# Flavor 2019: new Physics in flavor from LHC to Belle II

Europe/Berlin
E.0.11 (Max Planck Institute for Astrophysics (MPA) )

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
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Description

The topical workshop  "Flavor 2019: new Physics in flavor from LHC to Belle II" is a three-day workshop to be held at MIAPP from May 20-22 2019. It will focus on the hot topics in flavor physics in an era where new and exciting results are coming in from LHC experiments, but also the Belle-II experiment has entered the stage. The workshop is embedded in the 4-week program "Beyond the Standard Model with Precision Flavor Experiments". Registration for the workshop is independent of the participation in the program (but program participants are invited to register and participate).

There will be no workshop fee. Participants interested to join the conference dinner, will have to pay in cash upon arrival. The amount will be published soon. A receipt stating that we received money to cover expenses related to the topical workshop will be issued but we are not allowed to issue invoices.

Confirmed speakers include:

• Admir Greljo (CERN)
• Diego Guadagnoli (Annecy)
• Jernej Kamenik (Ljubljana)
• Andreas Kronfeld (Fermilab)
• Zoltan Ligeti (Berkeley)
• Matthias Neubert (Mainz)
• Paride Paradisi (Padua)
Participants
• Admir Greljo
• Adrian Carmona Bermudez
• Amarjit Soni
• Andreas Weiler
• Andrzej Buras
• Angela Papa
• Angelo Di Canto
• Annarita Buonaura
• Ben Gripaios
• Benedikt Wach
• Biplab Dey
• Blazenka Melic
• Christoph Schwanda
• Daniel Egana-Ugrinovic
• Daniel Greenwald
• Danny van Dyk
• Dario Buttazzo
• David McKeen
• David Straub
• Diego Guadagnoli
• Eungjin Chun
• Fady Bishara
• Francesco Tenchini
• Giancarlo D'Ambrosio
• Hans-Günther Moser
• Jason Aebischer
• Jernej F. Kamenik
• Johannes Albrecht
• Jonas Rademacker
• Jure Zupan
• Kilian Lieret
• lina Alasfar
• Lorenzo Calibbi
• Lu Cao
• Luca Merlo
• Maria Cerdà-Sevilla
• Martin Beneke
• Martin Sevior
• Matthias Neubert
• Michael Baker
• Mirco Dorigo
• Monika Blanke
• Nejc Košnik
• Nico Gubernari
• PABLO GOLDENZWEIG
• Paride Paradisi
• Patrick Owen
• Peter Stangl
• Rainer Wanke
• Robert Szafron
• Sebastien Descotes-Genon
• Simon Eidelman
• Simon Wehle
• Svjetlana Fajfer
• Thomas Kuhr
• Titus Mombächer
• Tobias Huber
• Tobias Hurth
• Vladimir Savinov
• Wojciech Wislicki
• Wolfgang Altmannshofer
• Zoltan Ligeti
MIAPP Office
• Monday, 20 May
• 12:00 13:00
Lunch break 1h
• 13:00 14:00
Registration E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
• 14:00 14:30
Flavor Physics at Belle II 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is $8\times 10^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data, a factor of 50 more than its predecessor. With this data set, Belle II will be able to measure the Cabibbo-Kobayashi-Maskawa (CKM) matrix, the matrix elements and their phases, with unprecedented precision and explore flavor physics with $B$ and charmed mesons, and $\tau$ leptons. Belle II has also a unique capability to search for low mass dark matter and low mass mediators. We also expect exciting results in quarkonium physics with Belle II. From February to July of this year, the machine has completed a commissioning run, achieved a peak luminosity of $5.5\times 10^{33}$ cm$^{-2}$s$^{-1}$, and Belle II has recorded a data sample of about 0.5 fb$^{-1}$. Regular operations are expected to start in March 2019. In this presentation, we will review the status of the Belle II detector, the results of the commissioning run and the near-term prospects for physics at Belle II.

Speaker: Francesco Tenchini
• 14:30 15:00
Anomalies in b->s ll transitions (LHCb) 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

The concept of lepton universality, where the muon and tau particles are simply heavier copies of the electron, is a key prediction in the Standard Model (SM). In models beyond the SM, lepton universality can be naturally violated with new physics particles that couple preferentially to the second and third generation leptons. Over the last few years, several hints of lepton universality violation have been seen in both b->c and b->s semileptonic beauty decays. This presentation will review the anomalies in b->s ll transitions and give an outlook for the near future.

