scholarly journals Study on theΥ(1S)→BcMWeak Decays

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Junfeng Sun ◽  
Lili Chen ◽  
Na Wang ◽  
Qin Chang ◽  
Jinshu Huang ◽  
...  
Keyword(s):  
Branching Ratio ◽  
Heavy Flavor ◽  
Matrix Elements ◽  
High Luminosity ◽  
Weak Decays ◽  
The Future

Motivated by the prospects of the potentialΥ(1S)particle at high-luminosity heavy-flavor experiments, we studied theΥ(1S)→BcMweak decays, whereM=π,ρ,K(∗). The nonfactorizable contributions to hadronic matrix elements are taken into consideration with the QCDF approach. It is found that the CKM-favoredΥ(1S)→Bcρdecay has branching ratio ofO(10-10), which might be measured promisingly by the future experiments.

scholarly journals Study of theψ(1S,2S)andηc(1S,2S)Weak Decays intoDM

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Junfeng Sun ◽  
Yueling Yang ◽  
Jinshu Huang ◽  
Lili Chen ◽  
Qin Chang
Keyword(s):  
Branching Ratios ◽  
Light Meson ◽  
Heavy Flavor ◽  
Final States ◽  
Charmed Meson ◽  
Matrix Elements ◽  
High Luminosity ◽  
Factorization Approach ◽  
Weak Decays ◽  
Qcd Factorization

Inspired by the recent measurements on theJ/ψ(1S)→Dsρ,DuK⁎weak decays at BESIII and the potential prospects of charmonium at high-luminosity heavy-flavor experiments, we studyψ(1S,2S)andηc(1S,2S)weak decays into final states including one charmed meson plus one light meson, considering QCD corrections to hadronic matrix elements with QCD factorization approach. It is found that the Cabibbo-favoredψ(1S,2S)→Ds-ρ+,Ds-π+,D¯u0K¯⁎0decays have large branching ratios≳10-10, which might be accessible at future experiments.

scholarly journals J/ψ → DP, DV decays in the QCD factorization approach

2015 ◽  
Vol 30 (16) ◽  
pp. 1550094 ◽  
Author(s):  
Junfeng Sun ◽  
Lili Chen ◽  
Qin Chang ◽  
Jinshu Huang ◽  
Yueling Yang
Keyword(s):  
Branching Ratios ◽  
Radiative Corrections ◽  
Heavy Flavor ◽  
Matrix Elements ◽  
High Luminosity ◽  
Factorization Approach ◽  
Weak Decays ◽  
Qcd Factorization ◽  
Near Future

Motivated by the recent measurements on nonleptonic J/ψ weak decays at BESIII and the potential prospects of J/ψ meson at the high-luminosity heavy-flavor experiments, the branching ratios of the two-body nonleptonic J/ψ → DP, DV decays are estimated quantitatively by considering the QCD radiative corrections to hadronic matrix elements with the QCD factorization approach. It is found that the Cabibbo favored [Formula: see text], [Formula: see text], [Formula: see text] decays have branching ratios ≳ 10-10, which might be promisingly detectable in the near future.

scholarly journals Study of J/ψ → Ds,dV decays with perturbative QCD approach

2016 ◽  
Vol 31 (30) ◽  
pp. 1650161
Author(s):  
Yueling Yang ◽  
Junfeng Sun ◽  
Jie Gao ◽  
Qin Chang ◽  
Jinshu Huang ◽  
...  
Keyword(s):  
Perturbative Qcd ◽  
Branching Ratio ◽  
Weak Decay ◽  
Vector Mesons ◽  
High Luminosity ◽  
Potential Measurement ◽  
Measurement Capability ◽  
Weak Decays ◽  
The Future

Inspired by the recent measurements on two-body nonleptonic [Formula: see text] weak decay at BESIII, the charm-changing [Formula: see text] weak decays are studied with perturbative QCD approach, where [Formula: see text] denotes [Formula: see text] and [Formula: see text] vector mesons. It is found that branching ratio for [Formula: see text] decay can reach up to [Formula: see text], which is within the potential measurement capability of the future high-luminosity experiments.

SEMILEPTONIC WEAK DECAYS OF HEAVY BARYONS

2000 ◽  
Vol 15 (06) ◽  
pp. 821-831
Author(s):  
MANSOUR HAGHIGHAT
Keyword(s):  
Simple Model ◽  
Heavy Quark ◽  
Branching Ratio ◽  
Form Factors ◽  
Matrix Elements ◽  
Weak Decays ◽  
Heavy Baryons ◽  
Heavy Quark Limit

We propose a simple model to describe the semileptonic weak decays among heavy baryons in the heavy quark limit in a unified way. The current matrix elements of the heavy baryons, with spin-0 light diquark, are evaluated to give the ω-dependence of the form factors. The numerical values are also calculated and the branching ratio for [Formula: see text] is consequently obtained in the range (4.9–15.3)%.

scholarly journals Υ(nS) → Bc∗D decays with perturbative QCD approach

2016 ◽  
Vol 31 (26) ◽  
pp. 1650146 ◽  
Author(s):  
Yueling Yang ◽  
Junfeng Sun ◽  
Jinshu Huang ◽  
Haiyan Li ◽  
Gongru Lu ◽  
...  
Keyword(s):  
Perturbative Qcd ◽  
Branching Ratio ◽  
Weak Decays ◽  
The Future

