Physics at the [Formula: see text] linear collider Moortgat-Pick, G; Baer, H; Battaglia, M ...
The European Physical Journal. C, Particles and Fields,
08/2015, Letnik:
75, Številka:
8
Journal Article, Book Review
Recenzirano
Odprti dostop
A comprehensive review of physics at an Formula: see text linear collider in the energy range of Formula: see text GeV-3 TeV is presented in view of recent and expected LHC results, experiments from ...low-energy as well as astroparticle physics. The report focusses in particular on Higgs-boson, top-quark and electroweak precision physics, but also discusses several models of beyond the standard model physics such as supersymmetry, little Higgs models and extra gauge bosons. The connection to cosmology has been analysed as well.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
A better understanding of the role of psychosocial resources and factors associated with participating in patient support groups appears to be important for the development and implementation of ...cancer survivorship care plans. We therefore investigated the frequency of participation in and satisfaction with patient support groups after completion of a rehabilitation programme and aimed to examine differences in demographic, medical and psychosocial characteristics between group participants and non‐participants. We further aimed to identify predictors of participation in patient support groups. A total of 1281 eligible patients (75.5% participation rate) were recruited on average 11 months post diagnosis and assessed at the beginning (t1), at the end (t2) and 12 months after rehabilitation (t3). Study participants completed self‐report measures assessing support‐group participation and satisfaction, psychosocial distress (anxiety, fear of cancer recurrence, depression), social support, coping, quality of life, pain and treatment‐related characteristics. Sixty‐seven patients (7.6%) participated in a patient self‐help group. Being unemployed, undergoing an increased number of overall treatments, and a higher active emotion‐oriented coping style significantly predicted self‐help group participation; the predictive power of the multivariate logistic regression model was rather weak (Nagelkerke's R2 = 0.07). Our data provide evidence that self‐help group participation in cancer patients may be largely related to other factors than medical or psychosocial distress.
Extrapolating the Standard Model to high scales using the renormalisation group, three possibilities arise, depending on the mass of the Higgs boson: if the Higgs mass is large enough the Higgs ...self-coupling may blow up, entailing some new non-perturbative dynamics; if the Higgs mass is small the effective potential of the Standard Model may reveal an instability; or the Standard Model may survive all the way to the Planck scale for an intermediate range of Higgs masses. This latter case does not necessarily require stability at all times, but includes the possibility of a metastable vacuum which has not yet decayed. We evaluate the relative likelihoods of these possibilities, on the basis of a global fit to the Standard Model made using the Gfitter package. This uses the information about the Higgs mass available directly from Higgs searches at LEP and now the Tevatron, and indirectly from precision electroweak data. We find that the ‘blow-up’ scenario is disfavoured at the 99% confidence level (96% without the Tevatron exclusion), whereas the ‘survival’ and possible ‘metastable’ scenarios remain plausible. A future measurement of the mass of the Higgs boson could reveal the fate of the Standard Model.
We reevaluate the hadronic contribution to the running of the QED fine structure constant
α(
s) at
s=
M
Z
2. We use data from
e
+
e
− annihilation and
τ decays at low energy and at the
q
q
̄
...thresholds, where resonances occur. Using so-called spectral moments and the Operator Product Expansion (OPE), it is shown that a reliable theoretical prediction of the hadronic production rate
R(
s) is available at relatively low energies. Its application improves significantly the precision on the hadronic vacuum polarization contribution. We obtain
Δα
had(
M
Z
2)=(277.8±2.6)×10
−4 yielding
α
−1(
M
Z
2)=128.923±0.036. Inserting this value in a global electroweak fit using current experimental input, we constrain the mass of the Standard Model Higgs boson to be
M
Higgs
=129
+103
−62
GeV
. Analogously, we improve the precision of the hadronic contribution to the anomalous magnetic moment of the muon for which we obtain
a
μ
had=(695.1±7.5)×10
−10.
A quench detection system was developed for protecting and monitoring the superconducting (SC) solenoids for the Muon-to-Electron Conversion Experiment (Mu2e) at Fermilab. The quench system was ...designed for a high level of dependability and long-term continuous operation. It is based on three tiers: Tier-1, FPGA-based Digital Quench Detection (DQD); Tier-2, Analog Quench Detection (AQD); and Tier-3, the quench controls and data management system. The Tier-1 and Tier-2 systems are completely independent and fully redundant. The Tier-3 system is based on National Instruments (NI) cRIO and provides the user interface for quench controls and data management. It is independent from Tiers 1 & 2. The DQD provides both quench detection and quench characterization (monitoring) capability. Both DQD and AQD have built-in high voltage isolation and user programmable gains and attenuations. The DQD and AQD also includes user configured current dependent thresholding and validation times. A 1 st article of the three-tier system was fully implemented on the new Fermilab magnet test stand for the HL-LHC Accelerator Upgrade Project (AUP). It successfully provided quench protection and monitoring (QPM) for a cold superconducting bus test in November 2020. The Mu2e quench detection design has since been implemented for production testing of the AUP magnets. A detailed description of the system along with results from the AUP superconducting bus test will be presented.
