PIKIMO 11

Contribution List

6. Exploring the phenomenology of weak adjoint scalars in minimal R-symmetric models

Matthew Smylie

04/12/2021, 10:00

We examine the phenomenology of the scalar fields in weak and Higgs sectors of minimal R-symmetric models, in particular the 'swino' and 'sbino', the scalar partners to the chiral fields that marry the electroweak gauge bosons in Dirac gaugino models. These fields are in adjoint representations of SU(2) and U(1) and have both CP-even and CP-odd components. The interactions of these new states...

11. Two-loop Electroweak Corrections to the Top-Quark Contribution to $\epsilon_K$

Dr Sandra Kvedaraite (University of Cincinnati)

04/12/2021, 10:15

The parameter $\epsilon_K$ measures $CP$ violation in the neutral kaon
system. It is a sensitive probe of new physics and plays a prominent
role in the global fit of the Cabibbo-Kobabyashi-Maskawa matrix. The
perturbative theory uncertainty is currently dominated by the
top-quark contribution. In this talk I will present the calculation of the full
two-loop electroweak corrections to the...

12. Multi-Boson Production and the Muon Yukawa Coupling

Yang Ma (University of Pittsburgh)

04/12/2021, 10:30

The Higgs boson may be regarded as, on the one hand, the capstone of the glorious arch of the SM or, on the other hand, as the portal giving access to new physics. An open question in particle physics is whether the Higgs mechanism generates the masses of all the fermions by the Yukawa interactions. We propose to study multi-boson production processes and scrutinize the muon Yukawa coupling at...

5. Azimuthal Angular Correlation as a Boosted Top Jet Substructure

Zhite Yu

04/12/2021, 10:45

We propose a novel jet substructure observable of boosted tops that is related to the linear polarization of the W boson in top quark decay, which results in a cos 2φ angular correlation between the t → bW and W → ff′ decay planes. The degree of this angular correlation can be used to measure the longitudinal polarization of top quark, which is an important probe of new physics that couples to...

14. Evolution of AI approaches at the LHC

Philip Coleman Harris (Massachusetts Inst. of Technology (US))

04/12/2021, 11:30

In this talk, we will review recent deep learning strategies, and talk about the progression of deep learning embeddings of data. We then follow with this by talking about recent work on supervised and weak supervised learning approaches and how they can play an integral role in next generation physics searches. Finally, we will comment briefly on recent experimental trends at the LHC, and how...

16. Nanosecond machine learning event classification with boosted decision trees in FPGA for high energy physics

Tae Min Hong (University of Pittsburgh (US))

04/12/2021, 12:15

A novel implementation of boosted decision trees on FPGA is presented as a case study for use in a real-time trigger system at the LHC and HL-LHC. An example case of vector boson fusion production of the Higgs boson followed by its hypothetical decay into invisible or soft final states is considered. Comparison of hardware performance is made with respect to hls4ml's boosted decision trees as...

15. Kaleidoscope of axion models and probes

JiJi Fan (Brown University)

04/12/2021, 14:00

Axions, periodic pseudo-scalars, enjoy a wide range of phenomenological applications, from solving the strong CP problem to providing DM and inflaton candidates. Justifiably, they have been the subject of prolonged theoretical interest, which has intensified over the past few years. In this talk, I will discuss several fun developments in axion models and probes, including: a recently...

3. Precision Calculation of Inflation Correlators at One Loop

Yiming Zhong (University of Chicago)

04/12/2021, 14:45

We initiate a systematic study of precision calculation of the inflation correlators at the 1-loop level, starting in this paper with bosonic 1-loop bispectrum with chemical-potential enhancement. Such 1-loop processes could lead to important cosmological collider observables but are notoriously difficult to compute due to the lack of symmetries. We attack the problem from a direct numerical...

8. Hidden Naturalness in the Light of Precision Cosmological Data

Saurabh Bansal (University of Notre Dame)

04/12/2021, 15:00

Hidden naturalness offers an exciting framework for alleviating the Higgs hierarchy problem. However, since the models within this framework face few constraints from collider searches, there is strong motivation to study their cosmological signatures, an area that has remained mostly unexplored. One of the simplest models that can be studied in this framework is the mirror twin Higgs (MTH)...

10. Free-streaming and Coupled Dark Radiation Isocurvature Perturbations: Constraints and Application to the Hubble Tension

Mr Subhajit Ghosh (University of Notre Dame)

04/12/2021, 15:15

Dark radiation (DR) appears as a new physics candidate in various scenarios beyond the Standard Model. While it is often assumed that perturbations in DR are adiabatic, they can easily have an isocurvature component if more than one field was present during inflation, and whose decay products did not all thermalize with each other. In this talk, I will discuss the constraints on both...

13. Windchime: Gravitational Detection of Dark Matter with Mechanical Sensors

Evan Weisman

04/12/2021, 15:30

The Windchime experiment endeavors to directly detect dark matter through its gravitational interaction alone. Current direct dark matter searches rely on the possibility of much stronger non-gravitational interactions of dark matter with ordinary matter. However, dark matter is only guaranteed to interact gravitationally. At a well-motivated mass range of 10^19 GeV, it is conceivable to...

2. Directional dark matter detection in diamond: principles and experimental progress

Reza Ebadi

04/12/2021, 16:15

The next generation of weakly interacting massive particle (WIMP) dark matter (DM) detectors will be sensitive to coherent scattering of solar neutrinos from target nuclei, demanding an efficient background-signal discrimination tool. Thanks to relative motion of the Solar System and Galactic DM halo, fluxes of solar neutrinos and DM particles have distinct anisotropic flux distributions. A...

7. Searching for heavy dark matter in direct detection experiments

Shengchao Li (Purdue University)

04/12/2021, 16:30

Parameter space near the Planck mass (~10$^{19}$GeV/c$^2$) remains relatively unexplored, while many interesting heavy particle dark matter models exist. Multiply-interacting massive particles (MIMPs) are heavy dark matter particles that interact heavily with regular matter but may have evaded detection due to the low number density required to make up the local dark matter halo. These...

9. Indirect Detection of Secluded Supersymmetric Dark Matter

Patrick Barnes (University of Michigan)

04/12/2021, 16:45

Weak-scale secluded sector dark matter can reproduce the observed dark matter relic density with thermal freeze-out within that sector. If nature is supersymmetric, three portals to the visible sector - a gauge portal, a Higgs portal, and a gaugino portal - are present. We present gamma ray spectra relevant for indirect detection of dark matter annihilation in such setups. Since symmetries in...

4. Higgs boson pair production at NNLO in the large-m_t expansion

Florian Herren (Fermilab)

04/12/2021, 17:00

In this talk we present the impact of top quark--mass suppressed terms on the
real-virtual and real-real NNLO corrections to the total partonic production cross section of a pair of Higgs bosons in gluon fusion.

1. Thermal Misalignement for Scalar Dark Mtter

Akshay Ghalsasi (University of Pittsburgh)

The conventional misalignment mechanism for scalar dark matter depends on the initial field value, which governs the oscillation amplitude and present-day abundance. We present a mechanism by which a feeble (Planck-suppressed) coupling of dark matter to a fermion in thermal equilibrium drives the scalar towards its high-temperature potential minimum at large field values, dynamically...