Measurement of Direct CP Asymmetries in Charmless Hadronic B Decays

We present recent results on time integrated and time dependent CP violation for charmless hadronic B decays using BABAR detector at the PEP-II B-factory.Comment: 7 pages, 3 postscript figues, contributed to the Proceedings of ICHEP200

Stochastic Geometry Modeling and Performance Evaluation of mmWave Cellular Communications

In this paper, a new mathematical framework to the analysis of millimeter wave cellular networks is introduced. Its peculiarity lies in considering realistic path-loss and blockage models, which are derived from experimental data recently reported in the literature. The path-loss model accounts for different distributions for line-of-sight and non-line-of-sight propagation conditions and the blockage model includes an outage state that provides a better representation of the outage possibilities of millimeter wave communications. By modeling the locations of the base stations as points of a Poisson point process and by relying upon a noise-limited approximation for typical millimeter wave network deployments, exact integral expressions for computing the coverage probability and the average rate are obtained. With the aid of Monte Carlo simulations, the noise-limited approximation is shown to be sufficiently accurate for typical network densities. Furthermore, it is shown that sufficiently dense millimeter wave cellular networks are capable of outperforming micro wave cellular networks, both in terms of coverage probability and average rate.Comment: Presented at 2015 IEEE International Conference on Communications (ICC), London, UK (June 2015). arXiv admin note: substantial text overlap with arXiv:1410.357

Inclusive and differential W and Z at CMS and ATLAS

Several electroweak precision measurements are performed by the ATLAS and CMS collaborations at the LHC. The main ones are carried out using Drell-Yan production of single W and Z boson. They regard the measurement of the production cross sections of W and Z bosons, the mass of the W boson, and $\sin^2\theta_W$. The results of the $\sin^2\theta_W$ measurements have an accuracy of approximately twice that reached at LEP and SLD. Other measurements reported are about the Drell-Yan differential production cross section.Comment: Contribution to the 2019 QCD session of the 54th Rencontres de Morion

Lyth Bound, eternal inflation and future cosmological missions

In this paper we provide a new expression for the variation of the inflaton field $\Delta\phi$ during the horizon crossing epoch in the context of single field slow roll inflationary models. Such an expression represents a generalization of the well-know Lyth bound. We also explore the consequences of a detection of permille order of the tensor-to-scalar ratio amplitude, $r$, as well as an improvement on the estimation of the scalar spectral index, $n_s$ and its running $\alpha_s$, by the upcoming CMB polarization experiments that will provide plausible constraints on the quantity $\Delta\phi$ during the horizon exit moment. In addition we discuss the relation between the local variation of the field and the possibilities of an eternal inflation. The results of the analysis are completely model independent.Comment: 9 pages, 5 figures, some typos correcte

Sweet Talk: A Theory of Persuasion

This paper introduces a model of sweet talk in which a seller may acquire verifiable information and selectively disclose it to a buyer to negotiate a deal. We start by analyzing a model with common priors in which the seller generates information for two reasons: a trading motive and a profit motive that is, to make trade possible or to increase the gains from it. There exists a negotiation region in which the seller continues to reveal information even if trading is already profitable. We extend the model, allowing for different prior beliefs about the value of the object, arguing that a complementarity between the seller's confidence and the precision of his information endogenously arises. Appointing an optimistic salesman may be costly because he may destroy profitable trading opportunities. We also allow the seller to choose in which market to trade: a matching market with a fixed price or a haggling market. Our model also provides a testable difference between a model of trading with homogenous priors and one with heterogeneous priors and finds application in understanding contracts as reference points.persuasion games; haggling; negotiation; bargaining; heterogeneous priors, overconfidence, consummate and perfunctory performance, verifiable information.

Information sharing in emerging credit markets

This paper examines the lack of information flow in the credit markets of developing countries. We show that the miscoordination among financial intermediaries might explain why lenders don't share their information about the borrowers. The competition effect of more transparency in the market leads to a higher probability of default of the firm, also generating credit rationing.Coordination.

Competitive balance and TV audience: An empirical analysis on the Italian Serie A

This paper investigates the behaviour of the “couch potato” audience in regards to the Italian Football League - Serie A - during the 2008/09 season. Using data from 380 matches, we considered a collection of variables suitable to influence the share of TV audience of satellite television. According to the standard prescriptions of sports economics literature and assessing peculiarities of Italian context, we estimated the “Football on TV’s” demand by an OLS regression model. Rating the dependent variable of TV audience by the share registered in each match, we introduced a set of independent variables in order to approximate match quality, the programme schedule placement, the follow-up of the involved teams and their rank. As other theoretical and empirical investigations have focused on Spanish and English championships, our attention concentrates particularly on the relationship between the closeness of the game and the television audience. In the regression model, uncertainty of outcome has been measured extracting information from the Italian fixed odds betting market. We found that all the theoretical expected relationships have been confirmed by the econometric analysis. In spite of the statistical significance of the outcome uncertainty on share, the estimation points out that more then 90% of variability concerning TV audience has been explained net of uncertainty factors and that the impact of a closest context on dependent variable is marginal. The overestimation of the role of match uncertainty on TV audience could support the opinion of top team’s management opposing the return to the collective bargaining of TV rights starting from next season, 2010/11, fixed by the law 9/2008 of Italian Parliament. In football context the competitive balance should then be considered a “meritorius good”, far from market assessment.

Win the best, win the largest or win the richest. Some empirical evidence from Italian championships

This paper uses an econometric model to evaluate the impact of variables influencing the long period competitive balance in Italian football league. Using records of the last 75 tournaments and adopting as a measure of market size both a demand and a supply side perspective, the paper aims at establishing if the theoretical prescriptions on the long run competitive balance holds for the Italian championships. This approach allows us to evaluate if teams outperform their market size and to extract a ranking of the best and worst teams in the last 75 years.

Accountability and Cheap Talk

This paper analyzes a cheap talk model with heterogeneous receivers who are accountable for the correctness of their actions, showing that there exists a truth-revealing equilibrium. This sheds new light on the important role played by elections in shaping politicians' and, more surprisingly, advisor's behaviors in a cheap-talk setting. In deciding which message to send, the advisor is aware that he could use this message to affect the electoral outcome, the manipulation effect, or to shape the first period policy, the influence effect. When the first effect dominates the second there exists an informative equilibrium. In addition, I show that the presence of heterogeneous politicians leads to an increase in voters' welfare as a result of better-informed decisions. I allow the politician to delegate authority to the expert, showing that due to the signaling value of the politician's delegation decision, only corrupt or incompetent incumbents will delegate the second-period decision. Finally, I generalize the results in a number of different directions.cheap talk, corruption, reputation, ideology.