Observation Of Upsilon Mathrm 1s Pair Production In Proton Proton Collisions At Sqrt S
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Observation Of Upsilon Mathrm 1s Pair Production In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Observation Of Upsilon Mathrm 1s Pair Production 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.
Pair production of $\Upsilon(\mathrm{1S})$ mesons is observed at the LHC in proton-proton collisions at $ \sqrt{s} = $ 8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb$^{-1}$. Both $\Upsilon(\mathrm{1S})$ candidates are fully reconstructed via their decays to $\mu^{+}\mu^{- } $. The fiducial acceptance region is defined by an absolute $\Upsilon(\mathrm{1S})$ rapidity smaller than 2.0. The fiducial cross section for the production of $\Upsilon(\mathrm{1S})$ pairs, assuming that both mesons decay isotropically, is measured to be 68.8 $\pm$ 12.7 (stat) $\pm$ 7.4 (syst) $\pm$ 2.8 ($\mathcal{B}$) pb, where the third uncertainty comes from the uncertainty in the branching fraction of $\Upsilon(\mathrm{1S})$ decays to $\mu^{+}\mu^{-}$. Assuming instead that the $\Upsilon(\mathrm{1S})$ mesons are produced with different polarizations leads to variations in the measured cross section in the range from $-38\%$ to $+36\%$.
Measurement Of Prompt J Psi Pair Production In Pp Collisions At Sqrt S
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Author :
language : en
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Release Date : 2014
Measurement Of Prompt J Psi Pair Production 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 2014 with categories.
Production of prompt J/[psi] meson pairs in proton-proton collisions at √s = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb-1. The two J/[psi] mesons are fully reconstructed via their decays into [mu] + [mu] - pairs. This observation provides for the first time access to the high-transverse-momentum region of J/[psi] pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/[psi] transverse momentum (p T J/[psi] ) and rapidity (
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.
Measurement Of Upsilon 1s 2s 3s Production In P P And Au Au Collisions At Sqrt S Mathrm Nn
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of Upsilon 1s 2s 3s Production In P P And Au Au Collisions At Sqrt S Mathrm Nn 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.
Measurements of bottomonium production in heavy-ion and p+p collisions at the Relativistic Heavy Ion Collider (RHIC) are presented. The inclusive yield of the three [Upsilon] states, [Upsilon](1S + 2S + 3S), was measured in the PHENIX experiment via electron-positron decay pairs at midrapidity for Au+Au and p+p collisions at \(\sqrt{s_{\mathrm{NN}}}=200\) GeV. The [Upsilon](1S + 2S + 3S) 2!ee− differential cross section at midrapidity was found to be Beed[sigma]/dy = 108 ± 38 (stat) ± 15 (syst) ± 11 (luminosity) pb in p+p collisions. The nuclear modification factor in the 30% most central Au+Au collisions indicates a suppression of the total [Upsilon] state yield relative to the extrapolation from p+p collision data. Thus, the suppression is consistent with measurements at higher energies by the CMS experiment at the Large Hadron Collider.
Search For Resonant Mathrm T Bar T Production In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Resonant Mathrm T Bar T Production 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.
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.
Measurement Of The 1s Pair Production Cross Section And Search For Resonances Decaying To 1s In Proton Proton Collisions At S
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Author : Albert M. Sirunyan
language : en
Publisher:
Release Date : 2020
Measurement Of The 1s Pair Production Cross Section And Search For Resonances Decaying To 1s In Proton Proton Collisions At S written by Albert M. Sirunyan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Search For Pair Production Of First Or Second Generation Leptoquarks In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Search For Pair Production Of First Or Second Generation Leptoquarks 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.
Measurement Of The Upsilon 1s Production Cross Section In Proton Proton Collisions At Center Of Mass Energy 7 Tev
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Author : Maxwell Ian Scherzer
language : en
Publisher:
Release Date : 2011
Measurement Of The Upsilon 1s Production Cross Section In Proton Proton Collisions At Center Of Mass Energy 7 Tev written by Maxwell Ian Scherzer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
A measurement of the cross section for upsilon(1S) production in proton-proton collisions at center of mass energy 7 TeV is presented. The measurement uses the upsilon(1S) 2!mu + mu decay mode and covers up to a transverse momentum of 26 GeV in two bins of rapidity; upsilon(1S) upsilon(1S) -1, collected with the ATLAS detector at the Large Hadron Collider. Templates derived from data are used to model the continuum background. In order to eliminate theoretical uncertainties due to the unknown polarization, the measurement is restricted to the case where both muons have a transverse momentum of p mu T> 4 GeV and a pseudorapidit
Exclusive Photon Photon Production Of Muon Pairs In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Exclusive Photon Photon Production Of Muon 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 2011 with categories.
A measurement of the exclusive two-photon production of muon pairs in proton-proton collisions at √s = 7 TeV, pp → p??−p, is reported using data corresponding to an integrated luminosity of 40 pb−1. For muon pairs with invariant mass greater than 11.5 GeV, transverse momentum p{sub T} > 4 GeV and pseudorapidity.