Relevant bibliographies by topics / Di-Higgs

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Di-Higgs'

Author: Grafiati
Published: 25 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "Di-Higgs"

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Kang, Zhaofeng. "Bound states via Higgs exchanging and heavy resonant di-Higgs." Physics Letters B 771 (August 2017): 313–17. http://dx.doi.org/10.1016/j.physletb.2017.05.062.

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Abi Hasan. "JUAL BELI CHIP GAME SEBAGAI JUDI DALAM FATWA MPU ACEH (Kajian Pasal 18 Qanun Nomor 6 Tahun 2014 tentang Hukum Jinayat Aceh)." Legalite : Jurnal Perundang Undangan dan Hukum Pidana Islam 5, no. 2 (December 19, 2020): 96–109. http://dx.doi.org/10.32505/legalite.v5i2.3516.

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Judi pada dasarnya telah di atur dalam perundang-undangan di Indonesia, bahkan daerah Aceh telah merumuskan aturan judi secara konkrit dalam Qanun No. 6 Tahun 2014. Dewasa ini, Games Higgs Domino menjadi marak dimainkan di kalangan pemuda Aceh, sehingga sangat meresahkan masyarakat, karena games tersebut mulai disalahgunakan dengan cara menjual dan membeli Chip yang ada di dalam game. Begitu meresahkan games tersebut membuat ulama Aceh turun tangan dan mengeluarkan fatwa bahwa haram hukumnya jual beli Chip games tersebut dan bahkan mengkategorikannya sebagai judi, sehingga para pelaku bisa dikenakan sanksi cambuk sebagaimana yang telah diatur dalam Qanun Jinayat Aceh. Kasus-kasus penangkapan terhadap para pelaku jual beli Chip Games Higgs Domino sudah merebak di seluruh wilayah Aceh baik oleh pihak ke polisian atau pun pihak WH (Wilayatul Hisbah) selaku keamanan dalam Qanun Jinayat Aceh, dengan dasar telah melanggar ketentuan Syari’at Islam yang berlaku di Aceh. Penelitian ini ingin menganalisis terkait maraknya penangkapan pelaku jual beli Chip Games Higgs Domino, ditinjau berdasarkan Qanun Jinayat Aceh, karena aturan yang terdapat dalam qanun tersebut telah memberikan pembatasan terhadap jarimah judi. Lebih ringkasnya tulisan dalam jurnal ini ingin menjelaskan terkait poin-poin sebagai berikut: 1). Apa yang melatarbelakangi MPU Aceh mengkategorikan jual beli Chip Games Higgs Domino sebagai judi. 2) Memberikan hasil analisis terkait jual beli Chip Games Higgs Domino sebagai jarimah maisir di Aceh menurut fatwa MPU dengan ketentuan yang terdapat dalam qanun jinayat Aceh.
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Lü, Lan-Chun, Chun Du, Yaquan Fang, Hong-Jian He, and Huijun Zhang. "Searching heavier Higgs boson via di-Higgs production at LHC Run-2." Physics Letters B 755 (April 2016): 509–22. http://dx.doi.org/10.1016/j.physletb.2016.02.026.

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Paraskevopoulos, Christos. "Measurement of the Higgs quartic coupling c 2 v from di-Higgs Vector Boson Fusion in the bb¯τ+τ− channel." Journal of Physics: Conference Series 2375, no. 1 (November 1, 2022): 012009. http://dx.doi.org/10.1088/1742-6596/2375/1/012009.

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Abstract The Brout Englert Higgs (BEH) mechanism of electroweak symmetry breaking and mass generation was experimentally confirmed after the discovery of the Higgs boson at the Large Hadron Collider in 2012. The BEH mechanism not only predicts the existence of a massive scalar particle, but also requires this scalar particle to couple to itself. Double Higgs production provides a unique handle, since it allows the extraction of the trilinear Higgs self-coupling. VBF di-Higgs production also probes the quartic Higgs bosons to vector bosons coupling (c 2 v). In this topic the effort on setting constraints on c 2 v will be discussed. Event selection and reconstruction will be illustrated as well as a Neural Network designed to identify VBF events.
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Flacke, Thomas. "Searching for composite Higgs models at the LHC." International Journal of Modern Physics A 31, no. 19 (July 7, 2016): 1630026. http://dx.doi.org/10.1142/s0217751x1630026x.

