoint representation, due to the larger Casimir eigenvalue, the gluon exchange is operative and the chiral transition happens at a larger temperature than the deconfinement one.Comment: 12 pages, 1 figure, improved discussio

QCD chiral symmetry restoration with a large number of quarks in a model with a confining propagator and dynamically massive gluons

Considering a QCD chiral symmetry breaking model where the gap equation contains an effective confining propagator and a dressed gluon propagator with a dynamically generated mass, we verify that the chiral symmetry is restored for a large number of quarks $n_{f}\approx 7-13$. We discuss the uncertainty in the results, that is related to the determination of the string tension ($K_{F}$), appearing in the confining propagator, and the effective gluon mass ($m_{g}$) at large $n_{f}$.Comment: 5 pages, 6 figure

Los agentes de intermediación

Ponencias de las Terceras Jornadas sobre Empleo y Discapacidad celebradas el 29 de abril de 2009 en la Universidad Carlos III de MadridNo publicad

Proyecto interdisciplinar para alunos de 6º de Primaria

En este trabajo viene reflejado una programación didáctica de varios meses, de carácter interdisciplinar, uniendo las asignaturas de matemáticas, lengua, conocimiento del medio natural y cultural, educación física, música, plástica e inglés. A través de una serie de actividades dedicadas a conocer España, los alumnos conocen los contenidos de las áreas ya mencionadas, de una manera práctica y activa. Este proyecto se sustenta en una metodología cooperativa, colaborativa e inclusiva. A demás de esto el proyecto viene contextualizado en un marco teórico, que explica las metodologías y estrategias del mismo.Grado en Educación Primari

QCD chiral symmetry restoration with a large number of quarks in a model with a confining propagator and dynamically massive gluons

AbstractConsidering a QCD chiral symmetry breaking model where the gap equation contains an effective confining propagator and a dressed gluon propagator with a dynamically generated mass, we verify that the chiral symmetry is restored for a large number of quarks nf≈7−13. We discuss the uncertainty in the results, that is related to the determination of the string tension (KF), appearing in the confining propagator, and the effective gluon mass (mg) at large nf

Hunting wino and higgsino dark matter at the muon collider with disappearing tracks

We study the capabilities of a muon collider experiment to detect disappearing tracks originating when a heavy and electrically charged long-lived particle decays via $X^+ \to Y^+ Z^0$, where $X^+$ and $Z^0$ are two almost mass degenerate new states and $Y^+$ is a charged Standard Model particle. The backgrounds induced by the in-flight decays of the muon beams (BIB) can create detector hit combinations that mimic long-lived particle signatures, making the search a daunting task. We design a simple strategy to tame the BIB, based on a detector-hit-level selection exploiting timing information and hit-to-hit correlations, followed by simple requirements on the quality of reconstructed tracks. Our strategy allows us to reduce the number of tracks from BIB to an average of 0.08 per event, hence being able to design a cut-and-count analysis that shows that it is possible to cover weak doublets and triplets with masses close to $\sqrt{s}/2$ in the 0.1-10 ns range. In particular, this implies that a 10 TeV muon collider is able to probe thermal MSSM higgsinos and thermal MSSM winos, thus rivaling the FCC-hh in that respect, and further enlarging the physics program of the muon collider into the territory of WIMP dark matter and long-lived signatures. We also provide parton-to-reconstructed level efficiency maps, allowing an estimation of the coverage of disappearing tracks at muon colliders for arbitrary models.Comment: 32 pages, 17 figures, 3 table