Jacky Kumar
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View article: A package for renormalization group running in the SMEFT with sterile neutrinos
A package for renormalization group running in the SMEFT with sterile neutrinos Open
Sterile neutrinos are well-motivated beyond the Standard Model (BSM) particles. The Standard Model Effective Field Theory (SMEFT) augmented with these new fields is known as the $$\nu $$ SMEFT. We present the first code for solving the r…
View article: Model dependence in SMEFT
Model dependence in SMEFT Open
We point out that, although SMEFT is constructed to be model-independent, this holds only if complete sets of operators are used. SMEFT analyses that focus on subsets of operators are only semi-model-independent. They probe classes of ultr…
View article: Uniting low-energy semileptonic and hadronic anomalies within SMEFT
Uniting low-energy semileptonic and hadronic anomalies within SMEFT Open
A bstract Two categories of four-fermion SMEFT operators are semileptonic (two quarks and two leptons) and hadronic (four quarks). At tree level, an operator of a given category contributes only to processes of the same category. However, …
View article: wilson: A package for renormalization group running in the SMEFT with Sterile Neutrinos
wilson: A package for renormalization group running in the SMEFT with Sterile Neutrinos Open
Sterile neutrinos are well-motivated beyond the Standard Model (BSM) particles. The Standard Model Effective Field Theory (SMEFT) augmented with these new fields is known as the $ν$SMEFT. We present the first code for solving the renormali…
View article: Electric dipole moments in 5+3 flavor weak effective theory
Electric dipole moments in 5+3 flavor weak effective theory Open
A bstract A fully generic treatment of electric dipole moments (EDMs) is presented in the CP-violating and flavor-conserving weak effective field theory (WET) with five flavors of quarks and three flavors of leptons. We systematically anal…
View article: Uniting Low-energy Semileptonic and Hadronic Anomalies within SMEFT
Uniting Low-energy Semileptonic and Hadronic Anomalies within SMEFT Open
Two categories of four-fermion SMEFT operators are semileptonic (two quarks and two leptons) and hadronic (four quarks). At tree level, an operator of a given category contributes only to processes of the same category. However, when the S…
View article: Sterile neutrino dark matter within the $ν$SMEFT
Sterile neutrino dark matter within the $ν$SMEFT Open
Sterile neutrinos with masses at the $\mathrm{keV}$ scale and mixing to the active neutrinos offer an elegant explanation of the observed dark matter (DM) density. However, the very same mixing inevitably leads to radiative photon emission…
View article: Leptonic operators for the Cabbibo angle anomaly with SMEFT RG evolution
Leptonic operators for the Cabbibo angle anomaly with SMEFT RG evolution Open
International audience
View article: Anomalous dimensions from Yukawa couplings in SMNEFT: four-fermion operators
Anomalous dimensions from Yukawa couplings in SMNEFT: four-fermion operators Open
The Standard Model Neutrino Effective Field Theory (SMNEFT) is the Standard Model Effective Field Theory (SMEFT) augmented with right-handed neutrinos. Building on our previous work, arXiv:2010.12109, we calculate the Yukawa coupling contr…
View article: Simple rules for evanescent operators in one-loop basis transformations
Simple rules for evanescent operators in one-loop basis transformations Open
Basis transformations often involve Fierz and other relations that are only valid in $D=4$ dimensions. In general $D$ spacetime dimensions, however, evanescent operators have to be introduced in order to preserve such identities. Such evan…
View article: Dimension-8 SMEFT matching conditions for the low-energy effective field theory
Dimension-8 SMEFT matching conditions for the low-energy effective field theory Open
A bstract In particle physics, the modern view is to categorize things in terms of effective field theories (EFTs). Above the weak scale, we have the SMEFT, formed when the heavy new physics (NP) is integrated out, and for which the Standa…
