The Detectors of the Mu2e Experiment

The LCFIVertex package: vertexing, flavour tagging and vertex charge reconstruction with an ILC vertex detector

The precision measurements envisaged at the International Linear Collider (ILC) depend on excellent instrumentation and reconstruction software. The correct identification of heavy flavour jets, placing unprecedented requirements on the quality of the vertex detector, will be central for the ILC programme. This paper describes the LCFIVertex software, which provides tools for vertex finding and for identification of the flavour and charge of the leading hadron in heavy flavour jets. These tools are essential for the ongoing optimisation of the vertex detector design for linear colliders such a…

Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV

Many measurements and searches for physics beyond the standard model at the LHC rely on the efficient identification of heavy-flavour jets, i.e. jets originating from bottom or charm quarks. In this paper, the discriminating variables and the algorithms used for heavy-flavour jet identification during the first years of operation of the CMS experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, are presented. Heavy-flavour jet identification algorithms have been improved compared to those used previously at centre-of-mass energies of 7 and 8 TeV. For jets with transverse …

Status of charged lepton flavour violation search with MEG II experiment

The MEG II experiment searches for the Charged Lepton Flavour Violating (CLFV) decay $μ\rightarrow e γ$. This decay is foreseen by the Standard Model (SM) of Particle Physics at non observable rates through neutrino oscillation. Observing it would be a clear signal of new physics (e.g. SUSY-GUT). After publishing the current upper limit to the Branching Ratio (BR) of this decay in 2016, BR($μ^+\rightarrow e^+ γ)<4.2\times10^{-13}$, the MEG experiment started the upgrade of its detector in order to increase the sensitivity by a factor 10, starting the MEG II phase. The aim of this work is to re…

迈向用异构图神经网络取代探测器模拟在风味物理分析中的应用

Towards replacing detector simulation with heterogeneous GNNs in flavour physics analyses

本文提出了一种基于异构图神经网络的快速模拟工具，用于在LHCb实验中取代传统探测器模拟，通过学习通用模式来建模复杂变量关系。

Charge Transfer Inefficiency Studies for CCD Vertex Detectors at a LC

The Linear Collider Flavour Identification (LCFI) collaboration studies CCD detectors for quark flavour identification in the framework of a future linear e+e- collider. The flavour identification is based on precision reconstruction of charged tracks very close to the interaction point. Therefore, this detector will be exposed to a high level of radiation and thus an important aspect of the vertex detector development are radiation hardness studies. Results of detailed simulations of the charged transport properties of a CCD prototype chip are reported and compared with initial measurements. …

Searching for Lepton Flavour Violation with the Mu3e Experiment

The upcoming Mu3e experiment searches for the lepton flavour violating decay $μ^+\,\rightarrow\,e^+ e^- e^+$ with the aim of a final sensitivity of one signal decay in $10^{16}$ observed muon decays, an improvement over the preceding SINDRUM experiment by four orders of magnitude. In the first phase, the experiment will be operated at an existing intense muon beam line at the Paul Scherrer Institute. With muon stopping rates of about $10^{8}\text{s}^{-1}$, a single-event sensitivity of $2\cdot 10^{-15}$ can be achieved. For the ultimate sensitivity, a new high intensity muon beam line is requi…