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Search For Quark Contact Interactions And Extra Spatial Dimensions Using Dijet Angular Distributions In Proton Proton Collisions At Sqrt S
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Book Synopsis Search for Quark Contact Interactions and Extra Spatial Dimensions Using Dijet Angular Distributions in Proton-proton Collisions at $\sqrt S by :
Download or read book Search for Quark Contact Interactions and Extra Spatial Dimensions Using Dijet Angular Distributions in Proton-proton Collisions at $\sqrt S written by and published by . This book was released on 2015 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our search is presented for quark contact interactions and extra spatial dimensions in proton-proton collisions at √s=8TeVusing dijet angular distributions. The search is based on a data set corresponding to an integrated luminosity of 19.7fb-1collected by the CMS detector at the CERN LHC. Dijet angular distributions are found to be in agreement with the perturbative QCD predictions that include electroweak corrections. Limits on the contact interaction scale from a variety of models at next-to-leading order in QCD corrections are obtained. A benchmark model in which only left-handed quarks participate is excluded up to a scale of 9.0 (11.7)TeV for destructive (constructive) interference at 95% confidence level. Finally, lower limits between 5.9 and 8.4TeV on the scale of virtual graviton exchange are extracted for the Arkani-Hamed-Dimopoulos-Dvali model of extra spatial dimensions.
Book Synopsis Search for New Physics with Dijet Angular Distributions in Proton-proton Collisions at $\sqrt{s}$ by :
Download or read book Search for New Physics with Dijet Angular Distributions in Proton-proton Collisions at $\sqrt{s}$ written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is presented for extra spatial dimensions, quantum black holes, and quark contact interactions in measurements of dijet angular distributions in proton-proton collisions at sqrt(s) = 13 TeV. The data were collected with the CMS detector at the LHC and correspond to an integrated luminosity of 2.6 inverse femtobarns. The distributions are found to be in agreement with predictions from perturbative quantum chromodynamics that include electroweak corrections. Limits for different contact interaction models are obtained in a benchmark model, valid to next-to-leading order in QCD, in which only left-handed quarks participate, with quark contact interactions excluded up to a scale of 11.5 or 14.7 TeV for destructive or constructive interference, respectively. The production of quantum black holes is excluded for masses below 7.8 or 5.3 TeV, depending on the model. The lower limits for the scales of virtual graviton exchange in the Arkani-Hamed--Dimopoulos--Dvali model of extra spatial dimensions are in the range 7.9-11.2 TeV, and are the most stringent set of limits available.
Book Synopsis Search for New Phenomena in Dijet Angular Distributions in Proton-proton Collisions at [math Display by :
Download or read book Search for New Phenomena in Dijet Angular Distributions in Proton-proton Collisions at [math Display written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, a search for new phenomena in LHC proton-proton collisions at a center-of-mass energy of √s=8 TeV was performed with the ATLAS detector using an integrated luminosity of 17.3 fb-1. The angular distributions are studied in events with at least two jets; the highest dijet mass observed is 5.5 TeV. All angular distributions are consistent with the predictions of the standard model. In a benchmark model of quark contact interactions, a compositeness scale below 8.1 TeV in a destructive interference scenario and 12.0 TeV in a constructive interference scenario is excluded at 95% C.L.; median expected limits are 8.9 TeV for the destructive interference scenario and 14.1 TeV for the constructive interference scenario.
Book Synopsis Search for Quark Compositeness in Dijet Angular Distributions from Pp Collisions at Sqrt(s) by :
Download or read book Search for Quark Compositeness in Dijet Angular Distributions from Pp Collisions at Sqrt(s) written by and published by . This book was released on 2012 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for quark compositeness using dijet angular distributions from pp collisions at sqrt(s) = 7 TeV is presented. The search has been carried out using a data sample corresponding to an integrated luminosity of 2.2 inverse femtobarns, recorded by the CMS experiment at the LHC. Normalized dijet angular distributions have been measured for dijet invariant masses from 0.4 TeV to above 3 TeV and compared with a variety of contact interaction models, including those which take into account the effects of next-to-leading-order QCD corrections. The data are found to be in agreement with the predictions of perturbative QCD, and lower limits are obtained on the contact interaction scale, ranging from 7.5 up to 14.5 TeV at 95% confidence level.
