Israeli Joint Particle Physics Meetings, Spring-Summer 2020

22 Apr 2020, 11:00 → 30 Jun 2021, 12:00 Asia/Jerusalem

Michael Geller (Technion), Oleksii Matsedonskyi (Weizmann Institute), Yevgeny Kats (Ben-Gurion University), Yonit Hochberg (Hebrew University), Yotam Soreq (CERN)

Meetings in particle physics phenomenology and experiment, organized jointly by Ben-Gurion University, Hebrew University, Technion, Tel Aviv University and Weizmann Institute.

Wednesday 22 April

11:00 → 12:00 Supersoft Stops

The talk will be given remotely:
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https://technion.zoom.us/j/754833484?pwd=dWVjSjNOYWhFYkRSRDVkVzJ1U29sQT09

Meeting ID: 754 833 484
Password: HEP_Joint

Speaker: Matthew Philip Mccullough (CERN)

JointIsrael.pdf

Wednesday 6 May

11:00 → 12:00 Charm Physics Confronts High-$p_T$ Lepton Tails

The talk will be given remotely:
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https://technion.zoom.us/j/99512131810?pwd=dS9Ma0JYTVJzajRuME1Wemo0Y3E5dz09

Meeting ID: 995 1213 1810
Password: HEP_Joint

Speaker: Admir Greljo (CERN)

IJPPM_GreljoAdmir.pdf

Wednesday 13 May

13:00 → 14:00 Optimized CP probes of the top quark Yukawa at hadron colliders

The talk will be given remotely:
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https://technion.zoom.us/j/94720014121?pwd=Vld0NmlINE4xTE5iMkx0SlliOFltdz09

Meeting ID: 947 2001 4121
Password: HEP_Joint

Speaker: Jernej Fesel Kamenik (Jozef Stefan Institute (SI))

kamenik_NPtop.pdf

Wednesday 20 May

11:00 → 12:00 En$t\bar{t}$anglement detection at the LHC

The talk will be given remotely:
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https://technion.zoom.us/j/95323835114?pwd=VlZFQzVNQW54TElQUzFJTFM1OGpvUT09

Meeting ID: 953 2383 5114
Password: HEP_Joint

Speaker: Yoav Afik (Technion- Israel Institute of Technology (IL))

main.pdf

Wednesday 27 May

16:00 → 17:00 Gamma-Ray Tests of Elusive Dark Matter Candidates

The talk will be given remotely:
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https://technion.zoom.us/j/96160656142?pwd=MzlYMUEvVmp0a0RMY2l0RUgyMWFXUT09

Meeting ID: 961 6065 6142
Password: HEP_Joint

Abstract: I will discuss the ability of current and future gamma-ray datasets to constrain dark matter candidates that are otherwise very difficult to probe, focusing on the cases of asteroid-mass primordial black holes and thermal winos and higgsinos. I will present new constraints on the PBH mass and DM fraction from INTEGRAL data, briefly outline recent theoretical progress in computing the expected annihilation signals of winos and higgsinos, and show that the upcoming CTA gamma-ray telescope array should still have sensitivity to the thermal higgsino even once a range of systematic uncertainties are taken into account.

Speaker: Tracy Slatyer

Israel_Joint_Seminar_May2020_Slatyer.pdf

Wednesday 3 June

16:00 → 17:00 Searching for axion light particles using flavor violating transitions

Speaker: Jure Zupan (University of Cincinnati)

Israel_2020_Zupan.pdf

Wednesday 17 June

11:00 → 12:00 Non-Cold Dark Matter from Primordial Black Hole Evaporation

The talk will be given remotely:
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https://technion.zoom.us/j/93346299032?pwd=V2JJdmxqM0JkQzBYN2FVS0F4bldjQT09

Meeting ID: 933 4629 9032
Password: HEP_Joint

Abstract: Dark matter coupled solely gravitationally can be produced through the decay of primordial black holes in the early universe. If the dark matter is lighter than the initial black hole temperature, it can be warm enough to be subject to structure formation constraints. I will present an overview of this scenario and discuss some recent progress in calculating the structure formation constraint with greater precision. Taking into account the red-shifted phase space of DM particles from the black hole evaporation, we used the Boltzmann code CLASS to determine the corresponding matter power spectrum, which we find to match closely to those of warm dark matter models. This allowed us to rule out the possibility, consistent with analytic estimates, of primordial black holes having come to dominate the energy density of the universe and simultaneously given rise to all the DM through their decay. Consequences and implications for dark radiation and leptogenesis will be briefly discussed.

