4,459 research outputs found
Transitions in the Standard Model Effective Field Theory
The anomalies observed in decays
have attracted much attention in recent years. In this paper, we study the
, , , , and decays, all
being mediated by the same quark-level transition, in the
Standard Model Effective Field Theory. The most relevant dimension-six
operators for these processes are , , ,
and in the Warsaw basis. Evolution of the corresponding Wilson
coefficients from the new physics scale ~TeV down to the
characteristic scale is performed at three-loop in QCD and
one-loop in EW/QED. It is found that, after taking into account the constraint
, a single
or
can still be used to resolve the
anomalies at , while a single
is already ruled out by the
measured at more than . By minimizing the
function constructed based on the current data on ,
, , , and , we obtain eleven most
trustworthy scenarios, each of which can provide a good explanation of the
anomalies at . To further discriminate these different
scenarios, we predict thirty-one observables associated with the processes
considered under each NP scenario. It is found that most of the scenarios can
be differentiated from each other by using these observables and their
correlations.Comment: 43 pages, 3 figures and 5 tables; references updated and more
discussions added, final version to be published in the journa
Revisiting the -physics anomalies in -parity violating MSSM
In recent years, several deviations from the Standard Model predictions in
semileptonic decays of -meson might suggest the existence of new physics
which would break the lepton-flavour universality. In this work, we have
explored the possibility of using muon sneutrinos and right-handed sbottoms to
solve these -physics anomalies simultaneously in -parity violating
minimal supersymmetric standard model. We find that the photonic penguin
induced by exchanging sneutrino can provide sizable lepton flavour universal
contribution due to the existence of logarithmic enhancement for the first
time. This prompts us to use the two-parameter scenario to explain anomaly. Finally, the
numerical analyses show that the muon sneutrinos and right-handed sbottoms can
explain and anomalies simultaneously,
and satisfy the constraints of other related processes, such as decays, mixing, decays, as well as
, , , , , , and decays.Comment: 10 pages, 8 figures, matches to the version published in EPJ
Efficient Multimodal Fusion via Interactive Prompting
Large-scale pre-training has brought unimodal fields such as computer vision
and natural language processing to a new era. Following this trend, the size of
multi-modal learning models constantly increases, leading to an urgent need to
reduce the massive computational cost of finetuning these models for downstream
tasks. In this paper, we propose an efficient and flexible multimodal fusion
method, namely PMF, tailored for fusing unimodally pre-trained transformers.
Specifically, we first present a modular multimodal fusion framework that
exhibits high flexibility and facilitates mutual interactions among different
modalities. In addition, we disentangle vanilla prompts into three types in
order to learn different optimizing objectives for multimodal learning. It is
also worth noting that we propose to add prompt vectors only on the deep layers
of the unimodal transformers, thus significantly reducing the training memory
usage. Experiment results show that our proposed method achieves comparable
performance to several other multimodal finetuning methods with less than 3%
trainable parameters and up to 66% saving of training memory usage.Comment: Camera-ready version for CVPR202
Action Sensitivity Learning for the Ego4D Episodic Memory Challenge 2023
This report presents ReLER submission to two tracks in the Ego4D Episodic
Memory Benchmark in CVPR 2023, including Natural Language Queries and Moment
Queries. This solution inherits from our proposed Action Sensitivity Learning
framework (ASL) to better capture discrepant information of frames. Further, we
incorporate a series of stronger video features and fusion strategies. Our
method achieves an average mAP of 29.34, ranking 1st in Moment Queries
Challenge, and garners 19.79 mean R1, ranking 2nd in Natural Language Queries
Challenge. Our code will be released.Comment: Accepted to CVPR 2023 Ego4D Workshop; 1st in Ego4D Moment Queries
Challenge; 2nd in Ego4D Natural Language Queries Challeng
Action Sensitivity Learning for Temporal Action Localization
Temporal action localization (TAL), which involves recognizing and locating
action instances, is a challenging task in video understanding. Most existing
approaches directly predict action classes and regress offsets to boundaries,
while overlooking the discrepant importance of each frame. In this paper, we
propose an Action Sensitivity Learning framework (ASL) to tackle this task,
which aims to assess the value of each frame and then leverage the generated
action sensitivity to recalibrate the training procedure. We first introduce a
lightweight Action Sensitivity Evaluator to learn the action sensitivity at the
class level and instance level, respectively. The outputs of the two branches
are combined to reweight the gradient of the two sub-tasks. Moreover, based on
the action sensitivity of each frame, we design an Action Sensitive Contrastive
Loss to enhance features, where the action-aware frames are sampled as positive
pairs to push away the action-irrelevant frames. The extensive studies on
various action localization benchmarks (i.e., MultiThumos, Charades,
Ego4D-Moment Queries v1.0, Epic-Kitchens 100, Thumos14 and ActivityNet1.3) show
that ASL surpasses the state-of-the-art in terms of average-mAP under multiple
types of scenarios, e.g., single-labeled, densely-labeled and egocentric.Comment: Accepted to ICCV 202
Light-LOAM: A Lightweight LiDAR Odometry and Mapping based on Graph-Matching
Simultaneous Localization and Mapping (SLAM) plays an important role in robot
autonomy. Reliability and efficiency are the two most valued features for
applying SLAM in robot applications. In this paper, we consider achieving a
reliable LiDAR-based SLAM function in computation-limited platforms, such as
quadrotor UAVs based on graph-based point cloud association. First, contrary to
most works selecting salient features for point cloud registration, we propose
a non-conspicuous feature selection strategy for reliability and robustness
purposes. Then a two-stage correspondence selection method is used to register
the point cloud, which includes a KD-tree-based coarse matching followed by a
graph-based matching method that uses geometric consistency to vote out
incorrect correspondences. Additionally, we propose an odometry approach where
the weight optimizations are guided by vote results from the aforementioned
geometric consistency graph. In this way, the optimization of LiDAR odometry
rapidly converges and evaluates a fairly accurate transformation resulting in
the back-end module efficiently finishing the mapping task. Finally, we
evaluate our proposed framework on the KITTI odometry dataset and real-world
environments. Experiments show that our SLAM system achieves a comparative
level or higher level of accuracy with more balanced computation efficiency
compared with the mainstream LiDAR-based SLAM solutions
- …