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Articles de revues sur le sujet « LHC, CMS, Higgs, WW »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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1

Schott, Matthias, and Junjie Zhu. "Diboson production in proton–proton collisions at $\sqrt{s} = 7~{\rm TeV}$." International Journal of Modern Physics A 29, no. 26 (2014): 1430053. http://dx.doi.org/10.1142/s0217751x14300531.

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This review summarizes results on the production cross-section measurements of electroweak boson pairs (WW, WZ, ZZ, Wγ and Zγ) at the Large Hadron Collider (LHC) in pp collisions at a center-of-mass energy of [Formula: see text]. The two general-purpose detectors at the LHC, ATLAS and CMS recorded an integrated luminosity of ≈5 fb -1 in 2011, which offered the possibility to study the properties of diboson production to high precision. These measurements test predictions of the Standard Model (SM) in a new energy regime and are crucial for the understanding and the measurement of the SM Higgs boson and other new particles. In this review, special emphasis is drawn on the combination of results from both experiments and a common interpretation with respect to state-of-the-art SM predictions.

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Abdeljalil Habjia. "Synthesis on Heavy Higgs from the Standard Model to 2HDM and Beyond." JOURNAL OF ADVANCES IN PHYSICS 18 (October 13, 2020): 110–42. http://dx.doi.org/10.24297/jap.v18i.8881.

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In the context of particle physics, within the ATLAS and CMS experiments at large hadron collider (LHC), this work presents the discussion of the discovery of a particle compatible with the Higgs boson by the combination of several decay channels, with a mass of the order of 125.5 GeV. With increased statistics, that is the full set of data collected by the ATLAS and CMS experiments at LHC ( s1/2 = 7GeV and s1/2 = 8GeV ), the particle is also discovered individually in the channel h-->γγ with an observed significance of 5.2σ and 4.7σ, respectively. The analysis dedicated to the measurement of the mass mh and signal strength μ which is defined as the ratio of σ(pp --> h) X Br(h-->X) normalized to its Standard Model where X = WW*; ZZ*; γγ ; gg; ff. The combined results in h-->γγ channel gave the measurements: mh = 125:36 ± 0:37Gev, (μ = 1:17 ± 0:3) and the constraint on the width Γ(h) of the Higgs decay of 4.07 MeV at 95%CL. The spin study rejects the hypothesis of spin 2 at 99 %CL. The odd parity (spin parity 0- state) is excluded at more than 98%CL. Within the theoretical and experimental uncertainties accessible at the time of the analysis, all results: channels showing the excess with respect to the background-only hypothesis, measured mass and signal strength, couplings, quantum numbers (JPC), production modes, total and differential cross-sections, are compatible with the Standard Model Higgs boson at 95%CL. Although the Standard Model is one of the theories that have experienced the greatest number of successes to date, it is imperfect. The inability of this model to describe certain phenomena seems to suggest that it is only an approximation of a more general theory. Models beyond the Standard Model, such as 2HDM, MSSM or NMSSM, can compensate some of its limitations and postulate the existence of additional Higgs bosons.

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Dordevic, Milos. "Higgs physics at CMS." EPJ Web of Conferences 222 (2019): 01001. http://dx.doi.org/10.1051/epjconf/201922201001.

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The most recent results of a Higgs boson production and properties from the CMS Collaboration using the LHC Run 1 and Run 2 data are reported. These include analyses of a Higgs boson decaying to a pair of photons, four leptons via Z boson pair decays and the associated production of a Higgs boson with top quark pair, predicted by the Standard Model (SM). The studies of a Higgs boson decays to a pair of bottom quarks, a pair of tau leptons and a charm quark pair are also presented. The Higgs boson production via vector boson fusion (VBF) and decaying to invisible particles is reported here as well. The analysis of a Higgs boson decay to a pair of muons is also presented. The study of a Higgs boson pair production at 13 TeV is performed as well and projections of a Higgs boson self couplings together with the couplings to other particles at the HL-LHC are made.

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Kao, Chung, and Joshua Sayre. "Confirming the LHC Higgs discovery with WW." Physics Letters B 722, no. 4-5 (2013): 324–29. http://dx.doi.org/10.1016/j.physletb.2013.04.028.

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Matteo, Leonardo Di. "Search for Higgs decaying to WW at CMS." Journal of Physics: Conference Series 455 (August 6, 2013): 012030. http://dx.doi.org/10.1088/1742-6596/455/1/012030.

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KINNUNEN, RITVA. "SUSY HIGGS SEARCHES AT THE LHC." International Journal of Modern Physics A 22, no. 31 (2007): 5935–42. http://dx.doi.org/10.1142/s0217751x07039134.