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Composite Higgs models have the potential to provide a solution to the hierarchy problem and a dynamical explanation for the generation of the Higgs potential. They can be tested at the LHC as the new sector which underlies electroweak symmetry breaking must become strong in the TeV regime, which implies additional bound states beyond the Higgs. In this paper, we first discuss prospects and search strategies for top partners (and other quark partners) in the strongly coupled sector, which we study in an effective field theory setup. In the second part of the proceedings, we go beyond the effective field theory approach. We discuss potential UV embeddings for composite Higgs models which contain a Higgs as well as top partners. We show that in all of these models, additional pseudo-Nambu–Goldstone bosons beyond the Higgs are present. In particular, all of the models contain a pseudoscalar which couples to the Standard Model gauge fields through Wess–Zumino–Witten terms, providing a prime candidate for a di-boson (including a di-photon) resonance. The models also contain colored pNGBs which can be searched for at the LHC.
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Alves, Alexandre, Dorival Gonçalves, Tathagata Ghosh, Huai-Ke Guo, and Kuver Sinha. "Di-Higgs blind spots in gravitational wave signals." Physics Letters B 818 (July 2021): 136377. http://dx.doi.org/10.1016/j.physletb.2021.136377.

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Amin, Sulvahrul, Fatimah Azis, and Febryani Umakamea. "Perilaku Sosial Penggiat Game Higgs Domino Di KotaMakassar (Dalam Tinjauan Post Modern)." PADARINGAN (Jurnal Pendidikan Sosiologi Antropologi) 4, no. 3 (September 1, 2022): 140. http://dx.doi.org/10.20527/pn.v4i3.6247.

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Abstrak: Perilaku Sosial Penggiat Game Higgs Domino Di Kota Makassar terhadap Game Domino, terbilang masih marak dan masih di lakukan oleh masyarakat di Kota Makassar sebagian besar penggiat game kecanduan .penelitian kualitatif dengan pendekatan fenomenologi yang bertujuan untuk mengungkap bagaimana perilaku sosial penggiat game higgs domino di kota Makassar dan bagaimana dampak penggiat game higgs domino . Lokasi penelitian ini berada di kota Makassar. Informan dalam penelitian ini yaitu, Penggiat game, masyarakat makassar, Toko Masyarakat, dan yang tidak bermain game. Teknik pengumpulan datanya menggunakan tiga cara yaitu, Observasi, Wawancara dan Dokumentasi.Hasil Penelitian ini . Memainkan game online dengan cara berlebihan akan mengurangi aktivitas positif yang seharusnya dijalani oleh anak pada usia perkembangan mereka. Motivasi belajar mereka menjadi rendah, waktu untuk bersosialisasi dengan teman sebaya mereka. Bermain game telah menjadi salah satu hiburan paling popular di dunia, jauh mengungguli bentuk-bentuk permainan dan hiburan anak lainnya. Hal ini terjadi karena game menawarkan banyak pilihan, dimana para pemain game diajak untuk menghadapi dilema moral, interaksi sosial, dan memecahkan berbagai masalah yang sering kali terjadi dalam kehidupan nyata, sehingga mereka selalu tertarik pada hal-hal baru. Dalam hal ini, anakanak akan selalu ingin bermain game, dan akhirnya menjadi kecanduan game. Jika seorang remaja menjadi kecanduan bermain game online, sudah dapat dipastikan waktu mereka akan banyak dihabiskan untuk bermain game sehingga waktu untuk melakukan hal-hal lain tidak ada. Hal ini lama kelamaan dapat mempengaruhi kepribadiaan penggiat.
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Gopalakrishna, Shrihari, and Tuhin Subhra Mukherjee. "Gauge-Singlet Vector-Like Fermion Dark Matter, LHC Diphoton Rate, and Direct Detection." Advances in High Energy Physics 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/8689270.

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We study a gauge-singlet vector-like fermion hidden sector dark matter model, in which the communication between the dark matter and the visible standard model sector is via the Higgs-portal scalar-Higgs mixing and also via a hidden sector scalar with loop-level couplings to two gluons and also to two hypercharge gauge bosons induced by a vector-like quark. We find that the Higgs-portal possibility is stringently constrained to be small by the recent LHC di-Higgs search limits, and the loop induced couplings are important to include. In the model parameter space, we present the dark matter relic density, the dark-matter-nucleon direct detection scattering cross section, the LHC diphoton rate from gluon-gluon fusion, and the theoretical upper bounds on the fermion-scalar couplings from perturbative unitarity.
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Pierce, Aaron, Jesse Thaler, and Lian-Tao Wang. "Disentangling dimension six operators through di-Higgs boson production." Journal of High Energy Physics 2007, no. 05 (May 21, 2007): 070. http://dx.doi.org/10.1088/1126-6708/2007/05/070.

