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Power to the LHC data: an ASYmptotically MOdel-independent measurement of the W boson mass

Descripción del proyecto

Una tabula rasa y un gran conjunto de datos podrían ayudar a determinar la masa del bosón W

Según el modelo estándar de la física de partículas, todo el Universo consta de diecisiete partículas elementales, que incluyen los componentes básicos de la materia: seis quarks y seis leptones, así como cinco partículas portadoras de fuerza, incluido el bosón W. El bosón W se descubrió hace unos cuarenta años y los científicos todavía tratan hoy día de determinar su masa con precisión. Existe una discrepancia entre su valor esperado según el modelo estándar y el determinado de forma experimental. En el proyecto ASYMOW, financiado con fondos europeos, se probará un método novedoso, que ignorará los conocimientos previos para centrarse en la gran cantidad de datos disponibles de los experimentos más avanzados.

Objetivo

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.

Régimen de financiación

ERC-COG - Consolidator Grant

Institución de acogida

UNIVERSITA DI PISA
Aportación neta de la UEn
€ 936 250,00
Dirección
LUNGARNO PACINOTTI 43/44
56126 Pisa
Italia

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Región
Centro (IT) Toscana Pisa
Tipo de actividad
Higher or Secondary Education Establishments
Enlaces
Coste total
€ 936 250,00

Beneficiarios (3)