19 research outputs found
Optimal renormalization and the extraction of strange quark mass from semi-leptonic -decay
We employ optimal renormalization group analysis to semi-leptonic
-decay polarization functions and extract the strange quark mass from
their moments measured by the ALEPH and OPAL collaborations. The optimal
renormalization group makes use of the renormalization group equation of a
given perturbation series which then leads to closed form sum of all the
renormalization group-accessible logarithms which have reduced scale
dependence. Using the latest theoretical inputs we find and for
ALEPH and OPAL data respectively.Comment: 3 pages, Contribution to the proceedings of the XXII DAE-BRNS High
Energy Physics Symposium, University of Delhi, Dec. 12-16, 201
Beautiful Mirrors at the LHC
We explore the "Beautiful Mirrors" model, which aims to explain the measured
value of , discrepant at the level. This scenario
introduces vector-like quarks which mix with the bottom, subtly affecting its
coupling to the . The spectrum of the new particles consists of two
bottom-like quarks and a charge -4/3 quark, all of which have electroweak
interactions with the third generation. We explore the phenomenology and
discovery reach for these new particles at the LHC, exploring single mirror
quark production modes whose rates are proportional to the same mixing
parameters which resolve the anomaly. We find that for mirror quark
masses is required to
reasonably establish the scenario and extract the relevant mixing parameters.Comment: version to be published in JHE
Anomalous coupling effects in exclusive radiative B-meson decays
The top-quark FCNC processes will be searched for at the CERN LHC, which are
correlated with the B-meson decays. In this paper, we study the effects of
top-quark anomalous interactions in the exclusive radiative and decays. With the current experimental data of
the branching ratios, the direct CP and the isospin asymmetries, bounds on the
coupling from and
from decays are derived,
respectively. The bound on from is generally compatible with that from . However, the isospin asymmetry further
restrict the phase of , and the combined bound results
in the upper limit, , which is lower than the
CDF result. For real , the upper bound on is about of the same order as the discovery
potential of ATLAS with an integrated luminosity of . For
decays, the NP contribution is enhanced by a large CKM factor
, and the constraint on coupling is rather
restrictive, . With refined
measurements to be available at the LHCb and the future super-B factories, we
can get close correlations between and the rare
decays, which will be studied directly at the LHC ATLAS and CMS.Comment: 25 pages, 15 figures, pdflate
The possible functions of duplicated ets (GGAA) motifs located near transcription start sites of various human genes
Transcription is one of the most fundamental nuclear functions and is an enzyme complex-mediated reaction that converts DNA sequences into mRNA. Analyzing DNA sequences of 5′-flanking regions of several human genes that respond to 12-O-tetradecanoyl-phorbol-13-acetate (TPA) in HL-60 cells, we have identified that the ets (GGAA) motifs are duplicated, overlapped, or clustered within a 500-bp distance from the most 5′-upstream region of the cDNA. Multiple protein factors including Ets family proteins are known to recognize and bind to the GGAA containing sequences. In addition, it has been reported that the ets motifs play important roles in regulation of various promoters. Here, we propose a molecular mechanism, defined by the presence of duplication and multiplication of the GGAA motifs, that is responsible for the initiation of transcription of several genes and for the recruitment of binding proteins to the transcription start site (TSS) of TATA-less promoters
Enhanced Specificity and Drug Delivery in Tumors by cRGD - Anchoring Thermosensitive Liposomes
Search for the and decays with the LHCb detector
A search is performed for the as yet unobserved baryonic and
decays with 3 of proton-proton collision data recorded by the LHCb
experiment. The decay is used as a
normalisation channel. No significant signal is observed for the decay. An upper limit is found on the
branching fraction of } at 90\% confidence level. Evidence is seen for
the presence of the decay at the level of
significance, with a branching fraction }.Comment: 22 pages, 6 figures. v2 is published version (very minor revisions