New physics in $\Delta \Gamma_d$

@article{TetlalmatziXolocotzi2015NewPI,
  title={New physics in \$\Delta \Gamma\_d\$},
  author={Gilberto Tetlalmatzi-Xolocotzi},
  journal={arXiv: High Energy Physics - Phenomenology},
  year={2015}
}
We analyze the possibility of having new physics effects in the decay rate difference, $\Delta \Gamma_d$, of neutral $B_d$ mesons. Three different sources of enhancement are considered, CKM unitarity violations, beyond standard model effects in the tree-level dimension six operators $(\bar{d}p)(\bar{p}'b)$ with $p,p'=u,c$; and large enhancements of the almost unconstrained operators $(\bar{d}b)(\bar{\tau}\tau)$. We find that deviations of several hundred per cent from the standard model… 

Figures from this paper

References

SHOWING 1-8 OF 8 REFERENCES
New physics effects in tree-level decays and the precision in the determination of the quark mixing angle γ
We critically review the assumption that no new physics is acting in tree-level B-meson decays and study the consequences for the ultimate precision in the direct determination of the
Study of CP-violating charge asymmetries of single muons and like-sign dimuons in p(p)over-bar collisions
We measure the inclusive single muon charge asymmetry and the like-sign dimuon charge asymmetry in $p \bar{p}$ collisions using the full data set of 10.4 fb$^{-1}$ collected with the D0 detector at
Understanding the like-sign dimuon charge asymmetry in $p \bar{p}$ collisions
The D0 Collaboration has measured the like-sign dimuon charge asymmetry in $p\overline{p}$ collisions at the Fermilab Tevatron collider. The result is significantly different from the standard model
Measurement of the anomalous like-sign dimuon charge asymmetry with 9 fb(-1) of p(p)over-bar collisions
We present an updated measurement of the anomalous like-sign dimuon charge asymmetry A(sl)(b) for semileptonic b-hadron decays in 9.0 fb(-1) of p (p) over bar collisions recorded with the D0 detector
New Physics in Gamma_12^s: (sbar b) (taubar tau) Operators
Measurements performed at the Tevatron of both the like-sign dimuon charge asymmetry in B_d,s-meson samples and the mixing-induced CP asymmetry in B_s -> J/psi phi depart from their standard model
Numerical updates of lifetimes and mixing parameters of B mesons
We update the Standard-Model predictions for several quantities related to Bs−B¯s and Bd−B¯d mixing. The mass and width differences in the Bs system read ΔMSMs=(17.3±2.6)ps−1 and
Averages of b-hadron, c-hadron, and $$\tau $$τ-lepton properties as of summer 2016
This article reports world averages of measurements of b-hadron, c-hadron, and $$\tau $$τ-lepton properties obtained by the Heavy Flavor Averaging Group using results available through summer 2016.
Evidence for an anomalous like-sign dimuon charge asymmetry.
TLDR
It is shown that like-sign dimuon charge asymmetry in semileptonic b-hadron decays differs by 3.2 standard deviations from the standard model prediction, and provides first evidence of anomalous CP violation in the mixing of neutral B mesons.