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Searches for the Higgs bosons of the Minimal Supersymmetric Standard Model are discussed at the LHC in the CMS and ATLAS experiments. Results are presented for the scenario which maximizes the mass of the lighter scalar Higgs boson. Low integrated luminosity is assumed.

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Gonzalez Suarez, Rebeca. "Recent CMS results in top and Higgs physics." Modern Physics Letters A 32, no. 29 (2017): 1730026. http://dx.doi.org/10.1142/s0217732317300269.

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After the Higgs boson discovery in 2012, the investigation of its properties and compatibility with the Standard Model predictions is central to the physics program of the LHC experiments. Likewise, the study of the top quark is still relevant at the LHC, more than two decades after its discovery at the Tevatron. Top quarks and Higgs bosons are produced at the LHC on a large scale and share a deep connection based on the large mass of the top quark. Both particles provide an excellent laboratory in which to search for new physics: the measurement of their properties tests the foundations of the Standard Model; and they feature prominently in a variety of exotic signals. The coupling of the Higgs boson to the top quark, a fundamental Standard Model parameter, can only be measured directly in processes where the two particles are produced together. The production of a Higgs boson together with one or two top quarks is also sensitive to several exciting new physics effects. A brief overview of the current experimental status of top quark and Higgs boson physics is presented using results from the CMS Collaboration.

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8

GUNION, JOHN F. "THE ELUSIVE HIGGS BOSON(S)." International Journal of Modern Physics A 25, no. 22 (2010): 4163–77. http://dx.doi.org/10.1142/s0217751x10050512.

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We outline the motivations for having a light Higgs boson with fairly SM-like couplings to WW, ZZ but with unusual decays that elude LEP limits and that will also make its detection at the LHC quite challenging. The Next-to-Minimal Supersymmetric Model provides a very appealing model of this type.

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9

Strologas, John. "Experimental results from CMS." EPJ Web of Conferences 192 (2018): 00005. http://dx.doi.org/10.1051/epjconf/201819200005.

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We present some of the latest results of the CMS experiment, covering analyses in QCD multijet, top, bottom, Higgs, forward/small-x QCD, heavyion, exotic, and supersymmetry physics utilizing LHC integrated luminosity up to ~80 fb-1.

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Mariotti, Chiara. "The Story of a Discovery: How we found the long-sought-after Higgs Boson." Europhysics News 50, no. 5-6 (2019): 24–28. http://dx.doi.org/10.1051/epn/2019502.

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The Higgs boson has been discovered in 2012 by the ATLAS and CMS experiments at the LHC, 50 years after its prediction. The scientific and human adventure of this discovery will be summarized in this article, going back to the search at LEP and to the foundation of the LHC Higgs Cross Section working group.

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11

Zghiche, Amina. "Optimizing the performance of the CMS Electromagnetic Calorimeter to measure Higgs properties during Phase I and Phase II of the LHC." International Journal of Modern Physics A 35, no. 34n35 (2020): 2044011. http://dx.doi.org/10.1142/s0217751x2044011x.

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The CMS Electromagnetic Calorimeter (ECAL), is a high granularity lead tungstate (PbWO4) crystal calorimeter operating at the CERN LHC. The ECAL performance has been crucial in the discovery and subsequent characterization of the Higgs boson. The original ECAL design considerations, and the improvements to the energy reconstruction and energy calibration algorithms to cope with the LHC Run II are described. For the High-Luminosity LHC (HL-LHC) upgrades to ECAL are necessary. The crystals in the barrel region will be retained, defining the HL-LHC CMS barrel electromagnetic calorimeter ECAL. The readout electronics will be upgraded and operating at lower temperatures, to maintain the required performance of ECAL from 2027 onwards. The new readout electronics, the timing resolution and the electron and photon reconstruction efficiencies and energy resolution expected for HL-LHC are presented. The performance relevant to a number of key Higgs decay channels is reported.

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12

Dissertori, G. "The pre-LHC Higgs hunt." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 373, no. 2032 (2015): 20140039. http://dx.doi.org/10.1098/rsta.2014.0039.

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Enormous efforts at accelerators and experiments all around the world have gone into the search for the long-sought Higgs boson, postulated almost five decades ago. This search has culminated in the discovery of a Higgs-like particle by the ATLAS and CMS experiments at CERN's Large Hadron Collider in 2012. Instead of describing this widely celebrated discovery, in this article I will rather focus on earlier attempts to discover the Higgs boson, or to constrain the range of possible masses by interpreting precise data in the context of the Standard Model of particle physics. In particular, I will focus on the experimental efforts carried out during the last two decades, at the Large Electron Positron collider, CERN, Geneva, Switzerland, and the Tevatron collider, Fermilab, near Chicago, IL, USA.

