Current and future constraints on heavy New Physics from $\tau$ weak dipole moments

Košnik, Nejc (avtor), Polonsky, Zachary (avtor), Smolkovič, Aleks (avtor)

We study the weak magnetic and electric dipole moments of the $\tau$ lepton as precision tests of the Standard Model (SM) and probes of heavy New Physics (NP). We present an updated SM prediction for the $\tau$ weak magnetic dipole moment at one loop, including a careful assessment of theoretical uncertainties from electroweak scheme dependence. Working within the SM Effective Field Theory, we derive comprehensive current constraints on the $\tau$ dipole operators from a combination of observables: the $\tau$ weak and electromagnetic dipole moments, high-mass Drell-Yan tails at the LHC, Z partial decay widths, and the electron electric dipole moment. Finally, we assess the prospects of measuring the SM value of the $\tau$ weak magnetic moment at the FCC-ee Tera-Z run, and project the sensitivities of the leading observables to heavy NP at FCC-ee and HL-LHC, incorporating informed assumptions about improvements of systematic uncertainties. We find that the $\tau$ weak dipole moments are already among the leading probes of the $\tau$ dipole operators, and will become increasingly dominant at future colliders.

• Jezik: Angleški jezik
• Ključne besede: electroweak precision physics, higher order electroweak calculations, electric dipole moments, Standard Model Effective Field Theory
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2026
• Št. strani: 31 str.
• Številčenje: Vol. 2026, art. no. 129
• PID: 20.500.12556/RUL-187933
• UDK: 539.120
• ISSN pri članku: 1029-8479
• DOI: 10.1007/JHEP09(2026)129
• COBISS.SI-ID: 291277315
• Datum objave v RUL: 16.09.2026

Gradivo je del revije

• Naslov: The journal of high energy physics
• Skrajšan naslov: J. high energy phys.
• Založnik: SISSA
• ISSN: 1029-8479
• COBISS.SI-ID: 1314148

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: fizika visokih energij, Standardni model, Nova fizika