Measurements Of The Total And Differential Higgs Boson Production Cross Sections Combining The H 2 Gamma Gamma And H 2 Zz 2 4l Decay Channels At Arrow
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Measurements Of The Total And Differential Higgs Boson Production Cross Sections Combining The H 2 Gamma Gamma And H 2 Zz 2 4l Decay Channels At Arrow
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Author :
language : en
Publisher:
Release Date : 2015
Measurements Of The Total And Differential Higgs Boson Production Cross Sections Combining The H 2 Gamma Gamma And H 2 Zz 2 4l Decay Channels At Arrow 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 the total and differential cross sections of Higgs boson production are performed using 20.3 fb-1 of pp collisions produced by the Large Hadron Collider at a center-of-mass energy of [arrow]" = 8 TeV and recorded by the ATLAS detector. Cross sections are obtained from measured H 2![gamma][gamma] and H 2!ZZ* 2!4l event yields, which are combined accounting for detector efficiencies, fiducial acceptances, and branching fractions. Differential cross sections are reported as a function of Higgs boson transverse momentum, Higgs boson rapidity, number of jets in the event, and transverse momentum of the leading jet. The total production cross section is determined to be [sigma]pp2! = 33.0 " 5.3 (stat) " 1.6 (syst) pb. The measurements are compared to state-of-the-art predictions.
Measurements Of The Total And Differential Higgs Boson Production Cross Sections Combining The H U2192 And H U2192 Zz U2192 4l Decay Channels At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Measurements Of The Total And Differential Higgs Boson Production Cross Sections Combining The H U2192 And H U2192 Zz U2192 4l Decay Channels At U221a 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.
Measurements of the total and differential cross sections of Higgs boson production are performed using 20.3 fb-1 of pp collisions produced by the Large Hadron Collider at a center-of-mass energy of √s = 8 TeV and recorded by the ATLAS detector. Cross sections are obtained from measured H → ?? and H → ZZ* → 4l event yields, which are combined accounting for detector efficiencies, fiducial acceptances, and branching fractions. Differential cross sections are reported as a function of Higgs boson transverse momentum, Higgs boson rapidity, number of jets in the event, and transverse momentum of the leading jet. The total production cross section is determined to be ?pp→H = 33.0 ± 5.3 (stat) ± 1.6 (syst) pb. The measurements are compared to state-of-the-art predictions.
The Higgs From A Mu To Z Mu
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Author : Bijan Perry Berton Haney (IV)
language : en
Publisher:
Release Date : 2018
The Higgs From A Mu To Z Mu written by Bijan Perry Berton Haney (IV) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
This thesis presents measurements of the Higgs boson inclusive and differential cross sections with 36.1 fb-1 of proton-proton collision data from the Large Hadron Collider at a center of mass energy of 13 TeV recorded with the ATLAS detector. The cross sections are measured in the fiducial phase space of the H ZZ* 4l (four lepton) decay channel as well as in the total Higgs phase space, combining data from the H ZZ* 4l and H [double gamma] (diphoton) decay channels. These two channels have high sensitivity to the Higgs signal and allow for full reconstruction of the Higgs boson kinematics. Unfolding techniques are used to correct for detector effects in the measurements, and comparisons are made to various state-of-the-art Standard Model theory predictions such as the predicted gluon-gluon fusion total cross section at N3LO and the Higgs differential transverse momentum spectrum at NNLO. These precision measurements are used to set limits on anomalous Higgs boson couplings beyond the Standard Model within the framework of pseudo-observables. In the H ZZ * 4l analysis, the inclusive fiducial Higgs boson cross section is measured to be 3.62 [plus/minus] 0.50 (stat) +0.25/-0.20 (sys) fb, in agreement with the Standard Model prediction of 2.91 [plus/minus] 0.13 fb. In the combined analysis, the inclusive total cross section is measured to be 57.0 +6.0/-5.9 (stat.) +4.0/-3.3 (syst.) pb, in agreement with the Standard Model prediction of of 55.6 [plus/minus] 2.5 pb. Measured differential cross sections are also presented for the Higgs transverse momentum, Higgs rapidity, number of associated jets, leading jet transverse momentum, and other kinematic variables.
Measurement Of Differential Cross Sections For Higgs Boson Production In The Diphoton Decay Channel In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of Differential Cross Sections For Higgs Boson Production In The Diphoton Decay Channel 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 2015 with categories.
We presented a measurement of differential cross sections for the Higgs boson (H) production in pp collisions at √s = 8 TeV. The analysis exploits the H →[gamma][gamma] decay in data corresponding to an integrated luminosity of 19.7 fb-1 collected by the CMS experiment at the LHC. The cross section is measured as a function of the kinematic properties of the diphoton system and of the associated jets. Results corrected for detector effects are compared with predictions at next-to-leading order and nextto-next-to-leading order in perturbative quantum chromodynamics, as well as with predictions beyond the standard model. Furthermore, for isolated photons with pseudorapidities.
