S. Schacht

activity

20122023

most citedThe Belle II Physics Book

570 citations · 2.1k across the 32 of their papers we have counts for

collaborators

32 papers

hep-ph2023★ 1 cited

Kaon Decays beyond the Standard Model

Stefan Schacht

We review a new method in order to determine the parameter $η ˉ$ of the Cabibbo-Kobayashi-Maskawa matrix from $K \to μ^{+} μ^{-}$ decays, using interference effects in the time…

hep-ph2022★ 10 cited

A Precision Relation between $Γ (K \to μ^{+} μ^{-}) (t)$ and $B (K_{L} \to μ^{+} μ^{-}) / B (K_{L} \to γ γ)$

Avital Dery, Mitrajyoti Ghosh, Yuval Grossman +2

We find that the phase appearing in the unitarity relation between $B (K_{L} \to μ^{+} μ^{-})$ and $B (K_{L} \to γ γ)$ is equal to the phase shift in the inte…

hep-ph2022

CP violation in $b$ and $c$ quark decays

Avital Dery, Yuval Grossman, Stefan Schacht +1

Generically, non-Standard-Model particles contribute to processes with order-one charge-parity (CP) violating phases, as CP is not a fundamental symmetry of nature. The exploration…

hep-ph2022★ 27 cited

A $U$ -Spin Anomaly in Charm CP Violation

Stefan Schacht

Recent LHCb data shows that the direct CP asymmetries of the decay modes $D^{0} \to π^{+} π^{-}$ and $D^{0} \to K^{+} K^{-}$ have the same sign, violating an improved $U$ -spin limi…

hep-ph2022★ 16 cited

The Mathematical Structure of $U$ -Spin Amplitude Sum Rules

Margarita Gavrilova, Yuval Grossman, Stefan Schacht

We perform a systematic study of $S U (2)$ flavor amplitude sum rules with particular emphasis on $U$ -spin. This study reveals a rich mathematical structure underlying the sum rules…

hep-ph2022★ 1 cited

New Physics Searches at Kaon and Hyperon Factories

Evgueni Goudzovski, Diego Redigolo, Kohsaku Tobioka +61

Rare meson decays are among the most sensitive probes of both heavy and light new physics. Among them, new physics searches using kaons benefit from their small total decay widths…

hep-ph2021★ 35 cited

Enhancement of charm CP violation due to nearby resonances

Stefan Schacht, Amarjit Soni

Quantitative understanding of CP violation is extremely important as naturalness reasoning strongly suggests that new physics should be accompanied by beyond the Standard Model CP-…

hep-ph2021★ 24 cited

$K \to μ^{+} μ^{-}$ as a clean probe of short-distance physics

Avital Dery, Mitrajyoti Ghosh, Yuval Grossman +1

The $K \to μ^{+} μ^{-}$ decay is often considered to be uninformative of fundamental theory parameters since the decay is polluted by long-distance hadronic effects. We demonstrate that,…

hep-ph2021

Probing the $Δ U = 0$ Rule in Three Body Charm Decays

Avital Dery, Yuval Grossman, Stefan Schacht +1

CP violation in charm decay was observed in the decays $D^{0} \to P^{\pm} P^{\mp}$ of a $D^{0}$ meson to two pseudoscalars. When interpreted within the SM, the results imply that…

hep-ph2020★ 4 cited

Relations between $b \to c τ ν$ Decay Modes in Scalar Models

Stefan Schacht, Amarjit Soni

As a consequence of the Ward identity for hadronic matrix elements, we find relations between the differential decay rates of semileptonic decay modes with the underlying quark-lev…

hep-ph2020★ 71 cited

Challenges in Semileptonic B Decays

P. Gambino, A. S. Kronfeld, M. Rotondo +22

Two of the elements of the Cabibbo-Kobayashi-Maskawa quark mixing matrix, $∣ V_{u b} ∣$ and $∣ V_{c b} ∣$ , are extracted from semileptonic B decays. The results of the B factories, analy…

hep-ph2020★ 22 cited

SU(3) $_{F}$ Analysis for Beauty Baryon Decays

Avital Dery, Mitrajyoti Ghosh, Yuval Grossman +1

We perform a general SU(3) $_{F}$ analysis of $b \to c c ˉ s (d)$ decays of members of the beauty baryon antitriplet to a member of the light baryon octet and a singlet. Under…

hep-ph2019★ 65 cited

On the Statistical Treatment of the Cabibbo Angle Anomaly

Yuval Grossman, Emilie Passemar, Stefan Schacht

We point out that testing the equality of the Cabibbo angle as extracted from $Γ (K \to π l ν)$ , the ratio $Γ (K \to l ν) /Γ (π \to l ν)$ and nuclear $β$ decays is not…

hep-ph2019★ 156 cited

The $V_{c b}$ puzzle: an update

Paolo Gambino, Martin Jung, Stefan Schacht

We discuss the impact of the recent untagged analysis of $B^{0} \to D^{*} l ν ˉ_{l}$ decays by the Belle Collaboration on the extraction of the CKM element $∣ V_{c b} ∣$ and prov…

hep-ph2019★ 81 cited

The Emergence of the $Δ U = 0$ Rule in Charm Physics

Yuval Grossman, Stefan Schacht

We discuss the implications of the recent discovery of CP violation in two-body SCS $D$ decays by LHCb. We show that the result can be explained within the SM without the need for…