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Alexakhin, Vadim. "CMS: Physics overview." EPJ Web of Conferences 204 (2019): 01012. http://dx.doi.org/10.1051/epjconf/201920401012.

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An overview of physics results from the CMS experiment at the LHC is given. The present analysis is based on data obtained for colliding proton beams at the c.m. energies of $\rad{}{s} = 8$ and 13 TeV over the period of LHC Run-1 and Run-2. New unique data on interactions of Standard Model particles at record energies were obtained in the course of the first run of LHC operation. The Higgs boson was discovered, and investigation of its properties was initiated. Measurements were performed for Standard Model processes, including rare and one previously unobserved. This allowed one to refine some parameters of the Standard Model and set limits on the parameters of some theoretical models beyond the Standard Model, for example, on the masses of new particles, the fundamental energy scales, the coupling constants, and the cross sections for the new particles production.

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14

Taševský, Marek. "Review of central exclusive production of the Higgs boson beyond the Standard Model." International Journal of Modern Physics A 29, no. 28 (2014): 1446012. http://dx.doi.org/10.1142/s0217751x14460129.

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We review activities in the field of theoretical, phenomenological and experimental studies related to the production of the Higgs boson in central exclusive processes at LHC in models beyond Standard Model. Prospects in the context of the Higgs boson discovery at LHC in 2012 and of proposals to build forward proton detectors at ATLAS and CMS side are summarized.

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JAKOBS, KARL, and MARKUS SCHUMACHER. "PROSPECTS FOR HIGGS BOSON SEARCHES AT THE LHC." International Journal of Modern Physics A 23, no. 32 (2008): 5093–115. http://dx.doi.org/10.1142/s0217751x08042808.

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The investigation of the dynamics responsible for electroweak symmetry breaking is one of the prime tasks of experiments at the CERN Large Hadron Collider (LHC). The experiments ATLAS and CMS have been designed to be able to discover a Standard Model Higgs boson over the full mass range as well as Higgs bosons in extended models. In this paper, the prospects for Higgs boson searches at the LHC are reviewed. In addition, the potential for the measurement of Higgs boson parameters is discussed.

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Biekötter, T., M. Chakraborti, and S. Heinemeyer. "The “96 GeV excess” at the LHC." International Journal of Modern Physics A 36, no. 22 (2021): 2142018. http://dx.doi.org/10.1142/s0217751x21420185.

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The CMS collaboration reported an intriguing [Formula: see text] (local) excess at 96 GeV in the light Higgs-boson search in the diphoton decay mode. This mass coincides with a [Formula: see text] (local) excess in the [Formula: see text] final state at LEP. We briefly review the proposed combined interpretations for the two excesses. In more detail, we review the interpretation of this possible signal as the lightest Higgs boson in the 2 Higgs Doublet Model with an additional real Higgs singlet (N2HDM). We show which channels have the best prospects for the discovery of additional Higgs bosons at the upcoming Run 3 of the LHC.

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Tao, Junquan. "Search for rare and exotic Higgs Boson decay modes." EPJ Web of Conferences 182 (2018): 02123. http://dx.doi.org/10.1051/epjconf/201818202123.

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The latest results in the search for rare and exotic Higgs boson decays in proton-proton collision events collected with the CMS detector at the LHC are presented. The searches are performed for several decay modes of Higgs boson including H → X(X → 2ℓ)γ (X = Z, γ* and ℓ = e, μ), H → μμ=ee, invisible decays, lepton flavour violating decays and Higgs decay to light scalars or pseudo-scalars. No hint for new physics has been found from the analyzed results with the full LHC run-1 data collected during 2011 and 2012 at √s = 7-8 TeV and with the run-2 data at √s = 13 TeV collected during 2015 and 2016. Limits are set for all the searches which have been performed by CMS.

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Royon, Christophe. "Exclusive Diffraction at the LHC On behalf of the ATLAS, LHCb, CMS and TOTEM experiments." EPJ Web of Conferences 235 (2020): 06001. http://dx.doi.org/10.1051/epjconf/202023506001.

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In this report, we describe the most recent results on exclusive diffraction from the ATLAS, CMS, LHCb, TOTEM experiments at the LHC concerning exclusive pions, J/Ψ, Ψ(2S ), dilepton, diphoton, WW productions and prospects concerning the search for anomalous couplings and axion-like particle production.

