0000000000589235
AUTHOR
Pablo Gomis López
Development of the Pixel Detector for the Belle II experiment and top quark mass measurement in radiative events at the future electron-positron linear collider
Durante los últimos cien años, los numerosos descubrimientos en los colisionadores de partículas y desarrollos teóricos han conducido a los físicos de partículas a construir el Modelo Estándar, el modelo teórico más exitoso hasta la fecha. Sin embargo, a pesar de su gran éxito, el Modelo Estándar no describe toda la fenomenología observada actualmente en los diferentes experimentos. Es por ello que se necesitan nuevos colisionadores que proporcionen observaciones de nueva física que nos ayuden a construir modelos que describan dicha fenomenología. Para enfrentarse al reto, la comunidad de física de partículas se une formando grandes colaboraciones, con el propósito de diseñar y construir lo…
Alignment for the first precision measurements at Belle II
On March 25th 2019, the Belle II detector recorded the first collisions delivered by the SuperKEKB accelerator. This marked the beginning of the physics run with vertex detector. The vertex detector was aligned initially with cosmic ray tracks without magnetic field simultaneously with the drift chamber. The alignment method is based on Millepede II and the General Broken Lines track model and includes also the muon system or primary vertex position alignment. To control weak modes, we employ sensitive validation tools and various track samples can be used as alignment input, from straight cosmic tracks to mass-constrained decays. With increasing luminosity and experience, the alignment is …
Data quality monitors of vertex detectors at the start of the Belle II experiment
The Belle II experiment features a substantial upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric e+e− collider at KEK in Tsukuba, Japan. The accelerator completed its first phase of commissioning in 2016, and the Belle II detector saw its first electron-positron collisions in April 2018. Belle II features a newly designed silicon vertex detector based on double-sided strip layers and DEPFET pixel layers. A subset of the vertex detector was operated in 2018 to determine background conditions (Phase 2 operation). The collaboration completed full detector installation in January 2019, and the experiment started full data taking. This paper will report on the fin…