Nuclear physics. B, Proceedings, supplements最新文献

{"title":"Interpretation of cosmic ray spectrum above the knee measured by the Tunka-133 array","authors":"Lyubov Sveshnikova ,&nbsp;Leonid Kuzmichev ,&nbsp;Elena Korosteleva ,&nbsp;Vasiliy Prosin ,&nbsp;V.S. Ptuskin","doi":"10.1016/j.nuclphysbps.2014.10.025","DOIUrl":"10.1016/j.nuclphysbps.2014.10.025","url":null,"abstract":"<div><p>A probable interpretation of the fine structure of all particle energy spectrum between the knee and the ankle (the sharp first knee at 3–4 PeV, the spectrum hardening at 20–30 PeV, the second knee at 200–300 PeV) as well as a <span><math><mo>&lt;</mo><mi>ln</mi><mo>⁡</mo><mi>A</mi><mo>&gt;</mo></math></span> (E) dependence measured recently by the Tunka-133 experiment, is presented. We show that these features are compatible with the combined model where cosmic rays around the knee are produced by the group of dedicated sources and the extragalactic light component appears in the energy region of 10¹⁶–<span><math><msup><mrow><mn>10</mn></mrow><mrow><mn>17</mn></mrow></msup><mtext> eV</mtext></math></span> and reaches about 50% of all particles around (2–3)<span><math><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>17</mn></mrow></msup><mtext> eV</mtext></math></span>.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"256 ","pages":"Pages 218-224"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.10.025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"110301512","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":"Fermi bubbles as a source of cosmic rays above 1015 eV","authors":"D.O. Chernyshov ,&nbsp;K.S. Cheng ,&nbsp;V.A. Dogiel ,&nbsp;C.M. Ko","doi":"10.1016/j.nuclphysbps.2014.10.021","DOIUrl":"10.1016/j.nuclphysbps.2014.10.021","url":null,"abstract":"<div><p>Fermi bubbles are giant gamma-ray structures extended north and south of the Galactic center with characteristic sizes of order of 10 kpc recently discovered by Fermi Large Area Telescope. Good correlation between radio and gamma-ray emission in the region covered by Fermi bubbles implies the presence of high-energy electrons in this region. Since it is relatively difficult for relativistic electrons of this energy to travel all the way from the Galactic sources toward Fermi bubbles one can assume that they accelerated in-situ. The corresponding acceleration mechanism should also affect the distribution of the relativistic protons in the Galaxy. Since protons have much larger lifetimes the effect may even be observed near the Earth. In our model we suggest that Fermi bubbles are created by acceleration of electrons on series of shocks born due to periodic star accretions by supermassive black hole Sgr A*. We propose that hadronic CR within the “knee” of the observed CR spectrum are produced by Galactic supernova remnants distributed in the Galactic disk. Reacceleration of these particles in the Fermi Bubble produces CRs beyond the knee. This model provides a natural explanation of the observed CR flux, spectral indexes, and matching of spectra at the knee.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"256 ","pages":"Pages 179-185"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.10.021","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89562022","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":"The JEM-EUSO mission: a space observatory to study the origin of Ultra-High Energy Cosmic Rays","authors":"M. Bertaina ,&nbsp;E. Parizot ,&nbsp;JEM-EUSO Collaboration","doi":"10.1016/j.nuclphysbps.2014.10.033","DOIUrl":"10.1016/j.nuclphysbps.2014.10.033","url":null,"abstract":"<div><p>The Extreme Universe Space Observatory (EUSO) onboard the Japanese Experiment Module (JEM-EUSO) of the International Space Station (ISS) is an innovative space-based mission with the aim of detecting Ultra-High Energy Cosmic Rays (UHECRs) from the ISS, by using the Earth's atmosphere as a calorimeter viewed by a fluorescence telescope. An observatory able to produce an arrival direction map with more than several hundreds events above 5 × 10¹⁹ eV would give important information on the origin of the UHECRs and identify structures in the sky map that contain information about the source density and/or distribution. This is likely to lead to an understanding of the acceleration mechanisms with a high potential for producing discoveries in astrophysics and/or fundamental physics. The scientific motivations of the mission as well as the current development status of the instrument and its performance are reviewed.