The evolution of the transverse-momentum dependent gluon distribution at small xx

International audienceUsing the colour dipole picture for photon-nucleus interactions at small $x$ together with the Color Glass Condensate (CGC) effective theory, we demonstrate that the next-to-leading (NLO) order corrections to the cross-section for the inclusive production of a pair of hard jets encode not only the JIMWLK evolution with decreasing $x$, but also the DGLAP evolution of the gluon distribution function and the CSS evolution of the gluon transverse momentum dependent (TMD) distribution. The emergent CSS equation takes the form of a rate equation describing the evolution of the dijet distribution in the transverse momentum imbalance $K_\perp$ when increasing the dijet relative momentum $P_\perp$. All three types of evolution become important when both $P_\perp$ and $K_\perp$ are much larger than the nuclear saturation momentum $Q_s(x)$ and we propose a framework which encompasses all of them. The solution to the JIMWLK equation provides the source term for the DGLAP evolution with increasing $K_\perp$, which in turn generates the initial condition for the CSS evolution with increasing $P_\perp$

Characterization of the optical model of the T2K 3D segmented plastic scintillator detector

International audienceThe magnetised near detector (ND280) of the T2K long-baseline neutrino oscillation experiment has been recently upgraded aiming to satisfy the requirement of reducing the systematic uncertainty from measuring the neutrinonucleus interaction cross section, which is the largest systematic uncertainty in the search for leptonic charge-parity symmetry violation. A key component of the upgrade is SuperFGD, a 3D segmented plastic scintillator detector made of approximately 2,000,000 optically-isolated 1 cm3 cubes. It will provide a 3D image of GeV neutrino interactions by combining tracking and stopping power measurements of final state particles with sub-nanosecond time resolution. The performance of SuperFGD is characterized by the precision of its response to charged particles as well as the systematic effects that might affect the physics measurements. Hence, a detailed Geant4 based optical simulation of the SuperFGD building block, i.e. a plastic scintillating cube read out by three wavelength shifting fibers, has been developed and validated with the different datasets collected in various beam tests. In this manuscript the description of the optical model as well as the comparison with data are reported

Commissioning of ThomX Compton source subsystems and demonstration of 1010^{10} X-rays/s

International audienceThomX is a compact x-ray source based on Compton scattering, installed at IJCLab (Laboratoire de physique des 2 infinis-Irène Joliot-Curie) in Orsay. The machine uses a small electron storage ring and an intense laser pulse stored in a high-finesse optical cavity. This article describes the various subsystems of the machine and their initial results of the commissioning, which began in mid-2021. This first commissioning phase led to the production of 10$^{10}$ x-rays/s with an on-axis energy of 45 keV. The main steps to be taken to reach the nominal flux are outlined at the end.ThomX est une source compacte de rayons X basée sur la diffusion Compton, installée à IJCLab (Laboratoire de physique des 2 infinis - Irène Joliot-Curie) à Orsay. La machine utilise un petit anneau de stockage et un laser impulsionnel intense stocké dans une cavité de haute finesse. Cet article décrit les différents sous-systèmes de la machine, et leurs premiers résultats lors de la mise en service, entamée mi-2021. Cette première phase de mise en service a débouché sur la production de 10$^{10}$ rayons X/s, avec une énergie sur l'axe de 45 keV. Les principales étapes requises pour atteindre le flux nominal sont soulignées en conclusion

Cost-minimization analysis of the GORTEC 2014-04 randomized phase II study of stereotactic ablative radiotherapy (SABR) or chemotherapy-SABR in oligometastatic head and neck cancer

