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Search For New Physics In Final States With Low Transverse Energy Photon And Missing Transverse Energy In Proton Proton Collisions At Sqrts
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Book Synopsis Search for New Physics in Final States with Low Transverse Energy Photon and Missing Transverse Energy in Proton-proton Collisions at $\sqrt{s} by :
Download or read book Search for New Physics in Final States with Low Transverse Energy Photon and Missing Transverse Energy in Proton-proton Collisions at $\sqrt{s} written by and published by . This book was released on 2015 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for new physics in the [gamma]+ET nal state is performed using pp collision data corresponding to an integrated luminosity of 7.3 fb-1 collected at √s = 8 TeV using low threshold triggers in a phase space region de ned by ET > 45 GeV and ET > 40 GeV.
Book Synopsis A Search for New Physics in Events with Two Photons and Missing Transverse Energy in Proton-proton Collisions at Sqrt(s) by : David Michael Morse
Download or read book A Search for New Physics in Events with Two Photons and Missing Transverse Energy in Proton-proton Collisions at Sqrt(s) written by David Michael Morse and published by . This book was released on 2013 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Physics Beyond the Standard Model in Final States with a Lepton and Missing Transverse Energy in Proton-proton Collisions at $\sqrt{s}$ by :
Download or read book Search for Physics Beyond the Standard Model in Final States with a Lepton and Missing Transverse Energy in Proton-proton Collisions at $\sqrt{s}$ written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for new physics in proton-proton collisions having final states with an electron or muon and missing transverse energy is presented. The analysis uses data collected in 2012 with the CMS detector, at an LHC center-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of 19.7 fb${̂-1}$. No significant deviation of the transverse mass distribution of the charged lepton-neutrino system from the standard model prediction is found. Mass exclusion limits of up to 3.28 TeV at a 95% confidence level for a W${̂\prime}$ boson with the same couplings as that of the standard model W boson are determined. Results are also derived in the framework of split universal extra dimensions, and exclusion limits on Kaluza-Klein W${̂(2)}_{{\rm KK}}$ states are found. The final state with large missing transverse energy also enables a search for dark matter production with a recoiling W boson, with limits set on the mass and the production cross section of potential candidates. Finally, limits are established for a model including interference between a left-handed W${̂\prime}$ boson and the standard model W boson, and for a compositeness model.
Book Synopsis A Search for New Physics in Final States With Two Opposite-SignSame-Flavor Leptons, Jets, and Missing Transverse Energy InProton-Proton Collisions with a Center of Mass Energy of 13 TeV by : Charles Vincent Welke
Download or read book A Search for New Physics in Final States With Two Opposite-SignSame-Flavor Leptons, Jets, and Missing Transverse Energy InProton-Proton Collisions with a Center of Mass Energy of 13 TeV written by Charles Vincent Welke and published by . This book was released on 2016 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is performed in final states with Z$\rightarrow\ell\ell$, jets, and missing transverse momentum using data collected with the CMS detector at the CERN LHC in 2015 corresponding to an integrated luminosity of 2.3~\fbinv of pp collisions at $\sqrt{s}=13$\TeV. Signal regions are defined to maximize sensitivity to new physics including one to search where ATLAS reported a 3.0~$\sigma$ excess at 8~TeV. The observations in all regions are consistent with the predicted standard model backgrounds, and the results are interpreted in the context of simplified models of supersymmetry.
Book Synopsis Search for New Phenomena in Monophoton Final States in Proton-proton Collisions at [mml by :
Download or read book Search for New Phenomena in Monophoton Final States in Proton-proton Collisions at [mml written by and published by . This book was released on 2016 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, results are presented from a search for new physics in final states containing a photon and missing transverse momentum. The data correspond to an integrated luminosity of 19.6 fb-1 collected in proton-proton collisions at √s = 8 TeV with the CMS experiment at the LHC. No deviation from the standard model predictions is observed for these final states. New, improved limits are set on dark matter production and on parameters of models with large extra dimensions. In particular, the first limits from the LHC on branon production are found and significantly extend previous limits from LEP and the Tevatron. Finally, an upper limit of 14.0 fb on the cross section is set at the 95% confidence level for events with a monophoton final state with photon transverse momentum greater than 145 GeV and missing transverse momentum greater than 140 GeV.
Book Synopsis Search for New Physics in Events with High Jet Multiplicity and Low Missing Transverse Momentum in Proton-proton Collisions at $\sqrt{s} by :
Download or read book Search for New Physics in Events with High Jet Multiplicity and Low Missing Transverse Momentum in Proton-proton Collisions at $\sqrt{s} written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A dedicated search is presented for new phenomena in inclusive eight- and ten-jet final states with low missing transverse momentum, with and without identification of jets originating from b quarks. The analysis is based on data from proton-proton collisions corresponding to an integrated luminosity of 19.6 inverse femtobarns collected with the CMS detector at the LHC at sqrt(s) = 8 TeV. The dominant multijet background expectations are obtained from low jet multiplicity control samples. Data agree well with the standard model background predictions, and limits are set in several benchmark models. Colorons (axigluons) with masses between 0.6 and 0.75 (up to 1.15) TeV are excluded at 95% confidence level. Similar exclusion limits for gluinos in R-parity violating supersymmetric scenarios are from 0.6 up to 1.1TeV. These results comprise the first experimental probe of the coloron and axigluon models in multijet final states.
