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Search For New Particles Decaying To Dijets
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Book Synopsis Search for New Particles Decaying to Dijets, B[bar B], and T[bar T] at CDF. by :
Download or read book Search for New Particles Decaying to Dijets, B[bar B], and T[bar T] at CDF. written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Search for New Particles Decaying to Diject in 7 TeV Proton-proton Collisions at CMS. by :
Download or read book Search for New Particles Decaying to Diject in 7 TeV Proton-proton Collisions at CMS. written by and published by . This book was released on 2011 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a measurement of the dijet invariant mass spectrum and search for new particles decaying to dijets at CMS in 7 TeV pp collisions using data corresponding to an integrated luminosity of 2.875 pb−1. The measured dijet mass distribution is compared to QCD prediction from PYTHIA . It is required the pseudorapidity separation of the two jets to satisfy.
Book Synopsis Search for New Particles Decaying to Dijets by :
Download or read book Search for New Particles Decaying to Dijets written by and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for New Particles Decaying to Dijets in Pbar P Collisions at Radicals by :
Download or read book Search for New Particles Decaying to Dijets in Pbar P Collisions at Radicals written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for New Particles Decaying to Dijets, Bbar B, and Tbar T at CDF. by :
Download or read book Search for New Particles Decaying to Dijets, Bbar B, and Tbar T at CDF. written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for New Particles Decaying to Two-jets with the DØ Detector by : Christina Lee Hebert
Download or read book Search for New Particles Decaying to Two-jets with the DØ Detector written by Christina Lee Hebert and published by . This book was released on 2003 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for New Particles Decaying Into Tt̄ Pairs by : Josh A. Cassada
Download or read book A Search for New Particles Decaying Into Tt̄ Pairs written by Josh A. Cassada and published by . This book was released on 1999 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for New Particles Decaying to Dijets in PP̄ Collisions at [square Root Symbol] S by : Chao Wei
Download or read book Search for New Particles Decaying to Dijets in PP̄ Collisions at [square Root Symbol] S written by Chao Wei and published by . This book was released on 1996 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Searches for Dijet Resonances by : Lydia Audrey Beresford
Download or read book Searches for Dijet Resonances written by Lydia Audrey Beresford and published by Springer. This book was released on 2018-09-04 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses one of the most intriguing mysteries of our universe: the nature of dark matter. The results presented here mark a significant and substantial contribution to the search for new physics, in particular for new particles that couple to dark matter. The first analysis presented is a search for heavy new particles that decay into pairs of hadronic jets (dijets). This pioneering analysis explores unprecedented dijet invariant masses, reaching nearly 7 TeV, and sets constraints on several important new physics models. The two subsequent analyses focus on the difficult low dijet mass region, down to 200 GeV, and employ a novel technique to efficiently gather low-mass dijet events. The results of these analyses transcend the long-standing constraints on dark matter mediator particles set by several existing experiments.
Book Synopsis Search for a Neutral Long-lived Particle Decaying to B-jets by : Chad Jeremy Johnson
Download or read book Search for a Neutral Long-lived Particle Decaying to B-jets written by Chad Jeremy Johnson and published by . This book was released on 2009 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Long-lived Particles Decaying to $e ^\pm \mu ^\mp \nu$ by : Roel Aaij
Download or read book Search for Long-lived Particles Decaying to $e ^\pm \mu ^\mp \nu$ written by Roel Aaij and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A SEARCH FOR NEW PARTICLES IN Z DECAY. by : WALTER INNES.
Download or read book A SEARCH FOR NEW PARTICLES IN Z DECAY. written by WALTER INNES. and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at [arrow]" by :
Download or read book Search for Decays of Stopped Long-lived Particles Produced in Proton-proton Collisions at [arrow]" written by and published by . This book was released on 2015 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Decay K_L→π^0\nu\bar{\nu} at the J-PARC KOTO Experiment by : Kota Nakagiri
Download or read book Search for the Decay K_L→π^0\nu\bar{\nu} at the J-PARC KOTO Experiment written by Kota Nakagiri and published by Springer. This book was released on 2020-10-26 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports on a new result from the KL→π0νν search at the J-PARC KOTO experiment, which sets an upper limit of 3×10-9 for the branching fraction of the decay at the 90% confidence level, improving the previous best limit by an order of magnitude. To explain the matter–antimatter asymmetry in the universe, still unknown new physics beyond the standard model (SM) that breaks CP symmetry is necessary. The rare decay of a long-lived neutral K meson, KL→π0νν, is a CP-violating decay. It is an excellent probe to search for new physics because new physics can contribute to the decay and change its branching fraction, while the SM is as small as 3×10-11. However, it is extremely difficult to search for because all of the decay products are neutral and two neutrinos are undetectable. The KL→π0νν signal is identified by measuring two photons from a π0 with a calorimeter and confirming the absence of any other detectable particles with hermetic veto counters. The book contributes to the analysis of neutron-induced backgrounds which were the dominant background sources in the search. For the background caused by two consecutive hadronic showers in the calorimeter due to a neutron, the author evaluated the background yield using a data-driven approach. For another background caused by an η meson production—η decays two photons—by a neutron that hits a veto counter near the calorimeter, the author developed an original analysis technique to reduce it. The book also contributes to the analysis of the normalization modes (KL→3π0, KL→2π0, KL→2γ) to measure KL yield, the estimation of the signal acceptance based on a simulation, and the evaluation of the trigger efficiency. As a result, significant improvements in the measurement were achieved, and this is an important step in the continuing higher sensitivity search, which can reach new physics with the energy scales up to O(100-1000 TeV).
Book Synopsis Search for New High Mass Particles Decaying to Lepton Pairs in P Anti-p Collisions at S**(1/2) by :
Download or read book Search for New High Mass Particles Decaying to Lepton Pairs in P Anti-p Collisions at S**(1/2) written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of General Methods to Search for New Particles by : André Merzky
Download or read book Development of General Methods to Search for New Particles written by André Merzky and published by . This book was released on 1998 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Narrow Resonances Decaying to Dijets in Proton-proton Collisions at {u221A}s by :
Download or read book Search for Narrow Resonances Decaying to Dijets in Proton-proton Collisions at {u221A}s written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, a search for narrow resonances in proton-proton collisions at √s = 13 TeV is presented. The invariant mass distribution of the two leading jets is measured with the CMS detector using a data set corresponding to an integrated luminosity of 2.4 fb–1. The highest observed dijet mass is 6.1 TeV. The distribution is smooth and no evidence for resonant particles is observed. Upper limits at 95% confidence level are set on the production cross section for narrow resonances with masses above 1.5 TeV. When interpreted in the context of specific models, the limits exclude string resonances with masses below 7.0 TeV, scalar diquarks below 6.0 TeV, axigluons and colorons below 5.1 TeV, excited quarks below 5.0 TeV, color-octet scalars below 3.1 TeV, and W' bosons below 2.6 TeV. These results significantly extend previously published limits.
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