A new evaluation of the hadronic vacuum polarization contribution to the muon magnetic moment is presented. We take into account the reanalysis of the low-energy e + e-annihilation cross section into ...hadrons by the CMD-2 Collaboration. The agreement between e + e-and \(\tau\) spectral functions in the \(\pi\pi\) channel is found to be much improved. Nevertheless, significant discrepancies remain in the center-of-mass energy range between 0.85 and \(1.0\;{\rm GeV}\), so that we refrain from averaging the two data sets. The values found for the lowest-order hadronic vacuum polarization contributions are \ a_\mu^{\rm had,LO} = \left\{\begin{array}{@{}ll@{}}(696.3\pm6.2_{\exp}\pm3.6_{\mathrm{rad}})\,10^{-10} & \quad e^+e^-{\rm-based},\\ (711.0\pm5.0_{\exp}\pm0.8_{\mathrm{rad}} \pm2.8_{\rmSU(2)})\,10^{-10} & \quad \tau {\rm -based}, \\\end{array}\right. \ where the errors have been separated according to their sources: experimental, missing radiative corrections in e + e-data, and isospin breaking. The corresponding Standard Model predictions for the muon magnetic anomaly read where the errors account for the hadronic, light-by-light (LBL) scattering and electroweak contributions. The deviations from the measurement at BNL are found to be \((22.1 \pm 7.2 \pm 3.5 \pm 8.0) 10^{-10}\) (1.9 \(\sigma\)) and \((7.4 \pm 5.8 \pm 3.5 \pm 8.0) 10^{-10}\) (0.7 \(\sigma\)) for the e + e-- and \(\tau\)-based estimates, respectively, where the second error is from the LBL contribution and the third one from the BNL measurement.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Background/Aims: Maltreatment in childhood and adolescence is a risk factor for substance use disorders (SUDs) in adulthood. This association has rarely been investigated in the light of emotion ...dysregulation. To fill this gap, this study examines emotion dysregulation and SUDs among adults with a history of early maltreatment. Methods: Comparison of emotion dysregulation in adults with a history of early abuse and neglect who developed either an SUD (n = 105) or no mental disorder (n = 54). Further, a mediation model for the association between the severity of early maltreatment and SUDs was tested. Participants completed research diagnostic interviews for psychopathology, the Difficulties in Emotion Regulation Scale, and the Childhood Trauma Questionnaire. Results: By using hierarchical regression techniques and mediational analyses controlling for age and gender, it was possible to provide evidence for the mediating role of emotion dysregulation between early emotional and physical maltreatment and later SUDs. Conclusions: Emotion dysregulation is a potential mechanism underlying the relationship between early emotional and physical maltreatment and the development of SUDs. In light of these findings, focusing on the early training of adaptive emotion regulation strategies after childhood maltreatment might be of considerable relevance to prevent the development of SUDs.
Graphene oxide (GO) was incorporated into polyamide-11 (PA11) via in-situ polymerization. The GO-PA11 nano-composite had elevated resistance to hydrolytic degradation. At a loading of 1 mg/g, GO to ...PA11, the accelerated aging equilibrium molecular weight of GO-PA11 was higher (33 and 34 kg/mol at 100 and 120 °C, respectively) compared to neat PA11 (23 and 24 kg/mol at 100 and 120 °C, respectively). Neat PA11 had hydrolysis rate constants (kH) of 2.8 and 12 ( × 10−2 day−1) when aged at 100 and 120 °C, respectively, and re-polymerization rate constants (kP) of 5.0 and 23 ( × 10−5 day−1), respectively. The higher equilibrium molecular weight for GO-PA11 loaded at 1 mg/g was the result of a decreased kH, 1.8 and 4.5 ( × 10−2 day−1), and an increased kP, 10 and 17 ( × 10−5 day−1) compared with neat PA11 at 100 and 120 °C, respectively. The decreased rate of degradation and resulting 40% increased equilibrium molecular weight of GO-PA11 was attributed to the highly asymmetric planar GO nano-sheets that inhibited the molecular mobility of water and the polymer chain. The crystallinity of the polymer matrix was similarly affected by a reduction in chain mobility during annealing due to the GO nanoparticles' chemistry and highly asymmetric nano-planar sheet structure.
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•Graphene oxide reduces extent of hydrolytic degradation in polyamide-11.•Graphene oxide reduces molecular mobility in polyamide-11.•Polyamide's amide hydrogen bonds with the graphene oxide surface.
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