The [Formula: see text] weak decays [Formula: see text] are investigated with perturbative QCD approach. It is found that the CKM-favored [Formula: see text] decays have branching ratio of [Formula: see text], which might be potentially accessible to the future LHC and SuperKEKB experiments.

scholarly journals IUE Studies of Luminous X-Ray Binaries

1983 ◽  
Vol 6 ◽  
pp. 648-648
Author(s):  
J.B. Hutchings
Keyword(s):  
Magellanic Clouds ◽  
Thick Shell ◽  
High Luminosity ◽  
Uv Spectrum ◽  
X Ray ◽  
Unique Object ◽  
The Future ◽  
Orbit Inclination ◽  
Supercritical Accretion ◽  
X Ray Binaries

IUE has been used to study 11 high luminosity X-ray binaries, of which 3 are in the Magellanic Clouds. In the supergiant systems, X-ray ionisation bubbles have been found in most cases, leading to a greater understanding of the winds and accretion processes. Further studies of precessing objects such as LMC X-4 with IUE and ST are clearly of considerable interest, relating to X-ray heating and blanketing. Detailed studies of the Cyg X-l ionisation bubble may resolve the long standing puzzle of its orbit inclination and masses. UV continua have furnished valuable information on extinction, temperatures and luminosities, and the presence of non-stellar (i.e. disk) luminosity. Here too, more detailed studies are clearly indicated for the future. A unique object of interest is the LMC transient 0538-66 whose UV spectrum has quasarlike lines and luminosity which varies oppositely to the visible. This may be a case of supercritical accretion generating an optically thick shell (“disk”) about the pulsar.

Heavy-flavor-conserving nonleptonic weak decays of heavy baryons

1992 ◽  
Vol 46 (11) ◽  
pp. 5060-5068 ◽  
Author(s):  
Hai-Yang Cheng ◽  
Chi-Yee Cheung ◽  
Guey-Lin Lin ◽  
Y. C. Lin ◽  
Tung-Mow Yan ◽  
...  
Keyword(s):  
Heavy Flavor ◽  
Weak Decays ◽  
Heavy Baryons

scholarly journals Heavy-flavor-conserving hadronic weak decays of heavy baryons

2016 ◽  
Vol 2016 (3) ◽  
Author(s):  
Hai-Yang Cheng ◽  
Chi-Yee Cheung ◽  
Guey-Lin Lin ◽  
Yeu-Chung Lin ◽  
Tung-Mow Yan ◽  
...  
Keyword(s):  
Heavy Flavor ◽  
Weak Decays ◽  
Heavy Baryons

scholarly journals Study of nonleptonic B(s)∗→ M1M2 (M = D,Ds,π,K) weak decays with factorization approach

2015 ◽  
Vol 30 (27) ◽  
pp. 1550162 ◽  
Author(s):  
Qin Chang ◽  
Pan-Pan Li ◽  
Xiao-Hui Hu ◽  
Lin Han
Keyword(s):  
Flavor Physics ◽  
Branching Fractions ◽  
Form Factors ◽  
Approximation Formula ◽  
Heavy Flavor ◽  
Transition Form ◽  
Factorization Approach ◽  
Decay Modes ◽  
Weak Decays ◽  
Belle Ii

Motivated by the experiments of heavy flavor physics at running LHC and upgrading SuperKEKB/Belle-II in the future, the nonleptonic [Formula: see text] [Formula: see text] weak decays are studied in this paper. The amplitudes are calculated with factorization approach, and the transition form factors [Formula: see text] are evaluated within BSW model. With the reasonable approximation [Formula: see text], our predictions of branching fractions are presented. Numerically, the CKM-favored tree-dominated [Formula: see text] and [Formula: see text] decays have the largest branching fractions of the order [Formula: see text], and hence will be firstly observed by forthcoming Belle-II experiment. However, most of the other decay modes have the branching fractions [Formula: see text] and thus are hardly to be observed soon. Besides, for the possible detectable [Formula: see text] decays with branching fractions [Formula: see text], some useful ratios, such as [Formula: see text], etc. are presented and discussed in detail.

Improved HOM-mitigation for future SPS 33-Cell 200 MHz traveling-wave accelerating structures

2019 ◽  
Vol 34 (36) ◽  
pp. 1942018
Author(s):  
P. Kramer ◽  
C. Vollinger
Keyword(s):  
Traveling Wave ◽  
Higher Order ◽  
High Luminosity ◽  
Basic Principles ◽  
Higher Order Modes ◽  
Cell Structures ◽  
The Future ◽  
Em Field

The CERN SPS 200 MHz traveling-wave (TW) accelerating structures pose an intensity limitation for the planned High Luminosity (HL-) LHC upgrade. Higher-order modes (HOMs) around 630 MHz have been identified as one of the main sources of longitudinal multi-bunch instabilities. Improved mitigation of these HOMs with respect to today’s HOM-damping scheme is therefore an essential part of the LHC injectors upgrade (LIU) project. The basic principles of HOM-couplers in cavities and today’s damping scheme are reviewed. Before illustrating the numerous requirements, an improved damping scheme for the future 33-cell structures must be fulfilled. These are, among others, the mitigation of HOMs situated in the lower part of the structure where there are no access ports for extraction, a sufficient overall damping performance and an acceptable influence on the fundamental accelerating passband (FPB). Different approaches tackling these challenges are investigated and their performance, advantages and pitfalls are evaluated by ACE3P and CST electromagnetic (EM) field solver suites.

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