3,276 research outputs found
Investigating the spectroscopy behavior of undetected -wave charmed baryons
In this work, we investigate the spectroscopic properties of -wave
charmed baryons, which have not yet been observed in experiments. We employ a
non-relativistic potential model and utilize the Gaussian expansion method to
obtain the mass spectra of these charmed baryons. Additionally, we focus on the
two-body Okubo-Zweig-Iizuka allowed strong decay behaviors, which plays a
crucial role in characterizing the properties of these baryons. Our
comprehensive analyses of the mass spectra and two-body Okubo-Zweig-Iizuka
allowed decay behaviors provides valuable insights for future experimental
investigations. This study significantly contributes to our understandings of
the spectroscopic properties of -wave charmed baryons.Comment: 10 pages, 2 figures, 9 tables. More references added. Accepted by
Phys. Rev.
The newly observed : A good candidate for a -wave charmed baryon
The newly observed gives us a good chance to construct the
charmed baryon family. In this work, we carry out the mass spectrum
analysis by a non-relativistic potential model using Gaussian Expansion Method,
and the study of its two-body Okubo-Zweig-Iizuka allowed strong decay behavior.
Our results imply that the is good candidate of
state with . We also predict the spectroscopy behavior of other
states, which may provide further clues to their search.Comment: 6 pages, 4 tables, 3 figures. Accepted by PR
A new scoring function for top-down spectral deconvolution
BACKGROUND: Top-down mass spectrometry plays an important role in intact protein identification and characterization. Top-down mass spectra are more complex than bottom-up mass spectra because they often contain many isotopomer envelopes from highly charged ions, which may overlap with one another. As a result, spectral deconvolution, which converts a complex top-down mass spectrum into a monoisotopic mass list, is a key step in top-down spectral interpretation.
RESULTS: In this paper, we propose a new scoring function, L-score, for evaluating isotopomer envelopes. By combining L-score with MS-Deconv, a new software tool, MS-Deconv+, was developed for top-down spectral deconvolution. Experimental results showed that MS-Deconv+ outperformed existing software tools in top-down spectral deconvolution.
CONCLUSIONS: L-score shows high discriminative ability in identification of isotopomer envelopes. Using L-score, MS-Deconv+ reports many correct monoisotopic masses missed by other software tools, which are valuable for proteoform identification and characterization
Charged lepton flavor violating Higgs decays at future colliders
After the discovery of the Higgs boson, several future experiments have been
proposed to study the Higgs boson properties, including two circular lepton
colliders, the CEPC and the FCC-ee, and one linear lepton collider, the ILC. We
evaluate the precision reach of these colliders in measuring the branching
ratios of the charged lepton flavor violating Higgs decays ,
and . The expected upper bounds on the
branching ratios given by the circular (linear) colliders are found to be
, and at 95\% CL, which are improved by
one to two orders compared to the current experimental bounds. We also discuss
the constraints that these upper bounds set on certain theory parameters,
including the charged lepton flavor violating Higgs couplings, the
corresponding parameters in the type-III 2HDM, and the new physics cut-off
scales in the SMEFT, in RS models and in models with heavy neutrinos.Comment: 20 pages, 2 figures (extend the CEPC study to the FCC-ee and the ILC,
and to match the published version
Systematic Evaluation of Protein Sequence Filtering Algorithms for Proteoform Identification Using Top-Down Mass Spectrometry
Complex proteoforms contain various primary structural alterations resulting from variations in genes, RNA, and proteins. Top-down mass spectrometry is commonly used for analyzing complex proteoforms because it provides whole sequence information of the proteoforms. Proteoform identification by top-down mass spectral database search is a challenging computational problem because the types and/or locations of some alterations in target proteoforms are in general unknown. Although spectral alignment and mass graph alignment algorithms have been proposed for identifying proteoforms with unknown alterations, they are extremely slow to align millions of spectra against tens of thousands of protein sequences in high throughput proteome level analyses. Many software tools in this area combine efficient protein sequence filtering algorithms and spectral alignment algorithms to speed up database search. As a result, the performance of these tools heavily relies on the sensitivity and efficiency of their filtering algorithms. Here, we propose two efficient approximate spectrum-based filtering algorithms for proteoform identification. We evaluated the performances of the proposed algorithms and four existing ones on simulated and real top-down mass spectrometry data sets. Experiments showed that the proposed algorithms outperformed the existing ones for complex proteoform identification. In addition, combining the proposed filtering algorithms and mass graph alignment algorithms identified many proteoforms missed by ProSightPC in proteome-level proteoform analyses
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