INPA

VIRTUAL INPA SEMINAR – Eric Charles (Stanford) - Friday, May 22, 2020
2020-05-22 12:00 - 13:00 (America/Los_Angeles)
Speaker: Eric Charles (Stanford)

Title: Indirect Dark Matter Detection: Status and Summary of WIMP Searches

Abstract:
The nature of dark matter is a longstanding enigma of physics; it may consist of particles beyond the Standard Model that are still elusive to experiments. Searches for signals from the annihilation or decay of weakly interacting massive particle (WMIP) dark matter using observations of the gamma-ray sky have come to prominence over the last decade. Current and upcoming telescopes such as the Fermi Large Area Telescope (Fermi-LAT) and the Cerenkov Telescope Array are particularly well suited for searching for products of the interactions of dark matter particles. In this talk I will describe astrophysical targets studied for evidence of dark matter, and review the status of these searches. I will also discuss the factors that determine the sensitivities of these searches, including the magnitudes of the signals and the relevant backgrounds, considering both statistical and systematic uncertainties. Finally, I will discuss how upcoming observatories operating across the electromagnetic spectrum could change this field.

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https://lbnl.zoom.us/j/91138499248
Meeting ID: 911 3849 9248

VIRTUAL INPA SEMINAR - Chia-Cheng Chang (LBNL)
2020-05-15 12:00 - 13:00
Speaker: Chia-Cheng Chang (LBNL)
Title: Time evolution of open quantum many-body systems
Abstract:
The increasing interest and efforts put forth towards the development of quantum computing have lead to a shift in how one goes about tackling problems that are typically thought of as difficult. In this talk I will discuss a specific paradigm of quantum computing called adiabatic quantum computing, and narrow the scope to discuss what is known as quantum annealing. In particular, the first part of the talk will be devoted to discussing what quantum annealing is, and its connection with adiabatic quantum computing. I will follow by discussing the scope of problems that quantum annealers can hope to solve, include an example for tackling integer linear programming. I will end by discussing our simulation of an open quantum many-body system and compare against experimental results obtained from a DWave quantum annealer. On the DWave, we employ a modified time evolution schedule and observe an improvement in performance. Results from the simulation provide a possible explanation of the underlying physics by correlating algorithmic improvements to the interplay between quantum decoherence and many-body localization..
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https://lbnl.zoom.us/j/99612217893
Meeting ID: 996 1221 7893

VIRTUAL INPA SEMINAR - Zachary Marshall (LBNL)
2020-05-08 12:00 - 13:00
Speaker: Zachary Marshall (LBNL)
Title: Unidentified New Physics: LHC Searches for SUSY and Dark Matter
Abstract:
ATLAS and CMS, two large, general-purpose experiments at the Large Hadron Collider at CERN, have a rich program of searches for new physics. This seminar will take a look at some of the most interesting and difficult searches for Supersymmetry and Dark Matter performed to date. Along the way, there will be some discussion of the difficulties in comparing LHC search results to non-collider search results, and a look into some of the computing challenges that the experiments will face in the coming decade.
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https://lbnl.zoom.us/j/99705341835
Meeting ID: 997 0534 1835

NO VIRTUAL - INPA Seminar - Friday, May 1, 2020
2020-05-01 12:00 - 13:00

VIRTUAL INPA SEMINAR – Rémi Adam (LLR/CNRS)
2020-04-24 12:00 - 13:00
Speaker: Rémi Adam (LLR/CNRS)
Title: Diffuse gas in galaxy clusters: on the thermal and non-thermal components
Abstract:
The clusters of galaxies represent the last step of the formation of large scale structures in the Universe. They are both useful cosmological probes and unique astrophysical laboratories. The clusters grow by accretion of surrounding structures and from the merging of subclusters, in very energetic events, eventually forming a diffuse gas phase made of a hot thermal component, but also leading to particle acceleration up to very high energies. After introducing the role of clusters in our understanding of the assembly of matter in the Universe, I will discuss how we can study the diffuse gas phase across cosmic time. The presentation will highlight results based on the NIKA/NIKA2 camera at the IRAM 30m telescope, sensitive to the thermal gas pressure via the Sunyaev-Zel’dovich effect. I will also present prospects for probing the non-thermal component in the gamma rays with the CTA observatory.
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https://lbnl.zoom.us/j/94805534408
Meeting ID: 948 0553 4408

