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9,021 results on '"Beghin A"'

2. Generalized random processes related to Hadamard operators and Le~Roy measures

Author

Beghin, Luisa, Cristofaro, Lorenzo, and Polito, Federico

Subjects
Mathematics - Probability, Primary: 60G22, 35S10. Secondary: 26A33, 33C15
Abstract

The definition of generalized random processes in Gel'fand sense allows to extend well-known stochastic models, such as the fractional Brownian motion, and study the related fractional pde's, as well as stochastic differential equations in distributional sense. By analogy with the construction (in the infinite-dimensional white-noise space) of the latter, we introduce two processes defined by means of Hadamard-type fractional operators. When used to replace the time derivative in the governing p.d.e.'s, the Hadamard-type derivatives are usually associated with ultra-slow diffusions. On the other hand, in our construction, they directly determine the memory properties of the so-called Hadamard fractional Brownian motion (H-fBm) and its long-time behaviour. Still, for any finite time horizon, the H-fBm displays a standard diffusing feature. We then extend the definition of the H-fBm from the white noise space to an infinite dimensional grey-noise space built on the Le Roy measure, so that our model represents an alternative to the generalized grey Brownian motion. In this case, we prove that the one-dimensional distribution of the process satisfies a heat equation with non-constant coefficients and fractional Hadamard time-derivative. Finally, once proved the existence of the distributional derivative of the above defined processes and derived an integral formula for it, we construct an Ornstein-Uhlenbeck type process and evaluate its distribution., Comment: 30 pages

Published
2024

3. Generalized Wright Analysis in Infinite Dimensions

Author

Beghin, Luisa, Cristofaro, Lorenzo, and da Silva, José L.

Subjects
Mathematics - Probability, Mathematics - Functional Analysis
Abstract

This paper investigates a broad class of non-Gaussian measures, $ \mu_\Psi$, associated with a family of generalized Wright functions, $_m\Psi_q$. First, we study these measures in Euclidean spaces $\mathbb{R}^d$, then define them in an abstract nuclear triple $\mathcal{N}\subset\mathcal{H}\subset\mathcal{N}'$. We study analyticity, invariance properties, and ergodicity under a particular group of automorphisms. Then we show the existence of an Appell system which allows the extension of the non-Gaussian Hilbert space $L^2(\mu_\Psi)$ to the nuclear triple consisting of test functions' and distributions' spaces, $(\mathcal{N})^{1}\subset L^2(\mu_\Psi)\subset(\mathcal{N})_{\mu_\Psi}^{-1}$. Thanks to this triple, we can study Donsker's delta as a well-defined object in the space of distributions $(\mathcal{N})_{\mu_\Psi}^{-1}$.

Published
2024

4. A discussion about violin reduction: geometric analysis of contour lines and channel of minima

Author

Beghin, Philémon, Ceulemans, Anne-Emmanuelle, and Glineur, François

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Some early violins have been reduced during their history to fit imposed morphological standards, while more recent ones have been built directly to these standards. We can observe differences between reduced and unreduced instruments, particularly in their contour lines and channel of minima. In a recent preliminary work, we computed and highlighted those two features for two instruments using triangular 3D meshes acquired by photogrammetry, whose fidelity has been assessed and validated with sub-millimetre accuracy. We propose here an extension to a corpus of 38 violins, violas and cellos, and introduce improved procedures, leading to a stronger discussion of the geometric analysis. We first recall the material we are working with. We then discuss how to derive the best reference plane for the violin alignment, which is crucial for the computation of contour lines and channel of minima. Finally, we show how to compute efficiently both characteristics and we illustrate our results with a few examples., Comment: Paper accepted (before reviewing) for the Florence Heri-Tech 2024 Conference

Published
2024

7. Fox-H densities and completely monotone generalized Wright functions

Author

Beghin, L., Cristofaro, L., and Da Silva, J. L.

