Tue·Jul 11, 2023Tuesday·July 11, 2023

1. 01*

   Transverse momentum dependent feed-down fractions for bottomonium production

   Jacob Boyd🇺🇸 · Sabin Thapa🇺🇸 · Michael Strickland🇺🇸

   We extract transverse momentum dependent feed-down fractions for bottomonium production using a data-driven approach. We use data published by the ATLAS, CMS, and LHCb Collaborations for sqrt(s) = 7 TeV proton-proton collisions. Based on this collected data, we produce fits to the differential cross sections for the production of both S- and P-wave bottomonium states. Combining these fits with branching ratios for excited state decays from the Particle Data Group, we compute the feed-down fractions for both the Upsilon(1S) and Upsilon(2S) as a function of transverse momentum. Our results indicate a strong dependence on transverse momentum, which is consistent with prior extractions of the feed-down fractions. When evaluated at the average momentum of the states, we find that approximately 75% of Upsilon(1S) and Upsilon(2S) states are produced directly. Our results for the transverse momentum dependent feed-down fractions are provided in tabulated form so that they can be used by other research groups.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2023)·6 citations
2. 02*

   The Performance of AC-coupled Strip LGAD developed by IHEP

   Weiyi Sun · Mengzhao Li · Zhijun Liang · Mei Zhao · Xiaoxu Zhang · Tianyuan Zhang · Yuan Feng · Shuqi Li · Xinhui Huang · Yunyun Fan · Tianya Wu · Xuan Yang and 4 other authors

   The AC-coupled Strip LGAD (Strip AC-LGAD) is a novel LGAD design that diminishes the density of readout electronics through the use of strip electrodes, enabling the simultaneous measurement of time and spatial information. The Institute of High Energy Physics has designed a long Strip AC-LGAD prototype with a strip electrode length of 5.7 mm and pitches of 150 $\mu m$, 200 $\mu m$, and 250 $\mu m$. Spatial and timing resolutions of the long Strip AC-LGAD are studied by pico-second laser test and beta source tests. The laser test demonstrates that spatial resolution improves as the pitch size decreases, with an optimal resolution achieved at 8.3 $\mu$m. Furthermore, the Beta source test yields a timing resolution of 37.6 ps.

   ↳ physics.ins-dethep-exnucl-ex1 citation
3. 03*

   Probe of soft-QCD in minimum bias events of pp collisions with the ATLAS at the LHC

   Yuri A. Kulchitsky🇷🇺

   The study of the minimum-bias charged-particle distributions is reviewed. The data are obtained using the ATLAS detector at the LHC in proton-proton collisions at the centre-of-mass energies from 0.9 to13 TeV. The particles are required to have an absolute pseudorapidity less than 2.5. For charged-particle distributions study two transverse momentum thresholds cases, greater than 100 MeV and 500 MeV were taken. The charged-particle multiplicity, its dependence on the transverse momentum and pseudorapidity, dependence of the average transverse momentum on the charged-particle multiplicity and the KNO-scaling study are presented. The measured distributions are compared with the predictions of various tunings of Monte Carlo generator, which implement different minimum-bias models.The Monte Carlo model predictions qualitatively describe the data well, but with some significant discrepancies. Measurements of minimum-bias events by the ALICE and CMS Collaborations are presented.

   ↳ hep-exnucl-ex0 citations
4. 04*

   Symmetry energy and neutron star properties constrained by chiral effective field theory calculations

   Yeunhwan Lim🇰🇷 · Achim Schwenk🇩🇪

   We investigate the nuclear symmetry energy and neutron star properties using a Bayesian analysis based on constraints from different chiral effective field theory calculations using new energy density functionals that allow for large variations at high densities. Constraints at high densities are included from observations of GW170817 and from NICER. In particular, we show that both NICER analyses lead to very similar posterior results for the symmetry energy and neutron star properties when folded into our equation-of-state framework. Using the posteriors, we provide results for the symmetry energy and the slope parameter, as well as for the proton fraction, the speed of sound, and the central density in neutron stars. Moreover, we explore correlations of neutron star radii with the pressure and the speed of sound in neutron stars. Our 95\% credibility ranges for the symmetry energy $S_v$, the slope parameter $L$, and the radius of a 1.4$\text{msun}$ neutron star, $R_{1.4}$, are $S_v=(30.6\text{–}33.9)$\,MeV, $L=(43.7\text{–}70.0)$\,MeV, and $R_{1.4}=(11.6\text{–}13.2)$\,km. Our analysis for the proton fraction shows that larger and/or heavier neutron stars are more likely to cool rapidly via the direct Urca process. Within our equation-of-state framework a maximum mass of neutron stars $M_{\max }>2.1\text{msun}$ indicates that the speed of sound needs to exceed the conformal limit.

