Study of b- and c- jets identification for Higgs coupling measurement at muon collider

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Studio dell'universalità leptonica nei decadimenti semileptonici del B

Tramite uno studio bibliografico, si verifica la validità dell'universalità leptonica prevista dal modello standard. Si presenta un breve excursus dei risultati nel campo dei decadimenti di W,Z, leptonici di tau e muone e leptonici di mesoni leggeri per poi passare all'ambito che presenta maggiori anomalie: i decadimenti semileptonici del B. Si discuterà dell'anomalia presente in b->sl-l+ e successivamente del rapporto RD nelle transizioni semileptoniche dal quark b al c. In quest'ultimo contesto, dai risultati delle B factory, si trarrà una misura originale confrontando i decadimenti nell'elettrone rispetto a quelli nel muone. Il rapporto risulterà compatibile con l'unità, verificando in questo ambito l'universalità leptonica dei leptoni leggeri.ope

Towards a Muon Collider

A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work.Comment: 118 pages, 103 figure

Towards a muon collider

A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work

Identifying associations between diabetes and acute respiratory distress syndrome in patients with acute hypoxemic respiratory failure: an analysis of the LUNG SAFE database

Background: Diabetes mellitus is a common co-existing disease in the critically ill. Diabetes mellitus may reduce the risk of acute respiratory distress syndrome (ARDS), but data from previous studies are conflicting. The objective of this study was to evaluate associations between pre-existing diabetes mellitus and ARDS in critically ill patients with acute hypoxemic respiratory failure (AHRF). Methods: An ancillary analysis of a global, multi-centre prospective observational study (LUNG SAFE) was undertaken. LUNG SAFE evaluated all patients admitted to an intensive care unit (ICU) over a 4-week period, that required mechanical ventilation and met AHRF criteria. Patients who had their AHRF fully explained by cardiac failure were excluded. Important clinical characteristics were included in a stepwise selection approach (forward and backward selection combined with a significance level of 0.05) to identify a set of independent variables associated with having ARDS at any time, developing ARDS (defined as ARDS occurring after day 2 from meeting AHRF criteria) and with hospital mortality. Furthermore, propensity score analysis was undertaken to account for the differences in baseline characteristics between patients with and without diabetes mellitus, and the association between diabetes mellitus and outcomes of interest was assessed on matched samples. Results: Of the 4107 patients with AHRF included in this study, 3022 (73.6%) patients fulfilled ARDS criteria at admission or developed ARDS during their ICU stay. Diabetes mellitus was a pre-existing co-morbidity in 913 patients (22.2% of patients with AHRF). In multivariable analysis, there was no association between diabetes mellitus and having ARDS (OR 0.93 (0.78-1.11); p = 0.39), developing ARDS late (OR 0.79 (0.54-1.15); p = 0.22), or hospital mortality in patients with ARDS (1.15 (0.93-1.42); p = 0.19). In a matched sample of patients, there was no association between diabetes mellitus and outcomes of interest. Conclusions: In a large, global observational study of patients with AHRF, no association was found between diabetes mellitus and having ARDS, developing ARDS, or outcomes from ARDS. Trial registration: NCT02010073. Registered on 12 December 2013

Towards a muon collider

A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work

Erratum: Towards a muon collider

The original online version of this article was revised: The additional reference [139] has been added. Tao Han’s ORICD ID has been incorrectly assigned to Chengcheng Han and Chengcheng Han’s ORCID ID to Tao Han. Yang Ma’s ORCID ID has been incorrectly assigned to Lianliang Ma, and Lianliang Ma’s ORCID ID to Yang Ma. The original article has been corrected

Study of b- and c- jets identification for Higgs coupling measurement at muon collider

The Muon Collider is a possible option for the next generation of high-energy collider machines. It would permit to achieve very high center-of-mass energy using leptons without occurring in significative synchrotron radiation losses as in positron-electron rings. Due to the muon decay, the detector has to sustain a high level of background: beam decay products and subsequent particles from secondary interactions with the machine elements can reach the interaction point,thus jeopardizing the physical performance of the detector. Nevertheless, this machine offers the possibility of producing huge Higgs boson samples with respect to the backgrounds, allowing the precise determination of the b- and c-quark couplings. In this contribution, a study of the identification of b- and c-jets in the Muon Collider environment is presented, and an estimation of the statistical precision on the H→$b\bar{b}$ cross-section is evaluated, accounting for the presence of the beam and the physical backgrounds. A preliminary study on the use of machine learning techniques to improve the result and to study the H→$c\bar{c}$ will also be reported

Studio dell'universalità leptonica nei decadimenti semileptonici del B

Tramite uno studio bibliografico, si verifica la validità dell'universalità leptonica prevista dal modello standard. Si presenta un breve excursus dei risultati nel campo dei decadimenti di W,Z, leptonici di tau e muone e leptonici di mesoni leggeri per poi passare all'ambito che presenta maggiori anomalie: i decadimenti semileptonici del B. Si discuterà dell'anomalia presente in b->sl-l+ e successivamente del rapporto RD nelle transizioni semileptoniche dal quark b al c. In quest'ultimo contesto, dai risultati delle B factory, si trarrà una misura originale confrontando i decadimenti nell'elettrone rispetto a quelli nel muone. Il rapporto risulterà compatibile con l'unità, verificando in questo ambito l'universalità leptonica dei leptoni leggeri