Fiducial And Differential Cross Sections Of Higgs Boson Production Measured In The Four Lepton Decay Channel In Pp Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2014
Fiducial And Differential Cross Sections Of Higgs Boson Production Measured In The Four Lepton Decay Channel In Pp Collisions At U221a 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.
Measurements of fiducial and differential cross sections of Higgs boson production in the H→ZZ*→4l decay channel are presented. The cross sections are determined within a fiducial phase space and corrected for detection efficiency and resolution effects. They are based on 20.3 fb-1 of pp collision data, produced at √s = 8 TeV centre-of-mass energy at the LHC and recorded by the ATLAS detector. The differential measurements are performed in bins of transverse momentum and rapidity of the four-lepton system, the invariant mass of the subleading lepton pair and the decay angle of the leading lepton pair with respect to the beam line in the four-lepton rest frame, as well as the number of jets and the transverse momentum of the leading jet. The measured cross sections are compared to selected theoretical calculations of the Standard Model expectations. No significant deviation from any of the tested predictions is found.
Measurement Of Differential And Integrated Fiducial Cross Sections For Higgs Boson Production In The Four Lepton Decay Channel In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of Differential And Integrated Fiducial Cross Sections For Higgs Boson Production In The Four Lepton Decay Channel 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 2016 with categories.
Integrated fiducial cross sections for the production of four leptons via the H → 4l decays (l = e, [mu]) are measured in pp collisions at $ \sqrt{s}=7 $ and 8TeV. Measurements are performed with data corresponding to integrated luminosities of 5.1 fb$^{-1}$ at 7TeV, and 19.7 fb$^{-1}$ at 8 TeV, collected with the CMS experiment at the LHC. Differential cross sections are measured using the 8 TeV data, and are determined as functions of the transverse momentum and rapidity of the four-lepton system, accompanying jet multiplicity, transverse momentum of the leading jet, and difference in rapidity between the Higgs boson candidate and the leading jet. A measurement of the Z → 4l cross section, and its ratio to the H → 4l cross section is also performed. All cross sections are measured within a fiducial phase space defined by the requirements on lepton kinematics and event topology. Here, the integrated H → 4l fiducial cross section is measured to be 0.56$_{-0.44}^{+0.67}$ (stat)$_{-0.06}^{+0.21}$ (syst) fb at 7 TeV, and 1.11$_{-0.35}^{+0.41}$ (stat)$_{-0.10}^{+0.14}$ (syst) fb at 8 TeV. The measurements are found to be compatible with theoretical calculations based on the standard model.
Measurement Of Fiducial Differential Cross Sections Of Gluon Fusion Production Of Higgs Bosons Decaying To Ww 2 E Nu Mu Nu With The Atlas Detector At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of Fiducial Differential Cross Sections Of Gluon Fusion Production Of Higgs Bosons Decaying To Ww 2 E Nu Mu Nu With The Atlas Detector 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.
Here, this paper describes a measurement of fiducial and differential cross sections of gluon-fusion Higgs boson production in the H → WW *→ e[nu][mu][nu] channel, using 20.3 fb-1 of proton-proton collision data. The data were produced at a centre-of-mass energy of √s = 8 TeV at the CERN Large Hadron Collider and recorded by the ATLAS detector in 2012. Cross sections are measured from the observed H→ W W*→ e[nu][mu][nu] signal yield in categories distinguished by the number of associated jets. The total cross section is measured in a fiducial region defined by the kinematic properties of the charged leptons and neutrinos. Differential cross sections are reported as a function of the number of jets, the Higgs boson transverse momentum, the dilepton rapidity, and the transverse momentum of the leading jet. The jet-veto efficiency, or fraction of events with no jets above a given transverse momentum threshold, is also reported. All measurements are compared to QCD predictions from Monte Carlo generators and fixed-order calculations, and are in agreement with the Standard Model predictions.
Combined Measurement Of The Higgs Boson Mass In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Combined Measurement Of The Higgs Boson Mass 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 2015 with categories.
A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the H 2![gamma][gamma] and H 2!ZZ 2!4l decay channels. These results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. We measured masses from the individual channels and the two experiments are found to be consistent among themselves. Furthermore, the combined measured mass of the Higgs boson is mH = 125.09 " 0.21(stat) " 0.11(syst)GeV.
H To Gamma Gamma Search And Direct Photon Pair Production Differential Cross Section
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Author :
language : en
Publisher:
Release Date : 2010
H To Gamma Gamma Search And Direct Photon Pair Production Differential Cross Section written by 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.
