Nuclear and Particle Physics Proceedings最新文献

{"title":"aμ|l.ohvp, QCD power corrections and αs from e+e− → Hadrons","authors":"Stephan Narison","doi":"10.1016/j.nuclphysbps.2024.11.007","DOIUrl":"10.1016/j.nuclphysbps.2024.11.007","url":null,"abstract":"<div><div>In this talk, I review the results obtained recently in Ref. <span><span>[1]</span></span>. <em>First,</em> we estimate the LO hadronic vacuum polarization contribution to the muon and <em>τ</em> anomalous magnetic moments to be: <span><math><msub><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow></msub><msubsup><mrow><mo>|</mo></mrow><mrow><mi>l</mi><mo>.</mo><mi>o</mi></mrow><mrow><mi>h</mi><mi>v</mi><mi>p</mi></mrow></msubsup><mo>=</mo><mo>(</mo><mn>7036.5</mn><mo>±</mo><mn>38.9</mn><mo>)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>11</mn></mrow></msup></math></span>, <span><math><msub><mrow><mi>a</mi></mrow><mrow><mi>τ</mi></mrow></msub><msubsup><mrow><mo>|</mo></mrow><mrow><mi>l</mi><mo>.</mo><mi>o</mi></mrow><mrow><mi>h</mi><mi>v</mi><mi>p</mi></mrow></msubsup><mo>=</mo><mo>(</mo><mn>3494.8</mn><mo>±</mo><mn>24.7</mn><mo>)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>9</mn></mrow></msup></math></span> (see Table 1) leading to: <span><math><mi>Δ</mi><msub><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow></msub><mo>≡</mo><msubsup><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow><mrow><mi>e</mi><mi>x</mi><mi>p</mi></mrow></msubsup><mo>−</mo><msubsup><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow><mrow><mi>S</mi><mi>M</mi></mrow></msubsup><mo>=</mo><mo>(</mo><mn>143</mn><mo>±</mo><msub><mrow><mn>42</mn></mrow><mrow><mi>t</mi><mi>h</mi></mrow></msub><mo>±</mo><msub><mrow><mn>22</mn></mrow><mrow><mi>e</mi><mi>x</mi><mi>p</mi></mrow></msub><mo>)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>11</mn></mrow></msup></math></span> which is about 3<em>σ</em> discrepancy between the SM predictions and experiment. One also finds: <span><math><msup><mrow><mi>α</mi></mrow><mrow><mo>(</mo><mn>5</mn><mo>)</mo></mrow></msup><mo>(</mo><msub><mrow><mi>M</mi></mrow><mrow><mi>Z</mi></mrow></msub><mo>)</mo><msub><mrow><mo>|</mo></mrow><mrow><mi>h</mi><mi>a</mi><mi>d</mi></mrow></msub><mo>=</mo><mo>(</mo><mn>2766.3</mn><mo>±</mo><mn>4.5</mn><mo>)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>5</mn></mrow></msup></math></span>. <em>Second,</em> we estimate the QCD power corrections up to dimension 20 from the ratio of Laplace sum rule and from <em>τ</em>-like decay high moments (see Table 3). We do not observe any exponential growth of their size which may not favour a duality violation of the spectral function. We obtain <span><math><mo>〈</mo><msub><mrow><mi>α</mi></mrow><mrow><mi>s</mi></mrow></msub><msup><mrow><mi>G</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>〉</mo><mo>=</mo><mo>(</mo><mn>7.8</mn><mo>±</mo><mn>3.5</mn><mo>)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup><mspace></mspace><msup><mrow><mtext>GeV</mtext></mrow><mrow><mn>4</mn></mrow></msup></math></span> in agreement with the more precise one from heavy quark sum rules, while <span><math><mi>ρ</mi><msub><mrow><mi>α</mi></mrow><mrow><mi>s</mi></mrow></msub><msup><mrow><mo>〈</mo><mover><mrow><","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 105-115"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bounds on aμHVP,LO using Hölder's inequalities and finite-energy QCD sum rules","authors":"Siyuan Li ,&nbsp;T.G. Steele ,&nbsp;J. Ho ,&nbsp;R. Raza ,&nbsp;K. Williams ,&nbsp;R.T. Kleiv","doi":"10.1016/j.nuclphysbps.2024.09.002","DOIUrl":"10.1016/j.nuclphysbps.2024.09.002","url":null,"abstract":"<div><div>This study establishes bounds on the leading-order (LO) hadronic vacuum polarization (HVP) contribution to the anomalous magnetic moment of the muon (<span><math><msubsup><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow><mrow><mi>HVP</mi><mo>,</mo><mi>LO</mi></mrow></msubsup></math></span>, <span><math><msub><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow></msub><mo>=</mo><msub><mrow><mo>(</mo><mi>g</mi><mo>−</mo><mn>2</mn><mo>)</mo></mrow><mrow><mi>μ</mi></mrow></msub><mo>/</mo><mn>2</mn></math></span>) by using Hölder's inequality and related inequalities in Finite-Energy QCD sum rules. Considering contributions from light quarks (<span><math><mi>u</mi><mo>,</mo><mi>d</mi><mo>,</mo><mi>s</mi></math></span>) up to five-loop order in perturbation theory within the chiral limit, leading-order light-quark mass corrections, next-to-leading order for dimension-four QCD condensates, and leading-order for dimension-six QCD condensates, the study finds QCD lower and upper bounds as <span><math><mrow><mo>(</mo><mn>657.0</mn><mo>±</mo><mn>34.8</mn><mo>)</mo></mrow><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>10</mn></mrow></msup><mo>≤</mo><msubsup><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow><mrow><mi>HVP</mi><mo>,</mo><mi>LO</mi></mrow></msubsup><mo>≤</mo><mrow><mo>(</mo><mn>788.4</mn><mo>±</mo><mn>41.8</mn><mo>)</mo></mrow><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>10</mn></mrow></msup></math></span>.