scholarly journals Calibration and Performance of the CMS Electromagnetic Calorimeter in LHC Run2

2020 ◽  
Vol 245 ◽  
pp. 02027
Author(s):  
Francesca Cavallari ◽  
Chiara Rovelli
Keyword(s):  
Higgs Boson ◽  
Energy Resolution ◽  
Mass Measurement ◽  
Energy Scale ◽  
Boson Mass ◽  
Electromagnetic Calorimeter ◽  
High Mass ◽  
Final State ◽  
Z Boson Decays ◽  
And Performance

Many physics analyses using the Compact Muon Solenoid (CMS) detector at the LHC require accurate, high resolution electron and photon energy measurements. Excellent energy resolution is crucial for studies of Higgs boson decays with electromagnetic particles in the final state, as well as searches for very high mass resonances decaying to energetic photons or electrons. The CMS electromagnetic calorimeter (ECAL) is a fundamental instrument for these analyses and its energy resolution is crucial for the Higgs boson mass measurement. Recently the energy response of the calorimeter has been precisely calibrated exploiting the full Run2 data, aiming at a legacy reprocessing of the data. A dedicated calibration of each detector channel has been performed with physics events exploiting electrons from W and Z boson decays, photons from π0 and η decays, and from the azimuthally symmetric energy distribution of minimum bias events. This talk presents the calibration strategies that have been implemented and the excellent performance achieved by the CMS ECAL with the ultimate calibration of Run2 data, in terms of energy scale stability and energy resolution.

THE ATLAS ELECTROMAGNETIC CALORIMETERS: FEATURES AND PERFORMANCE

2010 ◽  
Vol 25 (09) ◽  
pp. 1739-1760 ◽  
Author(s):  
LUCIANO MANDELLI
Keyword(s):  
Higgs Boson ◽  
Response Time ◽  
Energy Resolution ◽  
Liquid Argon ◽  
Electromagnetic Calorimeter ◽  
Simplified Model ◽  
Energy Position ◽  
And Performance ◽  
Electromagnetic Calorimeters

In this paper it is shown how a sampling electromagnetic calorimeter based on the liquid argon technique satisfies the very demanding requirements of an experiment at the LHC. Section 2 discusses, using a simplified model, the performance that can be achieved in terms of response time, energy resolution and transverse granularity. Section 3 describes how the calorimeters are realized in ATLAS, their segmentation and how from the readout pulses the energy deposited in the calorimeter is computed. The motivations of a presampler detector in front of the calorimeter are also discussed. Section 4 describes how the energy, position and direction of an electron and a photon are computed. Finally, Sec. 5 briefly illustrates the rejection power of the calorimeter against the hadrons and mentions how a Higgs boson signal in the γγ channel can already be detected with a luminosity of 10 fb-1.

The electroweak contributions to(g−2)μafter the Higgs-boson mass measurement

2013 ◽  
Vol 88 (5) ◽  
Author(s):  
C. Gnendiger ◽  
D. Stöckinger ◽  
H. Stöckinger-Kim
Keyword(s):  
Higgs Boson ◽  
Mass Measurement ◽  
Boson Mass ◽  
Higgs Boson Mass

scholarly journals Triply charged Higgs bosons at a 100 TeV pp collider

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Junxing Pan ◽  
Jung-Hsin Chen ◽  
Xiao-Gang He ◽  
Gang Li ◽  
Jhih-Ying Su
Keyword(s):  
Higgs Boson ◽  
Hadron Collider ◽  
Vacuum Expectation ◽  
Vacuum Expectation Value ◽  
Mass Splitting ◽  
Charged Higgs Boson ◽  
Higgs Bosons ◽  
Boson Mass ◽  
Final State ◽  
Charged Higgs

AbstractIn this work, we study the potential of searching for triply charged Higgs boson originating from a complex Higgs quadruplet in the final state with at least three same-sign leptons. A detailed collider analysis of the SM backgrounds and signals is performed at a 100 TeV pp collider for the triply charged Higgs boson mass below 1 TeV and the Higgs quadruplet vacuum expectation value $$v_\Delta $$ v Δ ranging from $$1.5\times 10^{-9}~\text {GeV}$$ 1.5 × 10 - 9 GeV to $$1.3~\text {GeV}$$ 1.3 GeV and the mass splitting $$\Delta m$$ Δ m between the nearby states of the Higgs quadruplet satisfying $$|\Delta m|\lesssim 30~\text {GeV}$$ | Δ m | ≲ 30 GeV . About $$100~\text {fb}^{-1}$$ 100 fb - 1 of data are required at most for $$5\sigma $$ 5 σ discovery. We also revisit the sensitivity at the Large Hadron Collider (LHC) and find that $$5\sigma $$ 5 σ discovery of the triply charged Higgs boson below 1 TeV can be reached for a relatively small $$v_\Delta $$ v Δ . For example, if $$v_\Delta =10^{-6}~\text {GeV}$$ v Δ = 10 - 6 GeV and $$\Delta m=0$$ Δ m = 0 , the integrated luminosity of $$330~\text {fb}^{-1}$$ 330 fb - 1 is needed. But for a relatively large $$v_\Delta $$ v Δ , i.e., $$v_\Delta \gtrsim 10^{-3}~\text {GeV}$$ v Δ ≳ 10 - 3 GeV , the triply charged Higgs boson above about 800 GeV cannot be discovered even in the high-luminosity LHC era. For $$\Delta m>0$$ Δ m > 0 , the cascade decays are open and the sensitivity can be improved depending on the value of $$v_\Delta $$ v Δ .