At a hadron collider, diphoton ([gamma][gamma]) production allows detailed studies of the Standard Model (SM), as well as as searches for new phenomena, such as new heavy resonances, extra spatial dimensions or cascade decays of heavy new particles. Within the SM, continuum [gamma][gamma]+X production is characterized by a steeply-falling [gamma][gamma] mass spectrum, on top of which a heavy resonance decaying into [gamma][gamma] can potentially be observed. In particular, this is considered one of the most promising discovery channels for a SM Higgs boson at the LHC, despite the small branching ratio of BR (H 2![gamma][gamma]) H"0.2% for 110 M{sub Higgs} 140 GeV. At the Tevatron, the dominant SM Higgs boson production mechanism is gluon fusion, followed by associated production with a W or Z boson, and vector boson fusion. While the SM Higgs production rate at the Tevatron is not sufficient to observe it in the [gamma][gamma] mode, the Hgg and H[gamma][gamma] couplings, being loop-mediated, are particularly sensitive to new physics effects. Furthermore, in some models beyond the SM, for instance, fermiophobic Higgs, with no couplings to fermions, the BR (H 2![gamma][gamma]) can be enhanced significantly relative to the SM prediction, while has the SM-like production cross sections except the gluon fusion is absent. In this thesis, we present a search for a light Higgs boson in the diphoton final state using 4.2 ± 0.3 fb−1 of the D0 Run II data, collected at the Fermilab Tevatron collider from April 2002 to December 2008. Good agreement between the data and the SM background prediction is observed. Since there is no evidence for new physics, we set 95% C.L. limits on the production cross section times the branching ratio ([sigma] x BR(H 2![gamma][gamma])) relative to the SM-like Higgs prediction for different assumed Higgs masses. The observed limits ([sigma](limit)/[sigma](SM)) range from 11.9 to 35.2 for Higgs masses from 100 to 150 GeV, while the expected limits range from 17.5 to 32.0. This search is also interpreted in the context of the particular fermiophobic Higgs model. The corresponding results have reached the same sensitivity as a single LEP experiement, setting a lower limit on the fermiophobic Higgs of M{sub h{sub f}} 102.5 GeV (M{sub h{sub f}} 107.5 GeV expected). We are slightly below the combined LEP limit (M{sub h{sub f}}> 109.7 GeV). We also provide access to the M{sub h{sub f}}> 125 GeV region which was inaccessible at LEP. During the study, we found the major and irreducible background direct [gamma][gamma] (DPP) production is not well modelled by the current theoretical predictions: RESBOS, DIPHOX or PYTHIA. There is H"0% theoretical uncertainty for the predicted values. Thus, for our Higgs search, we use the side-band fitting method to estimate DPP contribution directly from the data events. Furthermore, DPP production is also a significant background in searches for new phenomena, such as new heavy resonances, extra spatial dimensions, or cascade decays of heavy new particles. Thus, precise measurements of the DPP cross sections for various kinematic variables and their theoretical understanding are extremely important for future Higgs and new phenomena searches. In this thesis, we also present a precise measurement of the DPP single differential cross sections as a function of the diphoton mass, the transverse momentum of the diphoton system, the azimuthal angle between the photons, and the polar scattering angle of the photons, as well as the double differential cross sections considering the last three kinematic variables in three diphoton mass bins, using 4.2 fb−1 data. These results are the first of their kind at D0 Run II, and in fact the double differential measurements are the first of their kind at Tevatron. The results are compared with different perturbative QCD predictions and event generators.
Measurement Of Fiducial Differential Cross Sections Of Gluon Fusion Production Of Higgs Bosons Decaying To Ww U2192 E With The Atlas Detector At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of Fiducial Differential Cross Sections Of Gluon Fusion Production Of Higgs Bosons Decaying To Ww U2192 E With The Atlas Detector 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.
Here, this paper describes a measurement of fiducial and differential cross sections of gluon-fusion Higgs boson production in the H → WW *→ e??? channel, using 20.3 fb–1 of proton-proton collision data. The data were produced at a centre-of-mass energy of √s = 8 TeV at the CERN Large Hadron Collider and recorded by the ATLAS detector in 2012. Cross sections are measured from the observed H→ W W*→ e??? signal yield in categories distinguished by the number of associated jets. The total cross section is measured in a fiducial region defined by the kinematic properties of the charged leptons and neutrinos. Differential cross sections are reported as a function of the number of jets, the Higgs boson transverse momentum, the dilepton rapidity, and the transverse momentum of the leading jet. The jet-veto efficiency, or fraction of events with no jets above a given transverse momentum threshold, is also reported. All measurements are compared to QCD predictions from Monte Carlo generators and fixed-order calculations, and are in agreement with the Standard Model predictions.