Initial charm program on direct measurements of weak decay constant fDs and branching fraction B(Ds → μνμ) and prospect with high-precision

2020 ◽  
Vol 35 (35) ◽  
pp. 2030018
Author(s):  
C. C. Zhang
Keyword(s):  
High Precision ◽  
Decay Constant ◽  
Branching Fraction ◽  
Branching Fractions ◽  
Weak Decay ◽  
Precision Measurements ◽  
Direct Measurements

First direct measurements of the weak decay constant [Formula: see text] and the [Formula: see text] branching fractions to [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] at the BES experiments in 1990s are reviewed. Referring to the BESIII results of [Formula: see text] and branching fraction [Formula: see text] with best precision1 to date, prospect for challenge on precision measurements of [Formula: see text] and [Formula: see text] at BESIII is presented.

The branching fraction calculations of Bc+ → ψ(2S)π+, Bc+ → J/ψK+ and Bc+ → J/ψDs+ decays relative to that of the Bc+ → J/ψπ+ mode

2018 ◽  
Vol 33 (08) ◽  
pp. 1850044
Author(s):  
Behnam Mohammadi
Keyword(s):  
Branching Fraction ◽  
Branching Fractions ◽  
Decay Amplitude ◽  
Weak Decay ◽  
Lhcb Collaboration ◽  
Tree Level ◽  
Final State ◽  
Factorization Approximation ◽  
Weak Annihilation ◽  
First Time

The weak decay of [Formula: see text] into [Formula: see text], [Formula: see text] and [Formula: see text] mesons, observed by LHCb collaboration for the first time, are calculated in the model which takes into account the “factorizable” contributions and “nonfactorizable” corrections. The decays of [Formula: see text] mesons into charmonia and light hadrons are expected to be well described by the factorization approximation. In the standard model, [Formula: see text], [Formula: see text] decays occur through only the tree-level diagrams and so there are no CP violation in these channels. The decay [Formula: see text] is expected to proceed mainly via a [Formula: see text] transition because the [Formula: see text] decay has identical final state and similar event topology, where it is chosen as the relative branching fraction channel. The ratio of branching fractions [Formula: see text] is of particular interest since the CKM matrix element is suppressed by a factor [Formula: see text], in which the [Formula: see text] occur through [Formula: see text] transition, but the dominant amplitude of the decay [Formula: see text] is a [Formula: see text] transition. The decay [Formula: see text] is examined by color-allowed, color-suppressed spectator and weak annihilation diagrams. The weak annihilation topology, in contrast to decays of other beauty hadrons, is not suppressed and can contribute significantly to the decay amplitude. Because of the [Formula: see text], [Formula: see text] and [Formula: see text] branching fractions are calculated relative to the [Formula: see text] decay, this decay mode is estimated separately, the ratio between them are [Formula: see text], [Formula: see text] and [Formula: see text], respectively, that are compatible with the experimental data.

Prospects for high precision measurements on muonic atoms at the front end of a muon collider

1998 ◽  
Author(s):  
D. Kawall ◽  
M. G. Boshier ◽  
V. W. Hughes ◽  
K. Jungmann ◽  
W. Liu ◽  
...  
Keyword(s):  
High Precision ◽  
Precision Measurements ◽  
Muonic Atoms ◽  
Front End ◽  
Muon Collider

Cold atom interferometry for inertial sensing in the field

2020 ◽  
Vol 9 (5) ◽  
pp. 221-225
Author(s):  
Ravi Kumar ◽  
Ana Rakonjac
Keyword(s):  
High Precision ◽  
Cold Atoms ◽  
Cold Atom ◽  
Atom Interferometry ◽  
Precision Measurements ◽  
Inertial Sensing ◽  
Fundamental Physics ◽  
Recent Developments ◽  
Resource Exploration ◽  
Atom Interferometers

AbstractAtom interferometry is one of the most promising technologies for high precision measurements. It has the potential to revolutionise many different sectors, such as navigation and positioning, resource exploration, geophysical studies, and fundamental physics. After decades of research in the field of cold atoms, the technology has reached a stage where commercialisation of cold atom interferometers has become possible. This article describes recent developments, challenges, and prospects for quantum sensors for inertial sensing based on cold atom interferometry techniques.

Analytical Developments for High-Precision Measurements of W Isotopes in Iron Meteorites

2007 ◽  
Vol 79 (8) ◽  
pp. 3148-3154 ◽  
Author(s):  
Liping Qin ◽  
Nicolas Dauphas ◽  
Philip E. Janney ◽  
Meenakshi Wadhwa
Keyword(s):  
High Precision ◽  
Precision Measurements ◽  
Iron Meteorites

High-Precision Measurements of Lower Atmospheric Temperature Based on Pure Rotational Raman Lidar

2015 ◽  
Vol 58 (4) ◽  
pp. 313-324 ◽  
Author(s):  
LI Ya-Juan ◽  
SONG Sha-Lei ◽  
LI Fa-Quan ◽  
CHENG Xue-Wu ◽  
CHEN Zhen-Wei ◽  
...  
Keyword(s):  
High Precision ◽  
Atmospheric Temperature ◽  
Precision Measurements ◽  
Raman Lidar
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