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Englert, Christoph, Frank Krauss, Michael Spannowsky, and Jennifer M. Thompson. "Di-Higgs phenomenology in tt¯hh: The forgotten channel." Physics Letters B 743 (April 2015): 93–97. http://dx.doi.org/10.1016/j.physletb.2015.02.041.

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Dissertations / Theses on the topic "Di-Higgs"

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Giovannini, Elena. "Rottura spontanea di simmetria nel meccanismo di Higgs." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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Il meccanismo di Higgs è il meccanismo teorico che conferisce massa ai bosoni di gauge deboli. La rottura spontanea di simmetria del campo di Higgs è l'elemento cardine del meccanismo. L'elaborato si sviluppa introducendo inizialmente i principali concetti di meccanica Lagrangiana e teoria dei gruppi. Dopo aver gettato le basi, nel secondo capitolo è presentata un'analisi generale del concetto di teoria di gauge e delle sue implicazioni distinguendo il caso abeliano da quello non abeliano. A seguire sono illustrate le principali proprietà dell'interazione debole e viene messo in luce come la massività dei suoi mediatori non permetta la trattazione dell'interazione come teoria di gauge. Infine, nel terzo capitolo, viene illustrata prima, in generale, la rottura spontanea di simmetria e poi, finalmente, come grazie ad essa sia possibile eliminare il problema relativo ai bosoni deboli.
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Brännström, Hanna. "Di-Higgs Production in the Standard Model and Beyond." Thesis, Stockholms universitet, Fysikum, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-194419.

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This thesis examines how the kinetic properties of pair-produced Higgs bosons depend on whether the process is mediated by particles in the Standard Model or a simplified supersymmetric model. The analysis is based on simulated data made using MadGraph. The examination within this thesis is split into two parts, one performed on the output of MadGraph (parton level) and the second performed on the output of a simplified simulation of the ATLAS detector response (reconstruction level). The first part also contains a section showing that the supersymmetric model results are consistent with the Standard Model results in cases where no supersymmetric particles are present in the di-Higgs production and decay, and a section detailing the minor differences in kinematics of the Higgs bosons depending on the mass of the supersymmetric partner of the top quark. The second part of the thesis covers the decay of the Higgs boson into bottom and anti-bottom quarks, and includes a section showing that there is no difference if the decay is done using the MadSpin module or the Pythia module for MadGraph, before exploring the kinematics of the jets produced. Both when studying Higgs bosons at the parton level and when studying b-jets at the reconstruction level, it is found that there are clear differences in the kinematics between the Standard Model and the supersymmetric model. At both levels, a neural network has been designed, trained and tested. For the parton level neural network 59 % of all events are classified correctly, while at the reconstruction level 51 % of all events are classified correctly. These neural network results show that it is possible to train a neural network to learn on data like this, and that with enough di-Higgs events detected, their kinematic properties could be used to indirectly infer the presence of physics beyond the Standard Model.
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Stevenson, Thomas James. "Search for di-Higgs production to the b¯bτ +τ − final state using Support Vector Machines with the ATLAS detector at the Large Hadron Collider in pp collisions at √s = 13TeV." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/42543.

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This thesis presents a search for resonant and standard model non-resonant di-Higgs production in theb¯bτ +τ− decay channel, with the semi-leptonic ditau state. The search uses data collected by the ATLAS experiment at the LHC of pp-collisions at √s=13 TeV during 2015 and 2016, corresponding to an instantaneous luminosity of 36:1fb-1. No deviation from the Standard Model prediction is observed. For the non-resonant standard model di-Higgs production an upper limit is set on the cross-section compared to the Standard Model prediction,σ/σSM< 24:44 @ 95%CL. Upper limits are set on the cross-section times branching ratio for the resonant searches, where the results are interpreted in terms of constraints on a 2HDM heavy scalar Higgs model and a Randall-Sundrum Kaluza-Klein graviton model. The use of Support Vector Machines is investigated and benchmarked against the nominal results of the Boosted Decision Tree multivariate analysis, in pursuit of potential future improvements.
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Vaheid, Halimeh. "Generation and Validation of di-Higgs events in the 4τ final state." Thesis, Uppsala universitet, Högenergifysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355744.