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19

Heinemeyer, S., A. Nikitenko, and G. Weiglein. "Heavy MSSM Higgs Bosons at CMS: ‘LHC wedge’ and Higgs-Mass precision." Journal of Physics: Conference Series 110, no. 7 (2008): 072047. http://dx.doi.org/10.1088/1742-6596/110/7/072047.

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20

BHATTACHARYA, SATYAKI. "Higgs Search with the Compact Muon Solenoid(CMS) detector at the Large Hadron Collider(LHC)." International Journal of Modern Physics A 20, no. 15 (2005): 3400–3402. http://dx.doi.org/10.1142/s0217751x05026649.

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The Large Hadron Collider(LHC) is a proton proton collider being built at CERN, Geneva which will collide two 7 TeV proton beams giving a center of mass energy of 14 TeV. The Compact Muon Solenoid (CMS) is a multi-purpose detector at the LHC which is designed to discover the Higgs boson over the mass range of 90 to 1000 GeV. Since LEP searches have put a 95% C.L. lower bound on (standard model) Higgs mass of 114.4 GeV and theory excludes mass above about 1 TeV, CMS should discover the Higgs if it exists. In this paper, we will review CMS's Higgs-discovery potential both in the Standard Model and the Minimal Supersymmetric Standard Model for Higgs bosons produced in gluon-gluon fusion and in vector boson fusion mechanisms. Particular emphasis will be placed on discovery in the early years of running with luminosity of about 2 × 1033cm-2/s.

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Jenni, Peter. "The long journey to the Higgs boson and beyond at the LHC: Emphasis on ATLAS." International Journal of Modern Physics A 31, no. 25 (2016): 1630041. http://dx.doi.org/10.1142/s0217751x16300416.

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The journey in search for the Higgs boson with the ATLAS and CMS experiments at the Large Hadron Collider (LHC) at CERN started more than two decades ago. But the first discussions motivating the LHC project dream date back even further into the 1980s. This article will recall some of these early historical considerations, mention some of the LHC machine milestones and achievements, focus as an example of a technological challenge on the unique ATLAS superconducting magnet system, and then give an account of the physics results so far, leading to, and featuring particularly, the Higgs boson results, and sketching finally prospects for the future. With its emphasis on the ATLAS experiment it is complementary to the preceding article by Tejinder S. Virdee which focused on the CMS experiment.

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YU, Intae. "LHC CMS Experiment and Discovery of the Higgs Particle." Physics and High Technology 22, no. 6 (2013): 22. http://dx.doi.org/10.3938/phit.22.028.

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23

Veatch, Jason. "Searches for Resonant Scalar Boson Pair Production Using Run 2 LHC Proton-Proton Collision Data." Symmetry 14, no. 2 (2022): 260. http://dx.doi.org/10.3390/sym14020260.

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The discovery of the Higgs boson in 2012 provided confirmation of spontaneous electroweak symmetry breaking as the mechanism by which fundamental particles gain mass and thus completed the Standard Model of particle physics. Additionally, it opened a new approach to searching for potential new particles. Many beyond the Standard Model theories predict new heavy particles that couple to the Higgs boson, leading to a resonant production mode of Higgs boson pairs. Other theories extend the Higgs sector by introducing additional scalar bosons that differ from the observed Higgs boson only by mass. The ATLAS and CMS Collaborations have searched for evidence of such processes using s=13 TeV Run 2 proton-proton collision data at the Large Hadron Collider. This review article summarizes the latest experimental results from searches for resonant production of pairs of Higgs bosons or additional Higgs-like scalar bosons at ATLAS and CMS.

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HE, XIAO-GANG, SIAO-FONG LI та HSIU-HSIEN LIN. "FURTHER STUDIES OF HIGGS PROPERTIES AT AN ILC γγ COLLIDER". Modern Physics Letters A 28, № 18 (2013): 1350085. http://dx.doi.org/10.1142/s0217732313500855.

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Recently the ATLAS and CMS experiments at the LHC have found a Higgs-like boson h with a mass around 125 GeV from several decay modes. The decay mode h →γγ is one of the most important modes in studying whether h is actually the Standard Model (SM) Higgs boson. Current data indicate that h→γγ has a branching ratio larger than the SM prediction for h being identified as the SM Higgs boson. To decide whether the h discovered at the LHC is the SM Higgs boson, more data are needed. We study how γγ collider can help to provide some of the most important information about the Higgs boson properties. We show that a γγ collider can easily verify whether the enhanced h →γγ observed at the LHC hold. Different models can be tested by studying Higgs boson decay to γZ. Studying angular distribution of the γγ through on-shell production of h and its subsequent decays into a γγ pair can decide whether the Higgs-like boson h at the LHC is a spin-0 or a spin-2 boson.