scholarly journals SiPM dynamic range for CEPC scintillator-based electromagnetic calorimeter

2021 ◽  
Vol 16 (12) ◽  
pp. T12008
Author(s):  
Y. Niu ◽  
Y. Shi ◽  
H. Zhao ◽  
Y. Zhang ◽  
M. Ruan ◽  
...  
Keyword(s):  
Higgs Boson ◽  
Light Pulse ◽  
Dynamic Range ◽  
Detection Efficiency ◽  
Incident Light ◽  
Recovery Period ◽  
Light Yield ◽  
Boson Mass ◽  
Electromagnetic Calorimeter ◽  
The Impact

Abstract A high-granularity scintillator calorimeter readout with silicon photomultipliers (SiPMs) is an electromagnetic calorimeter (ECAL) candidate for experiments at the Circular Electron Positron Collider (CEPC). A critical design parameter of this ECAL candidate is the dynamic range of the SiPMs. This study investigates the SiPM dynamic range required for the CEPC scintillator ECAL. A model is developed on the basis of the operation principles of SiPMs to describe the response of an SiPM to light pulses within one recovery period by considering the cross-talk effect, photon detection efficiency, and number of pixels. The response curve of a 10000-pixel SiPM predicted by the model is consistent with the measured curve within 2% for an incident light pulse of up to 12000 photons. The intrinsic fluctuations of the SiPM response naturally exist in this model, and the correction of the saturation effect in the SiPM response is investigated. Monte Carlo (MC) simulation shows that the algorithm can restore the response linearity of an SiPM for an incident light pulse in which the number of photons is up to around six times the number of SiPM pixels. The model and correction program are implemented for full simulation of the ZH production Z → νν, H → γγ channel to evaluate the impact of the SiPM dynamic range of the CEPC scintillator ECAL on the reconstructed Higgs boson mass and the sensitivity to the Higgs signal in this channel. The results show that the CEPC scintillator ECAL equipped with no less than 4000 SiPM pixels and operated with a light yield of 20 photon-electrons per channel for a single minimum ionizing particle can meet the requirements for Higgs boson precision measurement in the di-photon channel at the CEPC.

Implications of the top quark mass measurement for the SM Higgs boson mass MH

1995 ◽  
Vol 21 (1) ◽  
pp. 19-28 ◽  
Author(s):  
Zhenjun Xiao ◽  
Jinyu Zhang ◽  
Lingde Wan ◽  
Xuelei Wang ◽  
Gongru Lui
Keyword(s):  
Higgs Boson ◽  
Top Quark ◽  
Quark Mass ◽  
Mass Measurement ◽  
Boson Mass ◽  
Higgs Boson Mass ◽  
Top Quark Mass

scholarly journals Comparison of ​horace and ​photos Algorithms for Multiphoton Emission in the Context ofWBoson Mass Measurement

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Ashutosh V. Kotwal ◽  
Bodhitha Jayatilaka
Keyword(s):  
Transverse Momentum ◽  
Virtual Photon ◽  
Mass Measurement ◽  
Photon Emission ◽  
Momentum Spectrum ◽  
Boson Mass ◽  
Real Photon ◽  
Transverse Momentum Spectrum ◽  
Final State ◽  
Measured Mass

Wboson mass measurement is sensitive to QED radiative corrections due to virtual photon loops and real photon emission. The largest shift in the measured mass, which depends on the transverse momentum spectrum of the charged lepton from the boson decay, is caused by the emission of real photons from the final-state lepton. There are a number of calculations and codes available to model the final-state photon emission. We perform a detailed study, comparing the results fromhoraceandphotosimplementations of the final-state multiphoton emission in the context of a direct measurement ofWboson mass at Tevatron. Mass fits are performed using a simulation of the CDF II detector.

