Nuclear and Particle Physics Proceedings最新文献

Recent results on hadron spectroscopy at LHCb 大型强子对撞机b的强子光谱学最新成果

Nuclear and Particle Physics Proceedings Pub Date : 2024-11-12 DOI: 10.1016/j.nuclphysbps.2024.11.001

Liming Zhang

引用次数: 0

A gauge-invariant measure for gauge fields on CP2 CP2 上规量场的规不变度量

Nuclear and Particle Physics Proceedings Pub Date : 2024-10-28 DOI: 10.1016/j.nuclphysbps.2024.10.006

Antonina Maj

{"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":"2024-10-28","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}

引用次数: 0

Recent results and upgrade of the ALICE muon spectrometer ALICE µ子光谱仪的最新成果和升级换代

Nuclear and Particle Physics Proceedings Pub Date : 2024-10-28 DOI: 10.1016/j.nuclphysbps.2024.10.008

Luca Quaglia, ALICE collaboration

{"title":"Recent results and upgrade of the ALICE muon spectrometer","authors":"Luca Quaglia, 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 < y < 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":"2024-10-28","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}

引用次数: 0

QCD chemistry: Remarks on diquarks QCD 化学：关于二夸克的评论

Nuclear and Particle Physics Proceedings Pub Date : 2024-10-28 DOI: 10.1016/j.nuclphysbps.2024.10.007

Mikhail Shifman

引用次数: 0

π-π scattering lengths: Electric corrections in the linear sigma model π-π散射长度：线性西格玛模型中的电校正

Nuclear and Particle Physics Proceedings Pub Date : 2024-10-28 DOI: 10.1016/j.nuclphysbps.2024.10.005

M. Loewe , R. Cádiz , R. Zamora

引用次数: 0

Light scalar quarkonia from Laplace sum rule at NLO 从拉普拉斯求和规则看 NLO 时的轻标量夸克态

Nuclear and Particle Physics Proceedings Pub Date : 2024-10-18 DOI: 10.1016/j.nuclphysbps.2024.10.004

R.M. Albuquerque , S. Narison , D. Rabetiarivony

{"title":"Light scalar quarkonia from Laplace sum rule at NLO","authors":"R.M. Albuquerque , S. Narison , D. Rabetiarivony","doi":"10.1016/j.nuclphysbps.2024.10.004","DOIUrl":"10.1016/j.nuclphysbps.2024.10.004","url":null,"abstract":"<div><div>We review our results on light scalar quarkonia (<span><math><mover><mrow><mi>q</mi></mrow><mrow><mo>¯</mo></mrow></mover><mi>q</mi></math></span> and four-quark states) from (inverse) QCD Laplace sum rules (LSR) and their ratios <span><math><mi>R</mi></math></span> within stability criteria and including higher order perturbative (PT) corrections up to the (estimated) <span><math><mi>O</mi><mo>(</mo><msubsup><mrow><mi>α</mi></mrow><mrow><mi>s</mi></mrow><mrow><mn>5</mn></mrow></msubsup><mo>)</mo></math></span>. As the Operator Product Expansion (OPE) usually converges for <span><math><mi>D</mi><mo>⩽</mo><mn>6</mn><mo>−</mo><mn>8</mn></math></span>, we evaluated the QCD spectral functions at Lowest Order (LO) of PT QCD and up to the <span><math><mi>D</mi><mo>=</mo><mn>6</mn></math></span> dimension vaccum condensates. We request that the optimal results obey the constraint: Pole (Resonance) contribution to the spectral integral is larger than the QCD continuum one which excludes an on-shell mass around <span><math><mo>(</mo><mn>500</mn><mo>−</mo><mn>600</mn><mo>)</mo><mspace></mspace><mtext>MeV</mtext></math></span> obtained for values of the QCD continuum threshold <span><math><msub><mrow><mi>t</mi></mrow><mrow><mi>c</mi></mrow></msub><mo>⩽</mo><mo>(</mo><mn>1</mn><mo>∼</mo><mn>1.5</mn><mo>)</mo><mspace></mspace><msup><mrow><mtext>GeV</mtext></mrow><mrow><mn>2</mn></mrow></msup></math></span>. Our results for the different assignments of the scalar mesons are compiled in Tables 1 to 3.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 68-74"},"PeriodicalIF":0.0,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142554622","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}