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"256 ","pages":"Pages 275-286"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.10.033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"105798689","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":"RChL currents in Tauola: implementation and fit parameters","authors":"O. Shekhovtsova ,&nbsp;I.M. Nugent ,&nbsp;T. Przedzinski ,&nbsp;P. Roig ,&nbsp;Z. Was","doi":"10.1016/j.nuclphysbps.2014.09.018","DOIUrl":"10.1016/j.nuclphysbps.2014.09.018","url":null,"abstract":"<div><p>We present the results of a partial upgrade to the Monte Carlo event generator TAUOLA using Resonance Chiral Theory for the two and three meson final states. These modes account for 88% of total hadronic width of the tau meson. The first results of the model parameters have been obtained using Preliminary BaBar data for 3<em>π</em> mode.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 73-76"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74211709","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":"The strong coupling from tau decays without prejudice","authors":"Diogo Boito ,&nbsp;Maarten Golterman ,&nbsp;Matthias Jamin ,&nbsp;Andisheh Mahdavi ,&nbsp;Kim Maltman ,&nbsp;James Osborne ,&nbsp;Santiago Peris","doi":"10.1016/j.nuclphysbps.2014.09.014","DOIUrl":"10.1016/j.nuclphysbps.2014.09.014","url":null,"abstract":"<div><p>We review our recent determination of the strong coupling <span><math><msub><mrow><mi>α</mi></mrow><mrow><mi>s</mi></mrow></msub></math></span> from the OPAL data for non-strange hadronic tau decays. We find that <span><math><msub><mrow><mi>α</mi></mrow><mrow><mi>s</mi></mrow></msub><mo>(</mo><msubsup><mrow><mi>m</mi></mrow><mrow><mi>τ</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>)</mo><mo>=</mo><mn>0.325</mn><mo>±</mo><mn>0.018</mn></math></span> using fixed-order perturbation theory, and <span><math><msub><mrow><mi>α</mi></mrow><mrow><mi>s</mi></mrow></msub><mo>(</mo><msubsup><mrow><mi>m</mi></mrow><mrow><mi>τ</mi></mrow><mrow><mn>2</mn></mrow></msubsup><mo>)</mo><mo>=</mo><mn>0.347</mn><mo>±</mo><mn>0.025</mn></math></span> using contour-improved perturbation theory. At present, these values supersede any earlier determinations of the strong coupling from hadronic tau decays, including those from ALEPH data.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 56-59"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80609061","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":"Searches for charged Higgs bosons, supersymmetry, and exotica with tau leptons with the ATLAS and CMS detectors at the LHC","authors":"Ryan Reece,&nbsp;ATLAS and CMS collaborations","doi":"10.1016/j.nuclphysbps.2014.09.042","DOIUrl":"10.1016/j.nuclphysbps.2014.09.042","url":null,"abstract":"<div><p>Results are presented from the ATLAS and CMS searches for charged Higgs bosons, supersymmetry, and exotica with tau leptons in the final state. The analyses discussed use a dataset corresponding to 5 fb⁻¹ of integrated luminosity from <span><math><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>7</mn><mspace></mspace><mtext>TeV</mtext></math></span> proton–proton collisions at the LHC in 2011.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 171-175"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"94601472","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":"Progress of Belle II – detector and performance","authors":"Kenji Inami","doi":"10.1016/j.nuclphysbps.2014.09.046","DOIUrl":"10.1016/j.nuclphysbps.2014.09.046","url":null,"abstract":"<div><p>The progress on the detector and accelerator in the Belle II experiment is presented. The B factories have successfully accumulated the experimental data at <span><math><mi>ϒ</mi><mo>(</mo><mn>4</mn><mi>S</mi><mo>)</mo></math></span> and achieved the world highest sensitivity on the search for lepton flavor violating tau decays and other new physics searches. The Belle II experiment will obtain 50 times larger data samples compared to the Belle experiment and improve the detector sensitivity. The construction of the detector and accelerator is in progress. The commissioning will start in 2014 and the expected integrated luminosity is 50ab⁻¹ by 2022.