Bulletin of the American Physical Society
APS April Meeting 2023
Volume 68, Number 6
Minneapolis, Minnesota (Apr 15-18)
Virtual (Apr 24-26); Time Zone: Central Time
Session D11: Physics of the Higgs Boson |
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Sponsoring Units: DPF Chair: Brian Shuve, Harvey Mudd College Room: Marquette II - 2nd Floor |
Saturday, April 15, 2023 3:45PM - 3:57PM |
D11.00001: Testing the Feasibility of Tri-Higgs Production at LHC Hongyu Zhang While the groundbreaking discovery of the Higgs Boson in 2012 at the Large Hadron Collider (LHC) filled in the last piece of the puzzle for the Standard Model. Though the study continues, the full set of Higgs boson production modes at the LHC and the associated mechanisms are yet to be measured. Di-Higgs and tri-Higgs production especially allow us to inspect the parameters of Higgs self-coupling and the shape of the Higgs potential. Such processes are rare, so, we use Monte Carlo simulation to generate particle collision events to study kinematic features of di- Higgs and tri-Higgs production. An event here contains all the information recorded for one collision. These properties allow us to infer the production rate of di-Higgs and tri-Higgs at LHC, which allows us to constrain the Higgs coupling parameters, giving us the shape of the Higgs potential. We have measured the production rate of three boosted Higgs and two boosted Higgs. We are currently looking into the kinematic properties of these Higgs production modes and will further constrain the Higgs self-coupling parameters in the future. |
Saturday, April 15, 2023 3:57PM - 4:09PM |
D11.00002: Top Yukawa Coupling Deviations in Muon Colliders Ishmam Mahbub, Zhen Liu, Kunfeng Lyu Top Yukawa coupling is deeply connected to many fundamental puzzles in Higgs and Electroweak physics. In this study, we seek to measure the Top Yukawa coupling at the future high-energy muon colliders utilizing the Higgs unitarization in the VLVL → tt* process. If the Top Yukawa coupling deviates from the Standard Model (SM) value, the amplitude of the processes with gauge bosons and top quarks V V → tt* will increase and deviate from the SM rate as a function of the tt* center of mass energy. Using this method, we do not need to produce on-shell Higgs boson but indirectly probe its coupling to the top quark. We show that using a muon collider with 10TeV energy and 10ab-1 integrated luminosity, the collider can probe the Top Yukawa with a precision better than 1.5%. This is a significant improvement from the projected high-luminosity LHC (HL-LHC) limit of 3.2% and the tt*H process sensitivity at muon colliders. |
Saturday, April 15, 2023 4:09PM - 4:21PM |
D11.00003: Search of Rare Decays of the Higgs Boson Jesse D Harris Rare decays of the Higgs boson are promising laboratories to search for physics beyond the standard model (BSM). Such BSM physics might alter Yukawa couplings to lighter quarks or enter via loop diagrams, possibly resulting in higher decay rates than predicted by the standard model. Of particular interest are decays of the Higgs boson into a Z boson and a quarkonium state. For the first time the decay of the Higgs boson into a Z boson and Upsilon states are searched for, where the Υ(1S), Υ(2S) and Y(3S) states are combined. For these decays and decays into Z and charmonium states machine learning techniques are applied to characterize the background. A data sample of proton-proton collisions collected at a center-of-mass energy of 13 TeV with the Compact Muon Solenoid detector at the Large Hadron Collider that corresponds to an integrated luminosity of about 137 fb−1 is used. I will present the searches and implications for future searches of BSM signatures at higher luminosity. |
Saturday, April 15, 2023 4:21PM - 4:33PM |
D11.00004: Search for Anomalous Higgs Boson Couplings in the Production of WH via Vector Boson Scattering Jonathan K Guiang The measured properties of the Higgs boson are in good agreement with the Standard Model (SM) prediction. All the couplings are consistent with the SM, but they are measured as absolute values. In particular, the coupling modifiers for the W and Z boson (κW and κZ in the “κ” framework) are allowed to have either a positive or negative sign in previous CMS fits. In this analysis we use the production of a W and Higgs boson (WH) via vector boson scattering (VBS) to probe the relative sign of the vector boson couplings, i.e. the κW/κZ=λWZ parameter that is predicted to be 1 in the SM. We specifically search for VBS WH production with negative κW and positive κZ, which is equivalent to negative κZ and positive κW (negative λWZ) at tree level. The final state considered includes one lepton from the W candidate, a large-cone jet tagged as a Higgs candidate and two jets for the VBS signature. The analysis uses data from proton-proton collisions at √s = 13 TeV, collected by the CMS detector during 2016, 2017 and 2018, corresponding to 138 fb-1. Negative values of λWZ are expected to be excluded. |
Saturday, April 15, 2023 4:33PM - 4:45PM |
D11.00005: Modeling of EFT effects in off-shell Higgs boson production Ruoxi Wang We present simulation of the off-shell Higgs boson production in the gluon fusion and electroweak channels, including effects of operators in the Effective Field Theory framework. Prospects of analysis of LHC data are presented. |
Saturday, April 15, 2023 4:45PM - 4:57PM |
D11.00006: Search for Higgs Boson Pair Production in the Multi-lepton Final State Using Proton-Proton Collision Data at $sqrt{s} =13$ TeV with the ATLAS Detector Santosh Parajuli This talk will present a search strategy for Higgs boson pair-production in final states with three electrons or muons. The analysis is performed using an integrated luminosity of 139 fb$^{-1}$ of $pp$ collision at $sqrt{s}= 13$ TeV collected by the ATLAS detector at the LHC. This analysis focuses on decays of Higgs boson pairs that occur with small branching ratios, which are generally not covered by dedicated analyses. Some example modes of particular interest for a three lepton final state are WWWW, WW$ au au$, $ au au au au$, etc. This talk presents the development of a multivariate strategy (boosted decision trees) and current work on background estimation methods and statistical analysis. |
Saturday, April 15, 2023 4:57PM - 5:09PM |
D11.00007: Results from Di-Higgs Searches with the ATLAS detector at CERN's Large Hadron Collider Suyog Shrestha The Standard Model of Particle Physics (SM) has been incredibly successful with its predictions validated by observations. The discovery of the Higgs boson (H) in 2012 by ATLAS and CMS experiments at the Large Hadron Collider (LHC) was a triumph of the SM. Since its discovery, many measurements of the Higgs boson’s properties have been carried out, and so far all the results agree with the SM predictions within uncertainties. However, in order to fully characterize the Higgs boson, it is necessary to measure its coupling to itself (Higgs self-coupling), a property that has deep theoretical and cosmological consequences. Measurement of the quartic Higgs self-coupling is not possible in any current experimental facility, but the trilinear Higgs boson self-coupling can be accessed in events with pair-produced Higgs bosons (HH) at the LHC. In this talk, we will present the most recent results from HH searches performed with the ATLAS detector at the LHC, including results on trilinear Higgs self-coupling and results from Beyond the SM searches in the HH decay modes. |
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