VIRTUAL INPA SEMINAR – Ethan Bernard (UC Berkeley)
2020-04-17 12:00
Speaker: Ethan Bernard (UC Berkeley)
Title: The Construction of the LZ Dark Matter Detector
Abstract:

The assembly of the LUX-ZEPLIN (LZ) dark matter detector within the Homestake mine in Lead, South Dakota is nearing completion. This detector features a two-phase time projection chamber containing seven tons of liquid xenon specifically instrumented to detect low-energy nuclear recoils. The detector is nested within an active veto system, a passive water shield, and 1500 m of rock overburden. Low-background construction and efficient measurement of scintillation light and ionization electrons will allow detection of hypothetical WIMP (weakly interacting massive particle) dark matter to a sensitivity at least an order of magnitude beyond present limits. This talk will provide an overview of the design and assembly of this detector with a focus on the unique engineering challenges posed by building a low-background noble liquid experiment at such a large scale.

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https://lbnl.zoom.us/j/92275279117
Meeting ID: 922 7527 9117

VIRTUAL INPA SEMINAR – Nicholas Rodd (LBNL) - URL and Meeting ID Revision
2020-04-10 12:00 - 13:00
Speaker: Nicholas Rodd (LBNL)

Title: Evidence the 3.5 keV line is not from dark matter decay
Abstract:
X-ray observations of nearby clusters and galaxies have reported an unexpected X-ray line around 3.5 keV. This line has received significant attention due to its possible explanation through decaying dark matter; in particular, decaying sterile neutrino models, with a sterile neutrino mass around 7 keV, provide a good fit to the available data. We use over 30 Ms of XMM-Newton blank-sky observations to search for evidence of the 3.5 keV line consistent with arising from decaying dark matter within the ambient halo of the Milky Way. We find the strongest limits to-date on the lifetime of dark matter in this mass range, strongly disfavoring the possibility that the 3.5 keV line originates from dark matter decay.
REVISION – URL AND MEETING ID
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https://lbnl.zoom.us/j/993531175
Meeting ID: 993 531 175

VIRTUAL INPA SEMINAR – Zara Bagdasarian (UC Berkeley)
2020-04-03 12:00 - 13:00
Speaker: Zara Bagdasarian (UC Berkeley)

Title: Borexino. Sun. Earth. Neutrinos

Abstract:
Borexino experiment is a 280-ton liquid scintillator detector located at a 3800 m w.e. depth in the Laboratori Nazionali del Gran Sasso (Italy). In more than 12 years of data taking, Borexino has demonstrated how its unprecedented radio-purity led to exploring a wide range of neutrino physics questions in previously poorly explored low energy range.

In 2018-2020, Borexino published a comprehensive study of pp-chain solar neutrinos, which sets new milestones in the solar neutrino measurement precision. These neutrinos are the products of the pp-chain of nuclear fusion reactions generating more than 99% of the Sun’s energy. We use the gathered data as a two-fold tool to explore both neutrino and solar physics questions.

Moreover, Borexino is one of only two detectors in the world who have measured geoneutrinos. The results, published in 2020, feature increased statistics and the new elaborate analysis. With this update, we have now been able to access 53 geoneutrino events – almost twice as many as in the result published by the collaboration in 2015. The geological interpretations of this measurement will also be discussed in the talk.

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https://lbnl.zoom.us/j/812787340

Meeting ID: 812 787 340

Special INPA SEMINAR – Rebecca Carney (SLAC)
2020-03-09 11:00 - 12:00 | 50B-4205
Speaker: Rebecca Carney (SLAC)

Title: Silicon tracking in the search for rare processes

Abstract: The ATLAS Detector, below the surface of the Swiss-French border, measures the remnants of high-energy proton-proton collisions, accelerated by the Large Hadron Collider (LHC) at CERN. A little over a year ago the LHC paused operations, having delivered an integrated luminosity corresponding to 150 fb^−1 of data at a centre-of-mass energy of 13 TeV. This talk will describe a search for physics beyond the Standard Model using that dataset, as well as the charged particle tracking detector technology that renders it possible.

