Nuclear and Particle Physics Proceedings最新文献

Forward physics at LHC: Intersections with astrophysics 大型强子对撞机的前沿物理学：与天体物理学的交叉

Nuclear and Particle Physics Proceedings Pub Date : 2024-12-01 Epub Date: 2024-11-28 DOI: 10.1016/j.nuclphysbps.2024.11.006

Aldo Penzo

{"title":"Forward physics at LHC: Intersections with astrophysics","authors":"Aldo Penzo","doi":"10.1016/j.nuclphysbps.2024.11.006","DOIUrl":"10.1016/j.nuclphysbps.2024.11.006","url":null,"abstract":"<div><div>LHC pp collisions at <span><math><msqrt><mrow><mi>s</mi></mrow></msqrt><mo>=</mo><mn>14</mn><mspace></mspace><mrow><mi>TeV</mi></mrow></math></span> correspond to <span><math><msup><mrow><mn>10</mn></mrow><mrow><mn>17</mn></mrow></msup><mspace></mspace><mrow><mi>eV</mi></mrow></math></span> in the cosmic ray spectrum, reaching regions (f.i. the “knee”) whose interpretation is still debated, and whose models may be strongly influenced by LHC results on forward hadronic production, for instance as measured with CMS forward calorimeters. Other astrophysics problems that may receive a decisive input from LHC, and in particular HL-LHC, concern the interpretation of dark matter and dark energy in the universe, in correspondence with BSM (Beyond Standard Model) particles that may be detected as LLP (Long-Lived Particles). LLP searches have been generally done up to now at low pseudorapidity <em>η</em>, as exemplified by some CMS recent results. There may be however reasons why detectors in the forward direction of LHC experiments, could be better suited for these searches, at least for some lifetime ranges, due to large relativistic boosts of the produced particles at LHC energies in the forward region. Considering the CMS forward detectors, their role for some of these searches and corresponding signatures are discussed. Additional possibilities of instrumenting specific regions of the LHC tunnel near the interaction point IP5, where CMS is installed, are discussed.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 116-125"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142748550","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 : 2024-12-01 Epub 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":"2024-12-01","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

Preface - QCD 24 Proceedings 序言 - QCD 24 会议记录

Nuclear and Particle Physics Proceedings Pub Date : 2024-12-01 Epub Date: 2024-11-12 DOI: 10.1016/j.nuclphysbps.2024.11.002

Stephan Narison

引用次数: 0

QCD aspects in W and Z production with ATLAS 使用ATLAS进行W和Z生产的QCD方面的工作

Nuclear and Particle Physics Proceedings Pub Date : 2024-12-01 Epub Date: 2024-11-19 DOI: 10.1016/j.nuclphysbps.2024.11.005

Alberto Lorenzo Rescia , ATLAS Collaboration

引用次数: 0

HGTD DC/DC converter in low temperature and magnetic field operation 低温和磁场条件下的 HGTD DC/DC 转换器

Nuclear and Particle Physics Proceedings Pub Date : 2024-12-01 Epub Date: 2024-09-16 DOI: 10.1016/j.nuclphysbps.2024.08.008

Mingjie Zhai

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 : 2024-12-01 Epub 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":"2024-12-01","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

Towards heavy double-gluon hybrid mesons with exotic quantum numbers in QCD sum rules 在 QCD 和则中实现具有奇异量子数的重双胶子混合介子

Nuclear and Particle Physics Proceedings Pub Date : 2024-12-01 Epub Date: 2024-09-26 DOI: 10.1016/j.nuclphysbps.2024.09.004

Ding-Kun Lian , Qi-Nan Wang , Xu-Liang Chen , Peng-Fei Yang , Wei Chen , Hua-Xing Chen