Speaker: Dr Iason Baldes (Universite Libre de Bruxelles)

Wednesday 24 June

15:00 → 16:00 A New Mask for An Old Suspect -- Testing the Sensitivity of the Galactic Center Excess to the Point Source Mask

The talk will be given remotely:

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https://huji.zoom.us/j/98293801426?pwd=T3Bpajk5aytmK0dSOUJrb1phdW4xQT09

Meeting ID: 982 9380 1426
Password: HEP_Joint

Abstract:
The Galactic center excess has lingered as a possible, but ambiguous, signal of new physics for several years. It has previously been argued that certain details of the excess emission imply that it likely originates from a population of point sources, but this remains a topic of vigorous debate. In this talk, I will report on recent work, relying on a new point source catalog (obtained by the Fermi-LAT collaboration), that sheds light on this controversial topic. After giving some background on the excess, I will discuss various metrics that have been used to try to understand its true nature. I will show that the large majority of bright sources that were previously suggested to be members of the excess are indeed contained in the new Fermi-LAT point source catalog -- and yet, despite masking out these sources (so that they cannot contribute to the excess), the excess remains just as bright in our new fit to the data. I will go on to discuss the implications of our findings for the two most popular interpretations of the excess and I will show some preliminary next steps to further clarify the nature of the excess.

Speaker: Samuel McDermott

Wednesday 1 July

11:00 → 12:00 Audible Axions: Probing axion-like particles using gravitational waves

The talk will be given remotely:
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https://technion.zoom.us/j/94690471513?pwd=NXEyeitvaXY5dzYrMExDMnZ1ZXRxUT09

Meeting ID: 946 9047 1513
Password: HEP_Joint

Abstract: Gravitational waves offer a new possibility to probe the early universe. After a brief overview, I will focus on the audible axion scenario, in which dynamics of the axion after inflation leads to an observable GW signal with distinct characteristics.

Speaker: Pedro Schwaller (Argonne National Laboratory/UIC chicago)

Audible_Axions_Israel.pdf

Wednesday 8 July

16:00 → 17:00 KOTO vs NA62

The talk will be given remotely:
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https://technion.zoom.us/j/97286428374?pwd=Z2lyb0RKVjJLNE9PaENBMmxpMytIZz09

Meeting ID: 972 8642 8374
Password: HEP_Joint

Speaker: Kohsaku Tobioka

talk2020@IsraelJoint.pdf

Wednesday 15 July

12:00 → 13:15 ESPP discussion

1. Gilad Perez - brief introduction.
2. Halina Abramowicz - perspective on the output
3. Eliezer Rabinovici - perspective on the process and lessons for the future
4. Halina and Eliezer - addressing questions sent in advance
5. Open discussion

Speakers: Eliezer Rabinovici (The Hebrew University of Jerusalem (IL)), Prof. Gilad Perez (Weizmann), Halina Abramowicz (Tel Aviv University (IL))

Gilad_Perez_ESPP_Jul_20.pdf

HA-Joint-Seminar-IL.pdf

Wednesday 22 July

11:00 → 12:00 More Axions from Strings

The talk will be given remotely:
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https://technion.zoom.us/j/93901756968?pwd=NkRUTnY4N2l4YlFFdXI0aDFDbyswZz09

Meeting ID: 939 0175 6968
Password: HEP_Joint

Abstract: The axion solution to the strong CP problem also provides a natural dark matter candidate. If the PQ symmetry has ever been restored after inflation, topological defects of the axion field would have formed and produced relic axions, whose abundance is in principle calculable. We study the contribution to the abundance produced by string defects during the so-called scaling regime. Clear evidence of scaling violations is found, the most conservative extrapolation of which strongly suggests a large number of axions from strings. The overall result is a lower bound on the QCD axion mass in the post-inflationary scenario that is substantially stronger than the naive one from misalignment.

Speaker: Marco Gorghetto (SISSA)

Axions from Strings.pdf

Wednesday 12 August

16:00 → 17:00 Nonlinear Isotope Shift in Yb$^+$ Search for Physics beyond the Standard Model

The talk will be given remotely:
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https://technion.zoom.us/j/99809009276?pwd=MjVZZ0hoRmFvUThnblQzU29FWUhuUT09

Meeting ID: 998 0900 9276
Passcode: HEP_Joint

Abstract: Recently it has been proposed to search for particles outside the Standard Model (SM) in an intermediate mass range (100 eV to 100 MeV) by means of precision isotope shift spectroscopy on narrow optical transitions. We perform such measurements on two quadrupole $S \to D$ transitions and one octupole $S \to F$ transition for five bosonic isotopes of Yb$^+$ with an accuracy below 1kHz, and observe nonlinearities in the corresponding King plots. Such a nonlinearity can indicate physics beyond the SM, or higher-order effects within the SM. Our data indicate that there are at least two distinct sources of nonlinearity. We identify the second-order field shift as the leading-order effect within the SM for Yb$^+$, and discuss possibilities for the other source of nonlinearity. In the future, more precise measurements on more transition available for Yb$^+$ and Yb, in combination with improved electronic-structure calculations, can be used to distinguish between effects within and outside the SM.

Speaker: Vladan Vuletić (MIT)

2020 Israel Seminar Dark Matter Isotope.pdf