{"title":"CP Violation in τ Decays at SuperB & Belle II Experiments – like Finding Signs of Dark Matter","authors":"I.I. Bigi","doi":"10.1016/j.nuclphysbps.2014.09.022","DOIUrl":"10.1016/j.nuclphysbps.2014.09.022","url":null,"abstract":"<div><p>BaBar has found <span><math><msub><mrow><mi>A</mi></mrow><mrow><mi>CP</mi></mrow></msub><mo>(</mo><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><mi>ν</mi><msub><mrow><mi>K</mi></mrow><mrow><mi>S</mi></mrow></msub><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>[</mo><mo>≥</mo><msup><mrow><mi>π</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>]</mo><mo>)</mo><mo>=</mo><mo>(</mo><mo>−</mo><mn>0.36</mn><mo>±</mo><mn>0.23</mn><mo>±</mo><mn>0.11</mn><mo>)</mo><mtext>%</mtext></math></span> with 2.8 <em>σ</em> difference with SM prediction <span><math><msub><mrow><mi>A</mi></mrow><mrow><mi>CP</mi></mrow></msub><mo>(</mo><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>→</mo><mi>ν</mi><msub><mrow><mi>K</mi></mrow><mrow><mi>S</mi></mrow></msub><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup><mo>)</mo><mo>=</mo><mo>(</mo><mn>0.36</mn><mo>±</mo><mn>0.01</mn><mo>)</mo><mtext>%</mtext></math></span> based on <span><math><msup><mrow><mi>K</mi></mrow><mrow><mn>0</mn></mrow></msup><mo>−</mo><msup><mrow><mover><mi>K</mi><mo>¯</mo></mover></mrow><mrow><mn>0</mn></mrow></msup></math></span> oscillation. Four central points: (i) to establish both the ‘existence’ of New Dynamics (ND) and its ‘features’ in local CP asymmetries; (ii) to increase the number of final states to be probed; (iii) to emphasize correlations of CP violations between different final states; (iv) likewise for the correlations with <span><math><msup><mrow><mi>D</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span> final states. These measurements should be possible at SuperB & Belle II experiments.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 91-94"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"112086170","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":"Probing new physics with τ-leptons at the LHC","authors":"German Valencia","doi":"10.1016/j.nuclphysbps.2014.09.043","DOIUrl":"10.1016/j.nuclphysbps.2014.09.043","url":null,"abstract":"<div><p>We discuss new physics that can show up in the <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> production process at the LHC but not in the dimuon or the dielectric channels. We consider three different generic possibilities: a new resonance in the Drell-Yan process in the form of a non-universal <span><math><msup><mrow><mi>Z</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span>; a new non-resonant contribution to <span><math><mi>q</mi><mover><mi>q</mi><mo>¯</mo></mover><mo>→</mo><msup><mrow><mi>τ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> in the form of leptoquarks; and contributions from gluon fusion due to effective lepton gluonic couplings. We emphasize the use of the charge asymmetry both to discover new physics and to distinguish between different possibilities</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 176-179"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86039799","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 Leading-Order Hadronic Vacuum Polarization Dispersion Calculation","authors":"Zhiqing Zhang","doi":"10.1016/j.nuclphysbps.2014.09.032","DOIUrl":"10.1016/j.nuclphysbps.2014.09.032","url":null,"abstract":"<div><p>The leading-order hadronic contribution to the muon magnetic anomaly <span><math><msub><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow></msub><mo>≡</mo><mo>(</mo><msub><mrow><mi>g</mi></mrow><mrow><mi>μ</mi></mrow></msub><mo>−</mo><mn>2</mn><mo>)</mo><mo>/</mo><mn>2</mn></math></span>, calculated using a dispersion integral 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 and <em>τ</em> decay data, is briefly reviewed. This contribution has the largest uncertainty to the predicted value of <span><math><msub><mrow><mi>a</mi></mrow><mrow><mi>μ</mi></mrow></msub></math></span>, which differs from the experimental value by ∼ 3.6 (2.4) standard deviations for 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></math></span> (<em>τ</em>) based analysis. New results since the last workshop and main open issues on the subject are discussed.