Searching for rare processes requires sifting through a large amount of data, so in 2027 the LHC will enter a High Luminosity phase (HL-LHC), increasing the instantaneous luminosity by a factor of five and delivering 4000 fb^-1 within twelve years. This will impose significant technical challenges on all aspects of the ATLAS detector, resulting in the entire Inner Detector being replaced by an all-silicon tracker. ITk (the new “Inner TracKer”) will be comprised of Strip and Pixel detectors. This talk will also discuss the design of the ITk Pixel detector to handle the increased number of hits per chip and modeling of the damage to the silicon sensor, both to predict the detector performance and to understand the effects of radiation damage on data taking.

Special INPA Seminar – Gulden Othman (University of North Carolina)
2020-02-24 11:00 - 12:00 | 50A-5132- Sessler, 50A-5132 Sessler Conference Room, CA
Speaker: Gulden Othman (University of North Carolina)
Title: CAGE Scanner: Investigating Surface Backgrounds in HPGe Detectors for Neutrinoless Double-Beta Decay Searches
Abstract: A potential source of problematic backgrounds in a ton-scale 76Ge-based neutrinoless double-beta decay (0nuBB) program may arise from particle interactions occurring near the surfaces of high purity germanium (HPGe) detectors. The Collimated Alphas, Gammas, and Electrons scanner (CAGE) is a test stand that allows for in-depth studies of surface events by using vacuum-side, collimated radiation sources to characterize the response of HPGe detectors to radiation at specific locations on the detector surface. LEGEND is a search for 0nuBB in the 76Ge isotope that will begin operation of a 200 kg array in 2021, with a plan to scale up to 1000 kg of 76Ge-enriched HPGe detectors in a phased approach. In order to reach LEGEND-1000’s goal of a half-life sensitivity >10^28 years, understanding and discriminating against backgrounds from surface events is essential. I will motivate the design and current status of CAGE in the context of LEGEND as we begin characterizing the response of two detector geometries that will be used in LEGEND to surface alpha interactions.

INPA Seminar - Chiara Capelli (University of Zurich)
2020-02-21 12:00 - 13:00 | 50A-5132- Sessler, 50A-5132 Sessler Conference Room, CA
Speaker: Chiara Capelli (University of Zurich)
Title: Data analysis at high-energies for the XENON1T experiment and light calibration system of XENONn
Abstract: The XENON1T experiment searches for Weakly Interacting Massive Particles (WIMPs) with a dual-phase xenon Time Projection Chamber (TPC). To extend its physics reach, the efforts of the XENON collaboration are directed toward exploring other detection channels. For this purpose, considerable work on the signal reconstruction and data analysis has been done to extend the available energy range up to 3\,MeV, two orders of magnitude higher than the standard WIMP analysis. This would allow one to search for the neutrinoless double beta decay (0$
ubetabeta$) of $^{136}$Xe, which is fundamental to probing the Majorana nature of neutrinos and solving the hierarchy problem. The achievements and future prospects for the high-energy analysis with dual-phase TPCs will be presented. Furthermore, the upcoming XENONnT experiment, an upgrade of XENON1T with a larger TPC and reduced background, is expected to start taking data in 2020. Its main goal is to increase the sensitivity to WIMPs by an order of magnitude compared to the current best limit, as well as improving the search for 0$
ubetabeta$. An overview of the new systems, with attention on the light calibration of the 494 photomultiplier tubes (PMTs) will be also presented.

Special INPA SEMINAR - Wouter Van De Pontseele (Harvard/Oxford)
2020-02-19 15:30 - 16:30 | 50A-5132- Sessler, 50A-5132 Sessler Conference Room, CA
Speaker: Wouter Van De Pontseele (Harvard/Oxford)

Title: The MicroBooNE Neutrino Experiment at Fermilab

Abstract: MicroBooNE is a liquid argon time projection chamber in the Booster Neutrino Beam at Fermilab. The technology provides high-resolution imaging of neutrino interactions leading to low-threshold event reconstruction with full angular coverage. As such, this is an ideal place to probe neutrino-argon interactions in the hundreds-of MeV to few-GeV energy range. This talk presents a start-to-end overview demonstrating the physics capabilities of the detector. I will talk about cosmic ray measurement and characterisation, our dominant background.
Furthermore, I will describe the flavour-agnostic neutrino pre-selection, based on the combination of the charge collected by the TPC and the optical information form the PMT system. An overview of recent measurements of neutrino interactions in MicroBooNE, including inclusive charged-current interactions, will be given. I will conclude summarising the ongoing efforts towards our first low-energy-excess results, demonstrating our capability to identify electron neutrinos.

