1,182 research outputs found
Effectiveness of Sintetic Retardan on Growth and Display Period of Sunflower (Hellianthus annus L.).
The aims of research are to know the effects of Sintetic Retardanon the growth of sunflower and determine the effectivenessof Sintetic Retardan on the growthand display period of sunflower. This research was conducted in experiment land of STIPER Kutai Timur from November 2016 to March 2017, used a Completely Randomize Design with 4 treatments and 6 replications. The material of Sintetic Retardan is paclobutrazol. The treatment consisted of (P0)0 ppm, (P1) 40 ppm, (P2) 50 ppm, (P3) 60 ppm. The results showed that paclobutrazol gave significant effect to the growth of sunflower on parameter hight of plant and diameter of stem but not significant on number of leaves. Concentrate 50 ppm of paclobutrazol showed more effectiveness than others on the growth and the display period
Higgs-mediated FCNCs: Natural Flavour Conservation vs. Minimal Flavour Violation
We compare the effectiveness of two hypotheses, Natural Flavour Conservation
(NFC) and Minimal Flavour Violation (MFV), in suppressing the strength of
flavour-changing neutral-currents (FCNCs) in models with more than one Higgs
doublet. We show that the MFV hypothesis, in its general formulation, is more
stable in suppressing FCNCs than the hypothesis of NFC alone when quantum
corrections are taken into account. The phenomenological implications of the
two scenarios are discussed analysing meson-antimeson mixing observables and
the rare decays B -> mu+ mu-. We demonstrate that, introducing flavour-blind CP
phases, two-Higgs doublet models respecting the MFV hypothesis can accommodate
a large CP-violating phase in Bs mixing, as hinted by CDF and D0 data and,
without extra free parameters, soften significantly in a correlated manner the
observed anomaly in the relation between epsilon_K and S_psi_K.Comment: 27 pages, 4 figures. v3: minor modifications (typos corrected and few
refs. added), conclusions unchanged; journal versio
Neutral Gauge Boson Contributions to the Dimuon Charge Asymmetry in B Decays
Recently, the D0 Collaboration measured the CP-violating like-sign dimuon
charge asymmetry in neutral B decays, finding a 3.2sigma difference from the
standard-model (SM) prediction. A non-SM charge asymmetry a_sl^s suggests a
new-physics (NP) contribution to Bs-Bsbar mixing. In this case, in order to
explain the measured value of a_sl^s within its 1sigma range, NP must be
present in Gamma_12^s, the absorptive part of the mixing. In this paper, we
examine whether such an explanation is possible in models with flavor-changing
Z (ZFCNC) or Z' (Z'FCNC) gauge bosons. The models must also reproduce the
measured values of the indirect CP asymmetry S_psi-phi in Bs -> J/psi phi, and
Delta Gamma_s, the Bs-Bsbar width difference. We find that the ZFCNC model
cannot reproduce the present measured values of S_psi-phi and a_sl^s within
their 1sigma ranges. On the other hand, in the Z'FCNC model, the values of all
three observables can be simultaneously reproduced.Comment: 18 pages, 7 figures, JHEP format. Some ZFCNC equations corrected,
ZFCNC analysis redone, references added, conclusions unchange
New Physics in Bs -> J/psi phi: a General Analysis
Recently, the CDF and D0 collaborations measured indirect CP violation in Bs
-> J/psi phi and found a hint of a signal. If taken at face value, this can be
interpreted as a nonzero phase of Bs-Bsbar mixing (beta_s), in disagreement
with the standard model, which predicts that beta_s ~= 0. In this paper, we
argue that this analysis may be incomplete. In particular, there can be new
physics (NP) in the bbar -> sbar c cbar decay. If so, the value of beta_s is
different than for the case in which NP is assumed to be present only in the
mixing. We have examined several models of NP and found that, indeed, there can
be significant contributions to the decay. These effects are consistent with
measurements in B -> J/psi K* and Bd -> J/psi Ks. Due to the NP in the decay,
polarization-dependent indirect CP asymmetries and triple-product asymmetries
are predicted in Bs -> J/psi phi.Comment: 28 pages, JHEP, no figures. Considerable changes made. Abstract and
main text of paper modified to alter presentation. Appendix added. References
added. Conclusions unchanged
A fourth generation, anomalous like-sign dimuon charge asymmetry and the LHC
A fourth chiral generation, with in the range GeV and a moderate value of the CP-violating phase can explain the
anomalous like-sign dimuon charge asymmetry observed recently by the D0
collaboration. The required parameters are found to be consistent with
constraints from other and decays. The presence of such quarks, apart
from being detectable in the early stages of the LHC, would also have important
consequences in the electroweak symmetry breaking sector.Comment: 18 pages, 9 figures, Figure 1 is modified, more discussions are added
in section 2. new references adde
