Nuclear physics. B, Proceedings, supplements最新文献

{"title":"Invariant mass spectra of τ−→h−h−h+ντ decays","authors":"I.M. Nugent,&nbsp;BaBar Collaboration","doi":"10.1016/j.nuclphysbps.2014.09.010","DOIUrl":"10.1016/j.nuclphysbps.2014.09.010","url":null,"abstract":"<div><p>Using 342 fb⁻¹ 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></math></span> annihilation data collected with the <em>BaBar</em> detector at the SLAC PEP-II electron-positron asymmetric energy collider operating at a center-of-mass energies near 10.58 GeV, we present the preliminary measurements of the invariant mass distributions of <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>τ</mi></mrow></msub></math></span>, <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>τ</mi></mrow></msub></math></span>, <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>K</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>τ</mi></mrow></msub></math></span> and <span><math><msup><mrow><mi>τ</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><msup><mrow><mi>K</mi></mrow><mrow><mo>+</mo></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>τ</mi></mrow></msub></math></span>, where events with <span><math><msubsup><mrow><mi>K</mi></mrow><mrow><mi>S</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> decays are excluded.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 38-41"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78869829","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":"Development of High Sensitivity Nuclear Emulsion and Fine Grained Emulsion","authors":"H. Kawahara ,&nbsp;T. Asada ,&nbsp;T. Naka ,&nbsp;N. Naganawa ,&nbsp;K. Kuwabara ,&nbsp;M. Nakamura","doi":"10.1016/j.nuclphysbps.2014.09.056","DOIUrl":"10.1016/j.nuclphysbps.2014.09.056","url":null,"abstract":"<div><p>Nuclear emulsion is a particle detector having high spacial resolution and angular resolution. It became useful for large statistics experiment thanks to the development of automatic scanning system. In 2010, a facility for emulsion production was introduced and R&amp;D of nuclear emulsion began at Nagoya university. In this paper, we present results of development of the high sensitivity emulsion and fine grained emulsion for dark matter search experiment. Improvement of sensitivity is achieved by raising density of silver halide crystals and doping well-adjusted amount of chemicals. Production of fine grained emulsion was difficult because of unexpected crystal condensation. By mixing polyvinyl alcohol (PVA) to gelatin as a binder, we succeeded in making a stable fine grained emulsion.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 216-217"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.056","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"108301082","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":"Phenomenology of neutrino oscillation","authors":"Osamu Yasuda","doi":"10.1016/j.nuclphysbps.2014.09.034","DOIUrl":"10.1016/j.nuclphysbps.2014.09.034","url":null,"abstract":"<div><p>Status of neutrino oscillation study is briefly reviewed. Some aspects relevant to tau physics are also described.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 139-142"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113403781","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":"HFAG tau lepton averages","authors":"Alberto Lusiani ,&nbsp;Kiyoshi Hayasaka ,&nbsp;Hisaki Hayashii ,&nbsp;J. Michael Roney ,&nbsp;Boris Shwartz ,&nbsp;Swagato Banerjee","doi":"10.1016/j.nuclphysbps.2014.09.012","DOIUrl":"10.1016/j.nuclphysbps.2014.09.012","url":null,"abstract":"<div><p>The HFAG-Tau group has computed the world averages of the tau lepton properties using the experimental results available in early 2012. The tau lepton branching fractions, mass and lifetime are used to test lepton universality for charged weak currents and to compute <span><math><mo>|</mo><msub><mrow><mi>V</mi></mrow><mrow><mi>u</mi><mi>s</mi></mrow></msub><mo>|</mo></math></span>. For the first time, all <span><math><mo>|</mo><msub><mrow><mi>V</mi></mrow><mrow><mi>u</mi><mi>s</mi></mrow></msub><mo>|</mo></math></span> measurements based primarily on tau data have been combined in a single measurement. Searches for lepton flavor violating decays of the tau lepton are also summarized.