View article: Kaon Physics Without New Physics in $\varepsilon_K$
Kaon Physics Without New Physics in $\varepsilon_K$ Open
Despite the observation of significant suppression of $b\to sμ^+μ^-$ branching ratios no clear sign of New Physics (NP) has been identified in $ΔF=2$ observables, in particular to $\varepsilon_K$. Assuming negligible NP contributions to th…
View article: Simple Rules for Evanescent Operators in One-Loop Basis Transformations
Simple Rules for Evanescent Operators in One-Loop Basis Transformations Open
The basis transformations of the effective operators often involve Fierz and other relations which are only valid in $D=4$ space-time dimensions. In general, in $D$ space-time dimensions, however, the evanescent operators have to be introd…
View article: Dimension-8 SMEFT Matching Conditions for the Low-Energy Effective Field Theory
Dimension-8 SMEFT Matching Conditions for the Low-Energy Effective Field Theory Open
In particle physics, the modern view is to categorize things in terms of effective field theories (EFTs). Above the weak scale, we have the SMEFT, formed when the heavy new physics (NP) is integrated out, and for which the Standard Model (…
View article: The $B$ Anomalies, the $U_1$ Leptoquark and Dark Matter
The $B$ Anomalies, the $U_1$ Leptoquark and Dark Matter Open
The present-day $B$-anomalies involving $b \\to s \\mu^+ \\mu^-$ or $b \\to c\n\\tau^- {\\bar\\nu}$ transitions can all be explained with the addition of a\nvector $U_1$ leptoquark with a mass of $M_{U_1} \\ge 1.8$ TeV. In the scalar\nsing…
View article: NLO QCD Renormalization Group Evolution for Non-Leptonic $ΔF=2$ Transitions in the SMEFT
NLO QCD Renormalization Group Evolution for Non-Leptonic $ΔF=2$ Transitions in the SMEFT Open
We present for the first time NLO QCD Renormalization Group (RG) evolution matrices for non-leptonic $ΔF=2$ transitions in the Standard Model Effective Field Theory (SMEFT). To this end we transform first the known two-loop QCD anomalous d…
View article: On the Importance of Rare Kaon Decays: A Snowmass 2021 White Paper
On the Importance of Rare Kaon Decays: A Snowmass 2021 White Paper Open
We stress the importance of precise measurements of rare decays $K^+\rightarrowπ^+ν\barν$, $K_L\rightarrowπ^0ν\barν$, $K_{L,S}\toμ^+μ^-$ and $K_{L,S}\toπ^0\ell^+\ell^-$ for the search of new physics (NP). This includes both branching ratio…
View article: Simple Rules for Evanescent Operators in One-Loop Basis Transformations
Simple Rules for Evanescent Operators in One-Loop Basis Transformations Open
Basis transformations often involve Fierz and other relations which are only valid in $D=4$ dimensions. In general $D$ space-time dimensions however, evanescent operators have to be introduced, in order to preserve such identities. Such ev…
View article: BSM master formula for ε′/ε in the WET basis at NLO in QCD
BSM master formula for ε′/ε in the WET basis at NLO in QCD Open
A bstract As an important step towards a complete next-to-leading (NLO) QCD analysis of the ratio ε′ / ε within the Standard Model Effective Field Theory (SMEFT), we present for the first time the NLO master formula for the BSM part of thi…
View article: Beyond SMEFT with $b \to c \,τ^- {\barν}$
Beyond SMEFT with $b \to c \,τ^- {\barν}$ Open
Electroweak interactions assign a central role to the gauge group $SU(2)_L \times U(1)_Y$, which is either realized linearly (SMEFT) or nonlinearly (e.g., HEFT) in the effective theory obtained when new physics above the electroweak scale …
View article: flav-io/flavio: v2.3.1
flav-io/flavio: v2.3.1 Open
This minor release adds the recent LHCb measurements of the Bs→φμμ angular observables FL, S3, S4, and S7 from arXiv:2107.13428.
View article: Leptonic Operators for Cabbibo Angle Anomaly with SMEFT RG Evolution
Leptonic Operators for Cabbibo Angle Anomaly with SMEFT RG Evolution Open
The measurements of the Cabibbo--Kobayashi--Maskawa (CKM) elements can be contaminated by new-physics effects. We point out that purely leptonic operators at the high scale can influence semileptonic $K$ decays and nuclear beta decay throu…