Book Synopsis Measurement of Dijet Angular Distributions and Search for Quark Compositeness in Pp Collisions at $sqrt{s} by :
Download or read book Measurement of Dijet Angular Distributions and Search for Quark Compositeness in Pp Collisions at $sqrt{s} written by and published by . This book was released on 2011 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dijet angular distributions are measured over a wide range of dijet invariant masses in pp collisions at s√ = 7 TeV, at the CERN LHC. The event sample, recorded with the CMS detector, corresponds to an integrated luminosity of 36 inverse picobarns. The data are found to be in good agreement with the predictions of perturbative QCD, and yield no evidence of quark compositeness. With a modified frequentist approach, a lower limit on the contact interaction scale for left-handed quarks of Lambda = 5.6 TeV is obtained at the 95% confidence level.
Book Synopsis Search for Contact Interactions in Dimuon Events From $Pp$ Collisions at $\sqrt{s} by :
Download or read book Search for Contact Interactions in Dimuon Events From $Pp$ Collisions at $\sqrt{s} written by and published by . This book was released on 2013 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Study of Quark Substructure Using Proton-proton Collisions by : Daniel Miner
Download or read book Study of Quark Substructure Using Proton-proton Collisions written by Daniel Miner and published by . This book was released on 2011 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Two or more jets are frequently produced as a result of proton-proton collisions. The angular distribution of these jets can provide a wealth of information about the underlying interactions taking place as the protons collide. In this study, we use a simple observable called the dijet centrality ratio to examine this angular distribution, and search a 35.7 pb1 sample of data at [square root]s = 7 TeV from CERN's Large Hadron Collider for evidence of quark substructure. We expect to set a 95% confidence limit on the energy scale of such interactions of [lambda]
Book Synopsis Search for Quark Compositeness with the Dijet Centrality Ratio in $pp$ Collisions at $\sqrt{s} by :
Download or read book Search for Quark Compositeness with the Dijet Centrality Ratio in $pp$ Collisions at $\sqrt{s} written by and published by . This book was released on 2010 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for quark compositeness in the form of quark contact interactions, based on hadronic jet pairs (dijets) produced in proton-proton collisions at sqrt(s)=7 TeV, is described. The data sample of the study corresponds to an integrated luminosity of 2.9 inverse picobarns collected with the CMS detector at the LHC. The dijet centrality ratio, which quantifies the angular distribution of the dijets, is measured as a function of the invariant mass of the dijet system and is found to agree with the predictions of the Standard Model. A statistical analysis of the data provides a lower limit on the energy scale of quark contact interactions. The sensitivity of the analysis is such that the expected limit is 2.9 TeV; because the observed value of the centrality ratio at high invariant mass is below the expectation, the observed limit is 4.0 TeV at the 95% confidence level.
Book Synopsis Dijet Angular Distributions in Proton-proton Collisions at √s by : Nele Boelaert
Download or read book Dijet Angular Distributions in Proton-proton Collisions at √s written by Nele Boelaert and published by . This book was released on 2010 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Searches for New Physics Using Dijet Angular Distributions in Proton-proton Collisions at √s by : Ryan Mark Buckingham
Download or read book Searches for New Physics Using Dijet Angular Distributions in Proton-proton Collisions at √s written by Ryan Mark Buckingham and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Contact Interactions Using Dijet Angular Distributions with the ATLAS Detector at the CERN Large Hadron Collider by : Pier-Olivier DeViveiros
Download or read book Search for Contact Interactions Using Dijet Angular Distributions with the ATLAS Detector at the CERN Large Hadron Collider written by Pier-Olivier DeViveiros and published by . This book was released on 2011 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: The LHC, with its center-of-mass energy of 7 TeV, offers the chance to investigate the fundamental constituents of matter at a higher energy scale than ever before. Using the data acquired by the ATLAS detector in the summer of 2010, two different measures of the angular distributions of dijet final states are studied and compared to Standard Model QCD expectations. Such a comparison is used to set new stringent limits on the existence of quark substructure.
