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FLAG Review 2021

The latest version of the FLAG 21 review as of February 2023 is accessible here. It contains updated sections as follows:

Quark masses: updated Feburary 2023
$|V_{ud}|$ and $|V_{us}|$: updated Feburary 2023
$B$-meson decay constants, mixing parameters, and form factors: updated February 2023
Scale setting: updated Feburary 2023

The version of the FLAG review as of November 2021 is accessible here and corresponds to the one accepted for publication in EPJC. The EPJC version can be obtained from here.

The separate sections can be downloaded as separate pdf-files following the links in the table of contents below, or via the menu in the sidebar. Clicking on the FLAG logo in the upper left corner links back to this main page.

The latest figures can be downloaded in pdf and png format, together with a bib-file containing the bibtex-entries for the calculations which contribute to the FLAG averages and estimates. The downloads are available via the menu in the sidebar.

In the notes we compile detailed information on the simulations used to calculate the quantities discussed in the review. In the current report we present this information only for results that are new w.r.t. FLAG 19. For all other results the information is available in the corresponding Appendices of the previous reports.

The previous version of the FLAG review was updated as of December 2020 and is accessible at flag.unibe.ch/2019 where also the original 2019 edition of the FLAG review can be downloaded. The original complete 2015/2016 review is still accessible from EPJC. The 2016/2017 updates are available from here. The 2013/2014 review is accessible here or from EPJC.

Contents

Introduction
1. FLAG composition, guidelines and rules
2. Citation policy
Quality criteria
Quark masses
$\small{V_{ud}}$ and $\small{V_{us}}$
Low-energy constants
Kaon mixing
$\small{D}$-meson decay constants and form factors
$\small{B}$-meson decay constants, mixing parameters, and form factors
The strong coupling $\alpha_s$
Nucleon matrix elements
Scale setting
Appendix
Notes

Inquiries, suggestions can be sent to the FLAG Editorial Board <flag-eb AT itp DOT unibe DOT ch>.

Introduction

The introduction with the summary tables can be downloaded here.

We review lattice results related to pion, kaon, $D$-meson, $B$-meson, and nucleon physics with the aim of making them easily accessible to the nuclear and particle physics communities. More specifically, we report on the determination of the light-quark masses, the form factor $f_+(0)$ arising in the semileptonic $K \to \pi$ transition at zero momentum transfer, as well as the decay constant ratio $f_K/f_\pi$ and its consequences for the CKM matrix elements $V_{us}$ and $V_{ud}$. Furthermore, we describe the results obtained on the lattice for some of the low-energy constants of $SU(2)_L\times SU(2)_R$ and $SU(3)_L\times SU(3)_R$ Chiral Perturbation Theory. We review the determination of the $B_K$ parameter of neutral kaon mixing as well as the additional four $B$ parameters that arise in theories of physics beyond the Standard Model. For the heavy-quark sector, we provide results for $m_c$ and $m_b$ as well as those for the decay constants, form factors, and mixing parameters of charmed and bottom mesons and baryons. These are the heavy-quark quantities most relevant for the determination of CKM matrix elements and the global CKM unitarity-triangle fit. We review the status of lattice determinations of the strong coupling constant $\alpha_s$. We consider nucleon matrix elements, and review the determinations of the axial, scalar and tensor bilinears, both isovector and flavor diagonal. Finally, in this review we have added a new section reviewing determinations of scale-setting quantities.

FLAG composition, guidelines and rules

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FLAG strives to be representative of the lattice community, both in terms of the geographical location of its members and the lattice collaborations to which they belong. We aspire to provide the nuclear- and particle-physics communities with a single source of reliable information on lattice results.

