Wed·Jan 4, 2023Wednesday·January 4, 2023

1. 01*

   Dijet azimuthal decorrelation in $e^{+}{e}^{-}$ annihilation

   Hana Benslama🇩🇿 · Yazid Delenda🇩🇿 · Kamel Khelifa-Kerfa🇩🇿

   We examine non-global and clustering logarithms in the distribution of the azimuthal decorrelation between two jets in $e^{+}{e}^{-}\to$ dijet events, where the jets are defined with $E$-scheme recombination in the generalized $k_t$ algorithm. We calculate at one loop and to all orders the leading global single logarithms in the distribution of the said observable. We also compute at fixed order up to four loops at finite $N_c$ the non-global and clustering logarithms, and numerically resum them to all orders in the large-$N_c$ approximation. We compare our results at $\mathcal{O}({\alpha }_s)$ and $\mathcal{O}({\alpha }_s^2)$ with those of the EVENT2 fixed-order Monte Carlo program and find agreement of the leading singular behavior of the azimuthal decorrelation distribution. We find that the impact of non-global logarithms on the resummed distribution in the anti-$k_t$ algorithm is substantial, while it is significantly smaller in the $k_t$ algorithm. Furthermore, the combined clustering and non-global logarithms in the $k_t$ algorithm have an even smaller effect on the distribution. Finally, we use the program Gnole to calculate the resummed distribution at NLL accuracy, thus achieving state-of-the-art accuracy for the resummation of this quantity.

   hep-phPLB(2023)·6 citations
2. 02*

   Enhanced prospects for direct detection of inelastic dark matter from a non-galactic diffuse component

   Gonzalo Herrera🇩🇪 · Alejandro Ibarra🇩🇪 · Satoshi Shirai🇯🇵

   In some scenarios, the dark matter particle predominantly scatters inelastically with the target, producing a heavier neutral particle in the final state. In this class of scenarios, the reach in parameter space of direct detection experiments is limited by the velocity of the dark matter particle, usually taken as the escape velocity from the Milky Way. On the other hand, it has been argued that a fraction of the dark matter particles in the Solar System could be bound to the envelope of the Local Group or to the Virgo Supercluster, and not to our Galaxy, and therefore could carry velocities larger than the escape velocity from the Milky Way. In this paper we estimate the enhancement in sensitivity of current direct detection experiments to inelastic dark matter scatterings with nucleons or electrons due to the non-galactic diffuse components, and we discuss the implications for some well motivated models.

   hep-phastro-ph.COJCAP(2023)·29 citations
3. 03*

   Production cross section of heavy quarks in ep interaction at the NLO approximation

   S. Zarrin🇮🇷 · S. Dadfar🇮🇷 · M. Sayahi🇮🇷

   We present the production cross section of heavy quarks \sigma^{cc}, \sigma^{bb} and {\sigma^{tt}} at the next-to-leading order in the electron-proton interaction by using the quarks and gluon distribution functions at the initial scale Q^{2}_{0}. To do this, we use a fitted form of the heavy quark coefficient functions for deep-inelastic lepton-hadron scattering to obtain the structure functions of heavy quarks. Then, we calculate the reduced cross section of heavy quarks by using the structure functions and subsequently present the single differential and the integrated cross section of heavy quarks at the center-of-mass energies of 319 GeV , 1.3 TeV and 3.5 TeV in the electron-proton collision. The obtained numerical results of the cross section of the charm and beauty quarks are compared with the HERA data, which is a combination from the results of the H1 and ZEUS detectors, and with the predictions from H1PDF, MSTW2008 and MSRT03. Furthermore, we present the production cross section of top quark as a direct prediction from our calculations.

   hep-phNPA(2023)·0 citations
4. 04*

   The $\Sigma$ and $\Xi$ electromagnetic form factors in the extended vector meson dominance model