Subjects
Mathematics - Probability
Abstract

Due to their flexibility, Fox-$H$ functions are widely studied and applied to many research topics, such as physics, statistics, viscoelasticity, etc. The special cases represented by the Mittag-Leffler and Wright functions prove their great impact. In this paper, we focus on certain explicit assumptions that allow us to use the Fox-$H$ functions as densities. We then provide a subfamily of the latter, called Fox-$H$ densities with moments of any order, and give their Laplace transforms as entire generalized Wright functions. The class of r.v.'s with these densities is proved to possess a monoid structure. We present eight subclasses of special cases of such densities (together with their Laplace transforms) that are particularly relevant in applications. To analyze the existence conditions of Fox-$H$ functions, we derive asymptotic results and their analytic extension.

Published
2023

8. A class of infinite-dimensional Gaussian processes defined through generalized fractional operators

Author

Beghin, Luisa, Cristofaro, Lorenzo, and Mishura, Yuliya

Subjects
Mathematics - Probability, 60G15, 26A33, 60H40, 60G22
Abstract

The generalization of fractional Brownian motion in infinite-dimensional white and grey noise spaces has been recently carried over, following the Mandelbrot-Van Ness representation, through Riemann-Liouville type fractional operators. Our aim is to extend this construction by means of general fractional derivatives and integrals, which we define through Bernstein functions. According to the conditions satisfied by the latter, some properties of these processes (such as continuity, local times, variance asymptotics and persistence) are derived. On the other hand, they are proved to display short- or long-range dependence, if obtained by means of a derivative or an integral, respectively, regardless of the Bernstein function chosen. Moreover, this kind of construction allows us to define the corresponding noise and to derive an Ornstein-Uhlenbeck type process, as solution of an integral equation., Comment: 39 pages

Published
2023

10. Using Currere as a Way to Start Dialogic Conversations When Introducing Transculture and Culture to Classrooms

Author

Beghin, Hannah

Abstract

Teaching students how to be respectful and aware of cultural and transcultural differences is often overwhelming for students and teachers. Students need to be understanding of different cultures and transculture because all humans will interact with others whose cultures differ from theirs. Understanding transculture and cultural differences and issues is important for better understanding of others. Allowing students time to write a currere is a way for students to think about their experiences related to culture, while also reflecting on the knowledge and understanding that they currently have on a culture. This is a personal way for students to think about their knowledge, while also thinking ahead to what they would like to understand about culture. Once students have had time to personally reflect in a currere, providing class time for students to converse is a great way to question, teach, discuss, and share experiences about culture.

Published
2022

11. Renewal processes linked to fractional relaxation equations with variable order

Author

Beghin, Luisa, Cristofaro, Lorenzo, and Garrappa, Roberto

Subjects
Mathematics - Probability, Mathematics - Classical Analysis and ODEs, 26A33, 60K15
Abstract

We introduce and study here a renewal process defined by means of a time-fractional relaxation equation with derivative order $\alpha(t)$ varying with time $t\geq0$. In particular, we use the operator introduced by Scarpi in the Seventies and later reformulated in the regularized Caputo sense in Garrappa et al. (2021), inside the framework of the so-called general fractional calculus. The model obtained extends the well-known time-fractional Poisson process of fixed order $\alpha \in (0,1)$ and tries to overcome its limitation consisting in the constancy of the derivative order (and therefore of the memory degree of the interarrival times) with respect to time. The variable order renewal process is proved to fall outside the usual subordinated representation, since it can not be simply defined as a Poisson process with random time (as happens in the standard fractional case). Finally a related continuous-time random walk model is analysed and its limiting behavior established., Comment: 15 pages, 4 fig

Published
2023

12. Non-Gaussian Measures in Infinite Dimensional Spaces: the Gamma-Grey Noise

Author

Beghin, Luisa, Cristofaro, Lorenzo, and Gajda, Janusz

Subjects
Mathematics - Probability
Abstract

In the context of non-Gaussian analysis, Schneider [27] introduced grey noise measures, built upon Mittag-Leffler functions; analogously, grey Brownian motion and its generalizations were constructed (see, for example, [25], [6], [7], [8]). In this paper, we construct and study a new non-Gaussian measure, by means of the incomplete-gamma function (exploiting its complete monotonicity). We label this measure Gamma-grey noise and we prove, for it, the existence of Appell system. The related generalized processes, in the infinite dimensional setting, are also defined and, through the use of the Riemann-Liouville fractional operators, the (possibly tempered) Gamma-grey Brownian motion is consequently introduced. A number of different characterizations of these processes are also provided, together with the integro-differential equation satisfied by their transition densities. They allow to model anomalous diffusions, mimicking the procedures of classical stochastic calculus.

