El género Amanita Pers. ex Hooker en la provincia de León

Twenty three taxa of genus Amanita in León province (NW Spain) are quoted. An identification key of all these taxa is provided, as well as their provincial distribution, ecology and their relation with the vegetation series.Se citan 23 taxa del género Amanita en la provincia de León (Noroeste de España). Se acompaña una clave para su determinación, su distribución provincial, ecología, así como su relación con las series de vegetación

New Racemic and Single Enantiopure Hybrid Scorpionate/Cyclopentadienyl Magnesium and Zinc Initiators for the Stereoselective ROP of Lactides

The preparation of the first racemic bis­(pyrazol-1-yl)­methane-based NNCp-donor hybrid scorpionate/cyclopentadienyl magnesium and zinc complexes [Mg­(R)­(κ²-η⁵-NNCp)] (<b>1</b>–<b>6</b>) [NNCp = bpztcp, R = Me (<b>1</b>), Et (<b>2</b>), CH₂SiMe₃ (<b>3</b>); bpzpcp, R = Me (<b>4</b>), Et (<b>5</b>), CH₂SiMe₃ (<b>6</b>)] and [Zn­(R)­(κ²-η¹-NNCp)] (<b>7</b>–<b>12</b>) [NNCp = bpztcp, R = Me (<b>7</b>), Et (<b>8</b>), CH₂SiMe₃ (<b>9</b>); bpzpcp, R = Me (<b>10</b>), Et (<b>11</b>), CH₂SiMe₃ (<b>12</b>)] has been carried out by the reaction of the corresponding racemic NNCp-H-donor scorpionate pro-ligands with Grignard reagents RMgCl, after deprotonation with ⁿBuLi, or directly with ZnR₂. The resulting alkyl magnesium complexes (<b>1</b>–<b>6</b>) have been employed in a protonolysis reaction with 2,6-dimethylphenol to yield the aryloxide magnesium complexes [Mg­(OAr)­(κ²-η⁵-NNCp)] (<b>13</b> and <b>14</b>) [NNCp = bpztcp (<b>13</b>), bpzpcp (<b>14</b>)]. Subsequently, the enantiopure scorpionate pro-ligand (<i>R</i>,<i>R</i>)-bpmycpH (<b>16a</b>) {bpmycpH = 1-{2,2-bis­(3,5-dimethyl-1<i>H</i>-pyrazol-1-yl)-1-(2<i>R</i>)-2-[(1<i>R</i>)-6,6-[3.1.1]-2-hepten-2-yl]­ethyl}­cyclopentadiene} and (<i>R</i>,<i>R</i>)-bpmycp′H (<b>16b</b>) {bpmycp′H = 2-{2,2-bis­(3,5-dimethyl-1<i>H</i>-pyrazol-1-yl)-1-(2<i>R</i>)-2-[(1<i>R</i>)-6,6-[3.1.1]-2-hepten-2-yl]­ethyl}­cyclopentadiene} reacted with RMgCl (after addition of ⁿBuLi) or with ZnR₂ to give the single enantiopure complexes [Mg­(R)­(κ²-η⁵-<i>R</i>,<i>S</i>-bpmycp)] (<b>17</b>–<b>19</b>) (R = Me (<b>17</b>), Et (<b>18</b>), CH₂SiMe₃ (<b>19</b>)) {<i>R</i>,<i>S</i>-bpmycp = 2-{2,2-bis­(3,5-dimethyl-1<i>H</i>-pyrazol-1-yl)-1-(2<i>S</i>)-2-[(1<i>R</i>)-6,6-[3.1.1]-2-hepten-2-yl]­ethyl}­cyclopentadienyl} and [Zn­(R)­(κ²-η¹-<i>R</i>,<i>S</i>-bpmycp)] (<b>20</b>–<b>22</b>) (R = Me (<b>20</b>), Et (<b>21</b>), CH₂SiMe₃ (<b>22</b>)). The structures of these complexes were elucidated by ¹H and ¹³C­{¹H} NMR spectroscopy, and the X-ray crystal structures of <b>2</b>, <b>3</b>, <b>7</b> and <b>21</b> were also established. These racemic and single enantiopure complexes <b>1</b>–<b>3</b>, <b>5</b>–<b>9</b>, <b>11</b>–<b>14</b>, <b>19</b>, and <b>21</b> can act as single-component initiators for the ring-opening polymerization of <i>rac</i>-lactide under mild conditions. Microstructural analysis of poly­(<i>rac</i>-lactide)­s revealed that, whereas the myrtenal substituent on the single enantiomerically pure initiator <b>21</b> exerts an appreciable influence on the degree of stereoselectivity to produce isotactic-enriched poly­(lactide)­s with a <i>P</i>_i value up to 0.77, the racemic mixtures of initiators impart more discrete levels of heteroselectivity in the production of PLAs, with a <i>P</i>_s value of 0.72

