B and B_S decay constants from moments of Finite Energy Sum Rules in QCD

We use an appropriate combination of moments of finite energy sum rules in QCD in order to compute the B_q-meson decays constants f_B and f_{B_s}.We perform the calculation using a two-loop computation of the imaginary part of the pseudoscalar two point function in terms of the running bottom quark mass. The results are stable with the so called QCD duality threshold and they are in agreement with the estimates obtained from Borel transform QCD sum rules and lattice computations.Comment: 11 pages, 2 figure

High Energy Gamma--Radiation from the Galactic Center due to Neutralino Annihilation

We study the NGS (Non--dissipative Gravitational Singularity) model, which successfully describes the non--linear stage of evolution of perturbations (see [1], [2] and references therein). This model predicts DM density distribution $\rho(r) \sim r^{-\alpha}$ with $\alpha \simeq 1.8$ which holds from very small distances $r_{\rm min} \simeq 0.01~{\rm pc}$ up to very large distances $r_{\rm max} \simeq 5~{\rm Mpc}$. Assuming the neutralino to be a CDM particle, we calculate the annihilation of neutralinos in the vicinity of the singularity (Galactic Center). If neutralinos are the dominant component of DM in our Galaxy, the produced energy is enough to provide the whole observed activity of the GC. Neutralinos of the most general composition and of mass in the range 20~{\rm GeV} \leq m_\c \leq 1~{\rm TeV} are considered. We find the neutralino compositions which give the relic density needed for the Mixed Dark Matter (MDM) model and we evaluate for these compositions the high--energy ($E_{\gamma} > 100 ~{\rm MeV}$) gamma--ray flux under the constraint that the radio flux is lower than the observational limit. The compositions with the detectable gamma--ray flux which we found are provided by a set of almost pure gaugino states with the neutralino mass between $100$ and $500$ GeV. We demonstrate that a detectable high--energy gamma--ray flux is produced by the neutralino annihilation also in the case when neutralinos provide a small fraction (down to $0.1 \%$) of the DM in our Galaxy. The predicted flux is $F_\gamma \sim 10^{-7}-10^{-8}~{\rm cm}^{-2}~{\rm s}^{-1}$ for E_\gamma \gsim 300~{\rm MeV}Comment: Plain TeX 11 pages 4 figures available on request. Preprint numbers LNGS 94/90 - DFTT 5/9

Heavy quark potential and quarkonia dissociation rates

Quenched lattice data for the quark-antiquark interaction (in terms of heavy quark free energies) in the color singlet channel at finite temperatures are fitted and used within the nonrelativistic Schroedinger equation formalism to obtain binding energies and scattering phase shifts for the lowest eigenstates in the charmonium and bottomonium systems in a hot gluon plasma. The partial dissociation rate due to the Bhanot-Peskin process is calculated using different assumptions for the gluon distribution function, including free massless gluons, massive gluons, and massive damped gluons. It is demonstrated that a temperature dependent gluon mass has an essential influence on the heavy quarkonia dissociation, but that this process alone is insufficient to describe the heavy quarkonia dissociation rates.Comment: 4 pages, 5 figures, contribution to the proceedings of the International Conference on Hard and Electromagnetic Probes of High Energy Nuclear Collisions, Ericeira, Portugal, Nov. 4-10, 200

Heavy-quark Langevin dynamics and single-electron spectra in nucleus-nucleus collision

The stochastic dynamics of heavy quarks in the fireball produced in heavy-ion collisions is followed through numerical simulations based on the Langevin equation. The modification of the final p_T spectra (R_AA) of c and b quarks, hadrons and single-electrons with respect to pp collisions is studied. The transport coefficients are evaluated treating separately the contribution of soft and hard collisions. The initial heavy-quark spectra are generated according to NLO-pQCD, accounting for nuclear effects through recent nPDFs. The evolution of the medium is obtained from the output of two hydro-codes (ideal and viscous). The heavy-quark fragmentation into hadrons and their final semileptonic decays are implemented according to up to date experimental data. A comparison with RHIC data for non-photonic electron spectra is given.Comment: 4 pages, 3 figures, Talk given at "Hot Quarks 2010", 21th-26th June 201

e+e- --> e+e- pi0 pi0 at Daphne

The production of the sigma(500) meson in gamma gamma --> pi0 pi0 is studied. In particular, the KLOE data collected during the DAPHNE run at sqrt(s)= 1 GeV are appropriate to this purpose because of the strong reduction of Kaon backgrounds.Comment: 13 pages, 9 figures, few comments adde

BK from the lattice with Wilson quarks

We report our results for the bag-parameter BK obtained from the quenched simulations on the lattice with Wilson fermions at three values of the lattice spacing. We implemented the method by which no subtraction of the mixing with other four-fermion dS=2 operators is needed. Our final result, in terms of the renormalisation group invariant bag-parameter, is BK = 0.96 +/- 0.10.Comment: 12 pages, 3 figures [version published in Eur.Phys.J.C