引用次数: 0

Exotics searches at ATLAS 在 ATLAS 进行外来物种搜索

Nuclear and Particle Physics Proceedings Pub Date : 2024-10-18 DOI: 10.1016/j.nuclphysbps.2024.10.003

Kristina Mihule, ATLAS Collaboration

引用次数: 0

Recent highlights from the BELLE and BELLE II experiments BELLE 和 BELLE II 实验的最新亮点

Nuclear and Particle Physics Proceedings Pub Date : 2024-10-18 DOI: 10.1016/j.nuclphysbps.2024.10.002

Yubo Han, BELLE and BELLE II Collaborations

{"title":"Recent highlights from the BELLE and BELLE II experiments","authors":"Yubo Han, 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":"2024-10-18","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}

引用次数: 0

Bjorken polarised sum rule with IR-finite QCD coupling 具有红外无限 QCD 耦合的 Bjorken 极化和则

Nuclear and Particle Physics Proceedings Pub Date : 2024-10-08 DOI: 10.1016/j.nuclphysbps.2024.09.003

César Ayala , Camilo Castro-Arriaza , Gorazd Cvetič

{"title":"Bjorken polarised sum rule with IR-finite QCD coupling","authors":"César Ayala , Camilo Castro-Arriaza , Gorazd Cvetič","doi":"10.1016/j.nuclphysbps.2024.09.003","DOIUrl":"10.1016/j.nuclphysbps.2024.09.003","url":null,"abstract":"<div><div>We evaluate the Bjorken polarised sum rule (BSR) <span><math><msubsup><mrow><mover><mrow><mi>Γ</mi></mrow><mo>‾</mo></mover></mrow><mrow><mn>1</mn></mrow><mrow><mi>p</mi><mo>−</mo><mi>n</mi></mrow></msubsup><mo>(</mo><msup><mrow><mi>Q</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>)</mo></math></span> with truncated Operator Product Expansion (OPE) up to the dimension <span><math><mi>D</mi><mo>=</mo><mn>4</mn></math></span> terms; the leading-twist (<span><math><mi>D</mi><mo>=</mo><mn>0</mn></math></span>) contribution is evaluated with a renormalon motivated resummation, where we use the IR-finite running coupling free of Landau singularities. The free residue parameters at the <span><math><mi>D</mi><mo>=</mo><mn>2</mn></math></span> and <span><math><mi>D</mi><mo>=</mo><mn>4</mn></math></span> terms are then extracted by fits to the experimental BSR data. In comparison to the case when perturbative QCD coupling is used in this approach (cf. Refs. <span><span>[1]</span></span>, <span><span>[2]</span></span>), many advantages become manifest in the present case: (a) no regularisation in the resummation integral is needed; (b) the <span><math><msup><mrow><mi>Q</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span>-interval in the fit can be significantly extended to lower <span><math><msup><mrow><mi>Q</mi></mrow><mrow><mn>2</mn></mrow></msup></math></span>-values; (c) the extracted residue parameter values are more stable, this being reflected in the significantly reduced experimental uncertainties of these values and the suppressed (almost negligible) central extracted value of the <span><math><mi>D</mi><mo>=</mo><mn>4</mn></math></span> residue parameter (<span><math><msub><mrow><mi>μ</mi></mrow><mrow><mn>6</mn></mrow></msub></math></span>).</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 32-36"},"PeriodicalIF":0.0,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142434016","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}

引用次数: 0

Towards few-body QCD on a quantum computer 在量子计算机上实现少数体 QCD

Nuclear and Particle Physics Proceedings Pub Date : 2024-10-08 DOI: 10.1016/j.nuclphysbps.2024.10.001

J.J. Gálvez-Viruet

引用次数: 0