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 47-51"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"99710225","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":"Dispersive analysis of τ−→π−π0ντ Belle data","authors":"Daniel Gómez Dumm ,&nbsp;Pablo Roig","doi":"10.1016/j.nuclphysbps.2014.09.017","DOIUrl":"10.1016/j.nuclphysbps.2014.09.017","url":null,"abstract":"<div><p>We analyse Belle data on the decay <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup><msub><mrow><mi>ν</mi></mrow><mrow><mi>τ</mi></mrow></msub></math></span> using a dispersive representation of the vector form factor which is consistent with chiral symmetry and preserves analyticity and unitarity exactly. We fit the unknown theoretical parameters from the data, determining the values of the related low-energy observables <span><math><msubsup><mrow><mo>〈</mo><msup><mrow><mi>r</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>〉</mo></mrow><mrow><mi>V</mi></mrow><mrow><mi>π</mi></mrow></msubsup></math></span> and <span><math><msubsup><mrow><mi>c</mi></mrow><mrow><mi>V</mi></mrow><mrow><mi>π</mi></mrow></msubsup></math></span>. The implementation of isospin breaking effects is also discussed [D. G. Dumm, P. Roig, <span>arXiv:1301.6973</span><svg><path></path></svg>].</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 69-72"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"106895130","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":"Discrimination of models including doubly charged scalar bosons using tau decays","authors":"Koji Tsumura","doi":"10.1016/j.nuclphysbps.2014.09.063","DOIUrl":"10.1016/j.nuclphysbps.2014.09.063","url":null,"abstract":"<div><p>The doubly charged scalar boson (<span><math><msup><mrow><mi>H</mi></mrow><mrow><mo>±</mo><mo>±</mo></mrow></msup></math></span>) is introduced in several models of the new physics beyond the standard model. The <span><math><msup><mrow><mi>H</mi></mrow><mrow><mo>±</mo><mo>±</mo></mrow></msup></math></span> has Yukawa interactions with two left-handed charged leptons or two right-handed charged leptons depending on the models. We study kinematical properties of <span><math><msup><mrow><mi>H</mi></mrow><mrow><mo>±</mo><mo>±</mo></mrow></msup></math></span> decay products through tau leptons in order to discriminate the chiral structures of the new Yukawa interaction. The chirality of tau leptons can be measured by the energy distributions of its decay products, and thus the chiral structure of the new Yukawa interaction can be traced in the invariant-mass distributions of the <span><math><msup><mrow><mi>H</mi></mrow><mrow><mo>±</mo><mo>±</mo></mrow></msup></math></span> decay products.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 230-231"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.063","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"93964515","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":"Precision measurements of the e+e−→π+π−(γ) cross section with the KLOE detector","authors":"G. Mandaglio","doi":"10.1016/j.nuclphysbps.2014.09.028","DOIUrl":"10.1016/j.nuclphysbps.2014.09.028","url":null,"abstract":"<div><p>The muon anomalous magnetic moment is one of the most precisely measured quantities in particle physics and a persistent discrepancy of about 3 <em>σ</em> between standard model (SM) prediction and the experimental measurement has been observed. The leading order contribution <span><math><msubsup><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow><mrow><mi>hlo</mi></mrow></msubsup></math></span> is actually the main source of uncertainty in the theoretical evaluation of the muon anomaly. It is obtained by a dispersion integral using the precision measurement of hadronic cross section. The KLOE experiment at the DAΦNE <em>ϕ</em>−factory in Frascati was the first to exploit Initial State Radiation (ISR) processes to obtain the <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>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>(</mo><mi>γ</mi><mo>)</mo></math></span> cross section below 1 GeV, that accounts for most (70%) of the leading order contribution to the muon anomaly. In year 2005 and 2008 the KLOE-collaboration has published two measurements of the <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 with the photon in the initial state emitted at small angle, and an independent measurement with the photon emitted at large angle was finalized in year 2011. These measurements were normalized using luminosity from Bhabha. In the last years, a new analysis of KLOE data has been performed for obtaining the pion form factor directly from the bin-by-bin <span><math><msup><mrow><mi>π</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mi>γ</mi></math></span> to <span><math><msup><mrow><mi>μ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>μ</mi></mrow><mrow><mo>−</mo></mrow></msup><mi>γ</mi></math></span> ratio. We present the results of this new measurement, showing the comparison with our previous measurements, and its impact on the hadronic contribution to the muon anomaly.