508 research outputs found
Higgs Bosons and the Indirect Search for WIMPs
We investigated the contribution of the MSSM Higgs bosons produced in the
neutralino annihilation in the Earth and Sun to the total WIMPs detection
signals. We found that this contribution is very important and results in a
lower bound for the muon flux from the Sun of 10^{-7} - 10^{-8} m^{-2} yr^{-1}
for neutralinos heavier than 200 GeV. We noticed that due to the SUSY charged
Higgs bosons one can expect an energetic tau neutrino flux from the Sun at a
level of 10^2 m^{-2} yr^{-1}.Comment: 10 pages, 4 figures. Talk given at Dark2000, Heidelberg, Germany,
10-15 July, 200
GAMBARAN PERAN IBU TERHADAP PERKEMBANGAN MOTORIK KASAR ANAK HIPOTIROID (STUDI KASUS DI KLINIK PENELITIAN DAN PENGEMBANGAN GAKI MAGELANG TAHUN 2015)
Salah satu manifestasi Gangguan Akibat Kekurangan Iodium pada anak adalah hipotiroid yang disertai gangguan perkembangan fisik dan mental. Salah satu manifestasi gangguan perkembangan tersebut adalah keterlambatan motorik kasar. Penelitian ini bertujuan mendeskripsikan peran ibu dalam melakukan stimulasi di rumah, terhadap perkembangan motorik kasar anak dengan riwayat hipotiroid di klinik penelitian dan pengembangan GAKI Magelang. Penelitian ini mengunakan pendekatan kualitatif eksploratif. Subyek penelitian adalah 9 ibu dari anak yang mengalami keterlambatan motorik kasar di sertai riwayat hipotiroid yang berkunjung di klinik litbang GAKI Magelang tahun 2010 – 2014. Data riwayat perkembangan motorik kasar anak diperoleh dari data sekunder, observasi dan wawancara ibu, serta pengukuran dengan Denver Development Screening Test II. Data pengetahuan ibu tentang perkembangan anak, sikap ibu menghadapi keterlambatan perkembangan anak, serta perilaku stimulasi ibu di rumah, diperoleh melalui wawancara dan observasi. Riwayat hipotiroid anak diperoleh dari data sekunder. Hasil penelitian ini menunjukan bahwa sebelum mendapat intervensi dari klinik litbang GAKI Magelang semua anak dalam penelitian ini belum mampu berjalan. Selama proses intervensi, semua anak menunjukan perbaikan kemampuan motorik kasar. Anak-anak yang ibunya tidak aktif melakukan stimulasi di rumah selama proses intervensi dari klinik Litbang GAKI Magelang, membutuhkan waktu lebih lama untuk perubahan satu tahap perkembangan motorik kasar dibandingkan anak yang ibunya secara aktif melakukan stimulasi saat dirumah. Jadi, dapat disimpulkan bahwa intervensi yang dilakukan secara lebih dini, disertai peran aktif ibu dalam memberikan stimulasi motorik kasar saat di rumah mampu meningkatkan efektifitas terapi. Hasil penelitian ini bisa menjadi bahan penyuluhan tentang pentingnya peran ibu terhadap perkembangan motorik kasar anak
Kata Kunci: Perkembangan Motorik Kasar, Stimulasi, Hipotiroi
Gluon distribution in proton at soft and hard pp collisions
We analyze the inclusive spectra of hadrons produced in collisions at
high energies in the mid-rapidity region within the soft QCD and perturbative
QCD assuming the possible creation of the soft gluons at low intrinsic
transverse momenta . From the best description of the LHC data we found
the parametrization of the unintegrated gluon distribution which at low
is different from the one obtained within the perturbative QCD.Comment: 10 pages, 5 figures. Talk given the 5th joint International HADRON
STRUCTURE '11 Conference (HS'11), Tatransk\'a Strba, Slovakia, June 27th -
July 1st, 201
Open charm and beauty production in hadron reactions
The production of charmed and beauty hadrons in proton-proton and
proton-antiproton collisions at high energies is analyzed within the modified
quark-gluon string model (QGSM) including the internal motion of quarks in
colliding hadrons. It is shown that using both the QGSM and NLO QCD one can
describe the experimental data rather successfully in a wide region of
transverse momenta. We also present some predictions for the future experiments
on the beauty baryon production in collisions at LHC energies and on the
charmed meson production in reactions at GSI energies.Comment: 8 pages, 10 figures. Talk given at International Conference on Hadron
Structure (HS 09), Tatranska Strba, Slovak Republic, August 29th-September
3rd, 200
Parity nonconservation in heavy atoms: The radiative correction enhanced by the strong electric field of the nucleus
Parity nonconservation due to the nuclear weak charge is considered. We
demonstrate that the radiative corrections to this effect due to the vacuum
fluctuations of the characteristic size larger than the nuclear radius
and smaller than the electron Compton wave-length are enhanced
because of the strong electric field of the nucleus. The parameter that allows
one to classify the corrections is the large logarithm .