scholarly journals A possibility of Lorentz violation in the Higgs sector

2019 ◽  
Vol 35 (10) ◽  
pp. 2050064 ◽  
Author(s):  
Satoshi Iso ◽  
Noriaki Kitazawa
Keyword(s):  
Higgs Boson ◽  
Dimensional Space ◽  
Higgs Field ◽  
Higgs Sector ◽  
Angular Frequency ◽  
Energy Scale ◽  
Boson Mass ◽  
Effective Theory ◽  
Higher Dimensional ◽  
Phenomenological Consequence

In string theory, a scalar field often appears as a moduli of a geometrical configuration of D-branes in higher-dimensional space. In the low energy effective theory on D-branes, the distance between D-branes is translated into the energy scale of the gauge symmetry breaking. In this paper, we study a phenomenological consequence of a possibility that the Higgs field is such a moduli field and the D-brane configuration is stabilized by a stationary motion, in particular, revolution of D-branes on which we live. Then, due to the Coriolis force, Higgs mode is mixed with the angular fluctuation of branes and the Lorentz symmetry is violated in the dispersion relation of the Higgs boson. The Higgs boson mass measurements at LHC experiments give an upper bound [Formula: see text][Formula: see text][Formula: see text] GeV for the angular frequency of the revolution of D-branes.

THE W BOSON MASS MEASUREMENT USING THE COLLIDER DETECTOR AT FERMILAB

2013 ◽  
Vol 28 (13) ◽  
pp. 1330018 ◽  
Author(s):  
YU ZENG
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
W Boson ◽  
Mass Measurement ◽  
Boson Mass ◽  
Future Perspective ◽  
Limiting Factor ◽  
Tevatron Collider ◽  
Final Measurement ◽  
The Standard Model

As one of the most important parameters in the Standard Model (SM), the mass of the W boson (mW) is currently the limiting factor in our ability to tighten the constraint on the mass of the Higgs boson (mH) within the SM framework. This review summarizes the world's most precise mW measurement to date using ~2.2 fb -1 data collected in [Formula: see text] collisions at [Formula: see text] with the CDF II detector at the Fermilab Tevatron Collider. This review will first describe the motivation for improving the precision of mW measurement, then present the details of this analysis, followed by the final measurement result and the future perspective.

scholarly journals The analytical one-loop contributions to Higgs boson mass in the Supersymmetric Standard Model with vector-like particles

2017 ◽  
Vol 32 (33) ◽  
pp. 1745002
Author(s):  
Tianjun Li ◽  
Wenyu Wang ◽  
Xiao-Chuan Wang ◽  
Zhao-Hua Xiong
Keyword(s):  
Higgs Boson ◽  
Standard Model ◽  
Supersymmetric Standard Model ◽  
Higgs Mass ◽  
Energy Scale ◽  
Boson Mass ◽  
Higgs Boson Mass ◽  
Feynman Rules ◽  
The One ◽  
Bilinear Terms

In this paper, we extend the Minimal Supersymmetric Standard Model (MSSM) with additional vector-like particles (VLPs) and compared the differences of mass spectrum and Feynman rules between the MSSM and MSSMV. We analytically calculate the one loop contributions to the Higgs boson mass from the fermions and sfermions in the on shell renormalization scheme. After discussing and numerically analyzing cases without bilinear terms and a case with a (partial) decoupling limit, we find: (i) the corrections depend on the mass splittings between quarks and squarks and between vector-like fermions and their sfermions; (ii) there exists the (partial) decoupling limit, where the VLPs decouple from the electroweak (EW) energy scale, even when one of the VLPs is light around the EW scale. The reason is that the contributions to Higgs mass can be suppressed by the (or partial) decoupling effects, which can make the EW phenomenology different from the MSSM. Moreover, we present some numerical analysis to understand these unique features.

scholarly journals Full two-loop QCD corrections to the Higgs mass in the MSSM with heavy superpartners

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
Emanuele Bagnaschi ◽  
Giuseppe Degrassi ◽  
Sebastian Paßehr ◽  
Pietro Slavich
Keyword(s):  
Higgs Boson ◽  
Higgs Mass ◽  
Mass Measurement ◽  
Boson Mass ◽  
Higgs Boson Mass ◽  
Pole Mass ◽  
Higgs Coupling ◽  
Quartic Coupling ◽  
Gauge Couplings

Abstract We improve the determination of the Higgs-boson mass in the MSSM with heavy superpartners, by computing the two-loop threshold corrections to the quartic Higgs coupling that involve both the strong and the electroweak gauge couplings. Combined with earlier results, this completes the calculation of the two-loop QCD corrections to the quartic coupling at the SUSY scale. We also compare different computations of the relation between the quartic coupling and the pole mass of the Higgs boson at the EW scale. We find that the numerical impact of the new corrections on the prediction for the Higgs mass is modest, but comparable to the accuracy of the Higgs-mass measurement at the LHC.

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