In order to work reliably and efficiently, we have adopted a formal structure and a set of rules by which all FLAG members abide. The collaboration presently consists of an Advisory Board (AB), an Editorial Board (EB), and eight Working Groups (WG). The role of the Advisory Board is to provide oversight of the content, procedures, schedule and membership of FLAG, to help resolve disputes, to serve as a source of advice to the EB and to FLAG as a whole, and to provide a critical assessment of drafts. They also give their approval of the final version of the preprint before it is rendered public. The Editorial Board coordinates the activities of FLAG, sets priorities and intermediate deadlines, organizes votes on FLAG procedures, writes the introductory sections, and takes care of the editorial work needed to amalgamate the sections written by the individual working groups into a uniform and coherent review. The working groups concentrate on writing the review of the physical quantities for which they are responsible, which is subsequently circulated to the whole collaboration for critical evaluation.

The current list of FLAG members and their Working Group assignments is:

Advisory Board (AB)		G. Colangelo, M. Golterman, P. Hernandez, T. Onogi, R. Van de Water
Editorial Board (EB)		S. Gottlieb, A. Jüttner, S. Hashimoto, S. Sharpe, U. Wenger
Working Groups (coordinator listed first)
Quark masses		T. Blum, A. Portelli, A. Ramos
$V_{us}, V_{ud}$		T. Kaneko, J.N. Simone, S. Simula, N. Tantalo
LEC		S. Dürr, H. Fukaya, U.M. Heller
$B_K$		P. Dimopoulos, X. Feng, G. Herdoiza
$f_{B_{(s)}}$, $f_{D_{(s)}}$, $B_B$		Y. Aoki, M. Della Morte, C. Monahan
$B_{(s)}$, $D$ semileptonic and radiative decays		E. Lunghi, S. Meinel, C. Pena
$\alpha_s$		S. Sint, R. Horsley, P. Petreczky
Nucleon Matrix Elements		R. Gupta, S. Collins, A. Nicholson, H. Wittig
Scale setting		R. Sommer, N. Tantalo, U. Wenger

The most important FLAG guidelines and rules are the following:

the composition of the AB reflects the main geographical areas in which lattice collaborations are active, with members from America, Asia/Oceania, and Europe;
the mandate of regular members is not limited in time, but we expect that a certain turnover will occur naturally;
whenever a replacement becomes necessary this has to keep, and possibly improve, the balance in FLAG, so that different collaborations, from different geographical areas are represented;
in all working groups the members must belong to different lattice collaborations;
a paper is in general not reviewed (nor colour-coded, as described in the next section) by any of its authors;
lattice collaborations will be consulted on the colour coding of their calculation;
there are also internal rules regulating our work, such as voting procedures.

As for FLAG 19, for this review we sought the advice of external reviewers once a complete draft of the review was available. For each review section, we have asked one lattice expert (who could be a FLAG alumnus/alumna) and one nonlattice phenomenologist for a critical assessment. This is similar to the procedure followed by the Particle Data Group in the creation of the Review of Particle Physics. The reviewers provide comments and feedback on scientific and stylistic matters. They are not anonymous, and enter into a discussion with the authors of the WG. Our aim with this additional step is to make sure that a wider array of viewpoints enter into the discussions, so as to make this review more useful for its intended audience.

Citation policy

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Quality criteria

The section on the quality criteria can be downloaded here.

Quark masses

The section on the quark masses can be downloaded here.

$\small{V_{ud}}$ and $\small{V_{us}}$

The section on $V_{ud}$ and $V_{us}$ can be downloaded here.

Low-energy constants

The section on the low-energy constants can be downloaded here.

Kaon mixing

The section on the kaon mixing can be downloaded here.

$\small{D}$-meson decay constants and form factors

The section on the $D$-meson decay constants and form factors can be downloaded here.

$\small{B}$-meson decay constants, mixing parameters, and form factors

The section on the $B$-meson decay constants, mixing parameters, and form factors can be downloaded here.

The strong coupling $\alpha_s$

The section on the strong coupling $\alpha_s$ can be downloaded here.

Nucleon matrix elements

The section on nucleon matrix elements can be downloaded here.

Scale setting

The section on scale setting can be downloaded here.

Appendix

The Appendix can be downloaded here.

Notes

Notes to the various sections can be downloaded here in reduced form (containing notes to results that are new w.r.t. FLAG 19).

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