Precision from the diphoton Zh channel at FCC-hh

The future 100 TeV FCC-hh hadron collider will give access to rare but clean final states which are out of reach of the HL-LHC. One such process is the Zh production channel in the $$ \left(v\overline{v}/{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-}\right)\gamma \gamma $$ v v ¯ / ℓ + ℓ − γγ final states. We study the sensitivity of this channel to the $$ {\mathcal{O}}_{\varphi q}^{(1)},\kern0.5em {\mathcal{O}}_{\varphi q}^{(3)},\kern0.5em {\mathcal{O}}_{\varphi u} $$ O φq 1 , O φq 3 , O φu , and $$ {\mathcal{O}}_{\varphi d} $$ O φd SMEFT operators, which parametrize deviations of the W and Z couplings to quarks, or, equivalently, anomalous trilinear gauge couplings (aTGC). While our analysis shows that good sensitivity is only achievable for $$ {\mathcal{O}}_{\varphi q}^{(3)} $$ O φq 3 , we demonstrate that binning in the Zh rapidity has the potential to improve the reach on $$ {\mathcal{O}}_{\varphi q}^{(1)} $$ O φq 1 . Our estimated bounds are one order of magnitude better than projections at HL-LHC and is better than global fits at future lepton colliders. The sensitivity to $$ {\mathcal{O}}_{\varphi q}^{(3)} $$ O φq 3 is competitive with other channels that could probe the same operator at FCC-hh. Therefore, combining the different diboson channels sizeably improves the bound on $$ {\mathcal{O}}_{\varphi q}^{(3)} $$ O φq 3 , reaching a precision of |δg1z| ≲ × 10−4 on the deviations in the ZWW interactions.

Production of high purity 52gMn from natV targets with α beams at cyclotrons

BackgroundRadioisotope 52g Mn is of special interest for multimodal imaging (PET/MRI) applications and the main production route is based on proton/deuteron beams on Chromium (natural/enriched) targets. Using state-of-art nuclear reaction codes (Talys, Empire and Fluka), we perform a comparative study with the alternative 52g Mn production with the reaction nat V(α,x) 52g Mn. ResultsThis production channel, novel in the context of medical applications, provides a good source of 52g Mn, where very high radionuclidic purity can be maintained up to 3 weeks. Since nat V consists already of 99.75% 51 V , there is no need of enriched target material and the corresponding high-cost implications. The production of the main long-lived contaminants, i:e: 53 Mn and 54 Mn, is considered with care and the integral yields of the reactions are compared with the alternative production routes. Specifically, the production of the 54 Mn contaminant, which could be the most dangerous for clinical applications, turns out to be lower when compared with the natural Chromium target. ConclusionsThis channel turns out competitive with respect to the other considered production routes. The study also reveals poor accuracy of the relevant cross-section data set and indicates that better data and theoretical descriptions are needed for a precise evaluation of nat V(α,x) 52g Mn.

Searching for the Higgsino-Bino sector at the LHC

We study the search for electroweakinos at the 13 TeV LHC in the case of heavy scalar superpartners. We consider both the direct production mode and the one associated with the decay of heavy Higgs bosons, and concentrate on the case of light Higgsinos and Binos. In this case, the direct production searches becomes more challenging than in the light Wino scenario. In the direct production mode, we use the current experimental searches to set the reach for these particles at larger luminosities, and we emphasize the relevance of considering both the neutral gauge boson and the neutral Higgs decay modes of the second and third lightest neutralino. We show the complementarity of these searches with the ones induced by the decay of the heavy Higgs bosons, which are dominated by the associated production of the lightest neutralino with the second and third lightest ones, with the latter decaying into gauge bosons. We show that, depending on the value of tan β, the Higgs boson decay channel remains competitive with the direct production channel up to heavy Higgs boson masses of about 1 TeV. Moreover, this search is not limited by the same kinematic considerations as the ones in the direct production mode and can cover masses up to the kinematic threshold for the decay of the heavier electroweakinos into the lightest neutralino. This decay mode provides also an alternative way of looking for heavy Higgs bosons in this range of masses and hence should be a high priority for future LHC analyses.

Erosion Prediction of Sub-Sea Xmas Tree Based on CFD

Sub-sea vertical Xmas tree is one of the key equipment in the oil industry. Erosion caused by particles in the flow of oil and gas may lead to equipment failure or even interruption of oil exploitation. Therefore, it is important to figure out the characteristics of erosion in vertical Xmas tree. In the present work, the AISI 8630 erosion model and the Forder wall rebound model has been applied to study the erosion of production channel and choke valve in the tree. The maximum and average surface erosion amount are introduced to evaluate the erosion degree. The results show that for the production channel, erosion mainly occurs in the interior of the turning point of the channel and the interior of the downstream wall near the joint, and the most serious eroded area is located at the bottom of the downstream wall of the channel. Comparing the effects of blind pipe length, particle concentration, particle size and flow velocity on the erosion wear of the production channel, it is found that the flow velocity is the main factor affecting erosion. As the velocity of fluid increases, the maximum and the average surface erosion on the inner wall of production channel increase in a steep manner. For the choke valve, as the relative opening increases, the maximum erosion amount decreases sharply. However, compared with the production channel, the wear of the valve channel is much more serious, and more attention should be paid in industrial operations.

NLO QCD+EW predictions for tHj and tZj production at the LHC

In this work we calculate the cross sections for the hadroproduction of a single top quark or antiquark in association with a Higgs (tHj) or Z boson (tZj) at NLO QCD+EW accuracy. In the case of tZj production we consider both the case of the Z boson undecayed and the complete final state tℓ+ℓ−j, including off-shell and non-resonant effects. We perform our calculation in the five-flavour-scheme (5FS), without selecting any specific production channel (s-, t- or tW associated). Moreover, we provide a more realistic estimate of the theory uncertainty by carefully including the differences between the four-flavour-scheme (4FS) and 5FS predictions. The difficulties underlying this procedure in the presence of EW corrections are discussed in detail. We find that NLO EW corrections are in general within the NLO QCD theory uncertainties only if the flavour scheme uncertainty (4FS vs. 5FS) is taken into account. For the case of tℓ+ℓ−j production we also investigate differences between NLO QCD+EW predictions and NLO QCD predictions matched with a parton shower simulation including multiple photon emissions.

The top quark width constrains from the single top quark production channel.

Using model independent and gauge invariant method proposed in previous studies we provide estimations on the top quark width measurement from the single top quark production channel and discuss the results of combining measurements from single and pair top quark production.