The strong coupling constant: state of the art and the decade ahead

Theoretical predictions for particle production cross sections and decays at colliders rely heavily on perturbative Quantum Chromodynamics (QCD) calculations, expressed as an expansion in powers of the strong coupling constant α S . The current O ( 1 % ) uncertainty of the QCD coupling evaluated at...

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Detalles Bibliográficos
Autores: d’Enterria, D., Kluth, S., Zanderighi, G., Ayala, C., Benitez-Rathgeb, M.A., Blümlein, J., Boito, D., Brambilla, N., Britzger, D., Camarda, S., Cooper-Sarkar, A.M., Cridge, T., Cvetič, G., Dalla Brida, M., Deur, A., Giuli, F., Golterman, M., Hoang, A.H., Huston, J., Jamin, M., Kotikov, A.V., Krivokhizhin, V.G., Kronfeld, A.S., Leino, V., Lipka, K., Mäkelä, T., Malaescu, B., Maltman, K., Marzani, S., Mateu, V., Moch, S., Monni, P.F., Nadolsky, P., Nason, P., Nesterenko, A.V., Pérez-Ramos, R., Peris, S., Petreczky, P., Pich, Antonio, Rabbertz, K., Ramos, A., Reichelt, D., Rodriguez-Sánchez, A., Rojo, J., Saragnese, M., Sawyer, L., Schott, M., Schumann, S., Shaikhatdenov, B.G., Sint, S., Soyez, G., Teca, D., Vairo, A., Vos, M., Waits, C., Weber, J.H., Wobisch, M., Xie, K.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/383145
Acceso en línea:http://hdl.handle.net/10261/383145
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85208751586&doi=10.1088%2f1361-6471%2fad1a78&partnerID=40&md5=dffaba34aaad259c06a4b193452ab643
Access Level:acceso abierto
Palabra clave:Colliders
QCD
Strong coupling
Descripción
Sumario:Theoretical predictions for particle production cross sections and decays at colliders rely heavily on perturbative Quantum Chromodynamics (QCD) calculations, expressed as an expansion in powers of the strong coupling constant α S . The current O ( 1 % ) uncertainty of the QCD coupling evaluated at the reference Z boson mass, α S ( m Z 2 ) = 0.1179 ± 0.0009 , is one of the limiting factors to more precisely describe multiple processes at current and future colliders. A reduction of this uncertainty is thus a prerequisite to perform precision tests of the Standard Model as well as searches for new physics. This report provides a comprehensive summary of the state-of-the-art, challenges, and prospects in the experimental and theoretical study of the strong coupling. The current α S ( m Z 2 ) world average is derived from a combination of seven categories of observables: (i) lattice QCD, (ii) hadronic τ decays, (iii) deep-inelastic scattering and parton distribution functions fits, (iv) electroweak boson decays, hadronic final-states in (v) e+e−, (vi) e-p, and (vii) p-p collisions, and (viii) quarkonia decays and masses. We review the current status of each of these seven α S ( m Z 2 ) extraction methods, discuss novel α S determinations, and examine the averaging method used to obtain the world-average value. Each of the methods discussed provides a ‘wish list’ of experimental and theoretical developments required in order to achieve the goal of a per-mille precision on α S ( m Z 2 ) within the next decade. © 2024 The Author(s). Published by IOP Publishing Ltd.

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