56 research outputs found
A simultaneous explanation of the large phase in B_s-\bar B_s mixing and B --> \pi\pi / \pi K puzzles in R-parity violating supersymmetry
Recent data on meson mixings and decays are, in general, in accord with
the standard model expectations, except showing a few hiccups: (i) a large
phase in mixing, (ii) a significant difference () between
CP-asymmetries in and channels,
and (iii) a larger than expected branching ratio in
channel. We show that selective baryon number violating Yukawa couplings in
R-parity violating supersymmetry can reconcile all the measurements.Comment: 8 pages, 4 eps figs; v2: minor errors corrected, fig.2a redrawn with
correct y-axis labels, footnote on updated UTfit result on Bs mixing phase
added, References and Acknowledgements sections update
Semi-Symmetric Metric Connection on a 3-Dimensional Trans-Sasakian Manifold
The object of the present paper is to study the nature of curvature tensor, Ricci tensor, scalar curvature and Weyl conformal curvature tensors with respect to a semi-symmetric metric connection on a 3-dimensional trans-Sasakian manifold.We have given an example regarding it
On factorization of the shift semigroup
Let on
be the right shift semigroup for a separable
Hilbert space . Let and
be a pair of semigroups of contractions
which satisfy and for every . Such a pair is called a factorization of
. The main result of this note completely describes
all factorizations of when is finite
dimensional. Using the known fact that is unitarily
equivalent to a semigroup of multiplication operators on the vector valued
Hardy space , we employ novel function theoretic
methods and classical convex analysis to arrive at the factorization
Correlated enhancements in , of muon, and lepton flavor violating decays with two R-parity violating couplings
With just two R-parity violating couplings, and
, we correlate several channels, namely,
(), , and some lepton flavor violating
decays. For and for a common
superpartner mass of 300 GeV, which explain the recently observed excesses in
the above decay channels, we predict the following R-parity violating
contributions: , , , and .
We exhibit our results through observable versus observable correlation plots.Comment: 12 pages, 8 figures: v2: An equation and a few comments and
references added, version to appear in Nucl Phys
Frederic Andrews Gibbs and the assassination of John Fitzgerald Kennedy
Frederic Gibbs, the peerless expert on electroencephalogrphy was summoned to provide opinion on the EEG tracing of Jack Ruby, who murdered Lee Harvey Oswald, the assassin of John Fitzgerald Kennedy, the American President, in 1963. Gibbs pleaded that the tracing suggested features indicative of psychomotor epilepsy and Ruby killed Oswald in a state of fugue. His view was not agreed upon but Gibbs stood his ground unflinchingly. Subsequent appeals to the higher court spared Ruby from imminent execution and finally he died a natural death from metastatic complications of carcinoma of the lung in 1967
The stretch reflex and the contributions of C David Marsden
The stretch reflex or myotatic reflex refers to the contraction of a muscle in response to its passive stretching by increasing its contractility as long as the stretch is within physiological limits. For ages, it was thought that the stretch reflex was of short latency and it was synonymous with the tendon reflex, subserving the same spinal reflex arc. However, disparities in the status of the two reflexes in certain clinical situations led Marsden and his collaborators to carry out a series of experiments that helped to establish that the two reflexes had different pathways. That the two reflexes are dissociated has been proved by the fact that the stretch reflex and the tendon reflex, elicited by stimulation of the same muscle, have different latencies, that of the stretch reflex being considerably longer. They hypothesized that the stretch reflex had a transcortical course before it reached the spinal motor neurons for final firing. Additionally, the phenomenon of stimulus-sensitive cortical myoclonus lent further evidence to the presence of the transcortical loop where the EEG correlate preceded the EMG discharge. This concept has been worked out by later neurologists in great detail , and the general consensus is that indeed, the stretch reflex is endowed with a conspicuous transcortical component
Johann bernhard aloys von Gudden and the Mad King of Bavaria
Bernhard von Gudden was a psychiatrist in Prussia and he was summoned in March 1886 to examine King Ludwig II for his apparently insane activities like, profligate spending and erratic behaviour. A team of four estimable psychiatrists pronounced that he was not capable ruling. Consequently, he was dethroned and kept in a castle under supervision of von Gudden. Gudden championed the idea of 'no restraint' and advocated free movement of insane persons and one evening in June, he accompanied the King during an evening stroll to a lake. A few hours later, the corpus of both of them were recovered under mysterious circumstances. Autopsy suggested that the King was drowned but no post-mortem examination was performed on von Gudden. There are plenty of controversies regarding their death like, murder, accidental death or even natural death from cardiac arrest following immersion in cold water, but no incontrovertible conclusion could be arrived at, even after scrupulous analysis by historians and even the diagnosis of insanity of the King has been doubted. Some even suggested that the opinion of psychiatrists were sought as a pretense in order to depose the King
Edgar adrian and patrick merton: Names blurred with the passage of time
Edgar Douglas Adrian and Patrick Anthony Merton are two supreme neurophysiologists from England in the last century whose names are almost forgotten these days. Adrian's work on all-or-none phenomenon in nerve and muscle excitability ushered in a new era and Merton's servo theory of muscular movement and muscle fatigue added a new dimension to the understanding of stretch reflex and deep tendon reflexes. Both of them trained and worked at Trinity College, Cambridge and both were elected as Fellow of the Royal Society and Adrian in addition, was awarded the Nobel Prize in 1932 along with Charles Scott Sherrington
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