Speaker: Vishal Gajjar (UC Berkeley)
2020-02-14 12:00 - 13:00 | 50A-5132- Sessler, 50A-5132 Sessler Conference Room, CA
Title: Breakthrough Listen’s search for intelligent life in the Universe

Abstract: The discovery of the ubiquity of habitable extrasolar planets, combined with revolutionary advances in instrumentation and observational capabilities, have ushered in a renaissance in the millennia-old quest to answer our most profound question about the Universe and our place within it – Are we alone? The Breakthrough Listen Initiative announced in July 2015 as a 10-year 100M USD program is the most comprehensive effort in history to quantify the distribution of advanced, technologically capable life in the universe. In this talk, I outline the status of the on-going observing campaign with our primary observing facilities, as well as planned activities with these instruments over the next few years. I will also talk about collaborative facilities which will conduct searches for technosignatures in either primary observing mode or commensally. I will highlight some of the novel analysis techniques we are bringing to bear on multi-petabyte data sets, including machine learning tools we are deploying to search for a broader range of technosignatures than was previously possible. https://arxiv.org/abs/1907.05519

INPA Seminar - Harikrishnan Ramani (LBNL)
2020-02-07 12:00 - 13:00 | 50A-5132- Sessler, 50A-5132 Sessler Conference Room, CA
Speaker: Harikrishnan Ramani (LBNL)

Title: Nuclear Isomers as Dark Matter accelerators
Abstract: Weak-scale dark matter particles, in collisions with nuclei, can mediate transitions between different nuclear energy levels. In particular, owing to sizeable momentum exchange, dark matter particles can enable de-excitation of nuclear isomers that are extremely long lived with respect to regular radioactive decays. In this paper, we utilize data from a past experiment with $^{rm 180m}$Ta to search for $gamma$-lines that would accompany dark matter induced de-excitation of this isomer. Non-observation of such transitions above background yields the first direct constraint on the lifetime of $^{rm 180m}$Ta against DM-initiated transitions: $T_{1/2}>1.3times 10^{14}$~a at 90% C.I. Using this result, we derive novel constraints on dark matter models with strongly interacting relics, and on models with inelastic dark matter particles. Existing constraints are strengthened by this independent new method. The obtained limits are also valid for the Standard Model $gamma$-decay of
uc{Ta}{rm 180m}.

Special INPA SEMINAR - Karthik Ramanathan (University of Chicago)
2020-02-04 11:00 - 12:00 | 50A-5132- Sessler, 50A-5132 Sessler Conference Room, CA
Speaker: Karthik Ramanathan (University of Chicago)

Title: Dark Matter Taking Selfies: The DAMIC Experiment

Abstract: The DAMIC (Dark Matter in CCDs) experiment uses silicon charge-coupled devices (CCDs), traditionally employed for imaging purposes, to detect potential ionization signals from dark matter interactions. These approx. mm thick devices feature an impressively low leakage current (< 10-21 A/cm2) and a very low energy threshold (40 eVee), making them ideal low-mass dark matter detectors. In addition, their unique spatial resolution provides for effective identification and mitigation of environmental backgrounds. In this talk, I will highlight recent dark matter-electron scattering limits from the experiment at SNOLAB, discuss the kg-size next generation DAMIC-M detector funded for operation, and show results from “Skipper”instrumented CCDs – a novel readout technique that allows for counting of individual charges, with a demonstrated resolution of 0.07 e-, which ushers in a new era of sensitivity to low-energy interactions.

