Temat: hadrons - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Fitting a deep generative hadronization model
Autorzy:: Nachman, Benjamin
Siódmok, Andrzej
Sangli, Vishnu
Kania, Adam
Chan, Jay
Ju, Xiangyang
Opis:: Hadronization is a critical step in the simulation of high-energy particle and nuclear physics experiments. As there is no first principles understanding of this process, physically-inspired hadronization models have a large number of parameters that are fit to data. Deep generative models are a natural replacement for classical techniques, since they are more flexible and may be able to improve the overall precision. Proof of principle studies have shown how to use neural networks to emulate specific hadronization when trained using the inputs and outputs of classical methods. However, these approaches will not work with data, where we do not have a matching between observed hadrons and partons. In this paper, we develop a protocol for fitting a deep generative hadronization model in a realistic setting, where we only have access to a set of hadrons in data. Our approach uses a variation of a Generative Adversarial Network with a permutation invariant discriminator. We find that this setup is able to match the hadronization model in Herwig with multiple sets of parameters. This work represents a significant step forward in a longer term program to develop, train, and integrate machine learning-based hadronization models into parton shower Monte Carlo programs.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: Systematic study of directed flow at RHIC energies
Autorzy:: Mignerey, A.
Tematy:: relativistic heavy ions
directed flow
PHOBOS
charged hadrons; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/148368.pdf Link otwiera się w nowym oknie
Opis:: Directed flow, v1, of charged hadrons has been measured in Au-Au collisions at RHIC for center-of-mass energies square root(sNN) = 19.6, 130, 62.4, and 200 GeV using the PHOBOS detector. The large acceptance of PHOBOS for charged particles allows measurements over the full range of pseudorapidity |eta| < 5.4. The results for a symmetric subevent method are shown at all four energies. Comparison is made to a mixed harmonic method for the highest energy, and compared to similar results from the STAR collaboration.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Ostatnie doniesienia z Cernu
The Latest News from CERN
Autorzy:: Nowina-Konopka, M.
Tematy:: Model Standardowy
LHC
hadrony
bariony
mezony
Standard Model
hadrons
barions
mesons; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/214150.pdf Link otwiera się w nowym oknie
Opis:: Główne cele projektu LHC: odkrycie bozonu Higgsa, badania antymaterii i plazmy kwarkowo – gluonowej osiągnęły etap coraz bardziej subtelnej analizy danych. Są poszukiwane nowe cząstki oraz zjawiska świadczące o istnieniu „nowej fizyki” wykraczającej poza Model Standardowy. Są planowane nowe eksperymenty, pozwalające na uzyskanie jeszcze wyższych energii niż w LHC. Zarówno w pomysłach na nowe eksperymenty, jak i w interpretacji danych Polacy mają spore sukcesy.
The main goals of the LHC project: the discovery of the Higgs boson, the study of antimatter and quark – gluon plasma have reached the stage of increasingly subtle data analysis. New particles and phenomena are being sought that testify to the existence of a “new physics” that goes beyond the Standard Model. New experiments are planned to allow for even higher energy than in the LHC. Both in ideas for new experiments and in the interpretation of data, Poles are quite successful.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Determination of $N^{\ast }$ amplitudes from associated strangeness production in p+p collisions
Autorzy:: Epple, E.
Herrmann, N.
Koczon, P.
Yamasaki, T.
Suzuki, K.
Kiš, M.
Matulewicz, T.
Münzer, R.
Ryu, M. S.
Wiśniewski, K.
Grzonka, D.
Gasik, P.
Čaplar, R.
Lu, S.
Reischl, A.
Wagner, P.
Gašparić, I.
Liu, J. L.
Buehler, P.
Clement, H.
Zmeskal, J.
Lebedev, A.
Kotte, R.
Roderburg, E.
Piasecki, K.
Cargnelli, M.
Hartmann, O. N.
Seres, Z.
Wintz, P.
Sarantsev, A.
Marton, J.
Kecskemeti, J.
Smolyankin, V.
Ritman, J.
Rami, F.
Weber, I.
Xiao, Z. G.
Zinyuk, V.
Sim, K. S.
Gillitzer, A.
Kang, T.I.
Fabbietti, L.
Leifels, Y.
Klose, P.
Hildenbrand, K. D.
Deppner, I.
Kim, Y. J.
Le Fèvre, A.
Manko, V.
Widmann, E.
Kirejczyk, M.
Pleiner, D.
Zhang, Y.
Salabura, Piotr
Fodor, Z.
Czerwiakowa, O.
Basrak, Z.
Grishkin, Y.
Ramstein, B.
Schmidt, P.
Eyrich, W.
Hong, B.
Yushmanov, I.
Dželalija, M.
Tymiński, Z.
Siwek-Wilczyńska, K.
Zhilin, A.
Maggiora, M.
Sikora, B.
Hauenstein, F.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 5.

