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Recent Belle II results on time-dependent CP violation and charm physicsPublic
We present recent measurements of time-dependent CP violation and charm physics results from the Belle~II experiment. Time-dependent CP violation studies include $B^0\rightarrow\phi K^0_S$, $B^0\rightarrow K^0_S \pi^0$, and $B^0\rightarrow K^0_S K^0_S K^0_S$ decay channels. Recent lifetime measurements for charmed hadrons, including the $\Lambda_c… |
BELLE2-CONF-PROC-2023-030 | - | 2023-07-19 |
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An Update on Demographics and Diversity and Inclusion Efforts with the Belle II CollaborationPublic
The Belle II Collaboration comprises over 1000 international high energy physicists, who investigate the properties of -quarks and other particles at the luminosity frontier. In order to achieve our aim of a successful physics program, it is essential that we emphasise contributions from a diverse community. Belle II has thus far focused on divers… |
BELLE2-TALK-CONF-2024-075 | - | 2023-07-18 |
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Recent Belle II results on semileptonic B decays and tests of lepton-flavor universalityPublic
Semileptonic $B$-meson decays allow for determining the magnitudes of the CKM matrix parameters $|V_{cb}|$ and $|V_{ub}|$, two fundamental parameters of the SM flavor sector and to probe the excess rate of semitauonic $B$ decays, which has been consistently above expectations in recent years. Belle II analyses use both exclusive decays such as $B … |
BELLE2-TALK-CONF-2023-097 | - | 2023-07-18 |
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Semileptonic B decays at Belle II and BellePublic
Precise determination of the magnitudes and phases of the elements, in particular, Vcb and Vub, of the Cabibbo-Kobayashi-Maskawa (CKM) matrix is crucial for testing the unitarity of the CKM matrix, hence testing the Standard Model. The magnitudes of these elements are best measured by using B-meson semileptonic decays. Moreover, semileptonic B-mes… |
BELLE2-TALK-CONF-2023-098 | - | 2023-07-18 |
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Recent dark-sector and tau physics results at Belle IIPublic
Belle has unique reach for a broad class of models that postulate the existence of dark matter particles with MeV—GeV masses. In addition, the low-background environment of electron-positron collisions and an hermetic detector make Belle II the premier experiment for studying tau-lepton physics. This talk presents recent world-leading results from… |
BELLE2-TALK-CONF-2023-107 | - | 2023-07-17 |
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Recent Belle II results on radiative and electroweak penguin decaysPublic
Decays of B mesons that proceed through radiative penguin amplitudes probe a large class of generic non-SM models for which Belle II has unique reach. We present recent results from an inclusive b-> s,gamma analysis and a B->rho,gamma analysis. In addition, we report results on b->s,l+,l- decays of B mesons, which proceed through electroweak pengu… |
BELLE2-TALK-CONF-2023-106 | - | 2023-07-17 |
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The new Belle II charm flavor taggerPublic
Charm physics, involving a heavy up-type quark, offers a pathway to search for new particles and couplings beyond the Standard Model complementary to that of B physics. Measurements of CP violation and mixing play a key role in this program. We present a novel algorithm that identifies the flavor of neutral charm mesons at the time of production. … |
BELLE2-TALK-CONF-2023-101 | - | 2023-07-17 |
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Measurements of charm lifetimes at Belle IIPublic
Charm physics, involving a heavy up-type quark, offers a pathway to search for new particles and couplings beyond the Standard Model complementary to that of B physics. A program based on precision measurements of charm lifetimes is now underway at Belle II, and benefits from the detector`s outstanding vertexing performance and low-background envi… |
BELLE2-TALK-CONF-2023-100 | - | 2023-07-17 |
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Recent Belle II results on time-dependent CP violation and charm physicsPublic
Time-dependent measurements of CP violation are chief goals of the Belle II physics program. Comparison between penguin-dominated b ->qqbars and tree-dominated b -> ccbars results allows for stringent tests of CKM unitarity that are sensitive to non-SM physics. This program requires excellent vertexing capabilities. After presenting recent world-l… |
BELLE2-TALK-CONF-2023-104 | - | 2023-07-17 |
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Belle~II results related to $b \to c$ anomaliesPublic
