Search For New Color Octet Vector Particle Decaying To Ttbar In Ppbar Collisions At Sqrt S
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Search For New Color Octet Vector Particle Decaying To Ttbar In Ppbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2009
Search For New Color Octet Vector Particle Decaying To Ttbar In Ppbar 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 2009 with categories.
We present the result of a search for a massive color-octet vector particle, (e.g. a massive gluon) decaying to a pair of top quarks in proton-antiproton collisions with a center-of-mass energy of 1.96 TeV. This search is based on 1.9 fb−1 of data collected using the CDF detector during Run II of the Tevatron at Fermilab. We study t{bar t} events in the lepton+jets channel with at least one b-tagged jet. A massive gluon is characterized by its mass, decay width, and the strength of its coupling to quarks. These parameters are determined according to the observed invariant mass distribution of top quark pairs. We set limits on the massive gluon coupling strength for masses between 400 and 800 GeV/c2 and width-to-mass ratios between 0.05 and 0.50. The coupling strength of the hypothetical massive gluon to quarks is consistent with zero within the explored parameter space.
Search For Neutral Color Octet Weak Triplet Scalar Particles In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Neutral Color Octet Weak Triplet Scalar Particles 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 2015 with categories.
A search for pair production of neutral color-octet weak-triplet scalar particles ([Theta]0) is performed in processes where one [Theta]0 decays to a pair of b quark jets and the other to a Z boson plus a jet, with the Z boson decaying to a pair of electrons or muons. The search is performed with data collected by the CMS experiment at the CERN LHC corresponding to an integrated luminosity of 19.7 fb-1 of proton-proton collisions at √s = 8 TeV. The number of observed events is found to be in agreement with the standard model predictions. The 95% confidence level upper limit on the product of the cross section and branching fraction is obtained as a function of the [Theta]0 mass. The 95% confidence level lower bounds on the [Theta]0 mass are found to be 623 and 426 GeV, for two different octo-triplet theoretical scenarios. These are the first direct experimental bounds on particles predicted by the octo-triplet model.
Search For Heavy Long Lived Particles That Decay To Photons In Ppbar Collisions At Sqrt S
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Author : Peter Wagner
language : en
Publisher:
Release Date : 2010
Search For Heavy Long Lived Particles That Decay To Photons In Ppbar Collisions At Sqrt S written by Peter Wagner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
This dissertation presents the results of the first search for heavy, neutral, longlived particles that decay to photons at a hadron collider. We use a sample of +jet+missing transverse energy events in pp̄ collisions at s = 1.96 TEV taken with the Collider Detector at Fermilab. Candidate events are selected based on the arrival time of a high-energy photon at the electromagnetic calorimeter as measured with a timing system that was recently installed. The final result is that we find 2 events, using 570"34 pb−1 of data collected during 2004-2005 at the Fermilab Tevatron, consistent with the background estimate of 1.3"0.7 events.
Search For New Particles Decaying To Dijets In Pbar P Collisions At Radicals
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Author :
language : en
Publisher:
Release Date : 1994
Search For New Particles Decaying To Dijets In Pbar P Collisions At Radicals written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Search For New High Mass Particles Decaying To Lepton Pairs In P Anti P Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2005
Search For New High Mass Particles Decaying To Lepton Pairs In P Anti P Collisions At S 1 2 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Search For New Phenomena In Ttbar Events With Large Missing Transverse Momentum In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Search For New Phenomena In Ttbar Events With Large Missing Transverse Momentum 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 2013 with categories.
Search For W Tbbar In Ppbar Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2008
Search For W Tbbar In Ppbar 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 2008 with categories.
Search For A New Bottomonium State Decaying To Upsilon 1s Pi Pi In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Search For A New Bottomonium State Decaying To Upsilon 1s Pi Pi In Pp 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 2013 with categories.
The results of a search for the bottomonium counterpart, denoted as $X_b$, of the exotic charmonium state X(3872) is presented. The analysis is based on a sample of pp collisions at $\sqrt{s}$ = 8 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 20.7 inverse femtobarns. The search looks for the exclusive decay channel $X_b \to \Upsilon(1S) \pi^+ \pi^-$ followed by $\Upsilon(1S) \to \mu^+ \mu^-$. No evidence for an $X_b$ signal is observed. Upper limits are set at the 95% confidence level on the ratio of the inclusive production cross sections times the branching fractions to $\Upsilon(1S) \pi^+ \pi^-$ of the $X_b$ and the $\Upsilon$(2S). The upper limits on the ratio are in the range 0.9-5.4% for $X_b$ masses between 10 and 11 GeV. These are the first upper limits on the production of a possible $X_b$ at a hadron collider.
Search For New Particles Decaying To Dijets B Bar B And T Bar T At Cdf
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Author :
language : en
Publisher:
Release Date : 2001
Search For New Particles Decaying To Dijets B Bar B And T Bar T At Cdf written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
We present three searches for new particles at CDF. First, using 70 pb[sup[minus]1] of data we search the dijet mass spectrum for resonances. There is an upward fluctuation near 550 GeV/c[sup 2] (2.6[sigma]) with an angular distribution that is adequately described by either QCD alone or QCD plus 5% signal. There is insufficient evidence to claim a signal, but we set the most stringent mass limits on the hadronic decays of axigluons, excited quarks, technirhos, W[prime], Z[prime], and E6 diquarks. Second, using 19 pb[sup[minus]1] of data we search the b-tagged dijet mass spectrum for b[bar b] resonances. Again, an upward fluctuation near 600 GeV/c[sup 2] (2[sigma]) is not significant enough to claim a signal, so we set the first mass limits on topcolor bosons. Finally, using 67 pb[sup[minus]1] of data we search the top quark sample for t[bar t] resonances like a topcolor Z[prime]. Other than an insignificant shoulder of 6 events on a background of 2.4 in the mass region 475--550 GeV/c[sup 2], there is no evidence for new particle production. Mass limits, currently in progress, should be sensitive to a topcolor Z[prime] near 600 GeV/c[sup 2]. In all three searches there is insufficient evidence to claim new particle production, yet there is an exciting possibility that the upward fluctuations are the first signs of new physics beyond the standard model.
Search For A Heavy Neutral Particle Decaying To E Mu E Tau Or Mu Tau In Pp Collisions At Root S
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Author :
language : en
Publisher:
Release Date : 2015
Search For A Heavy Neutral Particle Decaying To E Mu E Tau Or Mu Tau In Pp Collisions At Root 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.