Tytuł:: Scale setting and the light baryon spectrum in N$_{f}$ = 2 + 1 QCD with Wilson fermions
Autorzy:: Collins, Sara
Korcyl, Piotr
Weishäupl, Simon
Söldner, Wolfgang
Scholz, Enno E.
Bali, Gunnar
Georg, Peter
Jenkins, Daniel
Schäfer, Andreas
Simeth, Jakob
Opis:: We determine the light baryon spectrum on ensembles generated by the Coordinated Lattice Simulations (CLS) effort, employing N$_{f}$ = 2 + 1 flavours of non-perturbatively improved Wilson fermions. The hadron masses are interpolated and extrapolated within the quark mass plane, utilizing three distinct trajectories, two of which intersect close to the physical quark mass point and the third one approaching the SU(3) chiral limit. The results are extrapolated to the continuum limit, utilizing six different lattice spacings ranging from a ≈ 0.10 fm down to below 0.04 fm. The light pion mass varies from Mπ ≈ 429 MeV down to 127 MeV. In general, the spatial extent is kept larger than four times the inverse pion mass and larger than 2.3 fm, with additional small and large volume ensembles to investigate finite size effects. We determine the Wilson flow scales $\sqrt{t_{0,ph}}$ = 0.1449$_{(9)}^{(7)}$ fm [1] and t$_{0}^{*}$ ≈ t$_{0,ph}$ [2] from the octet cascade ($\Xi$ baryon). Determining the light baryon spectrum in the continuum limit, we find the nucleon mass m$_{N}$ = 941.7$_{(7.6)}^{(6.5)}$ MeV and the other stable baryon masses to agree with their experimental values within sub-percent level uncertainties. Moreover, we determine SU(3) and SU(2) chiral perturbation theory low energy constants, including the octet and the $\Omega$ baryon sigma terms $\sigma_{\pi N}$ = 43.9(4.7) MeV, $\sigma_{\pi \Lambda}$ = 28.2$_{(5.4)}^{(4.3)}$ MeV, $\sigma_{\pi \Sigma}$ = 25.9$_{(6.1)}^{(3.8)}$ MeV, $\sigma_{\pi \Xi}$ = 11.2$_{(6.4)}^{(4.5)}$ MeV and $\sigma_{\pi \Omega}$ = 6.9$_{(4.3)}^{(5.3)}$ MeV, as well as various parameters, renormalization factors and improvement coefficients that are relevant for simulations with our lattice action.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 6.