hep-ph2018★ 38 cited

U-Spin Sum Rules for CP Asymmetries of Three-Body Charmed Baryon Decays

Yuval Grossman, Stefan Schacht

Triggered by a recent LHCb measurement and prospects for Belle II, we derive U-spin symmetry relations between integrated CP asymmetries of three-body $Λ_{c}^{+}$ and $Ξ_{c}^{+}$ decays. T…

hep-ph2018★ 15 cited

Confronting SUSY SO(10) with updated Lattice and Neutrino Data

Thomas Deppisch, Stefan Schacht, Martin Spinrath

We present an updated fit of supersymmetric SO(10) models to quark and lepton masses and mixing parameters. Including latest results from lattice QCD determinations of quark masses…

hep-ex2018★ 570 cited

The Belle II Physics Book

E. Kou, P. Urquijo, W. Altmannshofer +524

We present the physics program of the Belle II experiment, located on the intensity frontier SuperKEKB $e^{+} e^{-}$ collider. Belle II collected its first collisions in 2018, and is ex…

hep-ph2017

The role of theory input for exclusive $V_{c b}$ determinations

Stefan Schacht

Available form factor parametrizations for $B \to D^{*} l ν$ imply different theoretical assumptions and different treatments of theoretical uncertainties. They give results for…

hep-ph2017★ 29 cited

Neutral $D \to K K^{*}$ decays as discovery channels for charm CP violation

Ulrich Nierste, Stefan Schacht

We point out that the CP asymmetries in the decays $D^{0} \to K_{S} K^{* 0}$ and $D^{0} \to K_{S} K^{* 0}$ are potential discovery channels for charm CP violat…

hep-ph2017★ 233 cited

$R (D^{*})$ , $∣ V_{c b} ∣$ , and the Heavy Quark Symmetry relations between form factors

Dante Bigi, Paolo Gambino, Stefan Schacht

Stringent relations between the $B^{(*)} \to D^{(*)}$ form factors exist in the heavy quark limit and the leading symmetry breaking corrections are known. We reconsider their unce…

hep-ph2017★ 174 cited

A fresh look at the determination of |V_cb| from B-> D^* l nu

Dante Bigi, Paolo Gambino, Stefan Schacht

We use recent Belle results on $B ˉ^{0} \to D^{*+} l^{-} ν ˉ_{l}$ decays to extract the CKM element $∣ V_{c b} ∣$ with two different but well-founded parameterizations of the for…

hep-ph2017

CP asymmetries in $D \to P P^{'}$ decays

Ulrich Nierste, Stefan Schacht

This talk addresses two topics related to CP asymmetries in $D$ meson decays to two pseudoscalar mesons. First I discuss how new physics can be distinguished from the Standard Mode…

hep-ph2015★ 54 cited

CP Violation in $D^{0} \to K_{S} K_{S}$

Ulrich Nierste, Stefan Schacht

The direct CP asymmetry $a_{C P}^{dir} (D^{0} \to K_{S} K_{S})$ involves exchange diagrams which are induced at tree level in the Standard Model. Since the corresponding top…

Kaon Decays beyond the Standard Model

A Precision Relation between Γ(K→μ+μ−)(t) and B(KL​→μ+μ−)/B(KL​→γγ)

CP violation in b and c quark decays

A U-Spin Anomaly in Charm CP Violation

The Mathematical Structure of U-Spin Amplitude Sum Rules

New Physics Searches at Kaon and Hyperon Factories

Enhancement of charm CP violation due to nearby resonances

K→μ+μ− as a clean probe of short-distance physics

Probing the ΔU=0 Rule in Three Body Charm Decays

Relations between b→cτν Decay Modes in Scalar Models

Challenges in Semileptonic B Decays

SU(3)F​ Analysis for Beauty Baryon Decays

On the Statistical Treatment of the Cabibbo Angle Anomaly

The Vcb​ puzzle: an update

The Emergence of the ΔU=0 Rule in Charm Physics

U-Spin Sum Rules for CP Asymmetries of Three-Body Charmed Baryon Decays

Confronting SUSY SO(10) with updated Lattice and Neutrino Data

The Belle II Physics Book

The role of theory input for exclusive Vcb​ determinations

Neutral D→KK∗ decays as discovery channels for charm CP violation

R(D∗), ∣Vcb​∣, and the Heavy Quark Symmetry relations between form factors

A fresh look at the determination of |V_cb| from B-> D^* l nu

CP asymmetries in D→PP′ decays

CP Violation in D0→KS​KS​

A Precision Relation between $Γ (K \to μ^{+} μ^{-}) (t)$ and $B (K_{L} \to μ^{+} μ^{-}) / B (K_{L} \to γ γ)$

CP violation in $b$ and $c$ quark decays

A $U$ -Spin Anomaly in Charm CP Violation

The Mathematical Structure of $U$ -Spin Amplitude Sum Rules

$K \to μ^{+} μ^{-}$ as a clean probe of short-distance physics

Probing the $Δ U = 0$ Rule in Three Body Charm Decays

Relations between $b \to c τ ν$ Decay Modes in Scalar Models

SU(3) $_{F}$ Analysis for Beauty Baryon Decays

The $V_{c b}$ puzzle: an update

The Emergence of the $Δ U = 0$ Rule in Charm Physics

The role of theory input for exclusive $V_{c b}$ determinations

Neutral $D \to K K^{*}$ decays as discovery channels for charm CP violation

$R (D^{*})$ , $∣ V_{c b} ∣$ , and the Heavy Quark Symmetry relations between form factors

CP asymmetries in $D \to P P^{'}$ decays

CP Violation in $D^{0} \to K_{S} K_{S}$