Book Synopsis Search for New Phenomena in Monophoton Final States in Proton{u2013}proton Collisions at by :
Download or read book Search for New Phenomena in Monophoton Final States in Proton{u2013}proton Collisions at written by and published by . This book was released on 2016 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, results are presented from a search for new physics in final states containing a photon and missing transverse momentum. The data correspond to an integrated luminosity of 19.6 fb-1 collected in proton–proton collisions at √s = 8 TeV with the CMS experiment at the LHC. No deviation from the standard model predictions is observed for these final states. New, improved limits are set on dark matter production and on parameters of models with large extra dimensions. In particular, the first limits from the LHC on branon production are found and significantly extend previous limits from LEP and the Tevatron. Finally, an upper limit of 14.0 fb on the cross section is set at the 95% confidence level for events with a monophoton final state with photon transverse momentum greater than 145 GeV and missing transverse momentum greater than 140 GeV.
Book Synopsis Search for New Physics in the Exclusive $\gamma_{Delayed}$ + Missing Transverse Energy Channel in $p\bar{p}$ Collisions at $\sqrt{s}$ by :
Download or read book Search for New Physics in the Exclusive $\gamma_{Delayed}$ + Missing Transverse Energy Channel in $p\bar{p}$ Collisions at $\sqrt{s}$ written by and published by . This book was released on 2012 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the results of a search in the exclusive photon plus missing transverse energy ([gamma] + E T) finnal state in proton antiproton collisions at a center of mass energy of 1.96 TeV using the Collider Detector at Fermilab experiment. The strategy used here is to search for delayed photons coming from gauge mediated supersymmetric events with the exclusive production of X~01 2![gamma]G~. In these models the ~ 01 is the lightest neutralino and has nanosecond lifetime before decaying to a photon ([gamma]) and gravitino (~G) which exits the detector unrecorded. In order to search for this process we select collisions that have a single photon plus missing transverse energy and little other activity in the detector and examine the arrival time of the photon. This arrival time is then compared against expectations from a data driven background of the standard model sources. In the data collected from the Fermilab Tevatron collider from December 2004 to June 2010, representing 6.3 fb-1 of data, we observe 322 events in the photon arrival timing region from 2 nanoseconds to 7 nanoseconds with a data driven background prediction of 257 ± 35. An excess of 65 events is observed, equivalent to a standard deviation (N [sigma]) of 1.65 from the null hypothesis.
Book Synopsis Search for New Physics in Final States with Two Opposite-sign, Same-flavor Leptons, Jets, and Missing Transverse Momentum in Pp Collisions at $\sqrt{s}$ by :
Download or read book Search for New Physics in Final States with Two Opposite-sign, Same-flavor Leptons, Jets, and Missing Transverse Momentum in Pp Collisions at $\sqrt{s}$ written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is presented for physics beyond the standard model in final states with two opposite-sign, same-flavor leptons, jets, and missing transverse momentum. The data sample corresponds to an integrated luminosity of 2.3 inverse femtobarns of proton-proton collisions at sqrt(s)=13 TeV collected with the CMS detector at the LHC in 2015. The analysis uses the invariant mass of the lepton pair, searching for a kinematic edge or a resonant-like excess compatible with the Z boson mass. Both search modes use several event categories in order to increase the sensitivity to new physics. These categories are based on the rapidity of the leptons, the multiplicity of jets and b jets, the scalar sum of jet transverse momenta, and missing transverse momentum. In addition, phase space regions are included for which excesses were reported using the sqrt(s)=8 TeV data. A local significance of 2.6 sigma for a kinematic edge search was observed by the CMS Collaboration, and of 3.0 sigma for events compatible with the Z boson mass by the ATLAS Collaboration. The observations in all signal regions are consistent with the expectations from the standard model, and the results are interpreted in the context of simplified models of supersymmetry.
Book Synopsis Search for New Physics in the Exclusive Delayed ?+E(t) Final State in Pp Collisions at {u221A}(S) by :
Download or read book Search for New Physics in the Exclusive Delayed ?+E(t) Final State in Pp Collisions at {u221A}(S) written by and published by . This book was released on 2012 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a search for heavy, long-lived, neutral particles that decay to photons in proton anti-proton collisions with a center of mass energy of 1.96 TeV at the Collider Detector at Fermilab (CDF) experiment. Such particles are typical of models of Gauge Mediated Supersymmetry Breaking (GMSB). We select events with a single photon, missing transverse energy, and little other activity in the detector. We model the photon arrival time for Standard Model and non-collision sources using a data-driven method and consider photons which have a time of arrival at the detector which is significantly delayed relative to predictions. Using 6.3 fb-1 of data collected from December 2004 to June 2010, we observe 322 events in the signal region compared to a background prediction of 287 ± 24 events. While the data are consistently above predictions, we report a model excess with a significance of 1.2 standard deviations from the null hypothesis.