The vacuum polarization contribution is enhanced by the second power of the
logarithm. Although the self-energy and the vertex corrections do not vanish,
they contain only the first power of the logarithm. The value of the radiative
correction is 0.4% for Cs and 0.9% for Tl, Pb, and Bi. We discuss also how the
correction affects the interpretation of the experimental data on parity
nonconservation in atoms.Comment: 4 pages, 3 figures, RevTe
Exact Cross Sections for the Neutralino-Slepton Coannihilation
Coannihilation processes provide an important additional mechanism for
reducing the density of stable relics in the Universe. In the case of the
stable lightest neutralino of the MSSM, and in particular the Constrained MSSM
(CMSSM), the coannihilation with sleptons plays a major role in opening up
otherwise cosmologically excluded ranges of supersymmetric parameters. In this
paper, we derive a full set of exact, analytic expressions for the
coannihilation of the lightest neutralino with the sleptons into all two--body
tree--level final states in the framework of minimal supersymmetry. We make no
simplifying assumptions about the neutralino nor about sfermion masses and
mixings other than the absence of explicit CP--violating terms and
inter--family mixings. The expressions should be particularly useful in
computing the neutralino WIMP relic abundance without the approximation of
partial wave expansion. We illustrate the effect of our analytic results with
numerical examples and demonstrate a sizeable difference with approximate
expressions available in the literature.Comment: LaTeX, 46 pages, 8 eps figure
Precise calculation of parity nonconservation in cesium and test of the standard model
We have calculated the 6s-7s parity nonconserving (PNC) E1 transition
amplitude, E_{PNC}, in cesium. We have used an improved all-order technique in
the calculation of the correlations and have included all significant
contributions to E_{PNC}. Our final value E_{PNC} = 0.904 (1 +/- 0.5 %) \times
10^{-11}iea_{B}(-Q_{W}/N) has half the uncertainty claimed in old calculations
used for the interpretation of Cs PNC experiments. The resulting nuclear weak
charge Q_{W} for Cs deviates by about 2 standard deviations from the value
predicted by the standard model.Comment: 24 pages, 8 figure
Squark-, Slepton- and Neutralino-Chargino coannihilation effects in the low-energy effective MSSM
Within the low-energy effective Minimal Supersymmetric extension of the
Standard Model (effMSSM) we calculate the neutralino relic density taking into
account slepton-neutralino, squark-neutralino and neutralino/chargino-
neutralino coannihilation channels. By including squark (stop and sbottom)
coannihilation channels we extend our comparative study to all allowed
coannihilations and obtain the general result that all of them give sizable
contributions to the reduction of the neutralino relic density. Due to these
coannihilation processes some models (mostly with large neutralino masses)
enter into the cosmologically interesting region for relic density, but other
models leave this region. Nevertheless, in general, the predictions for direct
and indirect dark matter detection rates are not strongly affected by these
coannihilation channels in the effMSSM.Comment: 14 pages, 10 figures, corrected and to be published in Phys. Rev.
Slepton and Neutralino/Chargino Coannihilations in MSSM
Within the low-energy effective Minimal Supersymmetric extension of Standard
Model (effMSSM) we calculated the neutralino relic density taking into account
slepton-neutralino and neutralino-chargino/neutralino coannihilation channels.
We performed comparative study of these channels and obtained that both of them
give sizable contributions to the reduction of the relic density. Due to these
coannihilation processes some models (mostly with large neutralino masses)
enter into the cosmologically interesting region for relic density, but other
models leave this region. Nevertheless, in general, the predictions for direct
and indirect dark matter detection rates are not strongly affected by these
coannihilation channels in the effMSSM.Comment: 12 pages, 9 figures, revte
Accurate spline solutions of the Dirac equation with parity-nonconserving potential
The complete system of the B-spline solutions for the Dirac equation with the
parity-nonconserving (PNC) weak interaction effective potential is obtained.
This system can be used for the accurate evaluation of the radiative
corrections to the PNC amplitudes in the multicharged ions and neutral atoms.
The use of the scaling procedure allows for the evaluation of the PNC matrix
elements with relative accuracy .Comment: 7 page
- …