{"title":"Towards heavy double-gluon hybrid mesons with exotic quantum numbers in QCD sum rules","authors":"Ding-Kun Lian , Qi-Nan Wang , Xu-Liang Chen , Peng-Fei Yang , Wei Chen , Hua-Xing Chen","doi":"10.1016/j.nuclphysbps.2024.09.004","DOIUrl":"10.1016/j.nuclphysbps.2024.09.004","url":null,"abstract":"<div><div>The double-gluon hybrid meson configuration was recently proposed and investigated within QCD sum rules. In this talk, we discuss the color structures of the double-gluon hybrid meson and construct current operators with exotic quantum numbers <span><math><msup><mrow><mi>J</mi></mrow><mrow><mi>P</mi><mi>C</mi></mrow></msup><mo>=</mo><msup><mrow><mn>1</mn></mrow><mrow><mo>−</mo><mo>+</mo></mrow></msup></math></span> and <span><math><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo><mo>−</mo></mrow></msup></math></span> for two of the structures. In the framework of QCD sum rules, we consider the condensates up to dimension-8 at the leading order of <span><math><msub><mrow><mi>α</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span> for both charmonium and the bottomonium systems. The results indicate that the masses of the <span><math><msup><mrow><mn>1</mn></mrow><mrow><mo>−</mo><mo>+</mo></mrow></msup></math></span> and <span><math><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo><mo>−</mo></mrow></msup></math></span> charmonium double-gluon hybrid mesons are approximately <span><math><mn>6.1</mn><mo>−</mo><mn>7.2</mn></math></span> GeV and <span><math><mn>6.3</mn><mo>−</mo><mn>6.4</mn></math></span> GeV, respectively. As for the bottomonium systems, their masses fall within the range of <span><math><mn>13.7</mn><mo>−</mo><mn>14.3</mn></math></span> GeV and <span><math><mn>12.6</mn><mo>−</mo><mn>13.3</mn></math></span> GeV for the <span><math><msup><mrow><mn>1</mn></mrow><mrow><mo>−</mo><mo>+</mo></mrow></msup></math></span> and <span><math><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo><mo>−</mo></mrow></msup></math></span> channels, respectively. Additionally, the charmonium hybrids could be produced in the radiative decays of bottomonium mesons in BelleII experiment.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 19-26"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357347","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

New BABAR studies for the data-driven predictions of the muon g − 2 针对μ介子 g - 2 数据驱动预测的新 BABAR 研究

Nuclear and Particle Physics Proceedings Pub Date : 2024-12-01 Epub Date: 2024-10-01 DOI: 10.1016/j.nuclphysbps.2024.09.001

Georges Vasseur

引用次数: 0

Investigation on the Ω(2012) from QCD sum rules 从 QCD 和则探究 Ω(2012)

Nuclear and Particle Physics Proceedings Pub Date : 2024-12-01 Epub Date: 2024-09-26 DOI: 10.1016/j.nuclphysbps.2024.09.006

Niu Su , Hua-Xing Chen , Philipp Gubler , Atsushi Hosaka

引用次数: 0

Study of intrinsic-kT in the Parton Branching Method 研究偏子分支法中的本征 kT

Nuclear and Particle Physics Proceedings Pub Date : 2024-12-01 Epub Date: 2024-09-26 DOI: 10.1016/j.nuclphysbps.2024.09.005

Nataša Raičević

{"title":"Study of intrinsic-kT in the Parton Branching Method","authors":"Nataša Raičević","doi":"10.1016/j.nuclphysbps.2024.09.005","DOIUrl":"10.1016/j.nuclphysbps.2024.09.005","url":null,"abstract":"<div><div>The work presented here focuses on the production of Drell-Yan lepton pairs in hadron-hadron collisions with very low transverse momentum which is sensitive to the contribution from the non-perturbative transverse motion of partons inside hadrons as well as to the multiple soft gluon emissions which have to be resumed. To study the two contributions, we use Parton Branching Method which describes the evolution of transverse momentum dependent parton distributions and provides very precise predictions for inclusive observables such as the Drell–Yan cross section as a function of transverse momentum. In this study, we tune a parameter that describes the internal transverse motion of partons within hadron (intrinsic-<span><math><msub><mrow><mi>k</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>) depending on the soft gluon contribution which is varied applying a lower limit to the transverse momentum of the emitted parton in branching up to 2 GeV. It will be shown that the parameter presented by the width of the Gaussian distribution increases with the minimal transverse momentum. This means that by reducing the contribution of soft gluons, more intense internal transverse motion is required (larger intrinsic-<span><math><msub><mrow><mi>k</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span>) to describe experimental data. Moreover, it was observed that the value of the intrinsic-<span><math><msub><mrow><mi>k</mi></mrow><mrow><mi>T</mi></mrow></msub></math></span> increases with the collision energy and such a trend is more pronounced when the minimum transverse momentum of the parton at the branching is higher.</div></div>","PeriodicalId":37968,"journal":{"name":"Nuclear and Particle Physics Proceedings","volume":"347 ","pages":"Pages 12-18"},"PeriodicalIF":0.0,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142357346","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