International audiencePurposeThe randomized phase II GORTEC 2014–04 and French Head and Neck Intergroup study showed deeper deterioration of the quality of life (HRQoL) and dramatically higher severe toxicity rates with similar overall survival rates using chemo-SABR compared to SABR alone in oligometastatic head and neck cancer (HNSCC) patients. We evaluated the costs associated with SABR-alone versus chemo-SABR and their associated costs (transportation, hospitalizations, etc).Materials and Methods69 HNSCC patients with 1–3 oligometastases and a controlled primary were randomized from September 2015 to October 2022. HRQoL by the QLQ-C30, QLQ-HN35, descriptive EQ5D-3L and visual EQ-VAS self-rated questionnaires were completed for clinical benefit and economic utility appraisal. Direct medical treatment-related costs (radiotherapy, anticancer drugs, hospital stays, serious adverse event management, medical imaging, biological surveillance and medical transports) were analyzed from randomization until 12 months (M12, including per protocol and salvage treatments) or death. Utility index scores and deterioration rates were used. Based on equivalent outcomes, a cost-minimization analysis was performed.ResultsMedian EQ-5D-3L utility index scores were 0.84 at baseline and 0.87 at M12 for SABR-alone; corresponding to 0.85 and 0.57 for chemo-SABR. Rates of patients free of definitive EQ-VAS deterioration at M12 were 76.9 % and 63.8 % for SABR-alone and chemo-SABR. Mean quality-adjusted PFS was 12.1 and 11.0 months with SABR-alone and chemo-SABR. The mean total costs from the French Public health system perspective were €8,498 ± 3,599 for SABR-alone, and €48,034 ± 58,228 for chemo-SABR (p < 10−4). Sensitivity analyses confirmed cost savings around €35,000-€40,000 per patient using SABR-alone. Anticancer drugs and hospital stays were cost drivers. The economic burden increased by 269 ± 66 % with chemo-SABR compared to SABR-alone (p < 10−4).Conclusionsin addition to clinical benefits, SABR-alone appears as the least costly option (by a factor of 5) for the management of oligometastases from HNSCC

Observation of the open-charm tetraquark state Tcs0∗(2870)0T_{cs 0}^{*}(2870)^0 in the B−→D−D0KS0B^- \rightarrow D^- D^0 K_\mathrm{S}^0 decay

International audienceAn amplitude analysis of $B^-\rightarrow D^- D^0 K_\mathrm{S}^0$ decays is performed using proton-proton collision data, corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$, collected with the LHCb detector at center-of-mass energies of 7, 8, and 13$\mathrm{\,Te\kern -0.1em V}$. A resonant structure of spin-parity $0^+$ is observed in the $D^0 K_\mathrm{S}^0$ invariant-mass spectrum with a significance of $5.3\,\sigma$. The mass and width of the state, modeled with a Breit$-$Wigner lineshape, are determined to be $2883\pm11\pm6\mathrm{\,Me\kern -0.1em V\!/}c^2$ and $87_{-47}^{+22}\pm6\mathrm{\,Me\kern -0.1em V}$ respectively, where the first uncertainties are statistical and the second systematic. These properties and the quark content are consistent with those of the open-charm tetraquark state $T_{cs 0}^{*}(2870)^0$ observed previously in the $D^+ K^-$ final state of the $B^-\rightarrow D^- D^+ K^-$ decay. This result confirms the existence of the $T_{cs 0}^{*}(2870)^0$ state in a new decay mode. The $T_{cs1}^{*}(2900)^0$ state, reported in the $B^-\rightarrow D^- D^+ K^-$ decay, is also searched for in the $D^0 K_\mathrm{S}^0$ invariant-mass spectrum of the $B^- \rightarrow D^- D^0 K_\mathrm{S}^0$ decay, without finding evidence for it

Taming flavour violation in the Inverse Seesaw

International audienceThe Inverse Seesaw mechanism remains one of the most attractive explanations for the lightness of neutrino masses, allowing for natural low-scale realisations. We consider the prospects of a simple extension via 3 generations of sterile fermions - the so called ISS(3,3) - in what concerns numerous lepton flavour observables. In order to facilitate a connection between the Lagrangian parameters and low-energy data, we systematically develop new parametrisations of the Yukawa couplings. Relying on these new parametrisations to explore the parameter space, we discuss the complementary role of charged lepton flavour violation searches in dedicated facilities, as well as in lepton colliders (FCC-ee and $\mu$TRISTAN). Our results reveal the strong synergy of the different indirect searches in probing the distinct flavour sectors of the model. In particular, we show that in the absence of radiative decays $\ell_\alpha\to\ell_\beta\gamma$, sizeable rates for $Z$-penguin dominated observables could hint at a non-trivially mixed and non-degenerate heavy spectrum

Dark Energy Survey Year 3 results: simulation-based cosmological inference with wavelet harmonics, scattering transforms, and moments of weak lensing mass maps II. Cosmological results