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 131-134"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90542803","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 the Standard Model Higgs Boson in the H to τ+τ− to lepton-hadron and hadron-hadron Decay Modes with the ATLAS Detector","authors":"Yuki Sakurai, ATLAS Collaboration","doi":"10.1016/j.nuclphysbps.2014.09.061","DOIUrl":"10.1016/j.nuclphysbps.2014.09.061","url":null,"abstract":"<div><p>In this proceeding, a search for a Higgs boson in the H to <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> decay mode, where both taus decay hadronically or one decay hadronically and one leptonically. The analysis is based on a data sample of proton-proton collision collected by the ATLAS detector at the Large Hadron Collider (LHC) at centre-of-mass energies of 7 TeV during 2011, corresponding to an integrated luminosity of <span><math><mn>4.7</mn><mi>f</mi><msup><mrow><mi>b</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>. No significant excess is observed in the Higgs boson mass range of 100–150 GeV. The observed (expected) limits on the cross-section times branching ratio for H to <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> at <span><math><msub><mrow><mi>m</mi></mrow><mrow><mi>H</mi></mrow></msub><mo>=</mo><mn>125</mn><mtext> GeV</mtext></math></span> are 6.2(5.9) and 6.3(6.5) for lepton-hadron and hadron-hadron decay modes, respectively.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 226-227"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.061","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"108451816","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 Light and Dark Higgs at BaBar","authors":"Swagato Banerjee, BaBar Collaboration","doi":"10.1016/j.nuclphysbps.2014.09.005","DOIUrl":"10.1016/j.nuclphysbps.2014.09.005","url":null,"abstract":"<div><p>In many new physics extensions of the Standard Model, light pseudoscalar Higgs or dark matter candidates naturally appear. Searches for light and dark Higgs bosons performed with the large <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> datasets collected by the <em>BaBar</em> experiment at center-of-mass energies around the ϒ resonances are presented.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 16-19"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"109428082","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 Summary","authors":"Antonio Pich","doi":"10.1016/j.nuclphysbps.2014.09.047","DOIUrl":"10.1016/j.nuclphysbps.2014.09.047","url":null,"abstract":"<div><p>The main highlights discussed at TAU2012 are briefly summarized. Besides the standard topics on lepton physics covered also at previous conferences (universality, QCD tests, <span><math><msub><mrow><mi>V</mi></mrow><mrow><mi>u</mi><mi>s</mi></mrow></msub></math></span> determination from <em>τ</em> decay, <span><math><mi>g</mi><mo>−</mo><mn>2</mn></math></span>, <em>ν</em> oscillations, lepton-flavour violation), the <em>τ</em> lepton is playing now a very important role in searches for new physics phenomena.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 193-197"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.047","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"104481972","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 τ Polarization in W→τν Decays with the ATLAS Detector in pp Collisions at s=7TeV","authors":"Zofia Czyczula, ATLAS collaboration","doi":"10.1016/j.nuclphysbps.2014.09.044","DOIUrl":"10.1016/j.nuclphysbps.2014.09.044","url":null,"abstract":"<div><p>In this proceedings, the first measurement of <em>τ</em> polarization at a hadron collider is presented. The method for extracting the <em>τ</em> polarization is independent of the mode of <em>τ</em> production and can be applied to the characterization of new phenomena at the Large Hadron Collider. The method has been applied to <span><math><mi>W</mi><mo>→</mo><mi>τ</mi><mi>ν</mi></math></span> decays and the measured value of <span><math><msub><mrow><mi>P</mi></mrow><mrow><mi>τ</mi></mrow></msub><mo>=</mo><mo>−</mo><mn>1.06</mn><mo>±</mo><mn>0.04</mn><mspace></mspace><msubsup><mrow><mtext><mtext>(</mtext><mi>stat</mi><mtext>)</mtext></mtext></mrow><mrow><mo>−</mo><mn>0.07</mn></mrow><mrow><mo>+</mo><mn>0.05</mn></mrow></msubsup><mspace></mspace><mtext><mtext>(</mtext><mi>syst</mi><mtext>)</mtext></mtext></math></span> is in agreement with the Standard Model prediction.