Search for high-mass resonances decaying to a jet and a Lorentz-boosted resonance in proton-proton collisions at $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}

Physics letters / B 832, 137263 (2022). doi:10.1016/j.physletb.2022.137263 Published by North-Holland Publ., Amsterda

Two-particle Bose-Einstein correlations and their Lévy parameters in PbPb collisions at sNN\sqrt{s_\mathrm{NN}} = 5.02 TeV

Two-particle Bose-Einstein momentum correlation functions are studied for charged-hadron pairs in lead-lead collisions at a center-of-mass energy per nucleon pair of $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV. The data sample, containing 4.27$\times10^{9}$ minimum bias events corresponding to an integrated luminosity of 0.607 nb$^{-1}$, was collected by the CMS experiment in 2018. The experimental results are discussed in terms of a L\'evy-type source distribution. The parameters of this distribution are extracted as functions of particle pair average transverse mass and collision centrality. These parameters include the L\'evy index or shape parameter ($\alpha$), the L\'evy scale parameter ($R$), and the correlation strength parameter ($\lambda$). The source shape, characterized by $\alpha$, is found to be neither Cauchy nor Gaussian, implying the need for a full L\'evy analysis. Similarly to what was previously found for systems characterized by Gaussian source radii, a hydrodynamical scaling is observed for the L\'evy $R$ parameter. The $\lambda$ parameter is studied in terms of the core-halo model.Comment: Submitted to Physical Review C. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-21-011 (CMS Public Pages

Evaluation of a quality improvement intervention to reduce anastomotic leak following right colectomy (EAGLE): pragmatic, batched stepped-wedge, cluster-randomized trial in 64 countries

Background Anastomotic leak affects 8 per cent of patients after right colectomy with a 10-fold increased risk of postoperative death. The EAGLE study aimed to develop and test whether an international, standardized quality improvement intervention could reduce anastomotic leaks. Methods The internationally intended protocol, iteratively co-developed by a multistage Delphi process, comprised an online educational module introducing risk stratification, an intraoperative checklist, and harmonized surgical techniques. Clusters (hospital teams) were randomized to one of three arms with varied sequences of intervention/data collection by a derived stepped-wedge batch design (at least 18 hospital teams per batch). Patients were blinded to the study allocation. Low- and middle-income country enrolment was encouraged. The primary outcome (assessed by intention to treat) was anastomotic leak rate, and subgroup analyses by module completion (at least 80 per cent of surgeons, high engagement; less than 50 per cent, low engagement) were preplanned. Results A total 355 hospital teams registered, with 332 from 64 countries (39.2 per cent low and middle income) included in the final analysis. The online modules were completed by half of the surgeons (2143 of 4411). The primary analysis included 3039 of the 3268 patients recruited (206 patients had no anastomosis and 23 were lost to follow-up), with anastomotic leaks arising before and after the intervention in 10.1 and 9.6 per cent respectively (adjusted OR 0.87, 95 per cent c.i. 0.59 to 1.30; P = 0.498). The proportion of surgeons completing the educational modules was an influence: the leak rate decreased from 12.2 per cent (61 of 500) before intervention to 5.1 per cent (24 of 473) after intervention in high-engagement centres (adjusted OR 0.36, 0.20 to 0.64; P &lt; 0.001), but this was not observed in low-engagement hospitals (8.3 per cent (59 of 714) and 13.8 per cent (61 of 443) respectively; adjusted OR 2.09, 1.31 to 3.31). Conclusion Completion of globally available digital training by engaged teams can alter anastomotic leak rates. Registration number: NCT04270721 (http://www.clinicaltrials.gov)

Extracting the speed of sound in the strongly interacting matter created in ultrarelativistic lead-lead collisions at the LHC

