18663755
Gauge extensions of supersymmetric models and hidden valleys
Supersymmetric models with extended group structure beyond the standard model are revisited in the framework of general gauge mediation. Sum rules for sfermion masses are shown to depend genuinely on the group structure, which can serve as important probes for specific models. The left-right model and models with extra U(1) are worked out for illustrations. If the couplings of extra gauge groups are small, supersymmetric hidden valleys of the scale 10-100 GeV can be naturally constructed in companion of a TeV-scale supersymmetric visible sector.
118417796
A note on bounds of scalar operators in perturbative SCFTs
Abstract Bounds on anomalous dimensions of scalar operators in 4D superconformal field theory are explored through perturbative viewpoint. Following the recent work of Green and Shih, in which a conjecture involved this issue is verified at the NLO, we consider the NNLO corrections to the bounds, which are important in some situations and can be divided into two cases where O ( λ 4 ) or O ( y 2 ) effects dominate respectively. In the former case, we find that the conjecture is maintained at NNLO, while in the later case the statement still holds due to null correction.
15736457
E2 Instanton Effects and Higgs Physics In Intersecting Brane Models
String instanton effects in Higgs physics are discussed through a type IIA model based on T^{6}/(Z^{2}\times Z^{'2}) orentifold compactifaction. By inclusion of rigid E2-branes, the model exhibits a MSSM-like spectrum, as well as extra mu and quartic Higgs couplings. These extra couplings are induced via E2 instantons non-perturbatively. Setting the string scale at 10^{18} GeV, one gets interesting TeV Higgs physics. In particlular, the tree-level Higgs mass can be uplifted substantially.
118830624
Focus point from direct gauge mediation
This paperis devoted to the reconciliation of the tension between the theoretic expectation from naturalness and the present LHC limits on the superpartner mass bounds. We argue that in supersymmetry models of direct gauge mediation the focusing phenomenon appears, which dramatically reduces the fine tuning associated to the 126 GeV Higgs boson. This type of model is highly predictive as regards the mass spectrum, with a multi-TeV third generation, the $$A_t$$At term of order 1 TeV, gluino mass above LHC mass bound, and the light neutralinos and charginos below 1 TeV.
118398526
Phenomenologies of Higgs messenger models
In this paper, we investigate the phenomenologies of models where the Higgs sector plays the role of messengers in gauge mediation. The minimal Higgs sector and its extension are considered respectively. We find that there exist viable models when an appropriate parity is imposed. Phenomenological features in these kind of models include three approximate sum rules for scalar masses, light gluino as well as one-loop µ and two-loop Bµ terms.
41631320
On dark matter selected high-scale supersymmetry
A bstractThe prediction for the Higgs mass in the dark matter selected high-scale SUSY is explored. We show the bounds on SUSY-breaking scale in models of SM +w˜$$ +\tilde{w} $$ and SM +h˜/s˜$$ +\tilde{h}/\tilde{s} $$ due to the observed Higgs mass at the LHC. We propose that effective theory below scale m˜$$ \tilde{m} $$ described by SM +w˜$$ +\tilde{w} $$ is possibly realized in gauge mediation with multiple spurion fields that exhibit significant mass hierarchy, and that by SM +h˜/s˜$$ +\tilde{h}/\tilde{s} $$ can be realized with direct singlet-messenger-messenger coupling for singlet Yukawa coupling λ∼v/m˜1/2gSM$$ \lambda \sim {\left(v/\tilde{m}\right)}^{1/2}{g}_{\mathrm{SM}} $$. Finally, the constraint on high-scale SUSY is investigated in the light of inflation physics if these two subjects are directly related.
13975142
Calibration of BC501A liquid scintillator cells with monochromatic neutron beams
Abstract The recoil proton energy response has been measured by exposing cylindrical cells, filled with BC501A BICRON liquid scintillator, to mono-energetic neutron reference fields. We determine the required calibration parameters and report the detailed procedures for the experimental data handling. A dedicated Monte Carlo simulation of the detector response and efficiency has been performed. It showed good agreement with the measured quantities. The results from this calibration are necessary for a detailed study of the neutron spectrum at the underground Gran Sasso Laboratory, with a neutron detector made of 32 liquid scintillator cells, like those used during the calibration.
122659739
The BES upgrade
Abstract The Beijing Spectrometer (BES) detector is a general purpose solenoid detector at the Beijing Electron Positron Collider (BEPC) in Beijing, China, that has collected large numbers of J/ψ, ψ′, D s , D and τ events. In this paper, we describe the recent upgrade of the initial BES detector (BESI) to the improved BESII detector.