Recent results from NA61/SHINE

NA61/SHINE at the CERN SPS is a fixed-target experiment pursuing a rich physics program including measurements for heavy ion, neutrino and cosmic ray physics. The main goal of the strong interactions program is to study the properties of the onset of deconfinement and to search for the signatures of the critical point. In this contribution the latest NA61/SHINE results on particle spectra as well as on fluctuations and correlations from p+p, Be+Be, and Ar+Sc energy scans will be presented. The NA61 measurements will be compared with world data and with model predictions.Comment: Presented at Excited QCD 2017, Sintra, Portuga

NA61/SHINE results on fluctuations and correlations in p+p and Be+Be interactions at CERN SPS energies

The aim of the NA61/SHINE strong interaction program is to explore the phase diagram of strongly interacting matter. The main physics goals are the study of the onset of deconfinement and the search for the critical point of strongly interacting matter. These goals are pursued by performing a beam momentum (13$A$ - 158$A$ GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La) scan. This contribution presents results on transverse momentum and multiplicity fluctuations from the Be+Be and p+p energy scan. Also, results on two-particle correlations in pseudorapidity and azimuthal angle obtained in p+p interactions will be shown. The influence of conservation laws and resonance decays on multiplicity and chemical fluctuations of identified particles in p+p interactions will be discussed. Obtained results will be compared with data from other experiments and with model predictions.Comment: QM2015 pro

Latest results from the NA61/SHINE beam energy scan with p+p and Be+Be collisions

The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement by measurements of hadron production properties in proton-proton, proton-nucleus and nucleus-nucleus interactions in the CERN SPS energy range. This contribution presents results on the energy dependence of hadron spectra and yields as well as on fluctuations and two-particle correlations in p+p and centrality selected Be+Be collisions. In particular, the energy dependence of the signal of deconfinement, the "horn", observed in central Pb+Pb collisions is compared with the corresponding results from p+p interactions. Also string-hadronic models are tested using hadron spectra and fluctuations measured in p+p interactions. Results on fluctuations (multiplicity and transverse momentum) are presented as a function of the collision energy for Be+Be and p+p collisions in search for the critical point of strongly interacting matter.Comment: HEP2015 proceeding

Macroeconomic Regime Switches and Speculative Attacks

This paper explains a currency crisis as an outcome of a switch in how monetary policy and fiscal policy are coordinated. The paper develops a model of an open economy in which monetary policy starts active, fiscal policy starts passive and, in a particular state of nature, monetary policy switches to passive and fiscal policy switches to active. The probability of the regime switch is endogenous and changes over time together with the state of the economy. The regime switch is preceded by a sharp increase in interest rates and causes a jump in the exchange rate. The model predicts that currency composition of public debt affects dynamics of macroeconomic variables. Furthermore, the model is consistent with evidence from recent currency crises, in particular small seigniorage revenues.Coordination of monetary policy and fiscal policy, policy regime switch, currency crisis, speculative attack, fiscal theory of the price level

How much of the Macroeconomic Variation in Eastern Europe is Attributable to External Shocks?

We decompose by origin the sources of the variation in real aggregate output and aggregate price level in the Czech Republic, Hungary and Poland. We find that a sizable fraction of the variation is attributable to external shocks, especially so for aggregate price level. We show that euroarea interest rate shocks can account for a significant fraction of the external spillover effects. We conclude that theoretical models of advanced transition economies and policy rules for these economies should feature a prominent role for external shocks.Vector autoregression, Granger causal priority, transition economies, external shocks

External Shocks, U.S. Monetary Policy and Macroeconomic Fluctuations in Emerging Markets

Using structural VARs, I find that external shocks are an important source of macroeconomic fluctuations in emerging markets. Furthermore, U.S. monetary policy shocks affect quickly and strongly interest rates and the exchange rate in a typical emerging market. The price level and real output in a typical emerging market respond to U.S. monetary policy shocks by more than the price level and real output in the U.S. itself. These findings are consistent with the idea that “when the U.S. sneezes, emerging markets catch a cold.” At the same time, U.S. monetary policy shocks are not important for emerging markets relative to other kinds of external shocks.Structural vector autoregression, monetary policy shocks, international spillover effects of monetary policy, external shocks, emerging markets

Generalisation of the identity method for determination of high-order moments of multiplicity distributions with a software implementation

The incomplete particle identification limits the experimentally-available phase space region for identified particle analysis. This problem affects ongoing fluctuation and correlation studies including the search for the critical point of strongly interacting matter performed on SPS and RHIC accelerators. In this paper we provide a procedure to obtain $n$-th order moments of the multiplicity distribution using the identity method, generalising previously published solutions for $n=2$ and $n=3$. Moreover, we present an open source software implementation of this computation, called \textit{Idhim}, that allows one to obtain the true moments of identified particle multiplicity distributions from the measured ones provided the response function of the detector is known.Comment: Minor corrections to previous version. Plots exchange