Di-muon measurements with the CBM experiment at FAIR

Kiseleva, A.; Bhaduri, Partha Pratim; Chattopadhyay, Subhasis; Dubey, A. K.; Ganti, M. S.; Ghosh, P.; Hoehne, C.; Senger, P.; Vassiliev, I.; Khanzadeev, A.; Kryshen, E.; Nikulin, V.; Samsonov, V.; Ryzhinskiy, M. M.

doi:10.1007/s12648-011-0043-5

Cited by 11 publications

(5 citation statements)

References 8 publications

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“…However, due to the fact that the MAID neutron parametrization has relatively large systematic uncertainty [9], we want to stress 1 that the red curves should only be taken with a grain of salt. Time-like FFs are shown in [11]. In our dispersive framework, the only quantitative inputs are the S and D-wave Γ Nρ decay widths together with the hadronic two-body decay widths from N * (1520) → N π, ∆π, which are the sources of uncertainties for our dispersive calculations.…”

Section: Preliminary Results and Outlookmentioning

confidence: 99%

N*(1520) transition form factors from dispersion theory

2024

EPJ Web Conf.

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The electromagnetic transition form factors (TFFs) of the nucleon provide important information on the internal structure of hadrons. A model-independent dispersive calculation of the electro magnetic TFFs N*(1520) → N at low energies is presented. Taking pion rescattering into consideration, we derived dispersive relations for the N*(1520) → N TFFs that relate space-like and time-like regions from the first principles. Based on the space-like data from JLab and hadronic data measured by HADES, we make predictions for TFFs in the time-like region. Our predictions can be tested in future experi ments (e.g. HADES).

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Section: Preliminary Results and Outlookmentioning

confidence: 99%

N*(1520) transition form factors from dispersion theory

2024

EPJ Web Conf.

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“…One objective of the experiment is the measurement of J/ψ meson production via their decay into a muon pair (J/ψ → µ + µ − ). At CBM energies, however, the J/ψ multiplicity is expected to be extremely small -of the order of 10 −7 per collision [16]. The experiment will thus be operated at extreme interaction rates in order to obtain sufficient statistics.…”

Section: The Cbm Experiments and Its Muon Detection Systemmentioning

confidence: 99%

Investigation of heterogeneous computing platforms for real-time data analysis in the CBM experiment

Singhal

Chattopadhyay

Friese

2020

Computer Physics Communications

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Draft 14, 14 August 2019Future experiments in high-energy physics will pose stringent requirements to computing, in particular to real-time data processing. As an example, the CBM experiment at FAIR Germany intends to perform online data selection exclusively in software, without using any hardware trigger, at extreme interaction rates of up to 10 MHz. In this article, we describe how heterogeneous computing platforms, Graphical Processing Units (GPUs) and CPUs, can be used to solve the associated computing problems on the example of the first-level event selection process sensitive to J/ψ decays using muon detectors. We investigate and compare pure parallel computing paradigms (Posix Thread, OpenMP, MPI) and heterogeneous parallel computing paradigms (CUDA, OpenCL) on both CPU and GPU architectures and demonstrate that the problem under consideration can be accommodated with a moderate deployment of hardware resources, provided their compute power is made optimal use of. In addition, we compare OpenCL and pure parallel computing paradigms on CPUs and show that OpenCL can be considered as a single parallel paradigm for all hardware resources.

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“…The charmonium produced at an early stage of the collision is believed to be a penetrating probe for characterization of the confining status of the dense baryonic medium. The experimental program thus includes a detailed proposal to study the production of the hidden charm hadrons, through their decay into lepton pairs [15], by high intensity beams. The di-leptons are not affected by the strong interactions that reign during hadronization and carry undistorted images of the earlier phases.…”

Section: Introductionmentioning

confidence: 99%

J/Psi production in proton induced collisions at FAIR

Bhaduri,

Chaudhuri,

Chattopadhyay

2011

Preprint

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We have examined the production of J/ψ mesons in high energy proton-proton and proton-nucleus collisions at beam energies in the range from 158 GeV to 920 GeV, available from different fixed target experiments. In the employed model J/ψ production in hadronic collisions is assumed to be a factorisable two step process: (i) production of a cc pair which can be reliably described by perturbative QCD, and (ii) formation of J/ψ resonance from the cc pair, which can be conveniently parameterized incorporating different existing physical mechanisms of color neutralization. We show that, for lower collision energies, J/ψ production through quark-anti-quark annihilation gives larger contribution at higher xF , while gluon-gluon fusion dominates the production at smaller xF . For proton-nucleus collisions the model takes into account both the initial state modification of parton distributions in nuclei and the final state interaction of the produced cc pairs with the target nucleons. The model is found to give reasonable description of data on J/ψ production in protonic and proton-nucleus collisions, for different existing fixed target experiments. In case of proton-nucleus collisions, our calculations show a non-negligible dependence of the final state nuclear dissociation of J/ψ mesons on the energy of the incident proton beam. The model has been applied to predict the J/ψ production and suppression expected in proton-nucleus collisions at energies relevant to FAIR, the upcoming accelerator facility at Darmstadt, Germany. The amount of suppressions, for different mechanisms of J/ψ hadronization has been found to be distinguishably different which might help an experimental settlement of the much controversial issue of color neutralization.

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Di-muon measurements with the CBM experiment at FAIR

Cited by 11 publications

References 8 publications

N*(1520) transition form factors from dispersion theory

N*(1520) transition form factors from dispersion theory

Investigation of heterogeneous computing platforms for real-time data analysis in the CBM experiment

J/Psi production in proton induced collisions at FAIR

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