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C1b: B¯B mixing, CP violation, and lifetimes

Principal Investigators
Prof. Alexander Lenz Siegen University
Prof. Ulrich Nierste Karlsruhe Institute of Technology
Prof. Matthias Steinhauser Karlsruhe Institute of Technology

Subject

The main focus of project C1b are lifetimes and inclusive decays of B and D mesons. Based on the Heavy Quark Expansion a systematic expansion of the physical quantities are obtained as an expansion in the inverse heavy quark mass. Several matching coefficient are computed to higher order in perturbative QCD and their phenomenological implications are studied.

Project Topics

  1. Γq12 to NNLO for mc=0
    • will reduce perturbative uncertainty of leading-power contribution to ΔΓs from 10% to 3%
    • requires solution of new three-loop integral families
  2. Γq12 at order αs/mb
    • needed to reduce overall uncertainty in ΔΓq/ΔMq well below 10\%
  3. τ(B+)/τ(Bd) and τ(Ξ0b)/τ(Ξb) at orders α2s and αs/mb
    • tests the formalism (HQE and lattice calculations)
  4. Charm hadron lifetimes
    • tests the HQE at order 1/mQ
  5. τ(Bs)/τ(Bd) and τ(Λb)/τ(Ξ0b)
    • probes new physics in penguin coefficients
  6. Γq12 to NNLO at order m2c/m2b
    • NNLO accuracy for adfs, which probes new physics in e.g. bdˉqq decays
  7. Phenomenological studies
    • devise judicious combinations to reduce hadronic uncertainties
    • propose new observables
P3H-24-085
Title: Towards a SM prediction for CP violation in charm
Type: Paper
Authors: Alexander Lenz, Maria Laura Piscopo, Aleksey V. Rusov
arXiv: 2403.02267
Info: Contribution to the Proceedings of the 20th International Conference on B-Physics at Frontier Machines (Beauty 2023), 3-7 July 2023, Clermont-Ferrand, France
P3H-24-084
Title: Lifetimes of b-hadrons and mixing of neutral B-mesons: theoretical and experimental status
Type: Paper
Authors: Johannes Albrecht, Florian Bernlochner, Alexander Lenz, Aleksey Rusov
arXiv: 2402.04224
Info: Published in Eur.Phys.J.ST 233 (2024) 2, 359
P3H-24-037
Title: Update on technical aspects of B meson mixing at NNLO
Type: Proceedings
Authors: Pascal Reeck
arXiv: 2406.16084
Info:
P3H-24-032
Title: Determining Weak Mixing Angle at \muTRISTAN
Type: Paper
Authors: Lisong Chen, Syuhei Iguro, Yu Hamada
arXiv: 2406.04500
Info:
P3H-24-031
Title: B meson mixing at NNLO: technical aspects
Type: Paper
Authors: Pascal Reeck, Vladyslav Shtabovenko, Matthias Steinhauser
arXiv: 2405.14698
Info:
P3H-24-021
Title: Summary of Working Group 4: Mixing and mixing-related CP violation in the B system: Δm, ΔΓ, ϕs, ϕ1/α, ϕ2/β, ϕ3/γ
Type: Proceedings
Authors: Agnieszka Dziurda, Felix Erben, Marc Quentin Führing, Thibaud Humair, Thomas Latham, Eleftheria Malami, Pascal Reeck, Vladyslav Shtabovenko, Melissa Cruz Torres, Yuma Uematsu, K. Keri Vos
arXiv2404.03945
Info: 12th Workshop on the CKM Unitarity Triangle, Santiago de Compostela, 18-22 September 2023
P3H-24-017
Title: Summary of Working Group 4: Mixing and mixing-related CP violation in the B system: δm, ΔΓ, ϕs, ϕ1/α, ϕ2/β, ϕ3/γ
Type: Proceedings
Authors: Agnieszka Dziurda, Felix Erben, Marc Quentin Fuhring, Thibaud Humair, Thomas Latham, Pascal Reeck, Vladyslav Shtabovenko, K. Keri Vos
arXiv: https://arxiv.org/pdf/2404.03945
Info: CKM 2023, WG 4 Summary
P3H-24-016
Title: NNLO QCD corrections to ΔΓs in the Bs¯Bs system
Type: Proceedings
Authors: Marvin Gerlach, Ulrich Nierste, Pascal Reeck, Vladyslav Shtabovenko, Matthias Steinhauser
arXiv:https://arxiv.org/pdf/ 2403.08316
Info:
P3H-23-009
Title: Studies of New Physics in B0qˉB0q Mixing and Implications for Leptonic Decays
Type: Proceedings
Authors: Kristof De Bruyn, Robert Fleischer, Eleftheria Malami, Philine van Vliet
arXiv: 2301.13649
Info: Contribution to DISCRETE 2022
P3H-22-051
Title: The width difference in the BˉB system at next-to-next-to-leading order of QCD
Type: Paper
Authors: Marvin Gerlach, Ulrich Nierste, Vladyslav Shtabovenko, Matthias Steinhauser
arXiv: 2205.07907
Info: Published in Phys.Rev.Lett. 129 (2022) 10, 102001