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The Higgs self-coupling has a vital role by giving a deeper understanding of the Higgs particle. Furthermore, the way it opens to physics beyond the SM, encourages us to do MC simulationstudies for varying λ_hhh . In this project, we investigate the effects of choosing different values for λ_hhh on the kinematics of all particles involved in the hh → τ τ τ τ decay channel and the resultsare compared with what we get from the SM prediction of λ_hhh .The data show that λ_hhh more close to the SM trilinear Higgs self-coupling results in generatingthe Higgs particles with the higher masses and higher momenta. On the other hand, for the moremassive Higgs bosons we have more energetic neutrinos in the final states which escape from thedetector without being detected.
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Leney, Katharine J. C. "Searches for Higgs bosons in the di-tau decay channels at the ATLAS experiment." Thesis, University of Liverpool, 2010. http://livrepository.liverpool.ac.uk/1459/.

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The search for the Higgs boson will be one of the primary tasks of the LHC. One of the most promising channels in the search for a low mass Higgs boson will be the scenario where the Higgs is produced via Vector Boson Fusion and subsequently decays to a pair of tau leptons. One of the dominant (and most complex) backgrounds to this analysis is expected to come from tt decays. Monte Carlo samples with a centre-of-mass energy of 14 TeV are used to investigate the contributions from different tt decay modes and to develop methods to reduce the contribution from this background process and improve the overall sensitivity of the analysis. A technique to estimate contributions from background processes when there are insufficient Monte Carlo samples available to calculate this directly is also presented. A low mass Standard Model Higgs boson will require at least 10 inverse femtobarns of data before a discovery (or exclusion) can be claimed, but extensions to the Standard Model that realise Supersymmetry predict that there should be three neutral Higgs bosons. The production cross-section is strongly enhanced and it is there- fore expected that competitive limits on an MSSM Higgs boson can be made using data from the 2010-2011 LHC data-taking period (1 inverse femtobarn expected with 7 TeV centre-of-mass collisions). A search strategy for an MSSM Higgs boson decaying to two taus is presented, focusing on ensuring analysis robustness during this early period. Comparisons with the first ATLAS data are also made.
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Fontanesi, Elisa. "Studio di produzione associata dei bosoni Higgs e Z in interazioni protone-protone a LHC." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7833/.

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Uno dei cardini nel programma di ricerca attuale del Large Hadron Collider (LHC) al CERN è l’approfondimento della conoscenza relativa al bosone di Higgs e agli accoppiamenti di questa particella, di recente scoperta, con le altre del Modello Standard. Il prossimo Run di LHC sarà caratterizzato da collisioni di fasci di protoni con un'energia di 6.5 TeV ciascuno e renderà possibile l’acquisizione di grandi campioni di dati nei quali si prevede un aumento della statistica per tipologie di eventi che fino a questo momento è stato problematico studiare. Tra questi la produzione per Higgs-strahlung del bosone di Higgs associato al bosone vettore Z, che, essendo caratterizzata da una bassa sezione d’urto, è sempre stata considerata un processo molto difficile da investigare. Questa tesi fornisce uno studio preliminare della fattibilità di recuperare in modo efficiente questo canale, con l’obiettivo di individuare alcuni tagli che permettano di ripulire il grande fondo adronico prodotto nelle collisioni protone-protone a LHC. La presente analisi è stata effettuata su campioni di dati ottenuti tramite una generazione Monte Carlo e una simulazione parametrica del rivelatore ATLAS. Sebbene la statistica dei campioni MC sia ancora limitata e la simulazione della risposta del detector non sia dettagliata, le tecniche e i tagli utilizzati in questo lavoro di tesi potranno dare utili indicazioni per futuri studi più dettagliati e per l'investigazione di questo processo una volta che i dati del prossimo Run di LHC a √s=13 TeV saranno disponibili.
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Anders, Christoph [Verfasser]. "Search for MSSM Higgs Bosons in Di-tau Final States with the ATLAS Experiment / Christoph Anders." Bonn : Universitäts- und Landesbibliothek Bonn, 2013. http://d-nb.info/1044870206/34.

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Dall'Osso, Martino. "Production of the new pixel detector for the upgrade of the CMS experiment and study of anomalous couplings in the non-resonant Higgs bosons pair production in p-p collisions at sqrt(s) = 13 TeV." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424460.

