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The topic of this thesis is the measurement of W and Z bosons associate production in the lepton plus neutrino plus Heavy Flavor (HF) quarks nal state: p $\bar{p}$→ WW/WZ→ ℓv+ HF;
In this thesis we present a search for the WZ and ZZ production in a final state ("W+2 jets") with a leptonically-decaying W and two energetic jets. We use the full dataset ( ∫ Ldt = 8:9 fb -1 ) recorded with the CDF detector at Fermilab. The challenge consists in extracting the small Z-hadronic peak from the large amount of background processes. Those processes also include the WW, whose hadronic peak cannot be distinguished from the Z peak, due to the poor calorimeter resolution. In the past such a signature was used to measure the diboson cross section, which is highly dominated by the WW cross section.
Searches for SM Higgs boson production in the leptons plus jets final states with a data set corresponding to 9.7 fb -1 of $\bar{p}$p collisions at √s = 1.96TeV collected by the DØ Experiment are presented in this thesis. The searches are carried out in two independent analyses, accounting for different signal topologies.
We present the results of the CDF search for a Standard Model Higgs boson decaying into a pair of W bosons with electrons, muons and hadronically decaying taus in the final state. In particular, we investigate a channel with three objects, two leptons and a tau. In 9.7 fb -1 of data we expect 40.0 ± 5.4 background events and 0.54 ± 0.05 signal events for a Higgs mass hypothesis of 160 GeV/c 2 , whereas in data we count 28 events. We set a 95% C.L. upper limit on σ/σSM of 12.6 for a Higgs mass hypothesis of 160 GeV/c 2 . The expected 95% C.L. upper limit for the same mass is 12.4. Results for other ninete 0 GeV/c2 to 200 GeV/c 2 are also presented.
A two-day workshop, "The Tau-Charm Factory in the Era of B-factors and CESR," was held at SLAC in August, 1994. This paper summarizes the important research on the tau lepton which could be done at a tau-charm factory in the next decade. It is based on the presentation by the speakers and on the discussions by participants, as well as on published papers.
Charged-lepton avour-violating (cLFV) processes offer deep probes for new physics with discovery sensitivity to a broad array of new physics models | SUSY, Higgs Doublets, Extra Dimensions, and, particularly, models explaining the neutrino mass hierarchy and the matterantimatter asymmetry of the universe via leptogenesis. The most sensitive probes of cLFV utilize high-intensity muon beams to search for $\mu \to e$ transitions. We summarize the status of muon-cLFV experiments currently under construction at PSI, Fermilab, and J-PARC. These experiments offer sensitivity to effective new physics mass scales approaching $O (10^4)$ $TeV=c^2$. Further improvements are possible and next-generation experiments, using upgraded accelerator facilities at PSI, Fermilab, and J-PARC, could begin data taking within the next decade. In the case of discoveries at the LHC, they could distinguish among alternative models; even in the absence of direct discoveries, they could establish new physics. These experiments both complement and extend the searches at the LHC.
The search for Charged Lepton Flavor Violation as part of the Mu2e experiment is described.
The Mu2e experiment at Fermilab is described. Areas covered include: Charged Lepton Flavor Violation (CLFV); CLFV measurements; Muon to electron conversion search on Mu2e; The experimental apparatus; Current status; and, Next plan -- Mu2e II.
The Charged Lepton Flavor Violation (CLFV) activity at Fermilab is described.
Progress is described on the search for Charged Lepton Flavor Violation as part of the Mu2e Experiment at Fermilab.
Characteristic time scales of leptonization (τ + ), deleptonization (τ – ), and fluid motion (τ a ) in a disk of hot gas accreting on to a black hole formed after a failed supernova. These time scales are set by neutrino emission, absorption, and magnetohydrodynamic turbulence, highlighting the complex interplay between the four forces of nature in these enigmatic systems.
This Snowmass 2021 contributed paper discusses a Higgs-Energy LEptoN (HELEN) e⁺e⁻ linear collider based on advances superconducting radio frequency technology. The proposed collider offers cost and AC power savings, smaller footprint (relative to the ILC), and could be built at Fermilab with an Interaction Region within the site boundaries. After the initial physics run at 250 GeV, the collider could be upgraded either to higher luminosity or to higher (up to 500 GeV) energies. If the ILC could not be realized in Japan in a timely fashion, the HELEN collider would be a viable option to build a Higgs factory in the U.S.
In this talk, I will present a search for long-lived heavy neutral leptons decaying in the CMS muon detectors.
The smallness of neutrino masses in conjunction with the observed flavor oscillations in the neutrino sector can be hinting to physics beyond the standard model. These observations can be naturally accommodated by the so-called "seesaw" mechanism, in which new Heavy Neutral Leptons (HNL) are postulated. Additionally, several HNL models provide a DM candidate or include a possible explanation for the observed baryon asymmetry. This talk presents an comprehensive overview of the CMS HNL program with a focus on the new experimental results as shown in a recently published review paper by CMS.The talk will highlight several novel and complementary approaches using both prompt and long-lived signatures using the full Run-II data-set collected at the LHC.
Neutrinoless double beta decay and Lepton Number Violation
Heavy Neutral Leptons (HNLs) are hypothetical long-lived particles that extend the Standard Model and provide a natural explanation for the origin of neutrino masses, the generation of the baryon asymmetry through leptogenesis, and the nature of dark matter. The Short-Baseline Near Detector (SBND) is a 112-ton liquid argon time projection chamber located 110 m away from the Booster Neutrino Beam (BNB) target at Fermilab (Illinois, USA). The close location to the BNB origin makes the experiment sensitive to HNLs produced from meson decays in the beam. These heavy particles arrive at the detector later than neutrinos and decay into observable final states such as 𝜈e+e- or 𝜈π0, generating isolated electromagnetic showers. Thanks to SBND’s advanced scintillation light detection system, a timing resolution at the nanosecond level further boosts the experiment capabilities. In this poster, we present ongoing reconstruction efforts towards HNLs as well as expected sensitivities factoring in the reconstruction improvements.