A. Arhrib, R. Benbrik, M. Berrouj, M. Boukidi, B. Manaut
{"title":"Search for charged Higgs bosons through vectorlike top quark pair production at the LHC","authors":"A. Arhrib, R. Benbrik, M. Berrouj, M. Boukidi, B. Manaut","doi":"10.1103/physrevd.111.095026","DOIUrl":null,"url":null,"abstract":"We investigate the discovery prospects for a vectorlike top partner (VLT) in the type-II two-Higgs-doublet model (2HDM-II) extended by a vectorlike quark doublet (T</a:mi>B</a:mi></a:math>) at the 14 TeV LHC. The study focuses on the pair production process <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mi>p</c:mi><c:mi>p</c:mi><c:mo stretchy=\"false\">→</c:mo><c:mi>T</c:mi><c:mover accent=\"true\"><c:mi>T</c:mi><c:mo stretchy=\"false\">¯</c:mo></c:mover><c:mo stretchy=\"false\">→</c:mo><c:mi>b</c:mi><c:msup><c:mi>H</c:mi><c:mo>+</c:mo></c:msup><c:mover accent=\"true\"><c:mi>b</c:mi><c:mo stretchy=\"false\">¯</c:mo></c:mover><c:msup><c:mi>H</c:mi><c:mo>−</c:mo></c:msup><c:mo stretchy=\"false\">→</c:mo><c:mi>b</c:mi><c:mo stretchy=\"false\">(</c:mo><c:mi>t</c:mi><c:mi>b</c:mi><c:mo stretchy=\"false\">)</c:mo><c:mover accent=\"true\"><c:mi>b</c:mi><c:mo stretchy=\"false\">¯</c:mo></c:mover><c:mo stretchy=\"false\">(</c:mo><c:mover accent=\"true\"><c:mi>t</c:mi><c:mo stretchy=\"false\">¯</c:mo></c:mover><c:mi>b</c:mi><c:mo stretchy=\"false\">)</c:mo></c:math>, yielding fully hadronic final states characterized by high <t:math xmlns:t=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><t:mi>b</t:mi></t:math>-jet multiplicity. Two analysis strategies are employed, requiring at least four or five <v:math xmlns:v=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><v:mi>b</v:mi></v:math>-tagged jets (<x:math xmlns:x=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><x:mrow><x:mn>4</x:mn><x:mi>b</x:mi></x:mrow></x:math> and <z:math xmlns:z=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><z:mrow><z:mn>5</z:mn><z:mi>b</z:mi></z:mrow></z:math>), to exploit the signal topology. Assuming a charged Higgs mass of <bb:math xmlns:bb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><bb:msub><bb:mi>m</bb:mi><bb:msup><bb:mi>H</bb:mi><bb:mo>±</bb:mo></bb:msup></bb:msub><bb:mo>∼</bb:mo><bb:mn>600</bb:mn><bb:mtext> </bb:mtext><bb:mtext> </bb:mtext><bb:mi>GeV</bb:mi></bb:math> and a systematic uncertainty of <db:math xmlns:db=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><db:mi>δ</db:mi><db:mo>=</db:mo><db:mn>5</db:mn><db:mo>%</db:mo></db:math>, the <fb:math xmlns:fb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><fb:mrow><fb:mn>4</fb:mn><fb:mi>b</fb:mi></fb:mrow></fb:math> channel enables discovery up to <hb:math xmlns:hb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><hb:msub><hb:mi>m</hb:mi><hb:mi>T</hb:mi></hb:msub><hb:mo>∼</hb:mo><hb:mn>1200</hb:mn><hb:mtext> </hb:mtext><hb:mtext> </hb:mtext><hb:mi>GeV</hb:mi></hb:math> at <jb:math xmlns:jb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><jb:mi mathvariant=\"script\">L</jb:mi><jb:mo>=</jb:mo><jb:mn>300</jb:mn><jb:mtext> </jb:mtext><jb:mtext> </jb:mtext><jb:msup><jb:mi>fb</jb:mi><jb:mrow><jb:mo>−</jb:mo><jb:mn>1</jb:mn></jb:mrow></jb:msup></jb:math>, while the <mb:math xmlns:mb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mb:mrow><mb:mn>5</mb:mn><mb:mi>b</mb:mi></mb:mrow></mb:math> analysis extends the reach to <ob:math xmlns:ob=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><ob:msub><ob:mi>m</ob:mi><ob:mi>T</ob:mi></ob:msub><ob:mo>∼</ob:mo><ob:mn>1300</ob:mn><ob:mtext> </ob:mtext><ob:mtext> </ob:mtext><ob:mi>GeV</ob:mi></ob:math>. At higher luminosities of <qb:math xmlns:qb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><qb:mrow><qb:mn>1000</qb:mn><qb:mi>–</qb:mi><qb:mn>3000</qb:mn><qb:mtext> </qb:mtext><qb:mtext> </qb:mtext><qb:msup><qb:mi>fb</qb:mi><qb:mrow><qb:mo>−</qb:mo><qb:mn>1</qb:mn></qb:mrow></qb:msup></qb:mrow></qb:math>, the <sb:math xmlns:sb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><sb:mrow><sb:mn>5</sb:mn><sb:mi>b</sb:mi></sb:mrow></sb:math> strategy achieves discovery sensitivity up to <ub:math xmlns:ub=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><ub:msub><ub:mi>m</ub:mi><ub:mi>T</ub:mi></ub:msub><ub:mo>∼</ub:mo><ub:mn>1400</ub:mn><ub:mtext> </ub:mtext><ub:mtext> </ub:mtext><ub:mi>GeV</ub:mi></ub:math>. The reach is significantly reduced as <wb:math xmlns:wb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><wb:msub><wb:mi>m</wb:mi><wb:msup><wb:mi>H</wb:mi><wb:mo>±</wb:mo></wb:msup></wb:msub></wb:math> increases, due