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 189-192"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.046","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"96685340","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":"Tau trigger, reconstruction and identification at CMS","authors":"Cesare Calabria ,&nbsp;CMS Collaboration","doi":"10.1016/j.nuclphysbps.2014.09.039","DOIUrl":"10.1016/j.nuclphysbps.2014.09.039","url":null,"abstract":"<div><p>The importance of tau leptons in new physics searches at the LHC led the CMS collaboration to design a specific algorithm, the Hadron Plus Strip (HPS) algorithm, for the reconstruction and identification of taus decaying hadronically (<span><math><msub><mrow><mi>τ</mi></mrow><mrow><mi>had</mi></mrow></msub></math></span>). The HPS algorithm makes use of a particle description of the event to identify hadronic decay modes of <em>τ</em> leptons through the reconstruction of intermediate resonances. It also provides discriminators against potentially large backgrounds from quarks, gluons and light leptons (electrons and muons). Moreover, thanks to the particle event reconstruction avalaible in CMS, a fast online hadronic tau reconstruction can be performed allowing the development of efficient tau trigger selections which allow to perform a broad range of physics analysis. This report describes the <span><math><msub><mrow><mi>τ</mi></mrow><mrow><mi>had</mi></mrow></msub></math></span> reconstruction and identification of the HPS algorithm and its performances, studied in simulated <span><math><mi>Z</mi><mo>→</mo><mi>τ</mi><mi>τ</mi></math></span> events and in samples of proton-proton collision data collected during 2011 and 2012 data-taking at <span><math><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>7</mn><mspace></mspace><mrow><mi>TeV</mi></mrow><mtext> and </mtext><mn>8</mn><mspace></mspace><mrow><mi>TeV</mi></mrow></math></span>, respectively. Finally, the performance of the tau trigger selections is presented.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 159-162"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"96853896","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":"e+e− results from BABAR and implications for the muon g-2","authors":"Michel Davier","doi":"10.1016/j.nuclphysbps.2014.09.030","DOIUrl":"10.1016/j.nuclphysbps.2014.09.030","url":null,"abstract":"<div><p>The <em>BaBar</em> collaboration has nearly completed a program of precise measurements of the cross sections for the dominant channels of <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><mrow><mi>hadrons</mi></mrow></math></span> from threshold to an energy of 3–5 GeV using the initial-state radiation (ISR) method, <em>i.e</em>. the measurement of the cross sections <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><mi>γ</mi><mspace></mspace><mrow><mi>hadrons</mi></mrow></math></span> with the energetic <em>γ</em> detected at large angle to the beams. These data are used as input to vacuum polarization dispersion integrals, in particular the hadronic contribution to the muon <span><math><mi>g</mi><mo>−</mo><mn>2</mn></math></span> anomaly. In addition to the recently measured <span><math><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> cross section, giving the dominant contibution, many multihadronic channels have been investigated, with some recent examples presented here. We give preliminary results for the process <span><math><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>(</mo><mi>γ</mi><mo>)</mo></math></span> using <span><math><mn>232</mn><msup><mrow><mtext>fb</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> of data collected with the <em>BaBar</em> detector at <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> center-of-mass energies near 10.6 GeV. The lowest-order contribution to the hadronic vacuum polarization term in the muon magnetic anomaly is obtained for this channel: <span><math><msubsup><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow><mrow><mi>K</mi><mi>K</mi><mo>,</mo><mi>L</mi><mi>O</mi></mrow></msubsup><mo>=</mo><mo>(</mo><mn>22.95</mn><mo>±</mo><msub><mrow><mn>0.14</mn></mrow><mrow><mtext>(stat)</mtext></mrow></msub><mo>±</mo><msub><mrow><mn>0.22</mn></mrow><mrow><mtext>(syst)</mtext></mrow></msub><mo>)</mo><mo>×</mo><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>10</mn></mrow></msup></math></span>, which is about a factor of three more precise than the previous world average value.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 123-126"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.030","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"105434983","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":"TAU2012. The Twelfth International Workshop on Tau-Lepton Physics","authors":"","doi":"10.1016/S0920-5632(14)00232-1","DOIUrl":"https://doi.org/10.1016/S0920-5632(14)00232-1","url":null,"abstract":"","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Page iii"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0920-5632(14)00232-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138341264","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}