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Ressegotti, Martina. "Overview of the CMS Detector Performance at LHC Run 2." Universe 5, no. 1 (2019): 18. http://dx.doi.org/10.3390/universe5010018.

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The Compact Muon Solenoid (CMS) detector is one of the two multipurpose experiments at the Large Hadron Collider (LHC). It has successfully collected data during Run 1 (2010–2013) and achieved important physics results, like the discovery of the Higgs boson announced in 2012. Willing to unravel further open questions not yet explained by the standard model, intense activities have been performed to further improve the detector and the trigger before the LHC restart in 2016 (Run 2), in parallel with the upgrade of the LHC. The achieved global performance of the CMS experiment and of several subdetectors will be presented.

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Binoth, T., M. Ciccolini, N. Kauer, and M. Krämer. "Gluon-induced WW background to Higgs boson searches at the LHC." Journal of High Energy Physics 2005, no. 03 (2005): 065. http://dx.doi.org/10.1088/1126-6708/2005/03/065.

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ASAI, S. "THE LATEST STATUS OF LHC AND THE EWSB PHYSICS." International Journal of Modern Physics A 25, no. 27n28 (2010): 5196–209. http://dx.doi.org/10.1142/s0217751x10050962.

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The latest status of LHC and the performances of ATLAS and CMS detectors are summarized in the first part. Physics potential to solve the origin of the ElectroWeak Symmetry Breaking is summarized in the 2nd part, focusing especially on two major scenarios, (1) the light Higgs boson plus SUSY and (2) the Strong Coupling Gauge Theory. Both ATLAS and CMS detectors have the excellent potential to discover them, and we can perform crucial test on the ElectroWeak Symmetry Breaking.

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Botta, Valeria. "Measurements of the Higgs H(125) boson at CMS." EPJ Web of Conferences 182 (2018): 02018. http://dx.doi.org/10.1051/epjconf/201818202018.

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The most recent measurements of the Higgs H(125) boson in several final states, including decays to bosons, fermions, and the associated production of a Higgs boson with top quarks, are reviewed. Results have been obtained analysing the protonproton collision data collected with the CMS detector at the Large Hadron Collider (LHC) in 2016, corresponding to an integrated luminosity of 35.9 fb-1 at a centre-of-mass energy of 13 TeV.

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ENGLERT, CHRISTOPH. "NON-STANDARD HIGGS AND mh≃125 GeV." Modern Physics Letters A 27, no. 34 (2012): 1230035. http://dx.doi.org/10.1142/s0217732312300352.

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We review non-Standard Model Higgs signatures which are missed in standard analyses by both ATLAS and CMS and show how the strong bounds by recent measurements can be relaxed in strongly-interacting theories. We also review strategies how to measure or constrain exotic Higgs decay at the LHC and a future linear collider.

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Horváth, Dezso. "Higgs and BSM Studies at the LHC." Universe 5, no. 7 (2019): 160. http://dx.doi.org/10.3390/universe5070160.

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The discovery and study of the Higgs boson at the Large Hadron Collider of CERN has proven the validity of the Brout–Englert–Higgs mechanism of mass creation in the standard model via spontaneous symmetry breaking. The new results obtained by the ATLAS and CMS Collaborations at the LHC show that all measured cross-sections agree within uncertainties with the predictions of the theory. However, the standard model has obvious difficulties (nonzero neutrino masses, hierarchy problem, existence of dark matter, non-existence of antimatter galaxies, etc.), which point towards more possible violated symmetries. We first summarize the present status of the studies of the Higgs boson, including the latest results at 13 TeV p-p collision energy, then enlist some of the problems with possible solutions and the experimental situation regarding them.

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Kole, Gouranga. "Search for Additional Higgs Boson with CMS Detector at LHC." Moscow University Physics Bulletin 77, no. 2 (2022): 223–25. http://dx.doi.org/10.3103/s0027134922020527.

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Horváth, Dezső. "Twenty years of searching for the Higgs boson: Exclusion at LEP, discovery at LHC." Modern Physics Letters A 29, no. 04 (2014): 1430004. http://dx.doi.org/10.1142/s0217732314300043.

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The 40 years old Standard Model, the theory of particle physics, seems to describe all experimental data very well. All of its elementary particles were identified and studied apart from the Higgs boson until 2012. For decades, many experiments were built and operated searching for it, and finally, the two main experiments of the Large Hadron Collider (LHC) at CERN, CMS and ATLAS, in 2012 observed a new particle with properties close to those predicted for the Higgs boson. In this paper, we outline the search story: the exclusion of the Higgs boson at the Large Electron Positron (LEP) collider, and its observation at LHC.