to the suppression of the <yb:math xmlns:yb=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><yb:mi>BR</yb:mi><yb:mo stretchy=\"false\">(</yb:mo><yb:mi>T</yb:mi><yb:mo stretchy=\"false\">→</yb:mo><yb:msup><yb:mi>H</yb:mi><yb:mo>+</yb:mo></yb:msup><yb:mi>b</yb:mi><yb:mo stretchy=\"false\">)</yb:mo></yb:math>: for <dc:math xmlns:dc=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><dc:msub><dc:mi>m</dc:mi><dc:msup><dc:mi>H</dc:mi><dc:mo>±</dc:mo></dc:msup></dc:msub><dc:mo>∼</dc:mo><dc:mn>1000</dc:mn><dc:mtext> </dc:mtext><dc:mtext> </dc:mtext><dc:mi>GeV</dc:mi></dc:math>, discovery becomes unattainable across all luminosity and systematic uncertainty configurations. Sensitivity is also strongly impacted by systematic uncertainties: for <fc:math xmlns:fc=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><fc:mi>δ</fc:mi><fc:mo>=</fc:mo><fc:mn>10</fc:mn><fc:mo>%</fc:mo></fc:math> and <hc:math xmlns:hc=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><hc:msub><hc:mi>m</hc:mi><hc:msup><hc:mi>H</hc:mi><hc:mo>±</hc:mo></hc:msup></hc:msub><hc:mo><</hc:mo><hc:mspace linebreak=\"goodbreak\"/><hc:mn>1000</hc:mn><hc:mtext> </hc:mtext><hc:mtext> </hc:mtext><hc:mi>GeV</hc:mi></hc:math>, discovery remains viable up to <kc:math xmlns:kc=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><kc:msub><kc:mi>m</kc:mi><kc:mi>T</kc:mi></kc:msub><kc:mo>∼</kc:mo><kc:mn>1200</kc:mn><kc:mtext> </kc:mtext><kc:mtext> </kc:mtext><kc:mi>GeV</kc:mi></kc:math> in the <mc:math xmlns:mc=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><mc:mrow><mc:mn>5</mc:mn><mc:mi>b</mc:mi></mc:mrow></mc:math> analysis, while for <oc:math xmlns:oc=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><oc:mi>δ</oc:mi><oc:mo>=</oc:mo><oc:mn>20</oc:mn><oc:mo>%</oc:mo></oc:math>, no discovery is achievable for <qc:math xmlns:qc=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><qc:msub><qc:mi>m</qc:mi><qc:mi>T</qc:mi></qc:msub><qc:mo>≥</qc:mo><qc:mn>1000</qc:mn><qc:mtext> </qc:mtext><qc:mtext> </qc:mtext><qc:mi>GeV</qc:mi></qc:math>. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"130 1","pages":""},"PeriodicalIF":5.3000,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review D","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/physrevd.111.095026","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Physics and Astronomy","Score":null,"Total":0}
引用次数: 0
Abstract
We investigate the discovery prospects for a vectorlike top partner (VLT) in the type-II two-Higgs-doublet model (2HDM-II) extended by a vectorlike quark doublet (TB) at the 14 TeV LHC. The study focuses on the pair production process pp→TT¯→bH+b¯H−→b(tb)b¯(t¯b), yielding fully hadronic final states characterized by high b-jet multiplicity. Two analysis strategies are employed, requiring at least four or five b-tagged jets (4b and 5b), to exploit the signal topology. Assuming a charged Higgs mass of mH±∼600GeV and a systematic uncertainty of δ=5%, the 4b channel enables discovery up to mT∼1200GeV at L=300fb−1, while the 5b analysis extends the reach to mT∼1300GeV. At higher luminosities of 1000–3000fb−1, the 5b strategy achieves discovery sensitivity up to mT∼1400GeV. The reach is significantly reduced as mH± increases, due to the suppression of the BR(T→H+b): for mH±∼1000GeV, discovery becomes unattainable across all luminosity and systematic uncertainty configurations. Sensitivity is also strongly impacted by systematic uncertainties: for δ=10% and mH±<1000GeV, discovery remains viable up to mT∼1200GeV in the 5b analysis, while for δ=20%, no discovery is achievable for mT≥1000GeV. Published by the American Physical Society2025
期刊介绍：
Physical Review D (PRD) is a leading journal in elementary particle physics, field theory, gravitation, and cosmology and is one of the top-cited journals in high-energy physics.
PRD covers experimental and theoretical results in all aspects of particle physics, field theory, gravitation and cosmology, including:
Particle physics experiments,
Electroweak interactions,
Strong interactions,
Lattice field theories, lattice QCD,
Beyond the standard model physics,
Phenomenological aspects of field theory, general methods,
Gravity, cosmology, cosmic rays,
Astrophysics and astroparticle physics,
General relativity,
Formal aspects of field theory, field theory in curved space,
String theory, quantum gravity, gauge/gravity duality.
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号