Speaker: Ann-Kathrin Schutz - Eberhard Karls University of Tubingen
2020-01-31 12:00 - 13:00
Title: Full analysis of the background for the search of neutrinoless double beta decay in Gerda

Abstract: The GERmanium Detector Array (Gerda) experiment aims for the discovery of neutrinoless double beta decay (0νββ) decay in 76Ge. It uses HPGe detectors enriched in the isotope 76Ge, which are directly immersed into liquid argon (LAr). In second phase (Phase II) of Gerda, the radio-pure cryogenic liquid acts not only as cooling medium for the detectors and passive shielding but also as active shielding. Phase II started data taking in Dec 2015 with the design goal of increasing the sensitivity to T 0ν1/2 = O1026 yr by reducing the background by one order of magnitude. Due to the active veto system detecting LAr scintillation light, the superior energy resolution and an improved background recognition, the initial release of Phase II already showed a background rate in the energy region of interest (ROI), after pulse shape discrimination (PSD) and liquid argon veto cuts, in the range of a few counts/(ROI·ton·yr). This made Gerda the first 0νββ experiment being background free up to its design exposure of 100 kg·yr. With the latest data release in mid 2018, comprising a total exposure of 82.4 kg·yr, Gerda remained in the background free regime and it is the first experiment to surpass a median sensitivity on the half-life of 1026 yr for 0νββ decay.
In this talk, a full analysis of the background is presented where all available information on the background has been incorporated in order to develop a detailed background model describing the decomposition of the measured energy spectrum. For the first time, the single- and two-detector data have been combined in a multivariate Bayesian fit approach. Additionally, the background model focuses further on two prominent features in the energy spectrum: the α events dominating the high energy part of the spectrum and the count rates of the potassium γ-lines at 1525 keV and 1461 keV. Thanks to the granularity of the detector array, a study of the coincident events in the two-detector data which can provide further information regarding the location of contaminations has been integrated. Using the background model, important information on the main sources and their locations contributing to the background around
the Q-value of the decay (Qββ) can be deduced. Besides, the spectral shape of the total background around Qββ can be extracted. Both are crucial input informations for reliable results on the 76Ge 0νββ signal search.

Speaker: Jiamin Hou - Max-Planck - Institute for Extraterrestrial Physics
2020-01-24 12:00 - 13:00
Title: Clustering measurements in the final eBOSS quasar sample and their cosmological implications
Abstract:In this talk I present the clustering analysis of the final extended Baryon Oscillation Spectroscopic Survey (eBOSS) quasar sample at redshift 0.8<z<2.2, which bridges the redshift gap between the eBOSS LRG and Lyman-alpha measurements. Mapping the evolution of the expansion and growth of structure histories of our Universe provides us with a crucial test of the standard LCDM cosmological scenario. Our analysis includes a detailed modelling of the impact of the non-linear evolution of density fluctuations, bias, and redshift-space distortions on the two-point correlation function. Using numerical simulations designed to reproduce the uniqueness of the quasar sample, we perform extensive validation tests to characterise potential systematic errors induced by theoretical and observational effects. The constraints obtained from anisotropic clustering measurements can be used to test models of gravity on large-scales. However, these tests require the validation of our analysis techniques in modified gravity scenarios. I present an example of such tests, based on large numerical simulations of standard and modified gravity models to measure galaxy clustering in redshift space.

Speaker: Arnaud De Mattia - IRFU, CEA, Université Paris-Saclay
2020-01-17 12:00 - 13:00
Title: The extended Baryon Oscillation Spectroscopic Survey: clustering measurements, lessons, and prospects
Abstract: In this talk, I will present the clustering analysis of the ELG (Emission Line Galaxy) sample from the eBOSS (extended Baryon Oscillation Spectroscopic Survey) program of the Sloan Digital Sky Survey and review the other clustering analyses of the eBOSS program, dedicated to Luminous Red Galaxies and Quasars. I will discuss theoretical, observational and analysis systematics, how they were estimated and mitigated, focusing on the improvements over the last release of the BOSS program in 2016. Specifically, I will start by presenting the extensive work of the eBOSS collaboration to test model predictions against N-body simulations. The different observational systematics of the eBOSS samples will be reviewed, as well as the adopted correction schemes and the new analysis techniques used to mitigate residual systematics. Different analysis assumptions and their impact on the clustering signal will be discussed. After a review of eBOSS legacy cosmological measurements, I will finish by drawing lessons and prospects for future galaxy surveys.

Speaker: Samuel Hinton - University of Queensland
2020-01-10 12:00 - 13:00
Title: Challenges and pathways forward in supernova cosmology
Abstract: Using the DES photometric supernova cosmology analysis as groundwork, I will summarise our current analysis methodologies, from simulations, to transient classification, selection effect treatment, and cosmology. Despite recent improvements in analysis methods, there still exist fundamental challenges in areas spanning the initial empirical SN Ia model all the way to failing approximations built into cosmology fitters. I will highlight potential solutions to these challenges, to allow the next generation of surveys to lower the systematic floor and provide improved cosmological constraints. Additionally, I will also summarise my BAO and pipeline work for surveys like DESI, and discuss ways I’ve improved scientific workflow to allow more efficient use of researcher time.