Kualitas Program Salam TV terhadap Perilaku Generaasi Islami

The development of television (television programs) makes other television stations increasingly compete with each other to present the most interesting programs. The packaging of the event is done in such a way with the aim of attracting the hearts of the audience. Currently we watch a lot of TV about religious programs, soap operas and music. As a Muslim millennial generation, we must be smart about using the mass media because the media can play a role in shaping the morale of a nation in the form of information, education and social control in matters of morality and religion. Likewise with a TV station called Salam TV which also doesn't want to miss its programs. One way is to send a religious impression. The main goal is that the Salam TV religious program can provide more interesting Islamic information or learning, so that viewers can agree with the intent or purpose of the program in improving the quality of moral and religious messages through Salam TV stations. This study uses a qualitative method with a case study approach. The results of the study show that the salam tv program can have a big influence on the formation of the religious behavior of the Islamic generation. &nbsp

The Effect of Information Technology in Eradicating Poverty (Case Study: Punk Community in Medan City)

From year to year, the poverty rate in Indonesia is getting lower. However, reducing poverty is still far from the goals set by the government, such as the MDGs and the 2009–2014 RPJMN. The government needs a new approach to achieve its goal of alleviating poverty, not Information and communication technology is one method (ICT). ICT is considered to be able to evaluate poverty relief in many countries. The Technology Development Index can be used to track ICT growth. One of the main causes of the failure of poverty alleviation efforts in Indonesia is the lack of knowledge of the Indonesian people about technology management and their lack of access to information. Even in big cities, access to complete information and the latest technology is not evenly distributed, as evidenced by the buskers and beggars who still roam the roads (Rizky, et al., 2015: 133). The poverty rate in the city of Medan can increase because of the large punk community there. In theory, information and communication technology should be widely known in all fields (Argiati, 2010:60), but in practice, the urban poverty rate in Medan can increase due to the emergence of a large punk subculture with a poverty background. Therefore, it is interesting to conduct this research to find out how information and communication technology can reduce urban poverty, especially for the punk community in Medan. The lack of information and communication technology literacy also contributes to the creation of many marginalized groups. The purpose of this article is to: Describe the history of punk culture; and discuss how technology, knowledge, and communication can help the punk community fight urban poverty. This study uses a qualitative descriptive methodology. Medan City is the city where this research was conducted. In-depth interviews, documentation, and observation are the three methods used to obtain data

Inclusive Decays of Bottom Hadrons in New Formulation of Heavy Quark Effective Field Theory

We apply the new formulation of heavy quark effective field theory (HQEFT) to the inclusive decays of bottom hadrons. The long-term ambiguity of using heavy quark mass or heavy hadron mass for inclusive decays is clarified within the framework of the new formulation of HQEFT. The $1/m_b$ order corrections are absent and contributions from $1/m_b^2$ terms are calculated in detail. This enables us to reliably extract the important CKM matrix element $|V_{cb}|$ from the inclusive semileptonic decay rates. The resulting lifetime ratios $\tau(B^0_s)/\tau(B^0)$ and $\tau(\Lambda_b)/\tau(B^0)$ are found to well agree with the experimental data. We also calculate in detail the inclusive semileptonic branching ratios and the ratios of the $\tau$ and $\beta$ decay rates as well as the charm countings in the $B^0$, $B^0_s$ and $\Lambda_b$ systems. For $B^0$ decays, all the observables are found to be consistent with the experimental data. More precise data for the $B^0$ decays and further experimental measurements for the $B^0_s$ and $\Lambda_b$ systems will be very useful for testing the framework of new formulation of HQEFT at the level of higher order corrections.Comment: 20 pages, RevTex, 8 figures, 3 tables, revised version with `dressed heavy quark' being addressed, to be published in Int. J. Mod. Phys.

STRATEGI DALAM MERENCANAKAN KAMPANYE DAN POLITIK KOMUNIKASI PEMBANGUNAN

One of the most important aspects of a political communication strategy is winning votes. The purpose of this study is to find out the political communication strategies used by candidates to win votes. Political leadership that considers the welfare of all residents of a region is very important for regional leaders. It takes time and process to become a good leader. Leadership is the ability to persuade others to do something the leader voluntarily wants. Regional heads can function as political officials and lead government in their regions, leaders must have an understanding of organization and society. The steps that will be designed by the government and implemented by the regions will make a tremendous difference to the areas to the community-oriented public services that will be offered. Provision of public services for the benefit of its citizens is the responsibility of the government as an institution. In addition, the state is obliged to fulfill the basic needs and rights of every citizen and citizen