Latest highlights from CDF

The CDF II experiment at the Fermilab Tevatron collider has been running steadily for many years accumulating large datasets which allow to probe many facets of the Standard Model and its possible extensions over a wide range of processes. This contribution presents an overview of the CDF physics program focusing on the most recent results as of April 2010. The CDF II experiment at the Fermilab Tevatron collider has been steadily acquiring data since the beginning of 2002. The large accumulated datasets allow CDF to pursue a very rich and broad physics program, which is probing many facets of the Standard Model (SM) and its possible extensions over a wide range of processes, whose cross sections span over 10 orders of magnitude, from the tens of millibarns of the total p {bar p} cross section to the fraction of a picobarn expected for the production of the SM Higgs boson. The CDF investigation of the fundamental constituents of matter is organized on the basis of the phenomena and the sector of the Standard Model which are being explored: the study of the strong interactions between the quarks and gluons in the colliding nucleons, the b- and c-quark flavor physics, the properties of the top quark and the electroweak gauge bosons, the electroweak symmetry breaking and the Higgs boson, the searches for physics beyond the Standard Model. Following this baseline the contribution will review the CDF physics program focusing on the most recent results as of April 2010: Sec. 2 briefly describes the experimental apparatus, the Tevatron collider and the CDF detector, in the subsequent Sections the results are presented

Mono-chromatic single photon events at the muon collider

The cross section for lepton pair annihilation into a photon and a dark photon or an axion-like particle is constant for large center-of-mass energies because some of the portal operators coupling Standard Model and dark sector are proportional to the energy. Feebly coupled though they are, these portal operators will be enhanced by the large center-of-mass energy made available by a muon collider and thus provide the ideal example of possible physics beyond the Standard Model to be studied with such a machine. We discuss the characteristic signature of the presence of these operators: mono-chromatic single photon events for the two benchmarks of having center-of-mass energies of 3 and 10 TeV and integrated luminosity of, respectively, 1 and 10 ab$^{-1}$. We find that an effective scale of the portal operator as large as $\Lambda=112$ TeV for an axion-like particle and $\Lambda=141$ TeV for a dark photon can be separated from the background with a confidence level of 95% in the first benchmark; these interaction scales can be raised to $\Lambda=375$ TeV and $\Lambda=459$ TeV in the case of the second benchmark. The signal for the pseudo-scalar particle can be distinguished from that of the spin-1 with about 200 events. The response of the detector to high-energy photons is examined.Comment: 12 pages, 9 figure

STUDY OF THE NEUTRAL DECAYS OF THE KL FOR THE CP VIOLATION MEASUREMENT AT KLOE

2000/2001XIV Ciclo1972Versione digitalizzata della tesi di dottorato cartacea

Oscilacije Bs0

For a long time, the B0 s -B¯0 s system has eluded a complete investigation of its observables. Only recently, the Tevatron experiments have accumulated sizable B0 s samples which allow a direct and precise study of the system properties. This contribution reviews the most up-to-date measurements by the CDF and DØ Collaborations of the B0 s -B¯0 s system parameters: the mass and decay-width differences, ∆ms and ∆Γs between the heavy and light B0 s mass eigenstates, the average decay width Γs and the CP-violating phase in the mixing φs.Dugo je vremena sustav B0 s -B¯0 s bio nedokučiv potpunim istraživanjima svojih fizičkih veličina. Tek su nedavna mjerenja na Tevatronu sakupila poveće uzorke B0 s koji omogućuju izravno i točno proučavanje svojstava tog sustava. Ovdje se daje pregled najnovijih mjerenja parametara sustava B0 s -B¯0 s koja su obavila suradnje DØ i CDF: razlike masa i širina raspada teškog i lakog svojstvenog stanja B0 s , ∆ms i ∆Γs, prosječne širine raspada, Γs i faze miješanja koja krši CP, φs

Preliminary Report on the Study of Beam-Induced Background Effects at a Muon Collider

