Negative S and Light New Physics *

نویسندگان

  • P. Bamert
  • C. P. Burgess
چکیده

The several sigma difference between SLD's recent precise measurement of A LR and the corresponding LEP results tends to reinforce the earlier trends in the data towards negative values for the Peskin-Takeuchi parameter S and T. Motivated by this not yet statistically significant, but suggestive, trend, we explore which kinds of new particles can (1) contribute dominantly to new physics through oblique corrections, (2) produce negative values for S and T , and (3) not be in conflict with any other experiments, on or off the Z resonance. We are typically led to models which involve new particles with masses that are not much heavier than M Z /2, and so which would also have implications for other experiments in the near future. We show how the analysis of such 'light-new-physics' models in terms of oblique parameters requires the interpretation of the data in terms of modified parameters, S ′ and T ′ , whose difference from S and T improves the available parameter space of the models.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Antimicrobial Photothermal Treatment of Pseudomonas Aeruginosa by a Carbon Nanoparticles-Polypyrrole Nanocomposite

Background: Nowadays, it is needed to explore new routes to treat infectious bacterial pathogens due to prevalence of antibiotic-resistant bacteria. Antimicrobial photothermal therapy (PTT), as a new strategy, eradicates pathogenic bacteria.Objective: In this study, the antimicrobial effects of a carbon nanoparticles-polypyrrole nanocomposite (C-PPy) upon laser irradiation were investigat...

متن کامل

New Method of Quality Control Test for Light and Radiation Field Coincidence in Medical Linear Accelerators

Introduction: The evaluation of X-ray and light field coincidence in linear accelerators as a quality control test is often performed subjectively, involving the manual marking of films and their visual inspection following the irradiation. Therefore, the present study aimed to develop an objective method for the performance of this test leading to the increased levels...

متن کامل

Investigation of the Effect of Recombination on Superluminescent Light-Emitting Diode Output Power Based on Nitride Pyramid Quantum Dots

In this article, the temperature behavior of output power of superluminescent light-emitting diode (SLED) by considering the effect of non-radiative recombination coefficient, non-radiative spontaneous emission coefficient and Auger recombination coefficients has been investigated. For this aim, GaN pyramidal quantum dots were used as the active region. The numerical method has been used to sol...

متن کامل

New electrical device for field coincidence quality control test in linear accelerators

Testing of the coincidence of a linear accelerators X-ray field and the light field as a quality control test is often done in a subjective method, involving the manual marking of pieces of film and the visual inspection of the film after irradiation. The purpose of this study was to develop an objective method for performing this test, while also increasing the accuracy, precision and the spee...

متن کامل

Numerical Investigation of Birefringene Effect on the Light Reflection

In the present paper, the problem of light reflection from a birefringent medium and thin film is considered. First, the analytical equations governing the propagation of a plane and harmonic electromagnetic wave in an infinite, birefringent, linear, non-dispersive, non-absorbing, and non-magnetic medium is derived from Maxwell equations. Then, using phase matching condition and boundary condit...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 1994