Book Synopsis Search for New Physics in Pp Collisions at 7 TeV Center-of-mass Energy Using Diphoton Events with Large Missing Transverse Energy in the CMS Experiment at the LHC by : Robert Wayne Stringer
Download or read book Search for New Physics in Pp Collisions at 7 TeV Center-of-mass Energy Using Diphoton Events with Large Missing Transverse Energy in the CMS Experiment at the LHC written by Robert Wayne Stringer and published by . This book was released on 2011 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many theoretical models of physics beyond the Standard Model provide a signature of two photons and large missing transverse energy [Special characters omitted.] in the final state. This search was performed using 36 pb[superscript -1] of proton-proton collision data at [Squared root of s] = 7 TeV. The candidate events are determined by comparing the [Special characters omitted.] distribution for events with two photons and at least one hadronic jet with the [Special characters omitted.] T distribution from QCD and electroweak processes that have no true missing transverse energy. 1.2 ± 0.8 background events were expected, with one event observed. This result was interpreted in two theoretical models beyond the Standard Model. The cross section for General Gauge Mediated Supersymmetry Breaking is given an upper limit between 0.3 pb and 1.1 pb. Universal Extra Dimensions has been excluded for all values of 1/ R
Book Synopsis Signature-based Search for Delayed Photons in Exclusive Photon Plus Missing Transverse Energy Events from Pp[over ̄] Collisions with Sqrt[s] by :
Download or read book Signature-based Search for Delayed Photons in Exclusive Photon Plus Missing Transverse Energy Events from Pp[over ̄] Collisions with Sqrt[s] written by 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 New Physics Using Events with Two Photons and Large Missing Transverse Energy in Pp Collisions at ?s by : Yueh-Feng Liu
Download or read book Search for New Physics Using Events with Two Photons and Large Missing Transverse Energy in Pp Collisions at ?s written by Yueh-Feng Liu and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for New Physics in the Exclusive Gamma+MET Final State in P-pbar Collisions at Sqrt(s) by : Adam Jude Aurisano
Download or read book Search for New Physics in the Exclusive Gamma+MET Final State in P-pbar Collisions at Sqrt(s) written by Adam Jude Aurisano and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a search for heavy, long-lived, neutral particles that decay to photons in proton anti-proton collisions with a center of mass energy of 1.96 TeV at the Collider Detector at Fermilab (CDF) experiment. Such particles are typical of models of Gauge Mediated Supersymmetry Breaking (GMSB). We select events with a single photon, missing transverse energy, and little other activity in the detector. We model the photon arrival time for Standard Model and non-collision sources using a data-driven method and consider photons which have a time of arrival at the detector which is significantly delayed relative to predictions. Using 6.3 fb-1 of data collected from December 2004 to June 2010, we observe 322 events in the signal region compared to a background prediction of 287 ± 24 events. While the data are consistently above predictions, we report a model excess with a significance of 1.2 standard deviations from the null hypothesis. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148427
Book Synopsis Search for New Physics in the Multijet and Missing Transverse Momentum Final State in Proton-proton Collisions at $\sqrt{s}$ by :
Download or read book Search for New Physics in the Multijet and Missing Transverse Momentum Final State in Proton-proton Collisions at $\sqrt{s}$ written by and published by . This book was released on 2014 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for new physics is performed in multijet events with large missing transverse momentum produced in proton-proton collisions at $\sqrt{s}$ = 8 TeV using a data sample corresponding to an integrated luminosity of 19.5 fb−1collected with the CMS detector at the LHC. The data sample is divided into three jet multiplicity categories (3-5, 6-7, and ≥8 jets), and studied further in bins of two variables: the scalar sum of jet transverse momenta and the missing transverse momentum. The observed numbers of events in various categories are consistent with backgrounds expected from standard model processes. Exclusion limits are presented for several simplified supersymmetric models of squark or gluino pair production.
Book Synopsis Search for New Physics in Proton-proton Collision Events with a Lepton and Missing Transverse Energy by : Mark Olschewski
Download or read book Search for New Physics in Proton-proton Collision Events with a Lepton and Missing Transverse Energy written by Mark Olschewski and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for New Phenomena in Ttbar Events with Large Missing Transverse Momentum in Proton-Proton Collisions at Sqrt(s) by :
Download or read book Search for New Phenomena in Ttbar Events with Large Missing Transverse Momentum in Proton-Proton 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:
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