   ↳ nucl-thastro-ph.HEnucl-exPRC(2024)·33 citations
5. 05*

   Characterization of a novel proton-CT scanner based on Silicon and LaBr${}_3$(Ce) detectors

   E. Nácher🇪🇸 · J.A. Briz🇨🇭 · A.N. Nerio · A. Perea🇪🇸 · V.G. Távora · O. Tengblad🇪🇸 · M. Ciemala🇵🇱 · N. Cieplicka-Orynczak🇵🇱 · A. Maj🇵🇱 · K. Mazurek🇵🇱 · P. Olko · M. Zieblinski🇵🇱 · M.J.G. Borge🇪🇸

   Treatment planning systems at proton-therapy centres generally use X-ray computed tomography (CT) as primary imaging technique to infer the proton treatment doses to tumour and healthy tissues. However, proton stopping powers in the body, as derived from X-ray images, suffer from important proton-range uncertainties. In order to reduce this uncertainty in range, one could use proton-CT images instead. The main goal of this work is to test the capabilities of a newly-developed proton-CT scanner, based on the use of a set of tracking detectors and a high energy resolution scintillator for the residual energy of the protons. Different custom-made phantoms were positioned at the field of view of the scanner and were irradiated with protons at the CCB proton-therapy center in Krakow. We measured with the phantoms at different angles and produced sinograms that were used to obtain reconstructed images by Filtered Back-Projection (FBP). The obtained images were used to determine the capabilities of our scanner in terms of spatial resolution and proton Relative Stopping Power mapping and validate its use as proton-CT scanner. The results show that the scanner can produce medium-high quality images, with spatial resolution better than 2 mm in radiography, below 3 mm in tomography and resolving power in the RSP comparable to other state of the art pCT cameras.

   ↳ physics.med-phnucl-exphysics.ins-detEur.Phys.J.Plus(2024)·0 citations
6. 06*

   Diffusion and fluctuations of open charmed hadrons in an interacting hadronic medium

   Kangkan Goswami🇮🇳 · Kshitish Kumar Pradhan🇮🇳 · Dushmanta Sahu🇮🇳 · Raghunath Sahoo🇮🇳

   Heavy quarks are excellent probes to understand the hot and dense medium formed in ultra-relativistic collisions. In a hadronic medium, studying the transport properties, e.g. the drag ($\gamma$), momentum diffusion ($B_0$), and spatial diffusion ($D_s$) coefficients of open charmed hadrons can provide useful information about the medium. Moreover, the fluctuations of charmed hadrons can help us to locate the onset of their deconfinement. In this work, we incorporate attractive and repulsive interactions in the well-established van der Waals hadron resonance gas model (VDWHRG) and study the diffusion and fluctuations of charmed hadrons. This study helps us understand the importance of interactions in the system, which affect both the diffusion and fluctuations of charmed hadrons.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2023)·14 citations
7. 07*

   On the experimental description of neutron resonances

   Julien Gibelin🇫🇷

   We present a collection of simple derivations for the neutron-induced resonance cross-sections. These formulae are commonly used to experimentally describe the fundamental properties of resonances for neutron-rich nuclei far from stability and to describe unbound nuclei. The main goal of this article is to illustrate their dependencies with basic observables in order to discuss the pertinence of experimental approaches in the derivation of their properties, especially for "N-body" resonances.

   ↳ nucl-thnucl-exFew Body Syst.(2023)·1 citation
8. 08*

   A new Machine Learning-based method for identification of time-correlated events at tagged photon facilities

   V. Sokhoyan🇩🇪 · E. Mornacchi🇩🇪

   We present a new Machine Learning-based multivariate analysis method for the selection of time-correlated hits in the tagging system and devices used to detect particles in the final state at the bremsstrahlung-based tagged photon facilities. This method can be applied instead of the widely used sampling and subtraction of the time-uncorrelated background, in particular at experiments aiming for high precision, where the subtraction of the time-uncorrelated background leads to increased uncertainties. Moreover, the identification of events with Machine Learning algorithms allows to preserve the information about correlations of kinematic variables in the final state, which can be advantageous for further phenomenological analyses of the experimental results.

   ↳ physics.data-annucl-exJINST(2023)·0 citations
9. 09*

   Comparison of Point Cloud and Image-based Models for Calorimeter Fast Simulation

   Fernando Torales Acosta🇺🇸 · Vinicius Mikuni🇺🇸 · Benjamin Nachman🇺🇸 · Miguel Arratia🇺🇸 · Bishnu Karki🇺🇸 · Ryan Milton🇺🇸 · Piyush Karande🇺🇸 · Aaron Angerami🇺🇸

   Score based generative models are a new class of generative models that have been shown to accurately generate high dimensional calorimeter datasets. Recent advances in generative models have used images with 3D voxels to represent and model complex calorimeter showers. Point clouds, however, are likely a more natural representation of calorimeter showers, particularly in calorimeters with high granularity. Point clouds preserve all of the information of the original simulation, more naturally deal with sparse datasets, and can be implemented with more compact models and data files. In this work, two state-of-the-art score based models are trained on the same set of calorimeter simulation and directly compared.

   ↳ cs.LGhep-exhep-phnucl-ex+1JINST(2024)·45 citations
10. 10*

    Exponential Resummation of QCD at finite chemical potential

    Sabarnya Mitra🇮🇳

    A comprehensive study of the QCD phase diagram is one of the challenging and open problems in high energy physics. Having significant astrophysical implications, this is also important in constructing the chronological evolution of the universe. With this aim, this thesis describes the behaviour of thermodynamic observables like pressure and number density with changing chemical potential $\mu$, through the method of an unbiased exponential resummation of lower order Taylor series of these observables at a finite $\mu$. We address the problem of biased estimates, which manifest uncontrollably in exponential resummation and which become severe in the domain of large values, higher orders of $\mu$ and also in observables which are higher $\mu$ derivatives of the thermodynamic potential. We show that our new formalism of unbiased exponential resummation can eliminate these biased estimates exactly upto a given order of $\mu$, and can capture important contributions of higher order Taylor series for all our working temperatures starting from hadronic phase to the plasma phase, including the crossover region. We also demonstrate that this new formalism is highly efficient in saving appreciable computational time and storage space for computations.

    ↳ hep-phhep-latnucl-exnucl-th2 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.