Speaker: Titus Mombächer
• 15:00 15:30
Progress in Lattice QCD in the B and D Systems 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Andreas Kronfeld (Fermilab)
• 15:30 16:00
Coffee break 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
• 16:00 16:30
Muon Lepton Flavor Violation 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Angela Papa
• 16:30 17:00
Lepton Flavor Violation 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Lorenzo Calibbi
• 17:00 17:30
Tau/Charm factory 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Simon Eidelmann
• Tuesday, 21 May
• 09:00 09:30
Aligned and Spontaneous Flavor Violation 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

We present a spurion setup called Spontaneous Flavor Violation (SFV) that allows for new physics couplings to quarks that are aligned with the Standard Model Yukawas, but do not necessarily share their hierarchies nor are family universal. We show that SFV naturally arises in theories where the quark family number and CP groups are spontaneously broken at a UV scale. In SFV extensions of the Standard Model, FCNCs are strongly suppressed via the GIM mechanism. We apply this novel flavor Ansatz to a 2HDM, showing that new physics with significant and preferential couplings to first or second generation quarks may be at the electroweak scale. The SFV Ansatz provides strong motivation to search for new physics with generation-specific couplings at colliders.

Speaker: Daniel Egana-Ugrinovic (Stony Brook University)
• 09:30 10:00
Flavor Clockwork 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Adrian Carmona
• 10:00 10:30
Effective Field Theories for X Y Z 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Nora Brambilla (Physik Department, TU Munich)
• 10:30 11:00
Coffee break 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
• 11:00 11:30
Exotic and Conventional Quarkonium Physics Prospects at Belle II 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

The Belle II experiment at the SuperKEKB energy-asymmetric $e^+ e^-$ collider is a substantial upgrade of the B factory facility at KEK in Tsukuba, Japan. It aims to record a factor of 50 times more data than its predecessor. The experiment completed a commissioning run in 2018, and began full operation in early 2019. Belle II is uniquely capable of studying the so-called "XYZ" particles: heavy exotic hadrons consisting of more than three quarks. First discovered by Belle, these now number in the dozens, and represent the emergence of a new category within quantum chromodynamics. This talk will present the prospects of Belle II to explore both exotic and conventional quarkonium physics.

Speaker: Vladimir Savinov
• 11:30 12:00
CP violation and rare decays in charm decays with LHCb 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

The LHCb experiment has collected large samples of decays of charmed hadrons, and has made measurements of CP violation and mixing parameters with world-leading precision. Recent results on charm physics at LHCb are presented.

Speaker: Angelo Di Canto
• 12:00 12:30
CP violation in charm 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Jernej Kamenik
• 12:30 14:00
Lunch break 1h 30m
• 14:00 14:30
Semileptonic and leptonic results from 2018 Belle II commissioning data 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

The Belle II experiment, located at the SuperKEKB accelerator complex near Tokyo in
Japan, has started its 2019 run to collect collision events at large instantaneous
luminosities. In this presentation we show first results from studying missing energy
signatures, such as leptonic and semileptonic B meson decays: We report first studies
on re-measuring important standard candle processes, such as abundant inclusive B to l X and B to D l decays, and evaluate the performance of our machine learning based
tagging algorithms. In addition, we plan to show first results on control regions and
sidebands relevant for re-establishing B to D
and B decays with future Belle II data. We
further discuss the potential of Belle II to study the present day anomaly in ratios of
charm semileptonic decays with tau-leptons to light leptons, known as R(D) and R(D*)in
the literature, with future Belle II data and its potential to measure similar ratios with
other hadronic final states.

Speaker: Cao Lu
• 14:30 15:00
A four-dimensional form-factor fit to B->D*lnu with hadronic tagging from BaBar 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

We present results on the first full 4-dimensional angular analysis of B->Dlnu, using the e+e- collision dataset collected by the BaBar experiment at the Y(4S) resonance. One B meson from the Y(4S)->BBbar decay is fully reconstructed in a hadronic decay mode which constrains the kinematics and provides a precise determination of the neutrino momentum vector. We extract the underlying hadronic form-factors employing the model-independent BGL approach and a value for the CKM matrix element Vcb. Last, employing our measured BGL form-factors, we provide new predictions within the Standard Model, for observables related to the the semi-tauonic decay B->Dtaunu.

Speaker: Biplap Dey
• 15:00 15:30
$\Lambda_b \to \Lambda_c\ell\bar\nu$ and $V_{cb}$: keep HQETing 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Zoltan Ligeti
• 15:30 16:00
Coffee break 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
• 16:00 16:30
The flavor of ALP 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Prof. Matthias Neubert (JGU Mainz)
• 16:30 17:00
Axion flavour models and ALP production at B factories 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Luca Merlo (Universidad Autonoma de Madrid)
• 17:00 17:30
BSM Physics with Kaon Decays at NA62 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

The NA62 experiment at CERN SPS was designed to measure BR(K+ -> pi+ nu nu-bar) with in-flight decays, a novel technique for this channel. NA62 took its first physics data in 2016, reaching sensitivity to the decay at the Standard Model BR. The experiment collected 10 times more statistics in 2017 and a similar amount of data is expected from the 2018 run. The result on K+ -> pi+ nu nu from the full 2016 data set will be presented and prospects for future improvements will be discussed.
A large sample of charged kaon decays into final states with multiple charged particles was also collected in 2016-2018. The sensitivity to a number of Lepton Flavour and Lepton Number violating K+ decays provided by this data set is an order of magnitude beyond the current state of the art. Results of the search for these processes with a partial NA62 data sample are available for presentation.