Book Synopsis Search for Large Extra Dimensions in the Diphoton Final State at the Large Hadron Collider by :
Download or read book Search for Large Extra Dimensions in the Diphoton Final State at the Large Hadron Collider written by and published by . This book was released on 2011 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for large extra spatial dimensions via virtual-graviton exchange in the diphoton channel has been carried out with the CMS detector at the LHC. No excess of events above the standard model expectations is found using a data sample collected in proton-proton collisions at sqrt(s) = 7 TeV and corresponding to an integrated luminosity of 36 inverse picobarns. New lower limits on the effective Planck scale in the range of 1.6-2.3 TeV at the 95% confidence level are set, providing the most restrictive bounds to date on models with more than two large extra dimensions.
Book Synopsis Search for New Phenomena in Dijet Angular Distributions Measured with the ATLAS Detector in Proton-proton Collisions at √s _327 7 TeV by : Thorsten A. Dietzsch
Download or read book Search for New Phenomena in Dijet Angular Distributions Measured with the ATLAS Detector in Proton-proton Collisions at √s _327 7 TeV written by Thorsten A. Dietzsch and published by . This book was released on 2013 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Contact Interactions and Large Extra Dimensions in Dimuon Events from Pp Collisions at √s by : Tüli̇n Varol
Download or read book Search for Contact Interactions and Large Extra Dimensions in Dimuon Events from Pp Collisions at √s written by Tüli̇n Varol and published by . This book was released on 2015 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Contact Interactions in the Dimuon Channel in $pp$ Collisions at $\sqrt{s} by :
Download or read book Search for Contact Interactions in the Dimuon Channel in $pp$ Collisions at $\sqrt{s} written by and published by . This book was released on 2012 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: The standard model fails to explain the variety of observed quark and lepton avors and their masses suggesting that there might exist a more fundamental basis. If quarks and leptons are composite particles made up of more basic constituents, a new physics interaction in the form of a four-fermion contact interaction arises between them. Experimentally the signal is manifest as a deviation from the standard model prediction in the high-mass tail for the invariant mass distribution of the opposite-sign dimuon pairs. The Large Hadron Collider accelerator at the Center for European Nuclear Research is built to explore new physics possibilities from proton-proton collisions occurring at the world's highest center-of-mass energy. This thesis discusses in detail a search strategy for a new physics possibility based on a left-handed current model of contact interactions. Based on 5.3 fb-1 of 2011 data as collected by the Compact Muon Solenoid detector, exclusion lower limits at 95% con dence level are set on the compositeness energy scale, for both destructive and constructive interferences of the new physics with the standard model Drell-Yan process. These limits form the most stringent limits to date and exceed the current published limits signi cantly.
Book Synopsis Search for Contact Interactions, Large Extra Dimensions and Finite Quark Radius in Ep Collisions at HERA by :
Download or read book Search for Contact Interactions, Large Extra Dimensions and Finite Quark Radius in Ep Collisions at HERA written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Quark Compositeness in 7 TeV Proton-proton Collisions with the ATLAS Detector at the Large Hadron Collider by : Frank Berghaus
Download or read book Search for Quark Compositeness in 7 TeV Proton-proton Collisions with the ATLAS Detector at the Large Hadron Collider written by Frank Berghaus and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Quarks and leptons are assumed to be fundamental particles in the Standard Model of particle physics. The Large Hadron Collider provided 7 TeV proton-proton collisions in 2010. These collisions permit the search for quark substructure at a smaller length scale than was previously possible. This thesis is an investigation of the angular distribution of high dijet mass events in 36 pb^{-1} of data recorded by the ATLAS detector. Further contributions to technical aspects of the analysis are described in the appendices. This analysis excludes quark substructure at?
