Ultraviolet divergences of flavor changing amplitudes in the littlest Higgs model with T-parity

Flavor changing neutral current processes are studied in the littlest Higgs model with T-parity. It is found that the logarithmic divergence reported earlier in Z boson flavor changing processes is exactly canceled by contributions from additional interaction terms of heavy fermions and the Z boson. Phenomenological impact on the K --> pi nu nu_bar processes is discussed.Comment: 14 pages, 3 figure

Artforms Embodied: A Collaborative Fashion Exhibition of the Visual Arts

Undergraduate Creative and Artisti

Non-minimally flavour violating dark matter

Flavour symmetries provide an appealing mechanism to stabilize the dark matter particle. I present a simple model of quark flavoured dark matter that goes beyond the framework of minimal flavour violation. I discuss the phenomenological implications for direct and indirect dark matter detection experiments, high energy collider searches as well as flavour violating precision data.Comment: Proceedings for DISCRETE 2014: Fourth Symposium on Prospects in the Physics of Discrete Symmetries, 2-6 December 2014, King's College Londo

Quo vadis flavour physics? - FPCP2017 theory summary and outlook

We review the recent highlights of theoretical flavour physics, based on the theory summary talk given at FPCP2017. Over the past years, a number of intriguing anomalies have emerged in flavour violating $K$ and $B$ meson decays, constituting some of the most promising hints for the presence of physics beyond the Standard Model. We discuss the theory status of these anomalies and outline possible future directions to test the underlying New Physics.Comment: 15 pages, 4 figures. Proceedings for FPCP2017, 5-9 June 2017, Prague. v2: references added, final version to appear in Po

Wearable Artwork & The Design Process

Undergraduate Creative and Artisti

Introduction to Flavour Physics and CP Violation

These lecture notes provide an introduction to the theoretical concepts of flavour physics and CP violation, based on a series of lectures given at the ESHEP 2016 summer school. In the first lecture we review the basics of flavour and CP violation in the Standard Model. The second lecture is dedicated to the phenomenology of K and B meson decays, where we focus on a few representative observables. In the third lecture we give an introduction to flavour physics beyond the Standard Model, both within the framework of Minimal Flavour Violation and beyond.Comment: 30 pages, 10 figures. v2: Few references added. Lectures given at the ESHEP 2016 summer school in Skeikampen, Norway, 15-28 June 2016. To be published as CERN Yellow Repor

CP Violation in D0 - anti-D0 Oscillations: General Considerations and Applications to the Littlest Higgs Model with T-Parity

The observed D0 - anti-D0 oscillations provide a new stage in our search for New Physics in heavy flavour dynamics. The theoretical verdict on the observed values of x_D and y_D remains ambiguous: while they could be totally generated by Standard Model dynamics, they could also contain a sizable or even leading contribution from New Physics. Those oscillations are likely to enhance the observability of CP violation as clear manifestations of New Physics. We present general formulae for D0 - anti-D0 oscillations, concentrating on the case of negligible direct CP violation. In particular we derive a general formula for the time-dependent mixing-induced CP asymmetry in decays to a CP eigenstate and its correlation with the semileptonic CP asymmetry a_SL(D0) in D0(t) -> l nu K. We apply our formalism to the Littlest Higgs model with T-parity, using the time-dependent CP asymmetry in D -> K_S phi as an example. We find observable effects at a level well beyond anything possible with CKM dynamics. Comparisons with CP violation in the K and B systems offer an excellent test of this scenario and reveal the specific pattern of flavour and CP violation in the D0 - anti-D0 system predicted by this model. We discuss a number of charm decays that could potentially offer an insight in the dynamics of CP violation in D decays. We also apply our formalism to B_s - anti-B_s mixing.Comment: 26 pages, 9 png figures, 1 table. v2: eq. (A.1) corrected, minor clarifying comments and few references added. v3: typos corrected, matches published versio

New Physics Signatures in Kaon Decays

Kaon physics provides a unique opportunity to identify new flavour and CP violating interactions beyond the Standard Model (SM). In the SM, implied by the hierarchical structure of the CKM matrix and the GIM mechanism, flavour changing neutral current processes are most strongly suppressed in the kaon sector while the suppression is much less effective in the B meson systems. Thus their theoretical cleanness makes rare K decays, in particular the K -> pi nu anti-nu system, extremely well suited to look for deviations from their tiny SM values. Despite the increasingly stringent constraints on new physics from direct search experiments as well as indirect searches in B meson decays, large enhancements of both K^+ -> pi^+ nu anti-nu and K_L -> pi^0 nu anti-nu are still possible, and deviations from the SM could be observed even for a multi-TeV new physics scale. In addition the correlation betweeen the charged and neutral K -> pi nu anti-nu modes provides insight on the new physics operator structure in K^0 - anti-K^0 mixing and its interplay with rare K decays. Useful model-discriminating correlations exist also in the K_L -> pi^0 l^+ l^- system. Finally the K -> l nu decays provide a clean test of lepton universality and place constraints on new physics complementary to the ones obtained from the searches for charged lepton flavour violating decays.Comment: 10 pages, 7 figures. Proceedings for KAON13 - 2013 Kaon Physics International Conference at the University of Michigan, Ann Arbor, April 29-May 1 201