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 115-118"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.028","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"95747730","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":"Search for CP Violation in the Decay τ−→π−KS0(≥0π0)ντ at BaBar","authors":"Randall J. Sobie","doi":"10.1016/j.nuclphysbps.2014.09.024","DOIUrl":"10.1016/j.nuclphysbps.2014.09.024","url":null,"abstract":"<div><p>We report a search for <em>CP</em> violation in the decay <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><msubsup><mrow><mi>K</mi></mrow><mrow><mi>S</mi></mrow><mrow><mn>0</mn></mrow></msubsup><mo>(</mo><mo>≥</mo><mn>0</mn><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>)</mo><msub><mrow><mi>ν</mi></mrow><mrow><mi>τ</mi></mrow></msub></math></span> using a dataset of 437 million <em>τ</em> lepton pairs, corresponding to an integrated luminosity of 476 fb⁻¹, collected with the <em>BaBar</em> detector at the PEP-II asymmetric energy <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> storage rings. The <em>CP</em>-violating decay-rate asymmetry is determined to be (−0.36 ± 0.23 ± 0.11)% approximately 2.8 standard deviations from the Standard Model prediction of (0.36 ± 0.01)%.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 99-102"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"109975393","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":"Status of VEPP-2000 and preliminary results","authors":"B.A. Shwartz,&nbsp;CMD-3 and SND collaborations","doi":"10.1016/j.nuclphysbps.2014.09.029","DOIUrl":"10.1016/j.nuclphysbps.2014.09.029","url":null,"abstract":"<div><p>This talk is a review of the status of the new collider, VEPP-2000, that recently started operation at BINP, Novosibirsk. The energy range comprized by this collider is from 0.3 to 2 Gev and the project luminosity up to <span><math><mn>1</mn><mo>⋅</mo><msup><mrow><mn>10</mn></mrow><mrow><mn>32</mn></mrow></msup><mspace></mspace><msup><mrow><mtext>cm</mtext></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup><msup><mrow><mtext>s</mtext></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 119-122"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.029","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"105854069","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":"Measurement of the top-quark pair production cross-section using final states with an electron or a muon and a hadronically decaying τ-lepton","authors":"Yuta Takahashi,&nbsp;ATLAS Collaboration","doi":"10.1016/j.nuclphysbps.2014.09.062","DOIUrl":"10.1016/j.nuclphysbps.2014.09.062","url":null,"abstract":"<div><p>A measurement of the top-quark pair production cross-section is reported using proton-proton collision data at <span><math><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>7</mn><mtext> TeV</mtext></math></span> recorded by ATLAS experiment at the Large Hadron Collider. Events are extracted from 2.05 fb⁻¹ of data by requiring an isolated electron or muon, a large missing transverse momentum, two or more energetic jets and a hadronically decaying <em>τ</em>-lepton. The measured cross-section, <span><math><msub><mrow><mi>σ</mi></mrow><mrow><mi>t</mi><mover><mi>t</mi><mo>¯</mo></mover></mrow></msub><mo>=</mo><mn>186</mn><mo>±</mo><mn>13</mn><mo>(</mo><mtext>stat.</mtext><mo>)</mo><mo>±</mo><mn>20</mn><mo>(</mo><mtext>syst.</mtext><mo>)</mo><mo>±</mo><mn>7</mn><mo>(</mo><mtext>lumi.</mtext><mo>)</mo></math></span> pb, is in good agreement with the Standard Model prediction.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 228-229"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"98656143","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}