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Mariotti, Chiara, and Giampiero Passarino. "Higgs boson couplings: Measurements and theoretical interpretation." International Journal of Modern Physics A 32, no. 04 (2017): 1730003. http://dx.doi.org/10.1142/s0217751x17300034.

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This report will review the Higgs boson properties: the mass, the total width and the couplings to fermions and bosons. The measurements have been performed with the data collected in 2011 and 2012 at the LHC accelerator at CERN by the ATLAS and CMS experiments. Theoretical frameworks to search for new physics are also introduced and discussed.

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Straessner, Arno. "HIGHLIGHTS FROM THE LHC." Acta Polytechnica 53, A (2013): 518–23. http://dx.doi.org/10.14311/ap.2013.53.0518.

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The Large Hadron Collider (LHC) and the two multi-purpose detectors, ATLAS and CMS, have been operated successfully at record centre-of-mass energies of 7 ÷ 8TeV. This paper presents the main physics results from proton–proton collisions based on a total luminosity of 2 × 5 fb<sup>−1</sup>. The most recent results from Standard Model measurements, Standard Model and MSSM Higgs searches, as well as searches for supersymmetric and exotic particles are reported. Prospects for ongoing and future data taking are presented.

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Cavallari, Francesca, and Chiara Rovelli. "Calibration and Performance of the CMS Electromagnetic Calorimeter in LHC Run2." EPJ Web of Conferences 245 (2020): 02027. http://dx.doi.org/10.1051/epjconf/202024502027.

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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.

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Salfeld-Nebgen, Jakob. "Search for the Higgs Boson decaying into tau pairs." International Journal of Modern Physics: Conference Series 31 (January 2014): 1460303. http://dx.doi.org/10.1142/s2010194514603032.

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A search for the Standard Model Higgs Boson decaying into τ pairs is performed using events recorded by the CMS experiment at the LHC in 2011 and 2012. An excess of events is observed over a broad range of Higgs mass hypotheses, with a maximum local significance of 2.93 standard deviations at mH = 120 GeV. The excess is compatible with the presence of a standard-model Higgs boson of mass 125 GeV/c2.

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Vachon, Brigitte. "Exploring the Standard Model at the LHC." International Journal of Modern Physics A 31, no. 23 (2016): 1630034. http://dx.doi.org/10.1142/s0217751x16300349.

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The ATLAS and CMS collaborations have performed studies of a wide range of Standard Model processes using data collected at the Large Hadron Collider at center-of-mass energies of 7, 8 and 13 TeV. These measurements are used to explore the Standard Model in a new kinematic regime, perform precision tests of the model, determine some of its fundamental parameters, constrain the proton parton distribution functions, and study new rare processes observed for the first time. Examples of recent Standard Model measurements performed by the ATLAS and CMS collaborations are summarized in this report. The measurements presented span a wide range of event final states including jets, photons, W/Z bosons, top quarks, and Higgs bosons.

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TAO, JUN-QUAN, YU-QIAO SHEN, JIA-WEI FAN та ін. "EFFECT FROM THE GLUON-FUSION SIGNAL AND BACKGROUND INTERFERENCE FOR HIGGS DECAYING TO γγ ANALYSIS AT THE LHC". Modern Physics Letters A 28, № 18 (2013): 1350081. http://dx.doi.org/10.1142/s0217732313500818.

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We calculate the destructive interference factors between the Higgs decay H→γγ produced in gluon-fusion and the Standard Model (SM) continuum gg→γγ process, as a function of the scattering angle in the center-of-mass frame of the final two photons. The interference factors are studied with the selections based on the acceptance criteria of the ATLAS and CMS H→γγ searches at the LHC. The result shows that the destructive interference is only at an order of 2.5% for the SM Higgs analysis at the LHC. The factors are almost the same for the same Higgs mass hypothesis but with different proton–proton collisions at [Formula: see text], 8 TeV, 13 TeV and 14 TeV. The destructive interference is far below the present uncertainty on the total cross-section prediction of Higgs, which is about 15% used at the LHC. A destructive interference factor of -2.5% is suggested to be used in the H→γγ analysis at the LHC, due to the effect from the interference for this decay channel.

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Bortoletto, Daniela. "The importance of silicon detectors for the Higgs boson discovery and the study of its properties." Modern Physics Letters A 29, no. 38 (2014): 1430041. http://dx.doi.org/10.1142/s0217732314300419.

