Measurements of the production cross sections of prompt D0, D+, D*+,
Atomic dark matter is a simple but highly theoretically motivated possibility for an interacting dark sector that could constitute some or all of dark matter. We perform a comprehensive study of precision cosmological observables on minimal atomic dark matter, exploring for the first time the full parameter space of dark QED coupling and dark electron and proton masses (
- Award ID(s):
- 2112540
- PAR ID:
- 10546091
- Publisher / Repository:
- Journal of High Energy Physics
- Date Published:
- Journal Name:
- Journal of High Energy Physics
- Volume:
- 2023
- Issue:
- 10
- ISSN:
- 1029-8479
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
More Like this
-
A bstract ,$$ {\textrm{D}}_{\textrm{s}}^{+} $$ , and$$ {\Lambda}_{\textrm{c}}^{+} $$ charm hadrons at midrapidity in proton-proton collisions at$$ {\Xi}_{\textrm{c}}^{+} $$ = 13 TeV with the ALICE detector are presented. The D-meson cross sections as a function of transverse momentum ($$ \sqrt{s} $$ p T) are provided with improved precision and granularity. The ratios ofp T-differential meson production cross sections based on this publication and on measurements at different rapidity and collision energy provide a constraint on gluon parton distribution functions at low values of Bjorken-x (10− 5–10− 4). The measurements of ($$ {\Lambda}_{\textrm{c}}^{+} $$ ) baryon production extend the measured$$ {\Xi}_{\textrm{c}}^{+} $$ p Tintervals down top T= 0(3) GeV/c . These measurements are used to determine the charm-quark fragmentation fractions and the production cross section at midrapidity (|$$ \textrm{c}\overline{\textrm{c}} $$ y |< 0. 5) based on the sum of the cross sections of the weakly-decaying ground-state charm hadrons D0, D+, ,$$ {\textrm{D}}_{\textrm{s}}^{+} $$ ,$$ {\Lambda}_{\textrm{c}}^{+} $$ and, for the first time,$$ {\Xi}_{\textrm{c}}^0 $$ , and of the strongly-decaying J$$ {\Xi}_{\textrm{c}}^{+} $$ /ψ mesons. The first measurements of and$$ {\Xi}_{\textrm{c}}^{+} $$ fragmentation fractions at midrapidity are also reported. A significantly larger fraction of charm quarks hadronising to baryons is found compared to e+e$$ {\Sigma}_{\textrm{c}}^{0,++} $$ − and ep collisions. The production cross section at midrapidity is found to be at the upper bound of state-of-the-art perturbative QCD calculations.$$ \textrm{c}\overline{\textrm{c}} $$ -
A bstract A search for high-mass dimuon resonance production in association with one or more b quark jets is presented. The study uses proton-proton collision data collected with the CMS detector at the LHC corresponding to an integrated luminosity of 138 fb
− 1at a center-of-mass energy of 13 TeV. Model-independent limits are derived on the number of signal events with exactly one or more than one b quark jet. Results are also interpreted in a lepton-flavor-universal model with Z′ boson couplings to a bb quark pair (g b), an sb quark pair (g bδ bs), and any same-flavor charged lepton (g ℓ ) or neutrino pair (g ν ), with|g ν | =|g ℓ | . For a Z′ boson with a mass = 350 GeV (2 TeV) and$$ {m}_{{\textrm{Z}}^{\prime }} $$ |δ bs| < 0.25, the majority of the parameter space with 0.0057 <|g ℓ | < 0.35 (0.25 <|g ℓ | < 0.43) and 0.0079 < |g b | < 0.46 (0.34 < |g b | < 0.57) is excluded at 95% confidence level. Finally, constraints are set on a Z′ model with parameters consistent with low-energy b → sℓℓ measurements. In this scenario, most of the allowed parameter space is excluded for a Z′ boson with 350 < < 500 GeV, while the constraints are less stringent for higher$$ {m}_{{\textrm{Z}}^{\prime }} $$ hypotheses. This is the first dedicated search at the LHC for a high-mass dimuon resonance produced in association with multiple b quark jets, and the constraints obtained on models with this signature are the most stringent to date.$$ {m}_{{\textrm{Z}}^{\prime }} $$ -
A bstract The production of strange hadrons (
, Λ, Ξ$$ {\textrm{K}}_{\textrm{S}}^0 $$ ± , and Ω± ), baryon-to-meson ratios (Λ/ , Ξ$$ {\textrm{K}}_{\textrm{S}}^0 $$ / , and Ω$$ {\textrm{K}}_{\textrm{S}}^0 $$ / ), and baryon-to-baryon ratios (Ξ$$ {\textrm{K}}_{\textrm{S}}^0 $$ / Λ, Ω/ Λ, and Ω/ Ξ) associated with jets and the underlying event were measured as a function of transverse momentum (p T) in pp collisions at = 13 TeV and p Pb collisions at$$ \sqrt{s} $$ = 5$$ \sqrt{s_{\textrm{NN}}} $$ . 