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The present thesis work has been carried out in the framework of the CMS collaboration, one of the experiment designed to study the physics of the proton-proton collisions at the Large Hadron Collider (LHC) at CERN. Experimentation at CMS (and at ATLAS) led to the discovery of a new particle in 2012 which has been identified as the Higgs boson, the missing brick of the Standard Model of the fundamental interactions. All the experiments at LHC are upgrading their detectors in order to fulfill the continuous increment of the LHC luminosity and the consequent increment of the per collision event rate. The CMS upgrade project foresees, inter alia, the production of a new pixel detector (CMS Phase 1 Pixel Upgrade) to be commissioned at the beginning of 2017. Crucial part of the upgrade is the new readout chip (ROC) for the silicon sensor, psi46digV2respin, designed at the Paul Scherrer Institute (PSI) with a 250 nm CMOS technology. This chip represents the state of the art in the readout electronics for the silicon detectors. The thesis concerns the study and the development of test procedures for this new readout chip. Thanks to a long stay at PSI, I could provide an important contribution to the debug phases of the first version of the ROC and TBM, the chip that handles the various ROCs in the pixel module, and to the development of the software used by the whole collaboration for the ROC and module testing. This experience allowed me to be the expert for the installation and commissioning of the ROC readout system in all the production centres in Italy. Furthermore, I managed the ROC wafers test from the early project phases. The ROCs are produced on silicon wafers and undergo various processes before being assembled on the modules, e.g., metal deposition on the pixel pads, thinning and dicing. These processes lead mechanical and thermal stresses that can damage the chips. The ROC wafers test has thus been performed following the same procedure before and after the processing. In order to minimize the failing ROCs fraction mounted on the modules. It has been measured that the processing introduces a 5.2 % reduction of the number of perfectly working ROCs. The pixel detector production line, the module qualification process and the ROC wafers test results are reported in this thesis. The modifications performed on the ROC-sensor connection technology are also described. The new pixel detector installation will allow an increase of the tracks reconstruction efficiency and a 10-15 um resolution to be maintained in the interaction vertices reconstruction, independently from the increment of the mean number of events per p-p interaction from the current 15 to 50-60 in 2017. The excellent performances of the new pixel vertex detector plus the planned increment of the luminosity (a factor 35 between 2017 and the current value) could allow access to physical processes with a low cross section and a high number of b quarks in the final states. For this purpose, a preliminary study on the non-resonant Higgs bosons pair production in the fully hadronic decay channel bbbb is here presented. The study has been performed analysing the data collected by the CMS experiment in 2015, equal to 2.19 fb-1. This process has a low cross section, accordingly to the SM, and its measurement in p-p collision at centre of mass energies of 13-14 TeV is forecast only with a high amount of data (ab-1). The data collected in 2015 do not allow to set a reasonable exclusion limit on the cross section of this process and the analysis will be completely developed in 2016 and following years. The study of the Higgs bosons pair production is relevant because the pairs can be produced also after couplings which are not allowed by the Standard Model (anomalous), such as the higgs-gloun contact interaction. These anomalous couplings lead to an increment of the cross section of the process and to differences in the kinematics of the final states. The process of Higgs bosons pair production via anomalous couplings is described by a Lagrangian with five free parameters. This implies a difficulty in the identification of parameters space point to be experimentally investigated. I developed an analysis technique which allows, by studying simulated samples, to divide the parameters space in kinematically similar regions and to identify a benchmark in each of them. The distance among different points of the parameters space has been defined through a binned likelihood ratio and an iterative algorithm has been developed to group them together. Twelve regions which are kinematically equivalent have been identified in a 5-D space. The results of this study, described in this thesis, are collected in an article which is under publication on JHEP and they will be considered as guideline for the searches of non-resonant Higgs bosons pair production at CMS.