Published
2022

13. Azimuthal correlations in Z +jets events in proton-proton collisions at s=13TeV.

Author

Tumasyan, A, Adam, W, Andrejkovic, J, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, F, Schieck, J, Schöfbeck, R, Schwarz, D, Templ, S, Waltenberger, W, Wulz, C-E, Darwish, M, De Wolf, E, Janssen, T, Kello, T, Lelek, A, Sfar, H, Mechelen, P, Putte, S, Remortel, N, Bols, E, DHondt, J, De Moor, A, Delcourt, M, El Faham, H, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, A, Tavernier, S, Van Doninck, W, Vannerom, D, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Kalsi, A, Lee, K, Mahdavikhorrami, M, Makarenko, I, Paredes, S, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M, Velde, C, Vanlaer, P, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Rendón, C, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Bossche, N, Vermassen, B, Wezenbeek, L, Benecke, A, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, I, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, T, Vischia, P, Wertz, S, Alves, G, Hensel, C, Moraes, A, Teles, P, and Júnior, W

Abstract

The production of Z bosons associated with jets is measured in pp collisions at s=13TeV with data recorded with the CMS experiment at the LHC corresponding to an integrated luminosity of 36.3fb-1. The multiplicity of jets with transverse momentum pT>30GeV is measured for different regions of the Z bosons pT(Z), from lower than 10GeV to higher than 100GeV. The azimuthal correlation Δϕ between the Z boson and the leading jet, as well as the correlations between the two leading jets are measured in three regions of pT(Z). The measurements are compared with several predictions at leading and next-to-leading orders, interfaced with parton showers. Predictions based on transverse-momentum dependent parton distributions and corresponding parton showers give a good description of the measurement in the regions where multiple parton interactions and higher jet multiplicities are not important. The effects of multiple parton interactions are shown to be important to correctly describe the measured spectra in the low pT(Z) regions.

Published
2023

14. Measurements of jet multiplicity and jet transverse momentum in multijet events in proton-proton collisions at s=13TeV.

Author

Tumasyan, A, Adam, W, Andrejkovic, J, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, F, Schieck, J, Schöfbeck, R, Schwarz, D, Templ, S, Waltenberger, W, Wulz, C-E, Darwish, M, De Wolf, E, Janssen, T, Kello, T, Lelek, A, Sfar, H, Mechelen, P, Putte, S, Remortel, N, Blekman, F, Bols, E, DHondt, J, Delcourt, M, Faham, H, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, A, Tavernier, S, Doninck, W, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, A, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M, Velde, C, Vanlaer, P, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Vermassen, B, Wezenbeek, L, Benecke, A, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, I, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, T, Vischia, P, Wertz, S, Alves, G, Hensel, C, Moraes, A, Teles, P, Júnior, W, Pereira, M, and Filho, M

Abstract

Multijet events at large transverse momentum (pT) are measured at s=13TeV using data recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 36.3fb-1. The multiplicity of jets with pT>50GeV that are produced in association with a high-pT dijet system is measured in various ranges of the pT of the jet with the highest transverse momentum and as a function of the azimuthal angle difference Δϕ1,2 between the two highest pT jets in the dijet system. The differential production cross sections are measured as a function of the transverse momenta of the four highest pT jets. The measurements are compared with leading and next-to-leading order matrix element calculations supplemented with simulations of parton shower, hadronization, and multiparton interactions. In addition, the measurements are compared with next-to-leading order matrix element calculations combined with transverse-momentum dependent parton densities and transverse-momentum dependent parton shower.

Published
2023

15. Measurement of the mass dependence of the transverse momentum of lepton pairs in Drell-Yan production in proton-proton collisions at s=13TeV.

