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View article: Accelerator-based dark matter searches
Accelerator-based dark matter searches Open
In this chapter, we review Canadian efforts to search for dark matter at accelerator experiments, discussing Belle II and SuperKEKB, DarkLight, and MATHUSLA. This is an important direction in the search for astrophysical dark matter, as ma…
View article: The Belle II Detector Upgrades Framework Conceptual Design Report
The Belle II Detector Upgrades Framework Conceptual Design Report Open
We describe the planned near-term and potential longer-term upgrades of the Belle II detector at the SuperKEKB electron-positron collider operating at the KEK laboratory in Tsukuba, Japan. These upgrades will allow increasingly sensitive s…
View article: Photon Reconstruction in the Belle II Calorimeter Using Graph Neural Networks
Photon Reconstruction in the Belle II Calorimeter Using Graph Neural Networks Open
We present the study of a fuzzy clustering algorithm for the Belle II electromagnetic calorimeter using Graph Neural Networks. We use a realistic detector simulation including simulated beam backgrounds and focus on the reconstruction of b…
View article: Model-independent extraction of form factors and $|V_{cb}|$ in $\overline{B} \rightarrow D \ell^- \overlineν_\ell$ with hadronic tagging at BaBar
Model-independent extraction of form factors and $|V_{cb}|$ in $\overline{B} \rightarrow D \ell^- \overlineν_\ell$ with hadronic tagging at BaBar Open
Using the entire BaBar $Υ(4S)$ data set, the first two-dimensional unbinned angular analysis of the semileptonic decay $\overline{B} \rightarrow D \ell^- \overlineν_\ell$ is performed, employing hadronic reconstruction of the tag-side $B$ …
View article: Photon Reconstruction in the Belle II Calorimeter Using Graph Neural Networks
Photon Reconstruction in the Belle II Calorimeter Using Graph Neural Networks Open
We present the study of a fuzzy clustering algorithm for the Belle II electromagnetic calorimeter using Graph Neural Networks. We use a realistic detector simulation including simulated beam backgrounds and focus on the reconstruction of b…
View article: Feebly-Interacting Particles: FIPs 2022 Workshop Report
Feebly-Interacting Particles: FIPs 2022 Workshop Report Open
Particle physics today faces the challenge of explaining the mystery of dark matter, the origin of matter over anti-matter in the Universe, the origin of the neutrino masses, the apparent fine-tuning of the electro-weak scale, and many oth…
View article: Search for heavy neutral leptons using tau lepton decays at <i>BaBaR</i>
Search for heavy neutral leptons using tau lepton decays at <i>BaBaR</i> Open
This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model τ neutrino with a mixing strength of |Uτ4|2, corresponding to the absolute sq…
View article: Searches for dark photons at accelerators
Searches for dark photons at accelerators Open
Dark sector models attempt to describe observed dark matter properties, as well as other anomalies such as muon ( g − 2), possible violations of lepton universality in B decay, and the possible observation of a new particle by the ATOMKI e…
View article: Exploring Dark Sector Portals with High Intensity Experiments
Exploring Dark Sector Portals with High Intensity Experiments Open
A broad program of searches at high intensity experiments during the coming decade and beyond will sensitively probe new light mediator particles interacting through the minimal renormalizable vector, Higgs, and neutrino portals as well as…
View article: Search for an Axionlike Particle in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math> Meson Decays
Search for an Axionlike Particle in Meson Decays Open
Axionlike particles (ALPs) are predicted in many extensions of the standard model, and their masses can naturally be well below the electroweak scale. In the presence of couplings to electroweak bosons, these particles could be emitted in …
View article: Forecasting dark showers at Belle II
Forecasting dark showers at Belle II Open
Dark showers from strongly interacting dark sectors that confine at the GeV scale can give rise to novel signatures at $e^+e^-$ colliders. In this work, we study the sensitivity of $B$ factory experiments to dark showers produced through a…
View article: Search for Lepton Flavor Violation in $Υ(3S)\rightarrow e^{\pm}μ^{\mp}$
Search for Lepton Flavor Violation in $Υ(3S)\rightarrow e^{\pm}μ^{\mp}$ Open
We report on the first search for electron-muon lepton flavor violation (LFV) in the decay of a $b$~quark and $b$~antiquark bound state. We look for the LFV decay $Υ(3S)\rightarrow e^{\pm}μ^{\mp}$ in a sample of 118~million $Υ(3S)$ mesons …
View article: Search for Darkonium in $e^+e^-$ Collisions
Search for Darkonium in $e^+e^-$ Collisions Open