We report two new measurements for tests of lepton flavor universality between electrons and muons using semileptonic $B$ decays with a data set of $189~\mathrm{fb}^{-1}$ collected at the Belle II experiment between 2019 and 2021. Firstly, we find a ratio of inclusive branching fractions at $R(X_{e/\mu}) \equiv \mathcal{B}(\overline{B} \rightarrow… |
BELLE2-CONF-PROC-2023-029 | - | 2023-07-17 |
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Semileptonic b-hadron decays (Belle II / LHCb)Public
This talk will cover the most recent results of semileptonic b-hadron decays from the Belle II and LHCb experiments and their implications to potential new physics beyond the standard model. |
BELLE2-TALK-CONF-2023-103 | - | 2023-07-17 |
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Recent Belle II results on hadronic B decaysPublic
The investigation of B-meson decays into charmed and charmless hadronic final states is a keystone of the Belle II program. It offers theoretically reliable and experimentally precise constraints on CKM unitarity, it is sensitive to effects from non-SM physics, and it furthers knowledge about uncharted b->c hadronic transitions. Recent results on … |
BELLE2-TALK-CONF-2023-105 | - | 2023-07-17 |
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Recent quarkonium results at Belle IIPublic
Belle II offers unique possibilities for the discovery and interpretation of exotic multiquark states to probe the fundamentals of QCD. This talk presents recent results on searches for the hidden bottom transition between Y(10750) and chi_bJ, and measurements of the energy dependence of the e+e- => B(*)Bbar(*) cross section. |
BELLE2-TALK-CONF-2023-108 | - | 2023-07-17 |
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Belle II and LHCb Upgrade I performancePublic
Summary of the performance of Belle II and of LHCb after Upgrade I. |
BELLE2-TALK-CONF-2023-102 | - | 2023-07-17 |
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The Belle II Upgrade ProgramPublic
The Belle II experiment at the SuperKEKB e+e- collider has started data taking in 2019 with the perspective of collecting 50ab$^{-1}$ in the course of the next several years. The wealth of physics results obtained with the current data sample of about 400fb$^{-1}$ is showing that the detector is working well with very good performance, but the fir… |
BELLE2-TALK-CONF-2023-099 | - | 2023-07-14 |
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Search for the decay $B \rightarrow D^* \eta \pi$ in Belle IIPublic
Recent measurements of semileptonic decays show a difference between the branching ratio of the sum of exclusive decay rates and the inclusive $b \rightarrow c \ell \nu$ decay rate (the so-called Semi-Leptonic (SL) gap) which affects the interpretation of the CKM element $|Vcb|$. Large contributions from not-yet measured $B \rightarrow D^* \eta \e… |
BELLE2-CONF-PROC-2023-028 | - | 2023-07-12 |
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Charged Particle Identification with the TOP detector at Belle IIPublic
The Belle II detector is located at the SuperKEKB energy-asymmetric $e^{+}$-$e^{-}$ collider and has acquired the world’s highest instantaneous luminosity this year. Charged particle identification (PID) in Belle II is provided by the TOP (Time Of Propagation) counters in the barrel region. We report the overall and TOP-focused PID performance in … |
BELLE2-CONF-PROC-2023-026 | - | 2023-07-12 |
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Charged Particle Identification Performances in Belle IIPublic
An efficient Particle identification(PID) is crucial for Belle II as it deals with a much higher event rate than Belle and ultimately with a more extensive background. PID is advantageous in suppressing background, studying rare decays, and for the flavor tagging of B-mesons. We study the charged Kaon and Pion identification performances based on … |
BELLE2-CONF-PROC-2023-027 | - | 2023-07-12 |
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Search for Wrong-Sign D0 → K+π−π0 decay at Belle IIPublic
In the standard model, mixing and CP violation in the charm sector are expected to be very small, and thus, they constitute a sensitive probe for potential new physics contributions. The “wrong-sign” D0 → K+π−π0 decay is one of the most promising decay channels at Belle II. In this work, we developed a fit strategy for the “wrong-sign” D0 → K+π−π0… |
BELLE2-CONF-PROC-2023-024 | - | 2023-07-12 | |
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Study of photon energy bias using π0 → γγ decays from D∗+ −→ D0(→ K−π+π0)π+ at Belle IIPublic
Photon energy bias is used to compute the corrections to the reconstructed photon energy and improve data-simulation agreement in analyses having final states with photons. In this study, we reconstruct clean samples of π0 → γγ decay from the D∗+ → D0(→ K−π+π0)π+ decay chain in both simulation and data collected by Belle II experiment. A detailed … |
BELLE2-CONF-PROC-2023-025 | - | 2023-07-12 |