Author

Tumasyan, A, Adam, W, Andrejkovic, J, Bergauer, T, Chatterjee, S, Dragicevic, M, Valle, A, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, F, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Darwish, M, De Wolf, E, Janssen, T, Kello, T, Lelek, A, Sfar, H, Mechelen, P, Putte, S, Remortel, N, Blekman, F, Bols, E, DHondt, J, Delcourt, M, Faham, H, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, A, Tavernier, S, Doninck, W, Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, A, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M, Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Vermassen, B, Vit, M, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, I, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, T, Vischia, P, Wertz, S, Alves, G, Hensel, C, Moraes, A, Júnior, W, Pereira, M, and Filho, M

Abstract

The double differential cross sections of the Drell-Yan lepton pair (ℓ+ℓ-, dielectron or dimuon) production are measured as functions of the invariant mass mℓℓ, transverse momentum pT(ℓℓ), and φη∗. The φη∗ observable, derived from angular measurements of the leptons and highly correlated with pT(ℓℓ), is used to probe the low-pT(ℓℓ) region in a complementary way. Dilepton masses up to 1TeV are investigated. Additionally, a measurement is performed requiring at least one jet in the final state. To benefit from partial cancellation of the systematic uncertainty, the ratios of the differential cross sections for various mℓℓ ranges to those in the Z mass peak interval are presented. The collected data correspond to an integrated luminosity of 36.3fb-1 of proton-proton collisions recorded with the CMS detector at the LHC at a centre-of-mass energy of 13TeV. Measurements are compared with predictions based on perturbative quantum chromodynamics, including soft-gluon resummation.

Published
2023

16. Search for light Higgs bosons from supersymmetric cascade decays in pp collisions at s=13TeV.

Author

Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, FM, Schieck, J, Schöfbeck, R, Schwarz, D, Templ, S, Waltenberger, W, Wulz, C-E, Darwish, MR, De Wolf, EA, Janssen, T, Kello, T, Lelek, A, Sfar, H Rejeb, Mechelen, P Van, Putte, S Van, Remortel, N Van, Bols, ES, D'Hondt, J, De Moor, A, Delcourt, M, Faham, H El, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Doninck, W Van, Vannerom, D, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Paredes, S, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Velde, C Vander, Vanlaer, P, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Rendón, C, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Vermassen, B, Wezenbeek, L, Benecke, A, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, TT, Vischia, P, Wertz, S, Alves, GA, Hensel, C, Moraes, A, Teles, P Rebello, and Júnior, WL Aldá

Subjects
CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

A search is reported for pairs of light Higgs bosons (H1) produced in supersymmetric cascade decays in final states with small missing transverse momentum. A data set of LHC pp collisions collected with the CMS detector at s=13TeV and corresponding to an integrated luminosity of 138fb-1 is used. The search targets events where both H1 bosons decay into pairs that are reconstructed as large-radius jets using substructure techniques. No evidence is found for an excess of events beyond the background expectations of the standard model (SM). Results from the search are interpreted in the next-to-minimal supersymmetric extension of the SM, where a "singlino" of small mass leads to squark and gluino cascade decays that can predominantly end in a highly Lorentz-boosted singlet-like H1 and a singlino-like neutralino of small transverse momentum. Upper limits are set on the product of the squark or gluino pair production cross section and the square of the branching fraction of the H1 in a benchmark model containing almost mass-degenerate gluinos and light-flavour squarks. Under the assumption of an SM-like branching fraction, H1 bosons with masses in the range 40-120GeV arising from the decays of squarks or gluinos with a mass of 1200-2500GeV are excluded at 95% confidence level.