Questo lavoro di tesi è stato svolto nell'ambito della collaborazione CMS, uno degli esperimenti progettati per studiare la fisica delle collisioni protone-protone al Large Hadron Collider (LHC) presso il CERN. La sperimentazione a CMS (ed a ATLAS) ha portato nel 2012 alla scoperta di una nuova particella che è stata in seguito identificata come il bosone di Higgs, l'ultimo tassello mancante dello Standard Model delle interazioni fondamentali. Tutti gli esperimenti a LHC sono in una fase di miglioramento degli apparati in vista del continuo aumento di luminosità di LHC e del conseguente aumento del rate di eventi per collisione. Il progetto di upgrade di CMS prevede tra l'altro la produzione di un nuovo rivelatore a pixel (CMS Phase 1 Pixel Upgrade) da inserire nell'apparato all'inizio del 2017. Parte cruciale dell'upgrade è il nuovo chip di lettura (ROC) dei sensori al silicio, psi46digV2respin, disegnato al Paul Scherrer Institute (PSI) in tecnologia CMOS 250 nm. Tale chip rappresenta lo stato dell'arte nell'elettronica di lettura di rivelatori al silicio. La tesi riguarda lo studio e lo sviluppo di procedure di test di questo nuovo chip di lettura. Grazie ad una lunga permanenza al PSI ho potuto fornire un importante contributo alle fasi di debug delle prime versioni del ROC e del TBM, il chip che gestisce i diversi ROCs all'interno di un pixel module, ed allo sviluppo del software utilizzato da tutta la collaborazione per il test del ROC e dei moduli. Questa esperienza mi ha permesso essere l'esperto per l'installazione e messa a punto dei sistemi di lettura dei ROC nei centri di produzione di moduli in Italia. Inoltre ho gestito il test dei ROC wafers fin dalle prime fasi di sviluppo del progetto. I ROC sono prodotti su wafers di silicio e subiscono diversi processi di lavorazione prima dell'assemblaggio sui moduli, e.g., la deposizione di metalli sulle pixel pads, l'assottigliamento ed il taglio. Queste lavorazioni comportano stress meccanici e termici che possono danneggiare i chips. Il test dei ROC wafers è stato quindi effettuato, con la stessa procedura, prima e dopo la lavorazione per ridurre al minimo la frazione di ROCs non funzionanti montati sui moduli. Si è misurato che la lavorazione dei wafers introduce una riduzione del 5.2 % del numero di ROCs perfettamente funzionanti. Nella tesi sono riportati la catena di produzione del rivelatore a pixel, il processo di qualifica dei moduli ed il dettaglio dei test su ROC wafers. Vengono inoltre descritte le modifiche apportate alla tecnologia utilizzata per la connessione ROC-sensore. L'installazione del nuovo rivelatore a pixel permetterà di aumentare l'efficienza di ricostruzione delle tracce e di mantenere una risoluzione di 10-15 um nella ricostruzione dei vertici d'interazione anche all'aumentare del numero medio di eventi per interazione p-p dagli attuali 15 a 50-60 nel 2017. Le ottime prestazioni del nuovo rivelatore di vertice a pixel sommate al previsto aumento di luminosità (un fattore 35 tra il valore attuale e quello previsto per il 2017) potranno dare accesso a processi fisici con bassa sezione d'urto ed alto numero di b quarks negli stati finali. Viene a tal fine presentato uno studio preliminare della produzione non risonante di coppie di bosoni di Higgs nel canale di decadimento completamente adronico (bbbb) analizzando i dati raccolti dall'esperimento CMS nel 2015, pari a 2.19 fb-1. Questo processo presenta una ridotta sezione d'urto, secondo il Modello Standard, e la sua misura in collisioni p-p ad energie del centro di massa di 13-14 TeV è prevista solo con un'elevata quantità di dati (ab-1). I dati raccolti nel 2015 non permettono di ottenere un limite ragionevole sulla sezione d'urto di produzione di tale processo e l'analisi verrà sviluppata pienamente nel 2016 e nei successivi anni. Lo studio della produzione di coppie di bosoni di Higgs è rilevante poiché esse possono essere prodotte anche in seguito ad accoppiamenti non previsti dal Modello Standard (anomali), come l'interazione di contatto tra bosoni di Higgs e gluoni. Tali accoppiamenti anomali danno luogo ad un incremento della sezione d'urto del processo e ad una differente cinematica degli stati finali. Il processo di produzione di coppie di bosoni di Higgs per mezzo di accoppiamenti anomali è descritto da una Lagrangiana con cinque parametri liberi. Questo comporta una difficoltà nell'individuare i punti dello spazio dei parametri da indagare sperimentalmente. Ho sviluppato una tecnica di analisi che permette, attraverso lo studio di campioni simulati, di suddividere tale spazio in regioni cinematicamente simili ed identificare per ognuna di esse il punto maggiormente significativo. La distanza tra i diversi punti dello spazio dei parametri è stata definita tramite un ”binned likelihood ratio” ed un algoritmo iterativo è stato sviluppato per raggruppare tali punti. Sono state quindi individuate dodici regioni cinematicamente simili in uno spazio 5-D. I risultati di tale studio, descritti in questa tesi, sono raccolti in un articolo in fase di pubblicazione su JHEP e verranno considerati come linee guida per le ricerche di produzione non risonante di coppie di bosoni di Higgs a CMS.
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Fedotova, Veronika. "Teorie di gauge e rottura spontanea di simmetria." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16767/.