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Recent studies are presented demonstrating the important role played by silicon detectors in the discovery of the Higgs boson. CMS is planning to replace it in an extended technical stop of the LHC in the winter of 2016. We present results showing that this replacement will significantly increase the sample of Higgs bosons that will be reconstructed enabling precision studies of this particle.

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Virdee, Tejinder S. "The quest for the Higgs boson at the LHC." International Journal of Modern Physics A 29, no. 09 (2014): 1430019. http://dx.doi.org/10.1142/s0217751x14300191.

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In July 2012 the ATLAS and CMS experiments announced the discovery of a Higgs boson, confirming the conjecture put forward by Tom Kibble and others in the 1960s. This article will attempt to outline some of the challenges faced during the construction of the Large Hadron Collider and its experiments, their operation and performance, and selected physics results. In particular, results relating to the new heavy boson will be discussed as well as its properties and the future prospects for the LHC programme.

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Sanz, Verónica. "On the Compatibility of the Diboson Excess with agg-Initiated Composite Sector." Advances in High Energy Physics 2016 (2016): 1–8. http://dx.doi.org/10.1155/2016/3279568.

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We propose that recent results by ATLAS and CMS searching for heavy resonances decaying into bosons could be a first hint of a new sector of pure gauge confining physics, possibly linked to the origin of the Higgs as a Composite Higgs. The lightest resonances (glueballs) of this new sector would be neutral, spin-zero, and spin-two, and their behaviour would resemble that of a radion and a massive graviton of extra dimensions. We outline how 13 TeV LHC data could be used to improve sensitivity on this scenario, as well as future characterization during the 13 TeV LHC run.

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WANG, JIAN, GUOMING CHEN, and WEIMIN WU. "THE IMPACT OF LO, NLO AND NNLO FOR THE HIGGS SEARCHING AT $\sqrt{s} = 7$ TeV OF LHC." Modern Physics Letters A 25, no. 36 (2010): 3027–31. http://dx.doi.org/10.1142/s0217732310034146.

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Most of current Monte Carlo studies on the Higgs searching are based on LO, or NLO calculation. However, in recent years, the next-to-next-to-leading order (NNLO) corrections have been computed for some physics process, and found that the cross section increases the kinematics changes. As the results, the analysis results could be impacted by these high order QCD corrections. We use standard Monte Carlo generator for LO, as well as MC@NLO for NLO and ResBos for NNLO at 7 TeV of LHC to evaluate this impact for physics channel of the Higgs, mass at 165 GeV, to WW, then W decay to lepton and neutrino as the final states. We found the signal rate could be effected by ratio of 1:2.6:3.4 for LO, NLO and NNLO using the same standard H→WW→lνlν searching analysis process.6

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DASKALAKIS, GEORGIOS. "CMS ECAL PERFORMANCE - TESTBEAM RESULTS." International Journal of Modern Physics A 20, no. 16 (2005): 3823–25. http://dx.doi.org/10.1142/s0217751x05027722.

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The Compact Muon Solenoid (CMS) experiment is a general-purpose detector designed to explore the physics of proton-proton collisions at a centre-of-mass energy of 14 TeV over the full range of luminosities expected at the Large Hadron Collider (LHC). The Electromagnetic Calorimeter (ECAL) will play an essential role in the study of the electroweak symmetry breaking, particularly through the exploration of the Higgs boson sector. To evaluate its characteristics, an ECAL prototype was placed in an electron testbeam at CERN. Highlights of results obtained during the test beam campaign are presented.

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Bhat, Pushpalatha C. "Observation of a Higgs-like Boson in CMS at the LHC." Nuclear Physics B - Proceedings Supplements 234 (January 2013): 7–14. http://dx.doi.org/10.1016/j.nuclphysbps.2012.11.003.

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Virdee, Tejinder Singh. "The long journey to the Higgs boson and beyond at the LHC: Emphasis on CMS." International Journal of Modern Physics A 31, no. 32 (2016): 1630058. http://dx.doi.org/10.1142/s0217751x16300581.

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Since 2010 there has been a rich harvest of results on standard model physics by the ATLAS and CMS experiments operating on the Large Hadron Collider. In the summer of 2012, a spectacular discovery was made by these experiments of a new, heavy particle. All the subsequently analysed data point strongly to the properties of this particle as those expected for the Higgs boson associated with the Brout–Englert–Higgs mechanism postulated to explain the spontaneous symmetry breaking in the electroweak sector, thereby explaining how elementary particles acquire mass. This article focuses on the CMS experiment, the technological challenges encountered in its construction, describing some of the physics results obtained so far, including the discovery of the Higgs boson, and searches for the widely anticipated new physics beyond the standard model, and peer into the future involving the high-luminosity phase of the LHC. This article is complementary to the one by Peter Jenni4 that focuses on the ATLAS experiment.

