30 research outputs found
Lepton - Chargino Mixing and R-Parity Violating SUSY
We present a study of charged lepton mass matrix diagonalization in R-parity
violating SUSY. The case in which the bilinear couplings have large
values is given special attention.Comment: 7 pages, LaTeX, 1 postscript figure, uses aipproc.sty; presented at
the 21th annual MRST meeting on High-Energy Physics, Ottawa, Canada, 10-12
May 199
Could the be substantially different from and in the supersymmetric standard model?
R-parity stands as an ad hoc assumption in the most popular version of the
supersymmetric standard model. More than fifteen years' studies of R-parity
violations have been restricted to various limiting scenarios. We illustrate
how the single-VEV parametrization provides a workable framework to analyze the
phenomenology of the complete theory of supersymmetry without R-parity. In our
comprehensive study of various aspects of the resulting leptonic phenomenology
at tree-level, we find that the physical lepton could actually bear
substantial gaugino and higgsino components, making it very different from the
and the .Comment: 7 pages in postscript. Talk given by O.K. at Tau98, to be published
in the proceedings; reprint number adde
A Simple Phenomenological Parametrization of Supersymmetry without R-Parity
We present a parametrization of the supersymmetric standard model without
R-parity that permits efficient phenomenological analyses of the full model
without a priori assumptions. Under the parametrization, which is characterized
by a single vacuum expectation value for the scalar components of the Y=-1/2
superfields, the expressions for tree-level mass matrices are quite simple.
They do not involve the trilinear R-parity violating couplings; however, the
bilinear {\mu}_i terms do enter and cannot be set to zero without additional
assumptions. We set up a framework for doing phenomenology and show some
illustrative results for fermion mass matrices and related bounds on
parameters. We find in particular that large values of tan(beta) can suppress
R-parity violating effects, substantially weakening experimental constraints.Comment: LaTeX file plus postscript figure files, 17 pages; minor
typographical changes, to appear in Physics Letters
Changing indications and socio-demographic determinants of (adeno)tonsillectomy among children in England--are they linked? A retrospective analysis of hospital data.
OBJECTIVE: To assess whether increased awareness and diagnosis of obstructive sleep apnoea syndrome (OSAS) and national guidance on tonsillectomy for recurrent tonsillitis have influenced the socio-demographic profile of children who underwent tonsillectomy over the last decade.
METHOD: Retrospective time-trends study of Hospital Episodes Statistics data. We examined the age, sex and deprivation level, alongside OSAS diagnoses, among children aged <16 years who underwent (adeno)tonsillectomy in England between 2001/2 and 2011/12.
RESULTS: Among children aged <16 years, there were 29,697 and 27,732 (adeno)tonsillectomies performed in 2001/2 and 2011/12, respectively. The median age at (adeno)tonsillectomy decreased from 7 (IQR: 5-11) to 5 (IQR: 4-9) years over the decade. (Adeno)tonsillectomy rates among children aged 4-15 years decreased by 14% from 350 (95%CI: 346-354) in 2001/2 to 300 (95%CI: 296-303) per 100,000 children in 2011/12. However, (adeno)tonsillectomy rates among children aged <4 years increased by 58% from 135 (95%CI: 131-140) to 213 (95%CI 208-219) per 100,000 children in 2001/2 and 2011/2, respectively. OSAS diagnoses among children aged <4 years who underwent surgery increased from 18% to 39% between these study years and the proportion of children aged <4 years with OSAS from the most deprived areas increased from 5% to 12%, respectively.
CONCLUSIONS: (Adeno)tonsillectomy rates declined among children aged 4-15 years, which reflects national guidelines recommending the restriction of the operation to children with more severe recurrent throat infections. However, (adeno)tonsillectomy rates among pre-school children substantially increased over the past decade and one in five children undergoing the operation was aged <4 years in 2011/12.The increase in surgery rates in younger children is likely to have been driven by increased awareness and detection of OSAS, particularly among children from the most deprived areas
Detecting Higgs Boson Decay to Neutralinos at Hadron Supercolliders
We examine prospects for detecting the neutral Higgs bosons of minimal
supersymmetric models (MSSM) when their decays into neutralino pairs are
kinematically allowed. The best signature appears to be
H_h,H_p\to\tz_2\tz_2\to 4\ell +\eslt. We argue that Standard Model
contributions to this signature are negligible, and examine regions of MSSM
parameter space where the four lepton mode should be observable at the Large
Hadron Collider. The same signal can also come from continuum neutralino pair
production. We propose a set of cuts to illustrate that the neutralino decay
mode of the Higgs bosons provides a viable signal over a substantial range of
model parameters, and show that it may be separable from continuum neutralino
production if sufficient integrated luminosity can be accumulated.Comment: 15 pages (REVTEX), 7 figures available by regular mail,
FSU-HEP-940204, UH-511-781-9
Supersymmetry without R-parity : Constraints from Leptonic Phenomenology
R-parity conservation is an {\it ad hoc} assumption in the most popular
version of the supersymmetric standard model. Most studies of models which do
allow for R-parity violation have been restricted to various limiting
scenarios. The single-VEV parametrization used in this paper provides a
workable framework to analyze phenomenology of the most general theory of SUSY
without R-parity. We perform a comprehensive study of leptonic phenomenology at
tree-level. Experimental constraints on various processes are studied
individually and then combined to yield regions of admissible parameter space.
In particular, we show that large R-parity violating bilinear couplings are not
ruled out, especially for large .Comment: 56 pages Revtex with figures incorporated; typos (including
transcription typo in Table II) and minor corrections; proof-read version, to
appear in Phys. Rev.
H. N. Werkman
A piece commissioned for COLDFRONT â Singular Vispo :: First Encounters.
Artists were asked to talk about their introduction to Visual Poetry and the piece of work that changed the way they saw language