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In questa tesi si discutono le teorie di gauge abeliane e non abeliane. Partendo da una base di teoria generale, si prendono come esempi di applicazione l'Elettrodinamica quantistica, dove il gruppo di gauge è il gruppo abeliano U(1) - teoria di gauge abeliana, e la Cromodinamica quantistica, dove il gruppo di gauge è il gruppo non abeliano SU(3) - teoria di gauge non abeliana. Si mostra come il concetto chiave di simmetria di gauge e l'uso cruciale della derivata covariante permetta di ottenere facilmente le Lagrangiane classiche delle suddette teorie. Per ultimo si affronta il problema di come introdurre un termine di massa associato ai campi di gauge, analizzando il Meccanismo di Higgs abeliano, in cui per semplicità si fa uso di un campo scalare complesso. Il Modello Standard delle particelle elementari è basato sul gruppo di gauge SU(3) x SU(2) x U(1)$ con meccanismo di Higgs per le interazioni deboli.
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Comandini, Devis. "Prospects for the Higgs boson self-coupling measurement with the Phase-II CMS detector upgrade using simulated pp collisions at √s = 27 TeV (High Energy LHC)." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18478/.

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The performance of the HH->bbZZ (l) (l = e, mu) analysis is presented considering the possible High Energy upgrade of the LHC collider, at a center-of-mass energy of √s = 27 TeV and with an integrated luminosity of 15000 fb^{-1}; a comparison of the results with the same study performed in the context of the High Luminosity LHC, at a center-of-mass energy of √s =14 TeV and with an integrated luminosity of 3000 fb^{-1}, is also reported. The Phase-II upgraded CMS detector, expected in 2024, is assumed in both the scenarios. The analysis is fully based on Monte Carlo simulations: the parton-level generation of signal and backgrounds is performed with MADGRAPH5_AMC@NLO, while parton showering and hadronization are achieved with PYTHIA8; the detector response is then obtained in the parametric framework provided by DELPHES. A limit on the di-Higgs signal strength of r =1.45 is estimated at 95% CL in the inclusive bb4l channel, with a corresponding signal significance of 1.43 σ. A study on the prospects for the measurements of the Higgs self-coupling (λ_3) is also performed: the projected confidence interval on k_λ = λ_3/λ_3^{SM} is found to be [-0.7,7.2] at the 95% CL.
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Books on the topic "Di-Higgs"

1

Casalbuoni, R. La ricerca del bosone di Higgs. Firenze, Italy: Firenze University Press, 2013.

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Magliocco, Paolo. La grande caccia: Storia della scoperta del bosone di Higgs. Milano: Pearson, 2013.

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Lamberti, Corrado. Il bosone di Higgs: Il trionfo del modello standard o l'alba di una nuova fisica? Reggio Emilia: Aliberti editore, 2012.

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Storia della rottura di simmetria: Dalla colonna di Eulero al Bosone di Higgs, il lungo cammino di un'idea. Roma: Aracne editrice S.r.l., 2012.

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Maiani, L. A caccia del bosone di Higgs: Magneti, governi, scienziati e particelle nell'impresa scientifica del secolo. [Milan]: Mondadori università, 2013.

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Search for a new resonance in the boosted di-Higgs to 4 bottom quarks final state at √s = 8 TeV using the ATLAS detector at the Large Hadron Collider. [New York, N.Y.?]: [publisher not identified], 2015.

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Accenti, Eva, and Ettore Accenti. Meccanica Quantistica 1: Dal Quanto Di Planck Al Bosone Di Higgs. Independently Published, 2019.

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Terzo millennio. Dal bosone di Higgs al villaggio virtuale. L'Aquila, Italy: Scuola Superiore Guglielmo Reiss Romoli, 1997.

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La particella alla fine dell'universo: La caccia al bosone di Higgs e le nuove frontiere della fisica. Codice Edizioni, 2013.

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Manzoni, Stefano. Physics with Photons Using the ATLAS Run 2 Data: Calibration and Identification, Measurement of the Higgs Boson Mass and Search for Supersymmetry in Di-Photon Final State. Springer, 2019.

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Book chapters on the topic "Di-Higgs"

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Verzegnassi, Claudio. "La luce della Conoscenza: da Prometeo al bosone di Higgs." In Il senso ritrovato, 11–22. Milano: Springer Milan, 2013. http://dx.doi.org/10.1007/978-88-470-2832-6_2.