   Bing Yan🇨🇳 · Cheng Chen🇨🇳 · Ju-Jun Xie🇨🇳

   We propose a phenomenological extended vector meson dominance model for the baryon electromagnetic structure, and it is found that the current experimental data on the $\Sigma$ and $\Xi$ electromagnetic form factors in the time-like region can be well described. Meanwhile, we can also reproduce the ratios of the total cross sections of reactions $e^{+}{e}^{-}\to {\Sigma }^{+}{\bar{\Sigma }}^{-}$, ${\Sigma }^0{\bar{\Sigma }}^0$, and ${\Sigma }^{-}{\bar{\Sigma }}^{+}$, which are $9.7\pm 1.3:3.3\pm 0.7:1$ at center-of-mass energies from $2.3864$ to $3.02$ GeV. We also analytically continue the expression of the form factors to space-like region and estimate the charge radii of the $\Sigma$ and $\Xi$ hyperons. The result for the ${\Sigma }^{-}$ is in agreement with the experimental date.

   hep-phnucl-thPRD(2023)·24 citations
5. 05*

   Bottomonium suppression in the quark-gluon plasma -- From effective field theories to non-unitary quantum evolution

   Michael Strickland🇺🇸

   In this proceedings contribution I review recent work which computes the suppression of bottomonium production in heavy-ion collisions using open quantum systems methods applied within the potential non-relativistic quantum chromodynamics (pNRQCD) effective field theory. I discuss how the computation of bottomonium suppression can be reduced to solving a Gorini-Kossakowski-Sudarshan-Lindblad (GKSL) quantum master equation for the evolution of the b-bbar reduced density matrix. The open quantum systems approach used allows one to take into account the non-equilibrium dynamics and decoherence of bottomonium in the quark-gluon plasma. Finally, I present comparisons of phenomenological predictions obtained using a recently obtained next-to-leading-order GKSL equation with ALICE, ATLAS, and CMS experimental data for bottomonium suppression and elliptic flow.

   hep-phnucl-thActa Phys.Polon.Supp.(2023)·0 citations
6. 06*

   The dipole cross section by the unintegrated gluon distribution at small $x$

   G.R.Boroun🇮🇷

   We apply a previously developed scheme to consistently include the improved saturation model for the unintegrated gluon distribution (UGD) in order to evaluate, in the framework of $k_t$ factorization, at small $x$ at the next-to-leading order (NLO) in ${\alpha }_s$. We start the unintegrated gluon distribution with a parametrization of the deep inelastic structure function for electromagnetic scattering with protons, and then extract the color dipole cross section, which preserves its behavior success in a wide range of $k_t^2$ in comparisons with the UGD models (M. Hentschinski, A. Sabio Vera and C. Salas (HSS), I.P.Ivanov and N.N.Nikolaev (IN) and G. Watt, A.D. Martin and M.G. Ryskin (WMR)) . These results show that the geometric scaling holds for the improved saturation model in a wide kinematic region $r{Q}_s$, and are comparable with the Golec-Biernat-W$\ddot{\mathrm{u}}$sthoff (GBW) model. The unintegrated gluon distribution at low and high momentum transfer in a wide range of $x$ is considered.

   hep-phPRD(2023)·15 citations
7. 07*

   NNLO QCD corrections to event shapes at the LHC

   Manuel Alvarez🇪🇸 · Josu Cantero🇪🇸 · Michal Czakon🇩🇪 · Javier Llorente🇨🇦 · Alexander Mitov🇬🇧 · Rene Poncelet🇬🇧

   In this work we perform the first ever calculation of jet event shapes at hadron colliders at next-to-next-to leading order (NNLO) in QCD. The inclusion of higher order corrections removes the shape difference observed between data and next-to-leading order predictions. The theory uncertainty at NNLO is comparable to, or slightly larger than, existing measurements. Except for narrow kinematical ranges where all-order resummation becomes important, the NNLO predictions for the event shapes considered in the present work are reliable. As a prime application of the results derived in this work we provide a detailed investigation of the prospects for the precision determination of the strong coupling constant and its running through TeV scales from LHC data.