International audienceUltrarelativistic nuclear collisions create a strongly interacting state of hot and dense quark-gluon matter that exhibits a remarkable collective flow behavior with minimal viscous dissipation. To gain deeper insights into its intrinsic nature and fundamental degrees of freedom, we extracted the speed of sound in this medium created using lead-lead (PbPb) collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data were recorded by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 0.607 nb$^{-1}$. The measurement is performed by studying the multiplicity dependence of the average transverse momentum of charged particles emitted in head-on PbPb collisions. Our findings reveal that the speed of sound in this matter is nearly half the speed of light, with a squared value of 0.241 $\pm$ 0.002 (stat) $\pm$ 0.016 (syst) in natural units. The effective medium temperature, estimated using the mean transverse momentum, is 219 $\pm$ 8 (syst) MeV. The measured squared speed of sound at this temperature aligns precisely with predictions from lattice quantum chromodynamic (QCD) calculations. This result provides a stringent constraint on the equation of state of the created medium and direct evidence for a deconfined QCD phase being attained in relativistic nuclear collisions

A deep neural network to search for new long-lived particles decaying to jets

International audienceA tagging algorithm to identify jets that are significantly displaced from the proton-proton (pp) collision region in the CMS detector at the LHC is presented. Displaced jets can arise from the decays of long-lived particles (LLPs), which are predicted by several theoretical extensions of the standard model. The tagger is a multiclass classifier based on a deep neural network, which is parameterised according to the proper decay length $\mathrm{c}\tau_0$ of the LLP. A novel scheme is defined to reliably label jets from LLP decays for supervised learning. Samples of pp collision data, recorded by the CMS detector at a centre-of-mass energy of 13 TeV, and simulated events are used to train the neural network. Domain adaptation by backward propagation is performed to improve the simulation modelling of the jet class probability distributions observed in pp collision data. The potential performance of the tagger is demonstrated with a search for long-lived gluinos, a manifestation of split supersymmetric models. The tagger provides a rejection factor of 10 000 for jets from standard model processes, while maintaining an LLP jet tagging efficiency of 30-80% for gluinos with 1 mm $\leq$ $c\tau_0$ $\leq$ 10 m. The expected coverage of the parameter space for split supersymmetry is presented

{Search for direct production of GeV-scale resonances decaying to a pair of muons in proton-proton collisions at s \sqrt{s} = 13 TeV}

A search for direct production of low-mass dimuon resonances is performed using = 13 TeV proton-proton collision data collected by the CMS experiment during the 2017–2018 operation of the CERN LHC with an integrated luminosity of 96.6 fb−1. The search exploits a dedicated high-rate trigger stream that records events with two muons with transverse momenta as low as 3 GeV but does not include the full event information. The search is performed by looking for narrow peaks in the dimuon mass spectrum in the ranges of 1.1–2.6 GeV and 4.2–7.9 GeV. No significant excess of events above the expectation from the standard model background is observed. Model-independent limits on production rates of dimuon resonances within the experimental fiducial acceptance are set. Competitive or world’s best limits are set at 90% confidence level for a minimal dark photon model and for a scenario with two Higgs doublets and an extra complex scalar singlet (2HDM+S). Values of the squared kinetic mixing coefficient ε2 in the dark photon model above 10−6 are excluded over most of the mass range of the search. In the 2HDM+S, values of the mixing angle sin(θH) above 0.08 are excluded over most of the mass range of the search with a fixed ratio of the Higgs doublets vacuum expectation tan β = 0.5

Search for supersymmetry in hadronic final states with missing transverse energy using the variables αT and b-quark multiplicity in pp collisions at √s = 8 TeV