Tytuł:: A measurement of material in the ATLAS tracker using secondary hadronic interactions in 7 TeV $\mathit{pp}$ collisions
Autorzy:: Pałka, Marek
Richter-Wąs, Elżbieta
Współwytwórcy:: Współautorami artykułu są członkowie ATLAS Collaboration w liczbie 2857
Opis:: nowledge of the material in the ATLAS inner tracking detector is crucial in understanding the reconstruction of charged-particle tracks, the performance of algorithms that identify jets containing b-hadrons and is also essential to reduce background in searches for exotic particles that can decay within the inner detector volume. Interactions of primary hadrons produced in pp collisions with the material in the inner detector are used to map the location and amount of this material. The hadronic interactions of primary particles may result in secondary vertices, which in this analysis are reconstructed by an inclusive vertex-finding algorithm. Data were collected using minimum-bias triggers by the ATLAS detector operating at the LHC during 2010 at centre-of-mass energy $\sqrt{s}$ = 7 TeV, and correspond to an integrated luminosity of 19 nb$^{−1}$. Kinematic properties of these secondary vertices are used to study the validity of the modelling of hadronic interactions in simulation. Secondary-vertex yields are compared between data and simulation over a volume of about 0.7 m$^{3}$ around the interaction point, and agreement is found within overall uncertainties.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 7.

Tytuł:: Study of the material of the ATLAS inner detector for Run 2 of the LHC
Autorzy:: Pałka, Marek
Richter-Wąs, Elżbieta
Współwytwórcy:: Współautorami artykułu są członkowie ATLAS Collaboration w liczbie 2867
Opis:: The ATLAS inner detector comprises three different sub-detectors: the pixel detector, the silicon strip tracker, and the transition-radiation drift-tube tracker. The Insertable B-Layer, a new innermost pixel layer, was installed during the shutdown period in 2014, together with modifications to the layout of the cables and support structures of the existing pixel detector. The material in the inner detector is studied with several methods, using a low-luminosity $\sqrt{s}$ = 13 TeV pp collision sample corresponding to around 2.0 nb$^{−1}$ collected in 2015 with the ATLAS experiment at the LHC. In this paper, the material within the innermost barrel region is studied using reconstructed hadronic interaction and photon conversion vertices. For the forward rapidity region, the material is probed by a measurement of the efficiency with which single tracks reconstructed from pixel detector hits alone can be extended with hits on the track in the strip layers. The results of these studies have been taken into account in an improved description of the material in the ATLAS inner detector simulation, resulting in a reduction in the uncertainties associated with the charged-particle reconstruction efficiency determined from simulation.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 8.

Tytuł:: International Linear Collider Global and Local Implications
Autorzy:: Romaniuk, R. S.
Tematy:: ILC
ILC-GDE
LCC
SRF
accelerators
particle colliders
linacs
superconductivity
high energy physics experiments
elementary particles
hadrons
electron beams
positron beams
microwave resonant cavities
high power 1,3 GHz systems
superconducting RF electronics; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/226596.pdf Link otwiera się w nowym oknie
Opis:: ILC machine–International Liner Collider, is one of two accelerators e+e-just under design and advanced consideration to be built with final energy of colliding electron and positron beams over 1 TeV. An alternative project to ILC is CLIC in CERN The ILC machine is an important complementary addition for the research potential of the LHC accelerator complex. The required length of ILC is minimally 30 km, but some versions of the TDR estimates mention nearly 50km. Superconducting RF linacs will be built using well established 1,3 GHz TESLA technology using ultrapure niobium or Nb3Sn resonant microwave cavities of RRR class, of ultimate finesse, working with gradients over 35MV/m, while some versions of the design mention ultimate confinement as high as 50MV/m. Several teams from Poland (Kraków. Warszawa, Wrocław – IFJ-PAN, AGH, UJ, NCBJ, UW, PW, PWr, INT-PAN) participate in the global design effort for this machine – including detectors, cryogenics, and SRF systems. Now it seems that the ILC machine will be built in Japan, during the period of 2016-2026. If true, Japan will turn to a world super-power in accelerator technology no.3 after CERN and USA. The paper summarizes the state-of-the-art of technical and administration activities around the immense ILC and CLIC machines, with emphasis on potential participation of Polish teams in the global effort of newly established LCC –The Linear Collider Consortium.
Dostawca treści:: Biblioteka Nauki

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