110445102
Operating a production pilot factory serving several scientific domains
Pilot infrastructures are becoming prominent players in the Grid environment. One of the major advantages is represented by the reduced effort required by the user communities (also known as Virtual Organizations or VOs) due to the outsourcing of the Grid interfacing services, i.e. the pilot factory, to Grid experts. One such pilot factory, based on the glideinWMS pilot infrastructure, is being operated by the Open Science Grid at University of California San Diego (UCSD). This pilot factory is serving multiple VOs from several scientific domains. Currently the three major clients are the analysis operations of the HEP experiment CMS, the community VO HCC, which serves mostly math, biology and computer science users, and the structural biology VO NEBioGrid. The UCSD glidein factory allows the served VOs to use Grid resources distributed over 150 sites in North and South America, in Europe, and in Asia. This paper presents the steps taken to create a production quality pilot factory, together with the challenges encountered along the road.
56563443
On Limit Cycles in Supersymmetric Theories
Abstract Contrary to popular belief conformality does not require zero beta functions. This follows from the work of Jack and Osborn, and examples in non-supersymmetric theories were recently found by some of us. In this Letter we show that such examples are absent in unitary N = 1 supersymmetric four-dimensional field theories. More specifically, we show to all orders in perturbation theory that the beta-function vector field of such theories does not admit limit cycles. A corollary of our result is that unitary N = 1 supersymmetric four-dimensional theories cannot be superscale-invariant without being superconformal.
89614484
Searching for new physics in the three-body decays of the Higgs-like particle
A bstractWe show that the three-body decays of the resonance recently discovered at the LHC are potentially sensitive to effects of new physics. Even if the fully integrated partial decay widths are consistent with the minimal Standard Model there is information that is lost upon integration, which can be uncovered in the differential decay widths. Concentrating on the decay h → Zℓ$ \overline{\ell} $, we identify the regions in the three-body phase space in which these effects become especially pronounced and could be detected in future experiments.
2024174
Bottom-quark forward-backward asymmetry in the standard model and beyond.
We computed the bottom-quark forward-backward asymmetry at the Tevatron in the standard model (SM) and for several new physics scenarios. Near the Z pole, the SM bottom asymmetry is dominated by tree level exchanges of electroweak gauge bosons. While above the Z pole, next-to-leading order QCD dominates the SM asymmetry as was the case with the top-quark forward-backward asymmetry. Light new physics, M(NP)≲150  GeV, can cause significant deviations from the SM prediction for the bottom asymmetry. The bottom asymmetry can be used to distinguish between competing new physics (NP) explanations of the top asymmetry based on how the NP interferes with s-channel gluon and Z exchange.
111901753
The brass plug monument system for doubler alignment
The system of brass plugs set in the Main Ring tunnel floor for use in radial alignment of Doubler elements is described. Considerations leading to the choice of plug positions and properties are discussed. The quantitative relationship between the plugs and the Doubler orbit is presented in sufficient detail so that they can be used by anybody to align Doubler elements both radially and along the beam. Neither the origin or the accuracy of the system is discussed in detail.
172822549
Inclusive J / $\psi$ Production at D0
122661247
The super fixed target beauty facility at the SSC
Abstract The rationale for pursuing beauty physics at the SSC in a fixed target configuration is described. The increased beauty production cross section at the SSC, combined with high interaction rate capability of the proposed detector, results in 10 10–11 produced BB events per year. The long decay length of the B hadrons (≌10 cm) allows direct observation of B decays in the high resolution silicon microstrip vertex detector. To optimize the operation of the proposed beauty spectrometer and the SSC, parasitic extraction of attendant or artificially generated large amplitude protons using crystal channeling is proposed and explored. The large sample of fully reconstructed B events allows detailed studies various CP violating decays with requisite statistics to confront the standard model. The CP physics potentials of the proposed experiment is evaluated and compared with alternative approaches, such as asymmetric e + e − B Factories and specialized hadron colliders.
126188523
Low Divergence Beam in Proton West
117827083
Modification to footprint to accommodate an external fixed-target hall
Based on a note from C.T. Murphy on SSC Crystal Extracted Beams, we propose a modification to the footprint for the East Campus to accommodate an external beam area for 20-TeV protons. Because Murphy`s analysis uses a somewhat out-of-date ring configuration, it had to be modified to fit the current machine parameters. However, the same principles were applied. (The revised Murphy note of 9/16/89 uses the current machine parameters and is consistent with this memo.) Basically, to avoid sitting in the halo of the hewn from IR6 and IR7, the external proton hall must sit 9000 ft downstream of the center of the utility straight on the East Campus. For a crystal-extracted beam of 108 protons per second, the beam would simply drift this entire distance to the experimental hall. Some quads might be installed if necessary to transport the beam to the ham or to shape the beam. If at some time in the future the full SSC were to be extracted, this drift could be used to form secondary beamlines for very-high-energy, fixed-target experiments with pion, kaon, or muon beams. In order to accommodate the possibility of full beam extraction, the muon vectors were chosen to be 17,000 more » ft long. The control of the land for this distance assures that no radiation will be allowed to leave the site, regardless of how the program might evolve in the future. This land need only be procured under stratified fee. At the end of this area, some land could be procured on a fee simple basis to provide a space for radiation monitors. This area could also be used ultimately for a future neutrino experiment. « less