Search For Resonant Production Of High Mass Photon Pairs In Proton Proton Collisions At Sqrt S
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Search For Resonant Production Of High Mass Photon Pairs In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For Resonant Production Of High Mass Photon Pairs In Proton Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
A search for the resonant production of high-mass photon pairs is presented. The analysis is based on samples of proton-proton collision data collected by the CMS experiment at center-of-mass energies of 8 and 13 TeV, corresponding to integrated luminosities of 19.7 and 3.3 inverse femtobarns, respectively. The search focuses on spin-0 and spin-2 resonances with masses between 0.5 and 4 TeV and with widths, relative to the mass, between 1.4E-4 and 5.6E-2. Limits are set on scalar resonances produced through gluon-gluon fusion, and on Randall--Sundrum gravitons. A modest excess of events compatible with a narrow resonance with a mass of about 750 GeV is observed. The local significance of the excess is approximately 3.4 standard deviations. The significance is reduced to 1.6 standard deviations once the effect of searching under multiple signal hypotheses is considered. More data are required to determine the origin of this excess.
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Author : 이종필
language : ko
Publisher: 글항아리
Release Date : 2017-05-08
written by 이종필 and has been published by 글항아리 this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-05-08 with Computers categories.
브런치를 먹으며 이해하는 일상 속 물리학 이야기. <대통령을 위한 과학 에세이> <상대성 이론> <물리학 클래식> 등의 저서를 통해 어렵다고만 생각된 과학을 쉽게 설명해온 저자는 이 책에서도 생활 속 에피소드를 통해 어려운 물리학적 지식에 좀더 쉽게 접근할 수 있도록 풀어나간다. 저자는 "생존에 유리한 (그래서 익숙한) 사고방식이 자연의 근본 질서와는 다르다는 사실을 처음 알게 된 것이 겨우 100여 년 전"이라면서 그래서 현대 물리학은 어렵게 느껴질 수밖에 없다고 말한다. 다른 한편 일상과 뗄 수 없는 관계가 또 물리학이므로 그것이 진정으로 자연이 작동하는 방식이라면, 엄청난 지적 고통이 따르더라도 한번쯤은 알아볼 만한 가치가 있지 않겠느냐고 반문한다. 이 책은 저자가 라디오 프로그램의 과학 코너를 통해 다루었던, 일상에서 쉽게 접할 수 있는 물리학에 관해 대담으로 엮은 것이다. 대통령 선거 결과를 과학적으로 예측하는 방법, 북한의 핵 위협에 대한 과학적 진실, 4대강 사업에 대한 위험성과 같은 정치적 이슈부터 타임슬립 드라마가 가능할 것인지에 대한 접근과 같은 흥미로운 이야기까지 연령과 성별을 불문하고 누구나 쉽게 읽을 수 있는, 말 그대로 브런치를 먹으며 물리학에 대해 논의할 수 있는 책이다.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Comprehensive Dissertation Index
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Author :
language : en
Publisher:
Release Date : 1989
Comprehensive Dissertation Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Dissertations, Academic categories.
Search For High Mass Diphoton Resonances In Proton Proton Collisions At 13 Tev And Combination With 8 Tev Search
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Author :
language : en
Publisher:
Release Date : 2016
Search For High Mass Diphoton Resonances In Proton Proton Collisions At 13 Tev And Combination With 8 Tev Search written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The results of a search are presented for the resonant production of high-mass photon pairs, specifically spin-0 and spin-2 resonances with an invariant mass between 0.5 and 4.5 TeV, and with a width, relative to the mass, between 1.4E-4 and 5.6E-2. The data sample corresponds to an integrated luminosity of 12.9 inverse femtobarns of proton-proton collisions collected with the CMS detector in 2016 at a center-of-mass energy of 13 TeV. No significant excess is observed relative to the standard model expectation. The results of the search are combined statistically with those previously obtained in 2012 and 2015 at sqrt(s)=8 and 13TeV, respectively, corresponding to integrated luminosities of 19.7 and 3.3 inverse femtobarns, to derive exclusion limits on scalar resonances produced through gluon-gluon fusion, and on Randall-Sundrum gravitons. The lower mass limits for Randall-Sundrum gravitons range from 1.95 to 4.45 TeV for coupling parameters between 0.01 and 0.2. These are the most stringent limits on Randall-Sundrum graviton production to date.
Government Reports Annual Index
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Author :
language : en
Publisher:
Release Date : 1989
Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with Government reports announcements & index categories.
Interference Problems On Wing Fuselage Combinations In Inviscid Incompressible Flow
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Author : Aeronautical Research Council (Great Britain)
language : en
Publisher:
Release Date : 1974
Interference Problems On Wing Fuselage Combinations In Inviscid Incompressible Flow written by Aeronautical Research Council (Great Britain) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Airplanes categories.
Government Reports Annual Index Keyword A L
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Author :
language : en
Publisher:
Release Date : 1983
Government Reports Annual Index Keyword A L written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Government reports announcements & index categories.
Search For Narrow High Mass Resonances In Proton U2013 Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Narrow High Mass Resonances In Proton U2013 Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A search for a narrow, high-mass resonance decaying into Z and Higgs (H) bosons is presented. The final state studied consists of a merged jet pair and a ? pair resulting from the decays of Z and H bosons, respectively. This analysis is based on a data sample of proton–proton collisions at a center-ofmass energy of 8 TeV, collected with the CMS experiment in 2012, and corresponding to an integrated luminosity of 19.7 fb-1. In the resonance mass range of interest, which extends from 0.8 to 2.5 TeV, the Z and H bosons are produced with large momenta, which implies that the final products of the two quarks or the two ? leptons must be detected within a small angular interval. A combination of all possible decay modes of the ? leptons, production cross sections in a range between 0.9 and 27.8 fb are excluded at 95% confidence level, depending on the resonance mass.
Search For Heavy Resonances Decaying To Tau Lepton Pairs In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For Heavy Resonances Decaying To Tau Lepton Pairs In Proton Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
A search for heavy resonances that decay to tau lepton pairs is performed using proton-proton collisions at \sqrt{s}$ = 13 TeV. The data were collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 2.2 inverse femtobarns. The observations are in agreement with standard model predictions. An upper limit at 95% confidence level on the product of the production cross section and branching fraction into tau lepton pairs is calculated as a function of the resonance mass. For the sequential standard model, the presence of Z' bosons decaying into tau lepton pairs is excluded for Z' masses below 2.1 TeV, extending previous limits for this final state. For the topcolor-assisted technicolor model, which predicts Z' bosons that preferentially couple to third-generation fermions, Z' masses below 1.7 TeV are excluded, representing the most stringent limit to date.