Submitted by Vitor Silverio Rodrigues ([email protected]) on 2014-05-27T11:30:34Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:48:49Z : No. of bitstreams: 1 2-s2.0-84883824987.pdf: 1540579 bytes, checksum: be6bbff5192436d9fcdbc367ffd1650e (MD5) Made available in DSpace on 2014-05-27T11:30:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-09-01 An inclusive search for supersymmetric processes that produce final states with jets and missing transverse energy is performed in pp collisions at a centre-of-mass energy of 8 TeV. The data sample corresponds to an integrated luminosity of 11.7 fb-1 collected by the CMS experiment at the LHC. In this search, a dimensionless kinematic variable, αT, is used to discriminate between events with genuine and misreconstructed missing transverse energy. The search is based on an examination of the number of reconstructed jets per event, the scalar sum of transverse energies of these jets, and the number of these jets identified as originating from bottom quarks. No significant excess of events over the standard model expectation is found. Exclusion limits are set in the parameter space of simplified models, with a special emphasis on both compressed-spectrum scenarios and direct or gluino-induced production of third-generation squarks. For the case of gluino-mediated squark production, gluino masses up to 950-1125 GeV are excluded depending on the assumed model. For the direct pair-production of squarks, masses up to 450 GeV are excluded for a single light first- or second-generation squark, increasing to 600 GeV for bottom squarks. © 2013 CERN for the benefit of the CMS collaboration. CERN, Geneva Yerevan Physics Institute, Yerevan Institut für Hochenergiephysik der OeAW, Wien National Centre for Particle and High Energy Physics, Minsk Universiteit Antwerpen, Antwerpen Vrije Universiteit Brussel, Brussel Université Libre de Bruxelles, Bruxelles Ghent University, Ghent Université Catholique de Louvain, Louvain-la-Neuve Université de Mons, Mons Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro Universidade do Estado do Rio de Janeiro, Rio de Janeiro Universidade Estadual Paulista, São Paulo Universidade Federal do ABC, São Paulo Institute for Nuclear Research and Nuclear Energy, Sofia University of Sofia, Sofia Institute of High Energy Physics, Beijing State Key Laboratory of Nuclear Physics and Technology Peking University, Beijing Universidad de Los Andes, Bogota Technical University of Split, Split University of Split, Split Institute Rudjer Boskovic, Zagreb University of Cyprus, Nicosia Charles University, Prague Academy of Scientific Research and Technology of the Arab Republic of Egypt Egyptian Network of High Energy Physics, Cairo National Institute of Chemical Physics and Biophysics, Tallinn Department of Physics University of Helsinki, Helsinki Helsinki Institute of Physics, Helsinki Lappeenranta University of Technology, Lappeenranta DSM/IRFU CEA/Saclay, Gif-sur-Yvette Laboratoire Leprince-Ringuet, Ecole Polytechnique IN2P3-CNRS, Palaiseau Institut Pluridisciplinaire Hubert Curien, Universite de Strasbourg, Universite de Haute Alsace Mulh CNRS/IN2P3, Strasbourg CNRS-IN2P3, Institut de Physique Nucléaire de Lyon Université de Lyon, Université Claude Bernard Lyon 1, Villeurbanne Institute of High Energy Physics and Informatization Tbilisi State University, Tbilisi I. Physikalisches Institut RWTH Aachen University, Aachen III. Physikalisches Institut A RWTH Aachen University, Aachen III. Physikalisches Institut B RWTH Aachen University, Aachen Deutsches Elektronen-Synchrotron, Hamburg University of Hamburg, Hamburg Institut für Experimentelle Kernphysik, Karlsruhe Institute of Nuclear and Particle Physics (INPP) NCSR Demokritos, Aghia Paraskevi University of Athens, Athens University of Ioánnina, Ioánnina KFKI Research Institute for Particle and Nuclear Physics, Budapest Institute of Nuclear Research ATOMKI, Debrecen University of Debrecen, Debrecen Panjab University, Chandigarh University of Delhi, Delhi Saha Institute of Nuclear Physics, Kolkata Bhabha Atomic Research Centre, Mumbai Tata Institute of Fundamental Research - EHEP, Mumbai Tata Institute of Fundamental Research - HECR, Mumbai Institute for Research in Fundamental Sciences (IPM), Tehran INFN Sezione di Bari, Bari Università di Bari, Bari Politecnico di Bari, Bari INFN Sezione di Bologna, Bologna Università di Bologna, Bologna INFN Sezione di Catania, Catania Università di Catania, Catania INFN Sezione di Firenze, Firenze Università di Firenze, Firenze INFN Laboratori Nazionali di Frascati, Frascati INFN Sezione di Genova, Genova Università di Genova, Genova INFN Sezione di Milano-Bicocca, Milano Università di Milano-Bicocca, Milano INFN Sezione di Napoli, Napoli Università di Napoli 'Federico II', Napoli Università della Basilicata (Potenza), Napoli Università G. 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