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Search for Higgs Boson Pair Production in the bb̅ τ+ τ- Decay Channel

2018-12-06 Science
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Release : 2018-12-06
Genre : Science
Kind : eBook
Book Rating : 550/5 ( reviews)

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Book Synopsis Search for Higgs Boson Pair Production in the bb̅ τ+ τ- Decay Channel by : Luca Cadamuro

Download or read book Search for Higgs Boson Pair Production in the bb̅ τ+ τ- Decay Channel written by Luca Cadamuro. This book was released on 2018-12-06. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents innovative contributions to the CMS experiment in the new trigger system for the restart of the LHC collisions in Run II, as well as original analysis methods and important results that led to official publications of the Collaboration. The author's novel reconstruction algorithms, deployed on the Field-Programmable Gate Arrays of the new CMS trigger architecture, have brought a gain of over a factor 2 in efficiency for the identification of tau leptons, with a very significant impact on important H boson measurements, such as its decays to tau lepton pairs and the search for H boson pair production. He also describes a novel analysis of HH → bb tautau, a high priority physics topic in a difficult channel. The original strategy, optimisation of event categories, and the control of the background have made the result one of the most sensitive concerning the self-coupling of the Higgs boson among all possible channels at the LHC.

Search for Resonant Higgs Boson Pair Production in the Semi-leptonic Bb ̅WW* Decay Channel with the ATLAS Detector at the Large Hadron Collider

2018
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Release : 2018
Genre :
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Book Synopsis Search for Resonant Higgs Boson Pair Production in the Semi-leptonic Bb ̅WW* Decay Channel with the ATLAS Detector at the Large Hadron Collider by : Nurfikri Bin Norjoharuddeen

Download or read book Search for Resonant Higgs Boson Pair Production in the Semi-leptonic Bb ̅WW* Decay Channel with the ATLAS Detector at the Large Hadron Collider written by Nurfikri Bin Norjoharuddeen. This book was released on 2018. Available in PDF, EPUB and Kindle. Book excerpt:

Searches for Higgs Boson Pair Production in the Hh{u2192}bb??, ??WW*, ??bb, Bbbb Channels with the ATLAS Detector

2015
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Release : 2015
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Book Synopsis Searches for Higgs Boson Pair Production in the Hh{u2192}bb??, ??WW*, ??bb, Bbbb Channels with the ATLAS Detector by :

Download or read book Searches for Higgs Boson Pair Production in the Hh{u2192}bb??, ??WW*, ??bb, Bbbb Channels with the ATLAS Detector written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: Searches for both resonant and nonresonant Higgs boson pair production are performed in the hh → bb??, ??WW* final states using 20.3 fb-1 of pp collision data at a center-of-mass energy of 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. No evidence of their production is observed and 95% confidence-level upper limits on the production cross sections are set. These results are then combined with the published results of the hh → ??bb, bbbb analyses. An upper limit of 0.69 (0.47) pb on the nonresonant hh production is observed (expected), corresponding to 70 (48) times the SM gg → hh cross section. For production via narrow resonances, cross-section limits of hh production from a heavy Higgs boson decay are set as a function of the heavy Higgs boson mass. The observed (expected) limits range from 2.1 (1.1) pb at 260 GeV to 0.011 (0.018) pb at 1000 GeV. In addition, these results are interpreted in the context of two simplified scenarios of the Minimal Supersymmetric Standard Model.

Search for Resonant Higgs Boson Pair Production in the Bb̄WW* Decay Channel in the Boosted 1-lepton Final State Using the Full Run 2 ATLAS Dataset

2022
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Release : 2022
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Book Synopsis Search for Resonant Higgs Boson Pair Production in the Bb̄WW* Decay Channel in the Boosted 1-lepton Final State Using the Full Run 2 ATLAS Dataset by : Kira Abeling

Download or read book Search for Resonant Higgs Boson Pair Production in the Bb̄WW* Decay Channel in the Boosted 1-lepton Final State Using the Full Run 2 ATLAS Dataset written by Kira Abeling. This book was released on 2022. Available in PDF, EPUB and Kindle. Book excerpt: Despite the great success of the Standard Model of Particle Physics in explaining physics phenomena over a wide range of energy scales, many open questions remain and it is known that this model of nature is incomplete. The Higgs boson as the most recent discovered particle has completed the Standard Model. With its coupling to mass, it is an excellent candidate to shed light on physics beyond the Standard Model. This thesis presents the search for resonant Higgs boson pair (HH) production as well as resonant production of a Higgs boson in association with another additional scalar particle...

Higgs Boson Production with a Top Quark Pair in the Diphoton Channel, Double Higgs Production in the Bb-diphoton Channel, and Inner Tracker Upgrade with the Atlas Detector at the Large Hadron Collider

2023
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Release : 2023
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Book Synopsis Higgs Boson Production with a Top Quark Pair in the Diphoton Channel, Double Higgs Production in the Bb-diphoton Channel, and Inner Tracker Upgrade with the Atlas Detector at the Large Hadron Collider by : Alex Zeng Wang

Download or read book Higgs Boson Production with a Top Quark Pair in the Diphoton Channel, Double Higgs Production in the Bb-diphoton Channel, and Inner Tracker Upgrade with the Atlas Detector at the Large Hadron Collider written by Alex Zeng Wang. This book was released on 2023. Available in PDF, EPUB and Kindle. Book excerpt: Since the discovery of the Higgs boson in 2012, the diphoton ([gamma][gamma]) decay channel of the Higgs boson has been one of the most potent channels due to the contrast between the smoothly falling background and sharply peaked signal in the diphoton invariant mass. In 2018, with up to 80 fb-1 of data at [square root]s = 13 TeV, ATLAS observed Higgs boson production in association with a pair of top quarks (ttH) with a significance of 5.8 [sigma] by combining measurements in the [gamma][gamma], bb, ZZ, and multi-lepton Higgs decay channels. The ttH production cross-section was measured to be 670 [plus or minus] 90 (stat) +110 -100 (syst) fb. The diphoton channel was one of the main contributors to this result, alone providing a significance of 4.1 [sigma]. With 140 fb-1, a search for non-resonant Higgs pair production in the bb[gamma][gamma] final state was performed. No significant signal was observed and upper limits at 95% confidence level were set. The observed limit on the SM cross-section was 130 fb, or 4.2 times the predicted value. The observed Higgs trilinear coupling modifier was constrained to be between [-1.5, 6.7]. Both the ttH (H [rightwards arrow] [gamma][gamma]) and HH bb[gamma][gamma] analyses will benefit tremendously from the increased statistics expected from the High-Luminosity LHC (HL-LHC). To ensure the continued efficiency of the detector in the harsh HL-LHC environment, ATLAS will install a new Inner Tracker (ITk) consisting of silicon pixel sensors in its innermost layer. At SLAC National Accelerator Laboratory, a variety of electrical tests are performed for the construction of a prototype integrated pixel system, in order to provide early feedback and validation of the ITk design.

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