Description du projet
Faire table rase du passé et disposer d’un énorme ensemble de données pourrait aider à déterminer la masse du boson W
Selon le modèle standard de la physique des particules, l’Univers entier est constitué de 17 particules fondamentales. Celles-ci comprennent les éléments constitutifs de la matière, six quarks et six leptons, et cinq particules porteuses de force, dont le boson W. Le boson W a été découvert il y a environ quarante ans et les scientifiques tentent toujours de déterminer sa masse avec précision. Il existe une divergence entre sa valeur attendue, basée sur le modèle standard, et sa valeur déterminée expérimentalement. Le projet ASYMOW, financé par l’UE, tentera d’adopter une nouvelle approche, en faisant abstraction des connaissances préalables et en s’appuyant sur la grande quantité de données disponibles issues des expériences les plus avancées.
Objectif
Despite its success in describing the sub-nuclear realm, the Standard Model of particle and field interactions cannot account for a number of experimental facts that constitute evidence of new and unknown physics. Sitting at both the energy and intensity frontier, the LHC grants the highest chances for solving the current puzzle. By exploiting the data collected by the CMS experiment at the LHC, ASYMOW aims at attaining an unprecedented experimental accuracy on a fundamental parameter of Nature: the mass of the W boson. As of today, there is a tension between the Standard Model expectation and the measured value of the W boson mass. A new measurement with a 10 MeV uncertainty, i.e. twice as small as the single best measurement, is a breakthrough: it could either rule out the tension or build a convincing case that this anomaly is real, thus implying the existence of new physics. The collider physics community has been pursuing this goal for decades. The quest now seems to have hit the wall of systematic uncertainty. This project proposes a new approach towards the W boson mass measurement, which will circumvent the systematic uncertainties that are currently limiting the precision. The novelty of the proposed method lies in its agnosticism with respect to the microscopic picture of W boson production in hadron collisions. The loss of prior knowledge inherent to this new approach will be asymptotically compensated by the large amount of data available for the measurement, as will be collected at the LHC. ASYMOW will be conducted by a small group of scientists and comes with great experimental and theoretical challenges. The main expected result is the measurement of the W boson mass with a precision better than the state-of-the-art. This may open new scenarios in particle physics.
Champ scientifique
Programme(s)
Régime de financement
ERC-COG - Consolidator GrantInstitution d’accueil
56126 Pisa
Italie