International audienceWe present a simulation-based cosmological analysis using a combination of Gaussian and non-Gaussian statistics of the weak lensing mass (convergence) maps from the first three years (Y3) of the Dark Energy Survey (DES). We implement: 1) second and third moments; 2) wavelet phase harmonics; 3) the scattering transform. Our analysis is fully based on simulations, spans a space of seven $\nu w$CDM cosmological parameters, and forward models the most relevant sources of systematics inherent in the data: masks, noise variations, clustering of the sources, intrinsic alignments, and shear and redshift calibration. We implement a neural network compression of the summary statistics, and we estimate the parameter posteriors using a simulation-based inference approach. Including and combining different non-Gaussian statistics is a powerful tool that strongly improves constraints over Gaussian statistics (in our case, the second moments); in particular, the Figure of Merit $\textrm{FoM}(S_8, \Omega_{\textrm{m}})$ is improved by 70 percent ($\Lambda$CDM) and 90 percent ($w$CDM). When all the summary statistics are combined, we achieve a 2 percent constraint on the amplitude of fluctuations parameter $S_8 \equiv \sigma_8 (\Omega_{\textrm{m}}/0.3)^{0.5}$, obtaining $S_8 = 0.794 \pm 0.017$ ($\Lambda$CDM) and $S_8 = 0.817 \pm 0.021$ ($w$CDM). The constraints from different statistics are shown to be internally consistent (with a $p$-value>0.1 for all combinations of statistics examined). We compare our results to other weak lensing results from the DES Y3 data, finding good consistency; we also compare with results from external datasets, such as \planck constraints from the Cosmic Microwave Background, finding statistical agreement, with discrepancies no greater than $<2.2\sigma$

On holographic confining QFTs on AdS

International audienceHolographic quantum field theories that confine in flat space, are considered on a fixed AdS space. The space of holographic solutions for such theories is constructed and three types of regular solutions are found. Theories with two AdS boundaries provide interfaces between two confining theories. Theories with a single AdS boundary correspond to ground states of a single confining theory on AdS. We find solutions without a boundary, whose interpretation is not obvious. There is also a special limiting solution that oscillates an infinite number of times around the UV fixed point. We analyze in detail the holographic dictionary for the one-boundary solutions and compute the free energy. No (quantum) phase transitions are found when we change the curvature. We find an infinite number of pure vev solutions, but no CFT solution without a vev. We also compute the free energy of the interface solutions. We find that the product saddle points have always lower free energy than the connected solutions. This implies that in such interfaces, normalized cross-correlators vanish exponentially in $N_c^2$

Measurement of inclusive and differential cross sections of single top quark production in association with a W boson in proton-proton collisions at s\sqrt{s} = 13.6 TeV

International audienceThe first measurement of the inclusive and normalised differential cross sections of single top quark production in association with a W boson in proton-proton collisions at a centre-of-mass energy of 13.6 TeV is presented. The data were recorded with the CMS detector at the LHC in 2022, and correspond to an integrated luminosity of 34.7 fb$^{-1}$. The analysed events contain one muon and one electron in the final state. For the inclusive measurement, multivariate discriminants exploiting the kinematic properties of the events are used to separate the signal from the dominant top quark-antiquark production background. A cross section of 82.3 $\pm$ 2.1 (stat) ${}^{+9.9}_{-9.7}$ (syst) $\pm$ 3.3 (lumi) pb is obtained, consistent with the predictions of the standard model. A fiducial region is defined according to the detector acceptance to perform the differential measurements. The resulting differential distributions are unfolded to particle level and show good agreement with the predictions at next-to-leading order in perturbative quantum chromodynamics

The dynamics of spherically symmetric black holes in scalar-Gauss-Bonnet gravity with a Ricci coupling

International audienceWe study the dynamics of spherically symmetric black holes in scalar Gauss-Bonnet gravity with an additional coupling between the scalar field and the Ricci scalar using non-linear simulations that employ excision. In this class of theories, black holes possess hair if they lie in a specific mass range, in which case they exhibit a finite-area singularity, unlike general relativity. Our results show that the Ricci coupling can mitigate the loss of hyperbolicity in spherical evolution with black hole initial data. Using excision can enlarge the parameter space for which the system remains well-posed, as one can excise the elliptic region that forms inside the horizon. Furthermore, we explore a possible relation between the loss of hyperbolicity and the formation of the finite-area singularity inside the horizon. We find that the location of the singularity extracted from the static analysis matches the location of the sonic line well. Finally, when possible, we extract the monopolar quasi-normal modes and the time scale of the linear tachyonic instability associated with scalarization. We also check our results by utilizing a continued fraction analysis and supposing linear perturbations of the static solutions