99 research outputs found
Choose Your Diffusion: Efficient and flexible ways to accelerate the diffusion model in fast high energy physics simulation
The diffusion model has demonstrated promising results in image generation,
recently becoming mainstream and representing a notable advancement for many
generative modeling tasks. Prior applications of the diffusion model for both
fast event and detector simulation in high energy physics have shown
exceptional performance, providing a viable solution to generate sufficient
statistics within a constrained computational budget in preparation for the
High Luminosity LHC. However, many of these applications suffer from slow
generation with large sampling steps and face challenges in finding the optimal
balance between sample quality and speed. The study focuses on the latest
benchmark developments in efficient ODE/SDE-based samplers, schedulers, and
fast convergence training techniques. We test on the public CaloChallenge and
JetNet datasets with the designs implemented on the existing architecture, the
performance of the generated classes surpass previous models, achieving
significant speedup via various evaluation metrics
Muon Beam for Neutrino CP Violation: connecting energy and neutrino frontiers
We propose here a proposal to connect neutrino and energy frontiers, by
exploiting collimated muon beams for neutrino oscillations, which generate
symmetric neutrino and antineutrino sources: and . Interfacing with long baseline neutrino detectors such as
DUNE and T2K, this experiment can be applicable to measure tau neutrino
properties, and also to probe neutrino CP phase, by measuring muon electron
(anti-)neutrino mixing or tau (anti-)neutrino appearance, and differences
between neutrino and antineutrino rates. There are several significant benefits
leading to large neutrino flux and high sensitivity on CP phase, including 1)
collimated and manipulable muon beams, which lead to a larger acceptance of
neutrino sources in the far detector side; 2) symmetric and
beams, and thus symmetric neutrino and antineutrino sources, which make this
proposal ideally useful for measuring neutrino CP violation. More importantly,
and , and, and oscillation signals can be collected simultaneously, with no needs for
separate specific runs for neutrinos or antineutrinos. Based on a simulation of
neutrino oscillation experiment, we estimate tau (anti-) neutrinos can
be collected within 5 years which makes this proposal suitable for a brighter
tau neutrino factory. Moreover, more than 7 standard deviations of sensitivity
can be reached for \dcp = |\pi/2|, within only five ears of data taking, by
combining tau and muon (anti-) neutrino appearances. With the development of a
more intensive muon beam targeting future muon collider, the neutrino potential
of the current proposal will surely be further improved.Comment: Additional fixes included. In this new version, we have now
strengthened our results by carrying out a solid physics simulation with the
help of GLoBES, a sophisticated software package for the simulation of long
baseline neutrino oscillation experiments. The results are compared with
previous qualitative estimations, and are found to be in reasonable agreemen
Searching for Majorana Neutrinos at a Same-Sign Muon Collider
Majorana properties of neutrinos have long been a focus in the pursuit of
possible new physics beyond the standard model, which has motivated lots of
dedicated theoretical and experimental studies. A future same-sign muon
collider is an ideal platform to search for Majorana neutrinos through the
Lepton Number Violation process. Specifically, this t-channel kind of process
is less kinematically suppressed and has a good advantage in probing Majorana
neutrinos at high mass regions up to 10 TeV. In this paper, we perform a
detailed fast Monte Carlo simulation study through examining three different
final states: 1) pure-leptonic state with electrons or muons, 2) semi-leptonic
state, and 3) pure-hadronic state in the resolved or merged categories.
Furthermore, we perform a full simulation study on the pure-leptonic final
state to validate our fast simulation results.Comment: 15 pages, 8 figure
A Comparative Study of Z mediated Charged Lepton Flavor Violation at future lepton colliders
Charged lepton flavor violation (CLFV) represents a transition between
charged leptons of different generations that violates lepton flavor
conservation, which is a clear signature of possible new physics beyond the
standard model. By exploiting a typical example model of extra Z
gauge boson, we perform a detailed comparative study on CLFV searches at
several future lepton colliders, including a 240 GeV electron-positron collider
and a TeV scale muon collider. Based on detailed signal and background
Monte-Carlo studies with fast detector simulations, we derive the potentials in
searching for Z mediated CLFV couplings with , and
of different future colliders. The results are compared with the
current limits set by either low-energy experiments or the high-energy LHC
experiments. We find that the sensitivity of the related CLFV coupling
strength at future lepton colliders will be significantly improved comparing
with the current best constraints.Comment: 11 pages, 5 figure
The physics case for a neutrino lepton collider in light of the CDF W mass measurement
We propose a neutrino lepton collider where the neutrino beam is generated
from TeV scale muon decays. Such a device would allow for a precise measurement
of the W mass based on single W production: nu l to W. Although it is
challenging to achieve high instantaneous luminosity with such a collider, we
find that a total luminosity of 0.1/fb can already yield competitive physics
results. In addition to a W mass measurement, a rich variety of physics goals
could be achieved with such a collider, including W boson precision
measurements, heavy leptophilic gauge boson searches, and anomalous Znunu
coupling searches. A neutrino lepton collider is both a novel idea in itself,
and may also be a useful intermediate step, with less muon cooling required,
towards the muon-muon collider already being pursued by the energy frontier
community. A neutrino neutrino or neutrino proton collider may also be
interesting future options for the high energy frontier.Comment: 4 pages, 5 plots, accepted version by IJMP
(Re)interpretation of the LHC results for new physics
The Standard Model Effective Field Theory (SMEFT) provides a model-independent description to the collider events, from which the measured Wilson coefficients can be interpreted with some specific BSM model and vice versa. In the context of SMEFT, operators constructed with odd dimensions may lead to Lepton Number Violation (LNV). In this work, we will present the results of reinterpreting SSWW induced signal searches in same-sign dimuon final state from CMS for constraining dimension 7/9 operators
Tests of neutrino mass models at CMS
The latest results and prospects of searches for heavy neutrinos at the CMS experiment will be presented
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