Speaker: Rainer Wanke
• 19:30 21:30
Conference Dinner 2h Zum Franziskaner

#### Zum Franziskaner

Residenzstr. 9 80333 Munich
• Wednesday, 22 May
• 09:00 09:30
Radiative decays at LHCb 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Biplap Dey
• 09:30 10:00
Flavour Physics with High-pT Leptons 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Dr Admir Greljo (CERN)
• 10:00 10:30
More tests of B-decay discrepancies 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Diego Guadagnoli (TUM)
• 10:30 11:00
Coffee break 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
• 11:00 11:30
Theory progress in inclusive b->qll decays 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Tobias Huber
• 11:30 12:00
Power corrections to the inclusive b > s,d ll decays 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Tobias Hurth
• 12:00 12:30
Charm-loop effect in B->K(*)ll decays beyond leading twist 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

We revisit soft gluon contributions to the "charm loop" effect in rare $B\to K^{(*)}ll$ decays, which is a large systematic uncertainty in the interpretation of the $b$-anomalies. Since these contributions are dominated by long-distance effects and are resistant to factorization attempts, we employ the method of light-cone sum rules to compute the relevant hadronic matrix elements. Our calculation extends previous works by considering the full set of the three-particle $B$-meson distribution amplitudes. We provide first numerical results, and discuss qualitatively their impact on the extraction of the Wilson coefficient $C_9$.

Speaker: Nico Gubernari (technische universität münchen)
• 12:30 14:00
Lunch break 1h 30m
• 14:00 14:30
Vcb 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
Speaker: Christoph Schwanda
• 14:30 15:00
CP violation in beauty decays with LHCb 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

Precision measurements of CP violating observables in b hadron decays are powerful probes to search for physics effects beyond the Standard Model. The most recent results on CP violation in the decay, mixing and interference of b hadrons obtained by the LHCb Collaboration will be presented, with particular focus on results obtained exploiting the data collected during the Run 2 of LHC. These results represent the world's best constraints, some of which are world-first measurements, of the CP violating phase phi_s.

Speaker: Mirco Dorigo
• 15:00 15:30
High-pT Signatures in Vector-Leptoquark Models 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

We present a detailed analysis of the collider signatures of TeV-scale massive vector bosons motivated by the hints of lepton flavour non-universality observed in $B$-meson decays. We analyse three representations that necessarily appear together in a large class of ultraviolet-complete models: a colour-singlet ($Z'$), a colour-triplet (the $U_1$ leptoquark), and a colour octet ($G'$). Under general assumptions for the interactions of these exotic states with Standard Model fields, including in particular possible right-handed and flavour off-diagonal couplings or the $U_1$, we derive a series of stringent bounds on masses and couplings that constrain a wide range of explicit new-physics models.

Speaker: Michael Baker (University of Zurich)
• 15:30 16:00
Coffee break 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany
• 16:00 16:30
Anomalies in semileptonic B decays (LHCb) 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

Rare decays are powerful probes for Physics beyond the Standard Model (SM), as new particles can have a large impact on physics observables. Recent results on lepton universality tests and measurements of branching fractions and angular distributions of rare b->sll decays have shown tensions with the SM predictions. A review of the latest lepton universality tests in semileptonic b →clν transitions is reported.

Speaker: Annarita Buonaura
• 16:30 17:00
New Physics in b → c τ ν: From R(D), R(D*) to Polarisation Observables, B_c → τ ν, and Λ_b → Λ_c τ ν 30m E.0.11

### E.0.11

#### Max Planck Institute for Astrophysics (MPA)

Karl-Schwarzschild-Str. 1 85748 Garching Germany

In this talk I review the status of new physics in b→cτν transitions in the EFT framework of dimension-six operators, including the very recent Belle results. The fit results, including the recent measurement of FL(D), are presented for all one- and two-dimensional scenarios resulting from the tree level exchange of a single new particle. Particular emphasis is put on the constraint from the Bc→τν decay rate. I introduce a sum rule for the branching ratios of B→Dτν, B→Dτν and Λb→Λc τν which holds for any NP contribution to the Wilson coefficients and predicts an enhancement of the latter decay w.r.t. the Standard Model. I also discuss correlations between the polarisation observables in B→Dτν, B→D*τν and their model-discriminating prospects.

Speaker: Monika Blanke (Karlsruhe Institute of Technology)