Collider searches for dark sectors, new particles interacting only feebly with ordinary matter, have largely focused on identifying signatures of new mediators, leaving much of dark sector structures unexplored. In particular, the existenc…
View article: Searches for Dark Photons at Accelerators
Searches for Dark Photons at Accelerators Open
Dark matter particles may interact with other dark matter particles via a new force mediated by a dark photon, A′, which would be the dark-sector analog to the ordinary photon of electromagnetism. The dark photon can obtain a highly suppre…
View article: Physics reach of a long-lived particle detector at Belle II
Physics reach of a long-lived particle detector at Belle II Open
We have studied three realistic benchmark geometries for a new far detector GAZELLE to search for long-lived particles at the \superkekb accelerator in Tsukuba, Japan. The new detector would be housed in the same building as Belle II and o…
View article: Search for the rare decay B0→D*0γ
Search for the rare decay B0→D*0γ Open
SLAC for its support and the kind hospitality extended to them. This work is supported by the US Department of Energy and National Science Foundation, the Natural Sciences and Engineering Research Council (Canada), Institute of High Energy…
View article: Measurement of B→Xγ Decays and Determination of |Vtd/Vts|
Measurement of B→Xγ Decays and Determination of |Vtd/Vts| Open
Using a sample of 383 × 10 6 B ¯¯¯ B events collected by the BABAR experiment, we measure sums of seven exclusive final states B → X d ( s ) γ , where X d ( X s ) is a nonstrange (strange) charmless hadronic system in the mass range 0.6 - …
View article: Search for B+→ℓ+νℓ recoiling against B−→D0ℓ−¯νX
Search for B+→ℓ+νℓ recoiling against B−→D0ℓ−¯νX Open
We present a search for the decay B + → ℓ + ν ℓ ( ℓ = τ , μ , or e ) in ( 458.9 ± 5.1 ) × 10 6 B ¯¯¯ B pairs recorded with the BABAR detector at the PEP-II B -factory. We search for these B decays in a sample of B + B − events where one B …
View article: Search for a Stable Six-Quark State at BABAR
Search for a Stable Six-Quark State at BABAR Open
Recent investigations have suggested that the six-quark combination uuddss could be a deeply bound state (S) that has eluded detection so far, and a potential dark matter candidate. We report the first search for a stable, doubly strange s…
View article: Measurement of the Spectral Function for the τ⁻→ K⁻K[subscript S]ν[subscript τ] Decay
Measurement of the Spectral Function for the τ⁻→ K⁻K[subscript S]ν[subscript τ] Decay Open
The decay τ⁻→K⁻K[subscript S]ν[subscript τ] has been studied using 430×10⁶ e⁺e⁻→τ⁺τ⁻ events produced at a center-of-mass energy around 10.6 GeV at the PEP-II collider and studied with the BABAR detector. The mass spectrum of the K⁻K[subscr…
View article: Search for the decay mode B[superscript 0] → pp[¯ over p][¯ over p]
Search for the decay mode B[superscript 0] → pp[¯ over p][¯ over p] Open
A search is presented for the four-body decay B[superscript 0] → pp[¯ over p][¯ over p] in a sample of 471 million B[¯ B] pairs collected with the BABAR detector, operated at the SLAC PEP-II asymmetric-energy e[superscript +]e[superscript …
View article: Study of ϒ(1S) Radiative Decays to γπ[superscript +]π[superscript −] and γ K[superscript +]K[superscript −]
Study of ϒ(1S) Radiative Decays to γπ[superscript +]π[superscript −] and γ K[superscript +]K[superscript −] Open
We study the ϒ(1S) radiative decays to γπ[superscript +}]π[superscript -] and γK[superscript +]Kp[superscript -] using data recorded with the BABAR detector operating at the SLAC PEP-II asymmetric-energy e[superscript +]e[superscript -] co…
View article: Study of the process e[superscript +] e[superscript −] → π[supsercript +]π[superscript −]η using initial state radiation
Study of the process e[superscript +] e[superscript −] → π[supsercript +]π[superscript −]η using initial state radiation Open
We study the process e[superscript +]e[superscript -] →π[superscript +]π[superscript -]ηγ, where the photon is radiated from the initial state. About 8000 fully reconstructed events of this process are selected from the BABAR data sample w…
View article: Measurement of the e [superscript +] e [superscript −] → π [superscript +] π [superscript −] π [superscript 0] π [superscript 0] cross section using initial-state radiation at BABAR
Measurement of the e [superscript +] e [superscript −] → π [superscript +] π [superscript −] π [superscript 0] π [superscript 0] cross section using initial-state radiation at BABAR Open
The process e [superscript +] e [superscript -] →π [superscript +] π [superscript -] 2π [superscript 0] γ is investigated by means of the initial-state radiation technique, where a photon is emitted from the incoming electron or positron. …