916 research outputs found

    Semi-Inclusive Distributions in Statistical Models

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    The semi-inclusive properties of the system of neutral and charged particles with net charge equal to zero are considered in the grand canonical, canonical and micro-canonical ensembles as well as in micro-canonical ensemble with scaling volume fluctuations. Distributions of neutral particle multiplicity and charged particle momentum are calculated as a function of the number of charged particles. Different statistical ensembles lead to qualitatively different dependencies. They are being compared with the corresponding experimental data on multi-hadron production in p+pp+p interactions at high energies.Comment: Two subsections are added: "Average multiplicities, fluctuations and correlations" and "Quantum statistics

    Resonances in a sudden chemical freeze-out model

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    The prediction for pTp_T spectra of various resonances produced in Pb+Pb collisions at 2.76 TeV at the LHC in equilibrium and non-equilibrium models is made. It includes the η\eta, ρ\rho(770), Σ\Sigma(1385), Λ\Lambda(1520), and Ξ\Xi(1530). The apparent differences may allow to distinguish between the models.Comment: Minor changes on the request of a refere

    Efficacy of high-risk human papillomavirus genotype testing as cervical cancer screening method in a tertiary hospital of Dhaka, Bangladesh

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    Background: The fourth most frequent gynecological malignancy worldwide is cervical cancer. Due to the high incidence of risk factors, cervical cancer is a pressing concern in Bangladesh. One of the most prevalent sexually transmitted viruses that can be chronic and can result in cervical cancer is the human papillomavirus (HPV). Investigating the epidemiology and clinical traits of this specific kind of HPV requires the identification of the high-risk (HR) HPV type. The aim of the study is to find out High risk HPV genotype (16, 18, and others) distribution among asymptomatic women and compare the diagnostic performance between the test of HR-HPV and visual inspection of cervix with acetic acid. Methods: This cross sectional study was carried out in the Department of Gynecological Oncology, Bangabandhu Sheikh Mujib Medical University, Dhaka. A total of 300 asymptomatic women, aged 30 to 60 years, fulfilling inclusion criteria were included in this study. Study data was collected by a structured questionnaire designed for interview, clinical examination, HR-HPV genotyping, visual inspection of the cervix with acetic acid (VIA), and colposcopy of the women. HR-HPV genotyping was performed by a reverse transcriptase polymerase chain reaction. Results: Among all of the HPV genotypes, HPV 16 (4.7%) was the most prevalent type, followed by HR-HPV (3.7%), HPV 18 (0.7%), and a combination of HPV 16 and other HR-HPV (0.3%). Conclusions: HPV genotype can be used as an effective method for cervical cancer screening, including the identification of women at risk of cervical cancer.

    Particle Number Fluctuations in Statistical Model with Exact Charge Conservation Laws

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    Even though the first momenta i.e. the ensemble average quantities in canonical ensemble (CE) give the grand canonical (GC) results in large multiplicity limit, the fluctuations involving second moments do not respect this asymptotic behaviour. Instead, the asymptotics are strikingly different, giving a new handle in study of statistical particle number fluctuations in relativistic nuclear reactions. Here we study the analytical large volume asymptotics to general case of multispecies hadron gas carrying fixed baryon number, strangeness and electric charge. By means of Monte Carlo simulations we have also studied the general multiplicity probability distributions taking into account the decay chains of resonance states.Comment: 4 pages, 2 figures. The report of the talk given in Strangeness in Quark Matter 2004, Cape Town. Submitted to J. Phys. G: Nucl. Part. Phy

    Particle Number Fluctuations in Relativistic Bose and Fermi Gases

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    Particle number fluctuations are studied in relativistic Bose and Fermi gases. The calculations are done within both the grand canonical and canonical ensemble. The fluctuations in the canonical ensemble are found to be different from those in the grand canonical one. Effects of quantum statistics increase in the grand canonical ensemble for large chemical potential. This is, however, not the case in the canonical ensemble. In the limit of large charge density a strongest difference between the grand canonical and canonical ensemble results is observed.Comment: 13 pages, 6 figure

    Multiplicity Distributions in Canonical and Microcanonical Statistical Ensembles

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    The aim of this paper is to introduce a new technique for calculation of observables, in particular multiplicity distributions, in various statistical ensembles at finite volume. The method is based on Fourier analysis of the grand canonical partition function. Taylor expansion of the generating function is used to separate contributions to the partition function in their power in volume. We employ Laplace's asymptotic expansion to show that any equilibrium distribution of multiplicity, charge, energy, etc. tends to a multivariate normal distribution in the thermodynamic limit. Gram-Charlier expansion allows additionally for calculation of finite volume corrections. Analytical formulas are presented for inclusion of resonance decay and finite acceptance effects directly into the system partition function. This paper consolidates and extends previously published results of current investigation into properties of statistical ensembles.Comment: 53 pages, 7 figure
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