scholarly journals New physics search in flavour physics

2006 ◽  
Vol 156 (1) ◽  
pp. 195-202 ◽  
Author(s):  
Tobias Hurth
2013 ◽  
Vol 868 (2) ◽  
pp. 368-382 ◽  
Author(s):  
Damir Bečirević ◽  
Andrey Tayduganov

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Minoru Tanaka ◽  
Yasuhiro Yamamoto

Abstract Isotope shift of atomic spectra is considered as a probe of new interaction between electrons and neutrons in atoms. We employ the method of seeking a breakdown of King’s linearity in the isotope shifts of two atomic transitions. In the present work, we evaluate the magnitudes of the nonlinearity using relativistic wave functions and the result is compared with that of nonrelativistic wave functions from our previous work. It turns out that the nonrelativistic calculation underestimates the nonlinearity owing to the new interaction in the mass range of the mediator greater than 1 MeV. Further, we find that the nonlinearity within the standard model of particle physics is significantly magnified by the relativistic effect in the $\text{p}_{1/2}$ state. To get rid of this obstacle in the new physics search, we suggest avoiding $\text{p}_{1/2}$ and that e.g. $\text{p}_{3/2}$ should be used instead.


2018 ◽  
Vol 179 ◽  
pp. 01015 ◽  
Author(s):  
Dario Müller

While the LHC has not directly observed any new particle so far, experimental results from LHCb, BELLE and BABAR point towards the violation of lepton flavour universality in b ⟶ sℓ+ and b ⟶ c-ℓν. In this context, also the discrepancy in the anomalous magnetic moment of the muon can be interpreted as a sign of lepton flavour universality violation. Here we discuss how these hints for new physics can also be explained by introducing leptoquarks as an extension of the Standard Model. Indeed, leptoquarks are good candidates to explain the anomaly in the anomalous magnetic moment of the muon because of an mg/mμ enhanced contribution giving correlated effects in Z boson decays which is particularly interesting in the light of future precision experiments.


2010 ◽  
Author(s):  
Hye-Sung Lee ◽  
George Alverson ◽  
Pran Nath ◽  
Brent Nelson

2006 ◽  
Vol 157 (1) ◽  
pp. 246-250 ◽  
Author(s):  
Bohdan Grzadkowski ◽  
Zenrō Hioki ◽  
Kazumasa Ohkuma ◽  
José Wudka

2012 ◽  
Vol 27 (32) ◽  
pp. 1250188 ◽  
Author(s):  
ARGHYA CHOUDHURY ◽  
AMITAVA DATTA

Using the ATLAS 4.7 fb-1 data on new physics search in the jets + [Formula: see text] channel, we obtain new limits on the lighter top squark [Formula: see text] considering all its decay modes assuming that it is the next to lightest supersymmetric particle (NLSP). If the decay [Formula: see text] dominates and the production of dark matter relic density is due to NLSP–lightest supersymmetric particle (LSP) co-annihilation then the lower limit on [Formula: see text] is 240 GeV. The limit changes to 200 GeV if the decay [Formula: see text] dominates. Combining these results it follows that [Formula: see text] NLSP induced baryogenesis is now constrained more tightly.


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