Published
2023

17. CMS pythia  8 colour reconnection tunes based on underlying-event data.

Author

Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, FM, Schieck, J, Schöfbeck, R, Schwarz, D, Templ, S, Waltenberger, W, Wulz, C-E, Darwish, MR, De Wolf, EA, Janssen, T, Kello, T, Lelek, A, Sfar, H Rejeb, Mechelen, P Van, Putte, S Van, Remortel, N Van, Bols, ES, D'Hondt, J, Delcourt, M, Faham, H El, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Doninck, W Van, Vannerom, D, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Paredes, S, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Velde, C Vander, Vanlaer, P, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Rendón, C, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Vermassen, B, Wezenbeek, L, Benecke, A, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, TT, Vischia, P, Wertz, S, Alves, GA, Hensel, C, Moraes, A, Teles, P Rebello, Júnior, WL Aldá, and Pereira, M Alves Gallo

Subjects
CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

New sets of parameter tunes for two of the colour reconnection models, quantum chromodynamics-inspired and gluon-move, implemented in the pythia  8 event generator, are obtained based on the default CMS pythia  8 underlying-event tune, CP5. Measurements sensitive to the underlying event performed by the CMS experiment at centre-of-mass energies s=7 and 13TeV, and by the CDF experiment at 1.96TeV are used to constrain the parameters of colour reconnection models and multiple-parton interactions simultaneously. The new colour reconnection tunes are compared with various measurements at 1.96, 7, 8, and 13TeV including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair (tt¯) events. The new tunes are also used to estimate the uncertainty related to colour reconnection modelling in the top quark mass measurement using the decay products of tt¯ events in the semileptonic channel at 13TeV.

Published
2023

18. The tempered space-fractional Cattaneo equation

Author

Beghin, Luisa, Garra, Roberto, Mainardi, Francesco, and Pagnini, Gianni

Subjects
Mathematics - Probability, 26A33, 33E12, 35C05, 44A10, 60H30
Abstract

We consider the time-fractional Cattaneo equation involving the tempered Caputo space-fractional derivative. We find the characteristic function of the related process and we explain the main differences with previous stochastic treatments of the time-fractional Cattaneo equation., Comment: 11 pages

Published
2022

19. Validation of a photogrammetric approach for the objective study of ancient bowed instruments

Author

Beghin, Philémon, Ceulemans, Anne-Emmanuelle, Fisette, Paul, and Glineur, François

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Some early violins have been reduced during their history to fit imposed morphological standards, while more recent ones have been built directly to these standards. We propose an objective photogrammetric approach to differentiate between a reduced and an unreduced instrument, whereby a three-dimensional mesh is studied geometrically by examining 2D slices. Our contribution is twofold. First, we validate the quality of the photogrammetric mesh through a comparison with reference images obtained by medical imaging, and conclude that a sub-millimetre accuracy is achieved. Then, we show how quantitative and qualitative features such as contour lines, channel of minima and a measure of asymmetry between the upper and lower surfaces of a violin can be automatically extracted from the validated photogrammetric meshes, allowing to successfully highlight differences between instruments.

Published
2022
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20. The Benefits of Inclusion for Students on the Autism Spectrum

Author

Beghin, Hannah

Abstract

Children with autism have a right to be within inclusive classrooms. There are many benefits to having inclusive classrooms, including reducing stigma surrounding autism, creating respectful relationships between all students within a classroom, teaching all students how to act positively with others, and increasing knowledge of autism. To best create an inclusive classroom, teachers should continue differentiating instruction, should teach to a student's interests and needs, and should meet with family members of students with autism to better understand the needs of the child. All students can benefit from being in an inclusive classroom setting, and teachers often already implement teaching strategies that would best support a child with autism.

Published
2021

24. The Effects of Cyberbullying on Students and Schools

Author

Beghin, Hannah

Abstract

Cyberbullying is a problem that affects students and schools. As more children and adolescents have contact with devices, the likelihood of cyberbullying has become more prevalent. Cyberbullying affects the learning of children within class, as the students become self-conscious or distracted. Schools should have clear directives for taking cyberbullying action, and should support professional development for teachers so they can learn what they can do to when dealing with cyberbullying in their classrooms. To reduce cyberbullying, classrooms should celebrate and support student diversities, and students should be taught about how to be caring when interacting with others online.