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NAHN, STEVE, and DMITRI TSYBYCHEV. "RECENT RESULTS FROM ATLAS AND CMS ON HIGGS, SUPERSYMMETRY AND PHYSICS BEYOND THE STANDARD MODEL SEARCHES." International Journal of Modern Physics A 28, no. 16 (2013): 1330026. http://dx.doi.org/10.1142/s0217751x13300263.

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The large hadron collider (LHC) physics program is finally on the way to help uncover the mechanism responsible for electroweak symmetry breaking, with each of experiments collecting up to 5 fb-1 of data at center-of-mass energy of 7 TeV. In this review, we summarize searches for physics beyond the Standard Model at ATLAS and CMS experiments at LHC.

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Heinemeyer, S. "A Higgs boson below 125 GeV?!" International Journal of Modern Physics A 33, no. 31 (2018): 1844006. http://dx.doi.org/10.1142/s0217751x18440062.

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We briefly summarize some searches for Higgs bosons with a mass of [Formula: see text] GeV at LEP and the LHC. We discuss a possible signal in the diphoton decay mode at [Formula: see text] GeV as reported by CMS, together with a [Formula: see text] hint in the [Formula: see text] final state at LEP. We briefly review possible interpretation of such a new particle in various BSM models. We focus on possible explanations as reported within the NMSSM and the [Formula: see text]SSM. Conclusions for future collider projects are briefly outlined.

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Nisati, Aleandro. "The Discovery of a Higgs Particle at the Large Hadron Collider." European Review 23, no. 1 (2015): 57–70. http://dx.doi.org/10.1017/s1062798714000544.

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The Large Hadron Collider (LHC) at CERN is the highest energy machine for particle physics research ever built. In the years 2010–2012 this accelerator has collided protons to a centre-mass-energy up to 8 TeV (note that 1 TeV corresponds to the energy of about 1000 protons at rest; the mass of one proton is about 1.67×10–24 g). The events delivered by the LHC have been collected and analysed by four apparatuses placed alongside this machine. The search for the Higgs boson predicted by the Standard Model and the search for new particles and fields beyond this theory represent the most important points of the scientific programme of the LHC. In July 2012, the international collaborations ATLAS and CMS, consisting of more than 3000 physicists, announced the discovery of a new neutral particle with a mass of about 125 GeV, whose physics properties are compatible, within present experimental and theoretical uncertainties, to the Higgs boson predicted by the Standard Model. This discovery represents a major milestone for particle physics, since it indicates that the hypothesized Higgs mechanism seems to be responsible for the masses of elementary particles, in particular W± and Z0 bosons, as well as fermions (leptons and quarks). The 2013 Physics Nobel Prize has been assigned to F. Englert and P. Higgs, ‘for the theoretical discovery of a mechanism that contributes to our understanding of the origin of mass of subatomic particles, and which recently was confirmed through the discovery of the predicted fundamental particle, by the ATLAS and CMS experiments at CERN's Large Hadron Collider’.

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Davatz, G., M. Dittmar та A.-S. Giolo-Nicollerat. "Standard Model Higgs discovery potential of CMS in the H → WW → ellνellν channel". Journal of Physics G: Nuclear and Particle Physics 34, № 3 (2007): N85—N104. http://dx.doi.org/10.1088/0954-3899/34/3/n03.

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Hadef, Asma. "tt̄H Coupling Measurement with the ATLAS Detector at the LHC." EPJ Web of Conferences 182 (2018): 02052. http://dx.doi.org/10.1051/epjconf/201818202052.

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The Higgs boson was discovered on the 4th of July 2012 with a mass around 125 GeV by ATLAS and CMS experiments at LHC. Determining the Higgs properties (production and decay modes, couplings,...) is an important part of the high-energy physics programme in this decade. A search for the Higgs boson production in association with a top quark pair (tt̄H) at ATLAS [1] is summarized in this paper at an unexplored center-of-mass energy of 13 TeV, which could allow a first direct measurement of the top quark Yukawa coupling and could reveal new physics. The tt̄H analysis in ATLAS is divided into 3 channels according to the Higgs decay modes: H → Hadrons, H → Leptons and H → Photons. The best-fit value of the ratio of observed and Standard Model cross sections of tt̄H production process, using 2015-2016 data and combining all tt̄H final states, is 1:8±0:7, corresponds to 2:8σ (1:8σ) observed (expected) significance.

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