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Curceanu, Catalina Oana. "Il bosone di Higgs: il tassello mancante del Modello Standard." In Dai buchi neri all’adroterapia, 233–38. Milano: Springer Milan, 2013. http://dx.doi.org/10.1007/978-88-470-5241-3_30.

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Shah, Aashaq, Ashok Kumar, and Mario Pelliccioni. "Search for Heavy Neutral Higgs in Di-Boson Final State at $$\sqrt{s}$$ = 13 TeV." In XXII DAE High Energy Physics Symposium, 905–7. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_221.

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Dewanjee, Ram Krishna. "Search for Model Independent Di-Higgs Production in the bb$$\tau _{h}\tau _{h}$$ channel at CMS." In XXII DAE High Energy Physics Symposium, 525–28. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_123.

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Mondal, Kuntal. "Measurements of Higgs Boson Production and Properties in Di-photon Decay Channel Using Data Collected by CMS Detector at Center of Mass Energy of 13 TeV." In XXII DAE High Energy Physics Symposium, 201–4. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_45.

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Conference papers on the topic "Di-Higgs"

1

Saggio, Alessia. "Search for resonant di-Higgs production at CMS." In 40th International Conference on High Energy physics. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.390.0079.

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Varol, Tulin. "Search for di-Higgs production with the ATLAS detector." In 38th International Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.282.0405.

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Davey, Will. "Search for di-Higgs production with the ATLAS detector." In The European Physical Society Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2017. http://dx.doi.org/10.22323/1.314.0272.

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Mete, Tulin. "Prospects for Single- and Di-Higgs Measurements at the HL-LHC with ATLAS." In 41st International Conference on High Energy physics. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.414.0533.

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Boukidi, Mohammed, Rachid Benbrik, Stefano Moretti, and Souad Semlali. "Probing a 96 GeV Higgs Boson in the Di-Photon Channel at the LHC." In 41st International Conference on High Energy physics. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.414.0547.

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Totaro, Pierluigi. "Search for Standard Model Higgs boson in di-tau final state at the Tevatron." In 35th International Conference of High Energy Physics. Trieste, Italy: Sissa Medialab, 2011. http://dx.doi.org/10.22323/1.120.0080.

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Costanza, Francesco. "Search for di-Higgs production at 13 TeV and prospects for the HL-LHC." In European Physical Society Conference on High Energy Physics. Trieste, Italy: Sissa Medialab, 2020. http://dx.doi.org/10.22323/1.364.0336.

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DEN DUNNEN, Wilco. "Determining the Higgs spin and parity in the di-photon decay channel using gluon polarization." In XXI International Workshop on Deep-Inelastic Scattering and Related Subjects. Trieste, Italy: Sissa Medialab, 2013. http://dx.doi.org/10.22323/1.191.0242.

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Spanring, Markus. "Search for additional neutral MSSM Higgs bosons in the di-tau final state at CMS." In An Alpine LHC Physics Summit. Trieste, Italy: Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.330.0054.

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D'Amante, Valeria. "Search for resonant and nonresonant di-Higgs boson production at CMS using jet substructure techniques." In 41st International Conference on High Energy physics. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.414.0504.

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Reports on the topic "Di-Higgs"

1

Dixon, Lance. The Di-Photon Background to a Light Higgs Boson at the LHC. Office of Scientific and Technical Information (OSTI), November 2002. http://dx.doi.org/10.2172/808705.

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Dixon, Lance. Resonance-continuum interference in the di-photon Higgs signal at the LHC. Office of Scientific and Technical Information (OSTI), February 2003. http://dx.doi.org/10.2172/812641.

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Dixon, Lance. Isolating a Light Higgs Boson From the Di-Photon Background at the LHC. Office of Scientific and Technical Information (OSTI), June 2002. http://dx.doi.org/10.2172/799077.

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Prasad, Vindhyawasini. Search for Di-Muon Decays of a Light Scalar Higgs Boson in Radiative Upsilon(1S) Decays. Office of Scientific and Technical Information (OSTI), August 2013. http://dx.doi.org/10.2172/1082787.

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Connolly, Amy Lynn. A Search for Supersymmetric Higgs Bosons in the Di-tau Decay Mode in Proton - Anti-proton Collisions at 1.8 TeV. Office of Scientific and Technical Information (OSTI), January 2003. http://dx.doi.org/10.2172/15017134.

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