Published
2020

25. Stochastic solutions for time-fractional heat equations with complex spatial variables

Author

Beghin, Luisa and De Gregorio, Alessandro

Subjects
Mathematics - Probability, 26A33, 60G22
Abstract

We deal with complex spatial diffusion equations with time-fractional derivative and study their stochastic solutions. In particular, we complexify the integral operator solution to the heat-type equation where the time derivative is replaced with the convolution-type generalization of the regularized Caputo derivative. We prove that this operator is solution of a complex time-fractional heat equation with complex spatial variable. This approach leads to a wrapped Brownian motion on a circle time-changed by the inverse of the related subordinator. This time-changed Brownian motion is analyzed and, in particular, some results on its moments, as well as its construction as weak limit of continuous-time random walks, are obtained. The extension of our approach to the higher dimensional case is also provided., Comment: 18 pages

Published
2021

30. Observation of B0→ψ(2S)KS0π+π- and Bs0→ψ(2S)KS0 decays

Author

Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, FM, Schieck, J, Schöfbeck, R, Schwarz, D, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, T, Kello, T, Lelek, A, Sfar, H Rejeb, Mechelen, P Van, Putte, S Van, Remortel, N Van, Bols, ES, D’Hondt, J, De Moor, A, Delcourt, M, Faham, H El, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Doninck, W Van, Vannerom, D, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Paredes, S, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Velde, C Vander, Vanlaer, P, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Rendón, C, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Vermassen, B, Wezenbeek, L, Benecke, A, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, TT, Vischia, P, Wertz, S, Alves, GA, and Hensel, C

Subjects
Particle and High Energy Physics, Physical Sciences, CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

Using a data sample of s = 13 TeV proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of 103 fb - 1 , the B s 0 → ψ ( 2S ) K S 0 and B 0 → ψ ( 2S ) K S 0 π + π - decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to B ( B s 0 → ψ ( 2S ) K S 0 ) / B ( B 0 → ψ ( 2S ) K S 0 ) = ( 3.33 ± 0.69 ( stat ) ± 0.11 ( syst ) ± 0.34 ( f s / f d ) ) × 10 - 2 and B ( B 0 → ψ ( 2S ) K S 0 π + π - ) / B ( B 0 → ψ ( 2S ) K S 0 ) = 0.480 ± 0.013 ( stat ) ± 0.032 ( syst ) , where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of B s 0 and B 0 mesons, f s / f d .

Published
2022

31. Search for low-mass dilepton resonances in Higgs boson decays to four-lepton final states in proton–proton collisions at s=13TeV

Author

Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, and Hensel, C

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

A search for low-mass dilepton resonances in Higgs boson decays is conducted in the four-lepton final state. The decay is assumed to proceed via a pair of beyond the standard model particles, or one such particle and a Z boson. The search uses proton-proton collision data collected with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 137 fb - 1 , at a center-of-mass energy s = 13 TeV . No significant deviation from the standard model expectation is observed. Upper limits at 95% confidence level are set on model-independent Higgs boson decay branching fractions. Additionally, limits on dark photon and axion-like particle production, based on two specific models, are reported.

Published
2022

32. Non-central moderate deviations for compound fractional Poisson processes

Author

Beghin, Luisa and Macci, Claudio

Subjects
Mathematics - Probability, 60F10, 60F05, 60G22, 33E12
Abstract

The term "moderate deviations" is often used in the literature to mean a class of large deviation principles that, in some sense, fill the gap between a convergence in probability to zero (governed by a large deviation principle) and a weak convergence to a centered Normal distribution. We talk about "non-central moderate deviations" when the weak convergence is towards a non-Gaussian distribution. In this paper we study non-central moderate deviations for compound fractional Poisson processes with light-tailed jumps., Comment: 9 pages

Published
2021

36. Search for strongly interacting massive particles generating trackless jets in proton–proton collisions at s=13TeV

Author

Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Del Valle, A Escalante, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, Hensel, C, and Moraes, A

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

A search for dark matter in the form of strongly interacting massive particles (SIMPs) using the CMS detector at the LHC is presented. The SIMPs would be produced in pairs that manifest themselves as pairs of jets without tracks. The energy fraction of jets carried by charged particles is used as a key discriminator to suppress efficiently the large multijet background, and the remaining background is estimated directly from data. The search is performed using proton-proton collision data corresponding to an integrated luminosity of 16.1 fb - 1 , collected with the CMS detector in 2016. No significant excess of events is observed above the expected background. For the simplified dark matter model under consideration, SIMPs with masses up to 100 GeV are excluded and further sensitivity is explored towards higher masses.