Formulae for the Analysis of the Flavor-Tagged Decay B^0_s --> Jpsi phi
Differential rates in the decay B^0_s --> Jpsi phi, with phi --> K^+K^- and
Jpsi --> mu^+ mu^- are sensitive to the CP-violation phase beta_s, predicted to
be very small in the standard model. The analysis of B^0_s --> Jpsi phi decays
is also suitable for measuring the B^0_s lifetime, the decay width difference
DeltaGamma_s between the B^0_s mass eigenstates, and the B^0_s oscillation
frequency Delta m even if appreciable CP violation does not occur. In this
paper we present normalized probability densities useful in maximum likelihood
fits, extended to allow for S-wave contributions on one hand and for the
effects of direct CP violation on the other. Our treatment of the S-wave
contributions includes the strong variation of the S-wave/P-wave amplitude
ratio with m(K^+K^-) across the phi resonance, which was not considered in
previous work. We include a scheme for re-normalizing the probability densities
after detector sculpting of the angular distributions of the final state
particles, and conclude with an examination of the symmetries of the rate
formulae, with and without an S-wave contribution. All results are obtained
with the use of a new compact formalism describing the differential decay rate
of B^0_s mesons into Jpsi phi final states.Comment: 19 pages, no figures. Revised for JHE
Integrable Models of Internal Gravity Water Waves Beneath a Flat Surface
A two-layer fluid system separated by a pycnocline in the form of an internal wave is considered. The lower layer is bounded below by a flat bottom and the upper layer is bounded above by a flat surface. The fluids are incompressible and inviscid and Coriolis forces as well as currents are taken into consideration. A Hamiltonian formulation is presented and appropriate scaling leads to a KdV approximation. Additionally, considering the lower layer to be infinitely deep leads to a Benjamin-Ono approximation
Predictions for b -> ssdbar, ddsbar decays in the SM and with new physics
The b -> ssdbar and b -> ddsbar decays are highly suppressed in the SM, and
are thus good probes of new physics (NP) effects. We discuss in detail the
structure of the relevant SM effective Hamiltonian pointing out the presence of
nonlocal contributions which can be about \lambda^{-4} (m_c^2/m_t^2) ~ 30% of
the local operators (\lambda = 0.21 is the Cabibbo angle). The matrix elements
of the local operators are computed with little hadronic uncertainty by
relating them through flavor SU(3) to the observed \Delta S = 0 decays. We
identify a general NP mechanism which can lead to the branching fractions of
the b\to ss\bar d modes at or just below the present experimental bounds, while
satisfying the bounds from K-Kbar and B_{(s)}-Bbar_{(s)} mixing. It involves
the exchange of a NP field carrying a conserved charge, broken only by its
flavor couplings. The size of branching fractions within MFV, NMFV and general
flavor violating NP are also predicted. We show that in the future energy
scales higher than 10^3 TeV could be probed without hadronic uncertainties even
for b-> s and b-> d transitions, if enough statistics becomes available.Comment: 30 pages, one eps figur
Diffractive Dijet Production at sqrt(s)=630 and 1800 GeV at the Fermilab Tevatron
We report a measurement of the diffractive structure function of
the antiproton obtained from a study of dijet events produced in association
with a leading antiproton in collisions at GeV at the
Fermilab Tevatron. The ratio of at GeV to
obtained from a similar measurement at GeV is compared with
expectations from QCD factorization and with theoretical predictions. We also
report a measurement of the (-Pomeron) and ( of parton in
Pomeron) dependence of at GeV. In the region
, GeV and , is
found to be of the form , which obeys
- factorization.Comment: LaTeX, 9 pages, Submitted to Phys. Rev. Letter
Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at √ s = 8 TeV with the ATLAS detector
Results of a search for new phenomena in final states with an energetic jet and large missing transverse momentum are reported. The search uses 20.3 fb−1 of √ s = 8 TeV data collected in 2012 with the ATLAS detector at the LHC. Events are required to have at least one jet with pT > 120 GeV and no leptons. Nine signal regions are considered with increasing missing transverse momentum requirements between Emiss T > 150 GeV and Emiss T > 700 GeV. Good agreement is observed between the number of events in data and Standard Model expectations. The results are translated into exclusion limits on models with either large extra spatial dimensions, pair production of weakly interacting dark matter candidates, or production of very light gravitinos in a gauge-mediated supersymmetric model. In addition, limits on the production of an invisibly decaying Higgs-like boson leading to similar topologies in the final state are presente
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