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 180-183"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.044","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113596700","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 mu LFV from MEG","authors":"H. Natori, MEG collaboration","doi":"10.1016/j.nuclphysbps.2014.09.007","DOIUrl":"10.1016/j.nuclphysbps.2014.09.007","url":null,"abstract":"<div><p>The MEG experiment searches for a lepton flavor violating muon decay, <span><math><mi>μ</mi><mo>→</mo><mi>e</mi><mi>γ</mi></math></span>, discovery of which gives a clear evidence of the new physics beyond the Standard Model of the elementary particle physics. By analyzing the data taken in 2009 and 2010, which corresponds to 1.8 × 10<sup>14</sup> muon decays in the stopping target, the result was consistent with null signal. The most stringent upper limit on the branching ratio of 2.4 × 10<sup>−12</sup> is set.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 25-28"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"108451736","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 Decays in Pythia 8","authors":"Philip Ilten","doi":"10.1016/j.nuclphysbps.2014.09.019","DOIUrl":"10.1016/j.nuclphysbps.2014.09.019","url":null,"abstract":"<div><p>As of version 8.150 of <span>Pythia</span>, the isotropic decay model of <em>τ</em>-leptons has been replaced with sophisticated <em>τ</em>-lepton decay machinery. The decays and spin correlations for <em>τ</em>-leptons in <span>Pythia</span> 8 are described, including the spin correlation algorithm, the available <em>τ</em>-lepton production processes, the <em>τ</em>-lepton decay models, the user interface, and the implementation.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 77-80"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"111867281","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 neutral MSSM Higgs Bosons in the h/A/H to τ+τ− Decay Mode with the ATLAS Detector","authors":"Takashi Mitani, ATLAS Collaboration","doi":"10.1016/j.nuclphysbps.2014.09.058","DOIUrl":"10.1016/j.nuclphysbps.2014.09.058","url":null,"abstract":"<div><p>In these proceedings a search for neutral Higgs bosons in the Minimal Supersymmetric Standard Model in the decay modes h/A/H to <span><math><msup><mrow><mi>τ</mi></mrow><mrow><mo>+</mo></mrow></msup><msup><mrow><mi>τ</mi></mrow><mrow><mo>−</mo></mrow></msup></math></span> is reported. This search is performed using 4.7 fb<sup>−1</sup> of integrated luminosity of <em>pp</em> collision data collected at the Large Hadron Collider at <span><math><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>7</mn><mtext> TeV</mtext></math></span> during 2011. Upper limits on the cross-section times branching ratio, for both <em>b</em>-associated and gluon-fusion production modes, are derived for the Higgs mass range of 90–500 GeV. Exclusion limits are also shown in the <span><math><msub><mrow><mi>m</mi></mrow><mrow><mi>A</mi></mrow></msub><mo>−</mo><mi>tan</mi><mo></mo><mi>β</mi></math></span> plane for the <span><math><msubsup><mrow><mi>m</mi></mrow><mrow><mi>h</mi></mrow><mrow><mi>max</mi></mrow></msubsup></math></span> scenario with <span><math><mi>μ</mi><mo>></mo><mn>0</mn></math></span>.</p></div>","PeriodicalId":93343,"journal":{"name":"Nuclear physics. B, Proceedings, supplements","volume":"253 ","pages":"Pages 220-221"},"PeriodicalIF":0.0,"publicationDate":"2014-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.nuclphysbps.2014.09.058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"112897562","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}