Published
2022

37. Search for long-lived particles decaying to leptons with large impact parameter in proton–proton collisions at s=13Te

Author

Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, FM, Schieck, J, Schöfbeck, R, Schwarz, D, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, T, Kello, T, Lelek, A, Sfar, H Rejeb, Van Mechelen, P, Van Putte, S, Remortel, N Van, Blekman, F, Bols, ES, D’Hondt, J, Delcourt, M, El Faham, H, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Van Doninck, W, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Velde, C Vander, Vanlaer, P, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Vermassen, B, Wezenbeek, L, Benecke, A, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, TT, Vischia, P, Wertz, S, Alves, GA, Hensel, C, Moraes, A, and Júnior, WL Aldá

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract

A search for new long-lived particles decaying to leptons using proton-proton collision data produced by the CERN LHC at s=13Te is presented. Events are selected with two leptons (an electron and a muon, two electrons, or two muons) that both have transverse impact parameter values between 0.01 and 10 cm and are not required to form a common vertex. Data used for the analysis were collected with the CMS detector in 2016, 2017, and 2018, and correspond to an integrated luminosity of 118 (113) fb-1 in the ee channel ( eμ and μμ channels). The search is designed to be sensitive to a wide range of models with displaced eμ , ee , and μμ final states. The results constrain several well-motivated models involving new long-lived particles that decay to displaced leptons. For some areas of the available phase space, these are the most stringent constraints to date.

Published
2022

38. Measurements of the associated production of a W boson and a charm quark in proton-proton collisions at s=8TeV.

Author

Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, T, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Haevermaet, H Van, Mechelen, P Van, Putte, S Van, Remortel, N Van, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Doninck, W Van, Mulders, P Van, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wuyckens, S, Zobec, J, Alves, GA, and Hensel, C

Subjects
CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

Measurements of the associated production of a W boson and a charm ( c ) quark in proton-proton collisions at a centre-of-mass energy of 8 TeV are reported. The analysis uses a data sample corresponding to a total integrated luminosity of 19.7 fb-1 collected by the CMS detector at the LHC. The W bosons are identified through their leptonic decays to an electron or a muon, and a neutrino. Charm quark jets are selected using distinctive signatures of charm hadron decays. The product of the cross section and branching fraction σ(pp→W+c+X)B(W→ℓν) , where ℓ=e or μ , and the cross section ratio σ(pp→W++c¯+X)/σ(pp→W-+c+X) are measured in a fiducial volume and differentially as functions of the pseudorapidity and of the transverse momentum of the lepton from the W boson decay. The results are compared with theoretical predictions. The impact of these measurements on the determination of the strange quark distribution is assessed.

Published
2022

39. Stochastic applications of Caputo-type convolution operators with non-singular kernels

Author

Beghin, Luisa and Caputo, Michele

Subjects
Mathematics - Probability, 26A33, 47G20, 60G51, 33B20
Abstract

We consider here convolution operators, in the Caputo sense, with non-singular kernels. We prove that the solutions to some integro-differential equations with such operators (acting on the space variable) coincide with the transition densities of a particular class of L\'evy subordinators (i.e. compound Poisson processes with non-negative jumps). We then extend these results to the case where the kernels of the operators have random parameters, with given distribution. This assumption allows greater flexibility in the choice of the kernel's parameters and, consequently, of the jumps' density function., Comment: 16 pages

Published
2021

40. L\'evy processes linked to the lower-incomplete gamma function

Author

Beghin, Luisa and Ricciuti, Costantino

Subjects
Mathematics - Probability, 33B20, 26A33, 60G51, 60J65, 34A08 26A33, 60G51, 60J65, 34A08
Abstract

