Search

Journal of high energy physics 11, 036 (2020). doi:10.1007/JHEP11(2020)036, The hadroproduction of a Higgs boson in association with a bottom-quark pair ($H b \bar b$) is commonly considered as the key process for directly probing the Yukawa interaction between the Higgs boson and the bottom quark ($y_b$). However, in the Standard-Model (SM) this process is also known to suffer from very large irreducible backgrounds from other Higgs production channels, notably gluon-fusion ($gg$F). In this paper we calculate for the first time the so-called QCD and electroweak complete-NLO predictions for $H b \bar b$ production, using the four-flavour scheme. Our calculation shows that not only the $gg$F but also the $ZH$ and even the vector-boson-fusion channels are sizeable irreducible backgrounds. Moreover, we demonstrate that, at the LHC, the rate of these backgrounds is very large with respect to $H b \bar b$ production and in particular no suppression occurs at the differential level. Therefore, they survive typical analysis cuts. This fact further jeopardises the experimental measurement of SM $H b \bar b$ production at the LHC. Especially, unless the $y_b$ is significantly enlarged by new physics, even for beyond-the SM scenarios the direct determination of $y_b$ via this process seems to be hopeless at the LHC., Published by SISSA, [Trieste]

Le novità legislative sollevano molteplici aspetti di interesse per le strutture sanitarie la cui attività deve considerarsi particolarmente esposta ai rischi derivanti dalla possibile diffusione del virus Covid-19. Ciò riguarda sia i singoli operatori sanitari e i vertici gestionali, che potrebbero essere destinatari di contestazioni sul piano penale, sia gli enti di assistenza sanitaria, tenuti ad adattare la propria organizzazione interna con la previsione di specifiche misure per il contrasto e la prevenzione del contagio.

We study the sensitivity to the shape of the Higgs potential of single, double, and triple Higgs production at future $e^+e^-$ colliders. Physics beyond the Standard Model is parameterised through the inclusion of higher-dimensional operators $(\Phi^\dagger \Phi- v^2/2)^n/\Lambda^{(2n-4)}$ with $n=3,4$, which allows a consistent treatment of independent deviations of the cubic and quartic self couplings beyond the tree level. We calculate the effects induced by a modified potential up to one loop in single and double Higgs production and at the tree level in triple Higgs production, for both $Z$ boson associated and $W$ boson fusion production mechanisms. We consider two different scenarios. First, the dimension six operator provides the dominant contribution (as expected, for instance, in a linear effective-field-theory(EFT)); we find in this case that the corresponding Wilson coefficient can be determined at $\mathcal{O}(10\%)$ accuracy by just combining accurate measurements of single Higgs cross sections at $\sqrt{\hat s}=$240-250 GeV and double Higgs production in $W$ boson fusion at higher energies. Second, both operators of dimension six and eight can give effects of similar order, i.e., independent quartic self coupling deviations are present. Constraints on Wilson coefficients can be best tested by combining measurements from single, double and triple Higgs production. Given that the sensitivity of single Higgs production to the dimension eight operator is presently unknown, we consider double and triple Higgs production and show that combining their information colliders at higher energies will provide first coarse constraints on the corresponding Wilson coefficient., Comment: minor changes, version accepted for publication in JHEP

We study one-loop effects induced by an anomalous Higgs trilinear coupling on total and differential rates for the $H\to 4\ell$ decay and some of the main single-Higgs production channels at the LHC, namely, VBF, $VH$, $t\bar tH$ and $tHj$. Our results are based on a public code that calculates these effects by simply reweighting samples of Standard-Model-like events for a given production channel. For $VH$ and $t\bar tH$ production, where differential effects are particularly relevant, we include Standard Model electroweak corrections, which have similar sizes but different kinematic dependences. Finally, we study the sensitivity of future LHC runs to determine the trilinear coupling via inclusive and differential measurements, considering also the case where the Higgs couplings to vector bosons and the top quark is affected by new physics. We find that the constraints on the couplings and the relevance of differential distributions critically depend on the expected experimental and theoretical uncertainties., Comment: 31 pages, 15 figures, 5 tables; Matches the journal version

L’ottenimento di un vantaggio economico non può automaticamente tradursi nella partecipazione concorsuale al reato che lo ha generato: a tal fine, è necessario accertare l’efficienza causale del contributo (materiale o morale) del beneficiario alla realizzazione del fatto di reato. Tale regola generale trova riscontro nella giurisprudenza delle Sezioni Unite in cui si evidenzia come, sul piano dell’accertamento probatorio, l’ottenimento di un vantaggio economico possa al più costituire un indizio della partecipazione concorsuale al reato, dovendo quindi essere valutato alla luce di quanto stabilito all’art. 192, co. 2, c.p.p. Il doveroso rispetto di tali regole sostanziali e processuali può consentire, a determinate condizioni, di escludere la partecipazione concorsuale del beneficiario economico negli esaminati casi di abuso d’ufficio, omessa dichiarazione e bancarotta preferenziale.

La recente giurisprudenza di legittimità, riprendendo il principio di diritto affermato dalle Sezioni Unite, nega la legittimazione del curatore fallimentare ad impugnare il provvedimento di sequestro. L’Autore sottopone tale orientamento ad un’analisi critica e, attraverso un esame del ruolo del curatore, giunge ad una diversa soluzione supportata da una certa giurisprudenza che sembra discostarsene.