Physics at a multi-TeV muon collider needs a change of perspective for the detector design due to the large amount of background induced by muon beam decays. Preliminary studies, based on simulated data, on the composition and the characteristics of the particles originated from the muon decays and reaching the detectors are presented here. The reconstruction performance of the physics processes $H\to b\bar b$ and $Z\to b\bar b$ has been investigated for the time being without the effect of the machine induced background. A preliminary study of the environment hazard due to the radiation induced by neutrino interactions with the matter is presented using the FLUKA simulation program

Charged Particle Tracking in Real-Time Using a Full-Mesh Data Delivery Architecture and Associative Memory Techniques

We present a flexible and scalable approach to address the challenges of charged particle track reconstruction in real-time event filters (Level-1 triggers) in collider physics experiments. The method described here is based on a full-mesh architecture for data distribution and relies on the Associative Memory approach to implement a pattern recognition algorithm that quickly identifies and organizes hits associated to trajectories of particles originating from particle collisions. We describe a successful implementation of a demonstration system composed of several innovative hardware and algorithmic elements. The implementation of a full-size system relies on the assumption that an Associative Memory device with the sufficient pattern density becomes available in the future, either through a dedicated ASIC or a modern FPGA. We demonstrate excellent performance in terms of track reconstruction efficiency, purity, momentum resolution, and processing time measured with data from a simulated LHC-like tracking detector

Severe early onset preeclampsia: short and long term clinical, psychosocial and biochemical aspects

Preeclampsia is a pregnancy specific disorder commonly defined as de novo hypertension and proteinuria after 20 weeks gestational age. It occurs in approximately 3-5% of pregnancies and it is still a major cause of both foetal and maternal morbidity and mortality worldwide1. As extensive research has not yet elucidated the aetiology of preeclampsia, there are no rational preventive or therapeutic interventions available. The only rational treatment is delivery, which benefits the mother but is not in the interest of the foetus, if remote from term. Early onset preeclampsia (<32 weeks’ gestational age) occurs in less than 1% of pregnancies. It is, however often associated with maternal morbidity as the risk of progression to severe maternal disease is inversely related with gestational age at onset2. Resulting prematurity is therefore the main cause of neonatal mortality and morbidity in patients with severe preeclampsia3. Although the discussion is ongoing, perinatal survival is suggested to be increased in patients with preterm preeclampsia by expectant, non-interventional management. This temporising treatment option to lengthen pregnancy includes the use of antihypertensive medication to control hypertension, magnesium sulphate to prevent eclampsia and corticosteroids to enhance foetal lung maturity4. With optimal maternal haemodynamic status and reassuring foetal condition this results on average in an extension of 2 weeks. Prolongation of these pregnancies is a great challenge for clinicians to balance between potential maternal risks on one the eve hand and possible foetal benefits on the other. Clinical controversies regarding prolongation of preterm preeclamptic pregnancies still exist – also taking into account that preeclampsia is the leading cause of maternal mortality in the Netherlands5 - a debate which is even more pronounced in very preterm pregnancies with questionable foetal viability6-9. Do maternal risks of prolongation of these very early pregnancies outweigh the chances of neonatal survival? Counselling of women with very early onset preeclampsia not only comprises of knowledge of the outcome of those particular pregnancies, but also knowledge of outcomes of future pregnancies of these women is of major clinical importance. This thesis opens with a review of the literature on identifiable risk factors of preeclampsia

Penilaian Kinerja Keuangan Koperasi di Kabupaten Pelalawan

This paper describe development and financial performance of cooperative in District Pelalawan among 2007 - 2008. Studies on primary and secondary cooperative in 12 sub-districts. Method in this stady use performance measuring of productivity, efficiency, growth, liquidity, and solvability of cooperative. Productivity of cooperative in Pelalawan was highly but efficiency still low. Profit and income were highly, even liquidity of cooperative very high, and solvability was good