We start by defining a subordinator by means of the lower-incomplete gamma function. It can be considered as an approximation of the stable subordinator, easier to be handled thank to its finite activity. A tempered version is also considered in order to overcome the drawback of infinite moments. Then, we study L\'{e}vy processes time-changed by these subordinators, with particular attention to the Brownian case. An approximation of the fractional derivative (as well as of the fractional power of operators) arises from the analysis of governing equations. Finally, we show that time-changing the fractional Brownian motion gives a model of anomalous diffusion, which exhibits a sub-diffusive behavior., Comment: 17 pages

Published
2021

48. Precision luminosity measurement in proton–proton collisions at s=13TeV in 2015 and 2016 at CMS

Author

Sirunyan, AM, Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, X, Kello, T, Lelek, A, Sfar, H Rejeb, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, D’Hondt, J, De Clercq, J, Delcourt, M, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Mestdach, G, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, Hensel, C, Moraes, A, Júnior, WL Aldá, Filho, M Barroso Ferreira, and Malbouisson, H Brandao

Subjects
CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

The measurement of the luminosity recorded by the CMS detector installed at LHC interaction point 5, using proton-proton collisions at s=13TeV in 2015 and 2016, is reported. The absolute luminosity scale is measured for individual bunch crossings using beam-separation scans (the van der Meer method), with a relative precision of 1.3 and 1.0% in 2015 and 2016, respectively. The dominant sources of uncertainty are related to residual differences between the measured beam positions and the ones provided by the operational settings of the LHC magnets, the factorizability of the proton bunch spatial density functions in the coordinates transverse to the beam direction, and the modeling of the effect of electromagnetic interactions among protons in the colliding bunches. When applying the van der Meer calibration to the entire run periods, the integrated luminosities when CMS was fully operational are 2.27 and 36.3 fb-1 in 2015 and 2016, with a relative precision of 1.6 and 1.2%, respectively. These are among the most precise luminosity measurements at bunched-beam hadron colliders.

Published
2021

49. Search for a heavy vector resonance decaying to a Z boson and a Higgs boson in proton-proton collisions at s=13Te

Author

Sirunyan, AM, Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Müller, D, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, and Alves, GA

Subjects
CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract

A search is presented for a heavy vector resonance decaying into a Z boson and the standard model Higgs boson, where the Z boson is identified through its leptonic decays to electrons, muons, or neutrinos, and the Higgs boson is identified through its hadronic decays. The search is performed in a Lorentz-boosted regime and is based on data collected from 2016 to 2018 at the CERN LHC, corresponding to an integrated luminosity of 137 fb-1 . Upper limits are derived on the production of a narrow heavy resonance Z' , and a mass below 3.5 and 3.7 Te is excluded at 95% confidence level in models where the heavy vector boson couples predominantly to fermions and to bosons, respectively. These are the most stringent limits placed on the Heavy Vector Triplet Z' model to date. If the heavy vector boson couples exclusively to standard model bosons, upper limits on the product of the cross section and branching fraction are set between 23 and 0.3 fb for a Z' mass between 0.8 and 4.6 Te , respectively. This is the first limit set on a heavy vector boson coupling exclusively to standard model bosons in its production and decay.

Published
2021

50. Measurement of the Wγ Production Cross Section in Proton-Proton Collisions at s=13 TeV and Constraints on Effective Field Theory Coefficients

Author

Sirunyan, AM, Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Dragicevic, M, Del Valle, A Escalante, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, X, Kello, T, Lelek, A, Sfar, H Rejeb, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, D’Hondt, J, De Clercq, J, Delcourt, M, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, AK, Lee, K, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Mestdach, G, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, Hensel, C, Moraes, A, Júnior, WL Aldá, Filho, M Barroso Ferreira, Malbouisson, H Brandao, Carvalho, W, and Chinellato, J

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CMS Collaboration, hep-ex, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

A fiducial cross section for Wγ production in proton-proton collisions is measured at a center-of-mass energy of 13 TeV in 137  fb^{-1} of data collected using the CMS detector at the LHC. The W→eν and μν decay modes are used in a maximum-likelihood fit to the lepton-photon invariant mass distribution to extract the combined cross section. The measured cross section is compared with theoretical expectations at next-to-leading order in quantum chromodynamics. In addition, 95% confidence level intervals are reported for anomalous triple-gauge couplings within the framework of effective field theory.

Published
2021

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