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 6-11"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exotics searches at ATLAS","authors":"Kristina Mihule,&nbsp;ATLAS Collaboration","doi":"10.1016/j.nuclphysbps.2024.10.003","DOIUrl":"10.1016/j.nuclphysbps.2024.10.003","url":null,"abstract":"<div><div>Many theories beyond the Standard Model (SM) have been proposed to address several SM shortcomings, such as explaining why the Higgs boson is so light, the origin of neutrino masses, or the observed pattern of masses and mixing angles in the quark and lepton sectors. These beyond-the-SM extensions predict new particles or interactions directly accessible at the LHC. These proceedings will highlight recent searches based on the full Run 2 data collected by the ATLAS detector at the LHC with a centre-of-mass energy of 13 TeV.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 43-51"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Closing Address—QCD24 Proceedings","authors":"Stephan Narison","doi":"10.1016/j.nuclphysbps.2024.11.004","DOIUrl":"10.1016/j.nuclphysbps.2024.11.004","url":null,"abstract":"","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Page 94"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent results and upgrade of the ALICE muon spectrometer","authors":"Luca Quaglia,&nbsp;ALICE collaboration","doi":"10.1016/j.nuclphysbps.2024.10.008","DOIUrl":"10.1016/j.nuclphysbps.2024.10.008","url":null,"abstract":"<div><div>The ALICE experiment at the CERN Large Hadron Collider (LHC) is a multi-purpose particle detector, mainly focused on the study of quark-gluon plasma (QGP) in heavy-ion collisions. In the forward rapidity region, 2.5 &lt; y &lt; 4, ALICE is equipped with a muon spectrometer (MS), which allows to study quarkonia and open heavy-flavor particles, both key probes to investigate QGP properties.</div><div>Although in LHC Run 1 and 2 many important results were achieved, the front absorber of the MS represented a limit to the physics program, due to the multiple scattering and energy loss in the material. To assess this limitation, a new forward vertex tracker (Muon Forward Tracker, MFT) was installed between the inner tracking system (ITS) and the front absorber. This has enhanced the MS physics performance, enabling the separation of prompt/non-prompt charmonium production at forward rapidity. It will also allow one to reduce the combinatorial background from semi-leptonic decays of kaons and pions. Finally, it will greatly improve the invariant-mass resolution of the low-mass dimuon pairs.</div><div>Moreover, during the ongoing LHC Run 3, the rate of Pb–Pb collisions has been increased from 10 kHz (in Run 2) up to 50 kHz, allowing to collect a data sample about 5 times larger than the one recorded in Run 2.</div><div>This contribution will provide a brief overview of the MS upgrades and it will focus on the expected physics performance during the LHC Run 3. Some of the preliminary results already obtained will also be shown.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 75-81"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A gauge-invariant measure for gauge fields on CP2","authors":"Antonina Maj","doi":"10.1016/j.nuclphysbps.2024.10.006","DOIUrl":"10.1016/j.nuclphysbps.2024.10.006","url":null,"abstract":"<div><div>We consider four-dimensional non-Abelian gauge theory living on a complex projective space <span><math><msup><mrow><mi>CP</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> as a way of gaining insights into (3+1)-dimensional QCD. In particular, we use a complex parametrization of gauge fields on which gauge transformations act homogeneously. This allows us to factor out the gauge degrees of freedom from the volume element leading to a manifestly gauge-invariant measure for the gauge-orbit space (the space of all gauge potentials modulo gauge transformations). The terms appearing in the measure that are of particular interest are mass-like terms for the gauge-invariant modes of the gauge fields. Since these mass terms come with dimensional parameters they are significant in the context of dimensional transmutation. Moreover, the existence of local gauge-invariant mass terms on <span><math><msup><mrow><mi>CP</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span> could be related to Schwinger-Dyson calculations of the soft gluon mass. Finally, we argue that there is a kinematic regime in which the theory can be approximated by a 4d Wess-Zumino-Witten (WZW) theory. This result can be used to draw similarities between the mechanism of confinement in four and (2+1) dimensions.