   hep-phhep-exJHEP(2023)·55 citations
8. 08*

   BSMArt: simple and fast parameter space scans

   Mark D. Goodsell🇫🇷 · Ari Joury🇫🇷

   We introduce BSMArt, a python program for the exploration of parameter spaces of theories Beyond the Standard Model. Especially designed for use with the SARAH family of tools, it is also sufficiently flexible to be used with a wide variety of external codes. BSMArt contains the first public release of the Active Learning scan by the same authors; but contains several additional scanning algorithms, ranging from the very simple to MultiNest and Diver. A BSMArt scan can be set up in a matter of minutes with only minimal editing of configuration files; installation scripts for all relevant tools and examples are provided.

   hep-phComput.Phys.Commun.(2024)·29 citations
9. 09*

   New reaction approach to reflect exotic structure of hadronic molecular state

   Zuo-Ming Ding🇨🇳 · Jun He🇨🇳 · Xiang Liu🇨🇳

   With the accumulation of experimental data, more and more exotic hadrons are observed. Among the interpretations of these exotic hadrons, molecular state and compact multiquark are two of the most popular pictures. However, it is still difficult to determine the structure of an exotic hadron. In this work, we propose a possible way to detect the internal structure of an exotic state. When a molecular state composed of two consistent hadrons is attacked by another particle, one of the constituents should be kicked out while another quasifree constituent stays almost unaffected. It is different from a compact multiquark which has no obvious subcluster. In this work, taking the $X(3872)$ as an example, we perform a Dalitz plot analysis of such reaction to find the effect of the different internal structures. Under the assumption of the $X(3872)$ as a molecular state or a compact tetraquark state, with the help of the effective Lagrangians, the Dalitz plot and the invariant mass spectrum are estimated with different total invariant mass of three final particles, and the effect of different binding energies is also discussed. Obvious event concentration can be observed as strips in the Dalitz plot and sharp peaks in the invariant mass spectrum for the $X(3872)$ with a small binding energy under the molecular state picture, while such concentration cannot be observed under the compact tetraquark picture. Such phenomenon can be applied to identify the internal structure of a new hadron state.

   hep-phPRD(2023)·2 citations
10. 10*

    Higgs $p_t$ distribution in Higgs + jet production at hadron colliders within the noncommutative effective standard model

    Mohamed El Arebi Gadja🇩🇿 · Lamine Khodja🇩🇿 · Yazid Delenda🇩🇿

    We use the noncommutative Higgs effective standard model to make a phenomenological prediction for the transverse momentum distribution of the Higgs boson produced in association with a jet at hadron colliders. We calculate at leading order in the noncommutative parameter $\Theta$ as well as leading order in the strong coupling ${\alpha }_s$, the one-loop $p_t$ distribution of the Higgs boson. As in the standard model, the fixed-order distribution suffers from large logarithms at small $p_t$ which require an all-orders resummation. We find that the large-$p_t$ region of the distribution is strongly affected by the non-commutativity, while small-$p_t$ region is not. Following this observation, we propose a simple matching method that allows us to compute a result that is also valid at small $p_t$ obtained with standard-model parton showers such as Pythia 8. We also compare our results with the next-to-leading order (NLO) and next-to-next-to-leading order (NNLO) distributions in the standard model, in order to assess the importance of higher-order effects in the search for non-commutativity at colliders.

    hep-phMod.Phys.Lett.A(2023)·2 citations
11. 11*

    Fermion pair radiation from accelerating classical systems

    Margarita Gavrilova🇺🇸 · Mitrajyoti Ghosh🇺🇸 · Yuval Grossman🇺🇸 · Walter Tangarife🇺🇸 · Tien-Hsueh Tsai🇹🇼

    Accelerating classical systems that couple to a fermion-antifermion pair at the microscopic level can radiate pairs of fermions and lose energy in the process. In this work, we derive the generalization of the Larmor formula for fermion pair radiation. We focus on the case of a point-like classical source in an elliptical orbit that emits fermions through vector and scalar mediators. Ultra-light fermion emission from such systems becomes relevant when the mass of the mediator is larger than the frequency of the periodic motion. This enables us to probe regions of the parameter space that are inaccessible in on-shell bosonic radiation. We apply our results to pulsar binaries with mediators that couple to muons and neutrinos. Using current data on binary period decays, we extract bounds on the parameters of such models.

    hep-phJHEP(2023)·3 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.