02 TeV with the ALICE detector at the LHC. The inclusive production of the same particle species and the corresponding ratios are also reported. The production of multi-strange hadrons, Ξ± and Ω± , and their associated particle ratios in jets and in the underlying event are measured for the first time. In both pp and p–Pb collisions, the baryon-to-meson and baryon-to-baryon yield ratios measured in jets differ from the inclusive particle production for low and intermediate hadronp T(0.6–6 GeV/c ). Ratios measured in the underlying event are in turn similar to those measured for inclusive particle production. In pp collisions, the particle production in jets is compared with Pythia 8 predictions with three colour-reconnection implementation modes. None of them fully reproduces the data in the measured hadronp Tregion. The maximum deviation is observed for Ξ± and Ω± which reaches a factor of about six. The event multiplicity dependence is further investigated in p−Pb collisions. In contrast to what is observed in the underlying event, there is no significant event-multiplicity dependence for particle production in jets. The presented measurements provide novel constraints on hadronisation and its Monte Carlo description. In particular, they demonstrate that the fragmentation of jets alone is insufficient to describe the strange and multi-strange particle production in hadronic collisions at LHC energies. -
A bstract Measurements of inclusive charged-particle jet production in pp and p-Pb collisions at center-of-mass energy per nucleon-nucleon collision
= 5$$ \sqrt{s_{\textrm{NN}}} $$ . 02 TeV and the corresponding nuclear modification factor are presented, using data collected with the ALICE detector at the LHC. Jets are reconstructed in the central rapidity region |$$ {R}_{\textrm{pPb}}^{\textrm{ch}\ \textrm{jet}} $$ η jet|< 0. 5 from charged particles using the anti-k Talgorithm with resolution parametersR = 0. 2, 0. 3, and 0. 4. Thep T-differential inclusive production cross section of charged-particle jets, as well as the corresponding cross section ratios, are reported for pp and p-Pb collisions in the transverse momentum range 10< $$ {p}_{\textrm{T},\textrm{jet}}^{\textrm{ch}} $$ < 140 GeV/c and 10< $$ {p}_{\textrm{T},\textrm{jet}}^{\textrm{ch}} $$ < 160 GeV/c , respectively, together with the nuclear modification factor in the range 10$$ {R}_{\textrm{pPb}}^{\textrm{ch}\ \textrm{jet}} $$ < $$ {p}_{\textrm{T},\textrm{jet}}^{\textrm{ch}} $$ < 140 GeV/c . The analysis extends thep Trange of the previously-reported charged-particle jet measurements by the ALICE Collaboration. The nuclear modification factor is found to be consistent with one and independent of the jet resolution parameter with the improved precision of this study, indicating that the possible influence of cold nuclear matter effects on the production cross section of charged-particle jets in p-Pb collisions at = 5$$ \sqrt{s_{\textrm{NN}}} $$ . 02 TeV is smaller than the current precision. The obtained results are in agreement with other minimum bias jet measurements available for RHIC and LHC energies, and are well reproduced by the NLO perturbative QCD Powheg calculations with parton shower provided by Pythia 8 as well as by Jetscape simulations. -
Abstract We investigate how cosmic web structures affect galaxy quenching in the IllustrisTNG (TNG100) cosmological simulations by reconstructing the cosmic web within each snapshot using the D
is Per SE framework. We measure the comoving distance from each galaxy with stellar mass to the nearest node (d node) and the nearest filament spine (d fil) to study the dependence of both the median specific star formation rate (〈sSFR〉) and the median gas fraction (〈f gas〉) on these distances. We find that the 〈sSFR〉 of galaxies is only dependent on the cosmic web environment atz < 2, with the dependence increasing with time. Atz ≤ 0.5, galaxies are quenched atd node≲ 1 Mpc, and have significantly suppressed star formation atd fil≲ 1 Mpc, trends driven mostly by satellite galaxies. Atz ≤ 1, in contrast to the monotonic drop in 〈sSFR〉 of galaxies with decreasingd nodeandd fil, galaxies—both centrals and satellites—experience an upturn in 〈sSFR〉 atd node≲ 0.2 Mpc. Much of this cosmic web dependence of star formation activity can be explained by an evolution in 〈f gas〉. Our results suggest that in the past ∼10 Gyr, low-mass satellites are quenched by rapid gas stripping in dense environments near nodes and gradual gas starvation in intermediate-density environments near filaments. At earlier times, cosmic web structures efficiently channeled cold gas into most galaxies. State-of-the-art ongoing spectroscopic surveys such as the Sloan Digital Sky Survey and DESI, as well as those planned with the Subaru Prime Focus Spectrograph, JWST, and Roman, are required to test our predictions against observations.