Speaker: Suk Sien Tie - Ohio State University
2019-12-06 12:00 - 13:00
Title: Cosmology with the Lya forest: beyond two-point statistics, DESI instrumentation
Abstract: The Lyman-alpha forest is currently the only probe of cosmology and the state of the intergalactic medium (IGM) between redshifts of z=2 and 6. It’s higher-order clustering, specifically its three-point correlation function (3PCF), contains information that can help to constrain fluctuations in the ionizing background and temperature fields of the IGM, thus providing a novel way to constrain their effects on cosmological analyses of the LyA forest. In this talk, I will present theoretical predictions of the 3PCF of the LyA forest, considering both a uniform and spatially varying UV background. I will discuss the exciting possibilities that future surveys like DESI will enable in this area. Finally, I will present my instrumentation work on the DESI sky camera and the fiber positioner anti-collision algorithm, and how they facilitate the DESI survey to achieve its science goals.

Speaker: Chirag Modi - University of California, Berkeley
2019-11-22 12:00 - 13:00
Title: Reconstruction of Cosmological Fields in Forward Model Framework – Galaxy Clustering and Intensity Mapping
Abstract:
In this talk, I will outline the forward model approach to reconstruct cosmological fields in a Bayesian framework. I will focus on two examples – galaxy clustering and neutral hydrogen intensity mapping.
In galaxy clustering example, I will use the observations of galaxy surveys to reconstruct the initial Lagrangian field.
Here, we develop a novel framework with neural networks to forward model halo masses and positions and demonstrate that our method outperforms standard reconstruction in both real and redshift space.
This reconstructed initial field has enhanced signal for baryon acoustic oscillations and can enhance science returns for surveys like DESI.
For neutral hydrogen surveys, we lose over 50% of the modes at high redshifts due to foregrounds and it severely hampers their feasibility for cosmological analysis.
With a novel bias framework for the forward model, I will show that we are able to reconstruct over 90% of these modes and this recovers cross-correlations with photo-z surveys like LSST and tracers like CMB lensing. Lastly, I will briefly touch upon assumptions made in this reconstruction framework regarding noise models and likelihood. I will discuss preliminary ways to improve upon them using deep learning.

Speaker: Solène Chabanier - IRFU, CEA, Université Paris-Saclay
2019-11-08 12:00 - 13:00
The title and abstract are forthcoming.

Speaker: Katherine Rawlins - University of Alaska at Anchorage
2019-10-25 12:00 - 13:00

Speaker: Mattia Beretta - Development & Application of Scintillation Detectors for Rare Events Searches
2019-10-11 12:00 - 13:00

Speaker: Daniel Whiteson - What has the Machine Learned?
2019-10-04 12:00 - 13:00 | INPA Common Room, 50-5026

Will Thompson - COSINE-100 (Yale)
2019-07-12 12:00 - 13:00
TBA

Adam Bernstein (LLNL) - The Watchman Experiment
2019-06-28 12:00 - 13:00 | 50A-5132- Sessler, 50A-5132 Sessler Conference Room, CA

Vid Irsic (UW) - Lyman-alpha forest
2019-05-24 12:00 - 13:00 | 50A-5132- Sessler, 50A-5132 Sessler Conference Room, CA

Ben Land (UCB) - Solar neutrinos with SNO, SNO+, and Beyond
2019-05-17 12:00 - 13:00 | 50A-5132- Sessler, 50A-5132 Sessler Conference Room, CA
This seminar gives a brief historical introduction to solar neutrino detection, and motivates the use of solar neutrinos as a tool to probe physics beyond the standard model. An analysis of SNO data constraining the lifetime of neutrino decay is presented, along with solar neutrino results from SNO+ water phase. Additionally, R&D for simultaneous detection of Cherenkov and scintillation light in future solar neutrino experiments is discussed, with a first look at single photon detection characteristics of LAPPDs.

NO INPA SEMINAR MTG
2019-05-10 12:00 - 13:00 | INPA Common Room, 50-5026
