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Search for Exotic Higgs Boson Decays With CMS and Fast Machine Learning Solutions for the LHC
Search for Exotic Higgs Boson Decays With CMS and Fast Machine Learning Solutions for the ...
Search for Exotic Higgs Boson Decays With CMS and Fast Machine Learning Solutions for the LHC

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211152726
ISBN  
9798383599860
DDC  
530
저자명  
Tsoi, Ho Fung.
서명/저자  
Search for Exotic Higgs Boson Decays With CMS and Fast Machine Learning Solutions for the LHC
발행사항  
[Sl] : The University of Wisconsin - Madison, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
204 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
주기사항  
Advisor: Dasu, Sridhara.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
초록/해제  
요약There exists potential for discoveries beyond the Standard Model in scalar sector, which could manifest as Higgs boson exotic decays into new light pseudoscalars. This search targets such decays, focusing on pseudoscalar masses ranging from 12 to 60 GeV, in final states where one pseudoscalar decays into two b quarks and the other into two τ leptons or two muons. The analysis is based on a dataset of proton-proton collisions at √s = 13 TeV, collected by the CMS detector during LHC Run 2, with an integrated luminosity of 138 fb−1 . Dedicated neural networks are used to distinguish between signal and background, significantly enhancing sensitivity. The results are presented as exclusion limits at 95% confidence level on the model-independent branching ratio and are interpreted within two-Higgs doublet models augmented by a singlet.The second part of this thesis presents machine learning methods to enhance overall sensitivity in the low-latency domain for the LHC experiments. A novel machine learning-based trigger algorithm is developed, using anomaly detection to search for new physics in a model-agnostic manner as close to the raw collision data as possible. This anomaly detection trigger is sensitive to a wide range of both conventional and unconventional physics signatures and has an inference latency of O(100) ns on an FPGA. It is deployed during Run 3 in the CMS Level-1 trigger system, which processes the first round of real-time event selection from collision data at a rate of 40 MHz. Additionally, a novel model compression method using symbolic regression is developed to accelerate machine learning inference to nanosecond speeds on FPGAs. This method demonstrates potential to significantly reduce the computational costs of machine learning algorithms while maintaining performance comparable to that of neural networks. These advancements are crucial for meeting the sensitivity and computational demands of resource-constrained environments such as the LHC experiments.
일반주제명  
Physics
일반주제명  
Applied physics
일반주제명  
Nuclear physics
키워드  
Pseudoscalars
키워드  
Exotic decays
키워드  
Higgs boson
키워드  
Machine learning
키워드  
Anomaly detection
기타저자  
The University of Wisconsin - Madison Physics
기본자료저록  
Dissertations Abstracts International. 86-02B.
전자적 위치 및 접속  
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MARC

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■020    ▼a9798383599860
■035    ▼a(MiAaPQ)AAI31490271
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aTsoi,  Ho  Fung.
■24510▼aSearch  for  Exotic  Higgs  Boson  Decays  With  CMS  and  Fast  Machine  Learning  Solutions  for  the  LHC
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a204  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-02,  Section:  B.
■500    ▼aAdvisor:  Dasu,  Sridhara.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2024.
■520    ▼aThere  exists  potential  for  discoveries  beyond  the  Standard  Model  in  scalar  sector,  which  could  manifest  as  Higgs  boson  exotic  decays  into  new  light  pseudoscalars.  This  search  targets  such  decays,  focusing  on  pseudoscalar  masses  ranging  from  12  to  60  GeV,  in  final  states  where  one  pseudoscalar  decays  into  two  b  quarks  and  the  other  into  two  τ  leptons  or  two  muons.  The  analysis  is  based  on  a  dataset  of  proton-proton  collisions  at  √s  =  13  TeV,  collected  by  the  CMS  detector  during  LHC  Run  2,  with  an  integrated  luminosity  of  138  fb−1  .  Dedicated  neural  networks  are  used  to  distinguish  between  signal  and  background,  significantly  enhancing  sensitivity.  The  results  are  presented  as  exclusion  limits  at  95%  confidence  level  on  the  model-independent  branching  ratio  and  are  interpreted  within  two-Higgs  doublet  models  augmented  by  a  singlet.The  second  part  of  this  thesis  presents  machine  learning  methods  to  enhance  overall  sensitivity  in  the  low-latency  domain  for  the  LHC  experiments.  A  novel  machine  learning-based  trigger  algorithm  is  developed,  using  anomaly  detection  to  search  for  new  physics  in  a  model-agnostic  manner  as  close  to  the  raw  collision  data  as  possible.  This  anomaly  detection  trigger  is  sensitive  to  a  wide  range  of  both  conventional  and  unconventional  physics  signatures  and  has  an  inference  latency  of  O(100)  ns  on  an  FPGA.  It  is  deployed  during  Run  3  in  the  CMS  Level-1  trigger  system,  which  processes  the  first  round  of  real-time  event  selection  from  collision  data  at  a  rate  of  40  MHz.  Additionally,  a  novel  model  compression  method  using  symbolic  regression  is  developed  to  accelerate  machine  learning  inference  to  nanosecond  speeds  on  FPGAs.  This  method  demonstrates  potential  to  significantly  reduce  the  computational  costs  of  machine  learning  algorithms  while  maintaining  performance  comparable  to  that  of  neural  networks.  These  advancements  are  crucial  for  meeting  the  sensitivity  and  computational  demands  of  resource-constrained  environments  such  as  the  LHC  experiments.
■590    ▼aSchool  code:  0262.
■650  4▼aPhysics
■650  4▼aApplied  physics
■650  4▼aNuclear  physics
■653    ▼aPseudoscalars
■653    ▼aExotic  decays
■653    ▼aHiggs  boson
■653    ▼aMachine  learning
■653    ▼aAnomaly  detection
■690    ▼a0605
■690    ▼a0756
■690    ▼a0215
■71020▼aThe  University  of  Wisconsin  -  Madison▼bPhysics.
■7730  ▼tDissertations  Abstracts  International▼g86-02B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163579▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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