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 62-67"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent highlights from the BELLE and BELLE II experiments","authors":"Yubo Han,&nbsp;BELLE and BELLE II Collaborations","doi":"10.1016/j.nuclphysbps.2024.10.002","DOIUrl":"10.1016/j.nuclphysbps.2024.10.002","url":null,"abstract":"<div><div>The BELLE experiment at the KEKB collider in Tsukuba operated as a B-factory until 2018, making significant contributions to flavor physics. Building on this legacy, the BELLE II experiment, an upgraded version, now operates at the SuperKEKB energy-asymmetric <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> collider. BELLE II has collected <span><math><mn>424</mn><mspace></mspace><msup><mrow><mtext>fb</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> of data, including <span><math><mn>365</mn><mspace></mspace><msup><mrow><mtext>fb</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> at the <span><math><mi>ϒ</mi><mo>(</mo><mn>4</mn><mi>S</mi><mo>)</mo></math></span> resonance. A wide range of physics topics can be studies with this data. In this proceeding, we review our latest results, which include tests of lepton flavor universality, Cabibbo-Kobayashi-Maskawa physics, searches for rare <em>B</em>-meson decays, and spectroscopy studies. We also discuss contributions to the <span><math><msub><mrow><mi>g</mi></mrow><mrow><mi>μ</mi></mrow></msub><mo>−</mo><mn>2</mn></math></span> prediction.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 52-61"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142530912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"QCD chemistry: Remarks on diquarks","authors":"Mikhail Shifman","doi":"10.1016/j.nuclphysbps.2024.10.007","DOIUrl":"10.1016/j.nuclphysbps.2024.10.007","url":null,"abstract":"<div><div>I review the status of “good diquarks” in light-quark hadronic structure and argue that the heavy-light diquarks play no role in the structure of <em>b</em>-containing hadrons (including exotics), and their role in <em>c</em>-containing hadrons is likely to be minimal if at all. I explain that a crucial phenomenological proof can be obtained from weak decays of <em>b</em>-containing hadrons, such <span><math><msub><mrow><mi>Λ</mi></mrow><mrow><mi>b</mi></mrow></msub></math></span>.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 86-89"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142577777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Towards few-body QCD on a quantum computer","authors":"J.J. Gálvez-Viruet","doi":"10.1016/j.nuclphysbps.2024.10.001","DOIUrl":"10.1016/j.nuclphysbps.2024.10.001","url":null,"abstract":"<div><div>Quantum computers are promising tools for the simulation of many-body systems, and among those, QCD stands out by its rich phenomenology. Every simulation starts with a codification, and here we succently review a newly developed compact encoding based on the identification between registers and particles; the quantum memory is divided into registers, and to each we associate a Hilbert space of dimension the number of degrees of freedom of the codified particles. In this way we gain an exponential compression over direct encodings for a low number of particles with many degrees of freedom. As an example we apply this encoding on a two-register memory and implement antisymmetrization and exponentiation algorithms.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 37-42"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Opening address - QCD24 Proceedings","authors":"Stephan Narison","doi":"10.1016/j.nuclphysbps.2024.11.003","DOIUrl":"10.1016/j.nuclphysbps.2024.11.003","url":null,"abstract":"","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 95-96"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142704371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}