Multidifferential study of identified charged hadron distributions in ZZ-tagged jets in proton-proton collisions at s=\sqrt{s}=13 TeV

Jet fragmentation functions are measured for the first time in proton-proton collisions for charged pions, kaons, and protons within jets recoiling against a $Z$ boson. The charged-hadron distributions are studied longitudinally and transversely to the jet direction for jets with transverse momentum 20 $< p_{\textrm{T}} < 100$ GeV and in the pseudorapidity range $2.5 < \eta < 4$. The data sample was collected with the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.64 fb$^{-1}$. Triple differential distributions as a function of the hadron longitudinal momentum fraction, hadron transverse momentum, and jet transverse momentum are also measured for the first time. This helps constrain transverse-momentum-dependent fragmentation functions. Differences in the shapes and magnitudes of the measured distributions for the different hadron species provide insights into the hadronization process for jets predominantly initiated by light quarks.Comment: All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-013.html (LHCb public pages

Study of the B−→Λc+Λˉc−K−B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-} decay

The decay $B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-}$ is studied in proton-proton collisions at a center-of-mass energy of $\sqrt{s}=13$ TeV using data corresponding to an integrated luminosity of 5 $\mathrm{fb}^{-1}$ collected by the LHCb experiment. In the $\Lambda_{c}^+ K^{-}$ system, the $\Xi_{c}(2930)^{0}$ state observed at the BaBar and Belle experiments is resolved into two narrower states, $\Xi_{c}(2923)^{0}$ and $\Xi_{c}(2939)^{0}$, whose masses and widths are measured to be $$m(\Xi_{c}(2923)^{0}) = 2924.5 \pm 0.4 \pm 1.1 \,\mathrm{MeV}, \\ m(\Xi_{c}(2939)^{0}) = 2938.5 \pm 0.9 \pm 2.3 \,\mathrm{MeV}, \\ \Gamma(\Xi_{c}(2923)^{0}) = \phantom{000}4.8 \pm 0.9 \pm 1.5 \,\mathrm{MeV},\\ \Gamma(\Xi_{c}(2939)^{0}) = \phantom{00}11.0 \pm 1.9 \pm 7.5 \,\mathrm{MeV},$$ where the first uncertainties are statistical and the second systematic. The results are consistent with a previous LHCb measurement using a prompt $\Lambda_{c}^{+} K^{-}$ sample. Evidence of a new $\Xi_{c}(2880)^{0}$ state is found with a local significance of $3.8\,\sigma$, whose mass and width are measured to be $2881.8 \pm 3.1 \pm 8.5\,\mathrm{MeV}$ and $12.4 \pm 5.3 \pm 5.8 \,\mathrm{MeV}$, respectively. In addition, evidence of a new decay mode $\Xi_{c}(2790)^{0} \to \Lambda_{c}^{+} K^{-}$ is found with a significance of $3.7\,\sigma$. The relative branching fraction of $B^{-} \to \Lambda_{c}^{+} \bar{\Lambda}_{c}^{-} K^{-}$ with respect to the $B^{-} \to D^{+} D^{-} K^{-}$ decay is measured to be $2.36 \pm 0.11 \pm 0.22 \pm 0.25$, where the first uncertainty is statistical, the second systematic and the third originates from the branching fractions of charm hadron decays.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-028.html (LHCb public pages

Measurement of the ratios of branching fractions R(D∗)\mathcal{R}(D^{*}) and R(D0)\mathcal{R}(D^{0})

The ratios of branching fractions $\mathcal{R}(D^{*})\equiv\mathcal{B}(\bar{B}\to D^{*}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(\bar{B}\to D^{*}\mu^{-}\bar{\nu}_{\mu})$ and $\mathcal{R}(D^{0})\equiv\mathcal{B}(B^{-}\to D^{0}\tau^{-}\bar{\nu}_{\tau})/\mathcal{B}(B^{-}\to D^{0}\mu^{-}\bar{\nu}_{\mu})$ are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0 fb${ }^{-1}$ of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode $\tau^{-}\to\mu^{-}\nu_{\tau}\bar{\nu}_{\mu}$. The measured values are $\mathcal{R}(D^{*})=0.281\pm0.018\pm0.024$ and $\mathcal{R}(D^{0})=0.441\pm0.060\pm0.066$, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is $\rho=-0.43$. Results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the Standard Model.Comment: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-039.html (LHCb public pages

Chlamydia trachomatis, Neisseria gonorrhoeae and syphilis among men who have sex with men in Brazil

Submitted by Fábio Marques ([email protected]) on 2018-10-11T14:15:07Z No. of bitstreams: 1 Chlamydia trachomatis, Neisseria gonorrhoeae and syphilis_Beatriz_Grinsztejn_etal_INI_Lapclin-AIDS_2015.pdf: 515345 bytes, checksum: 52e2fe1300c0b35a97e8bc66b6d93924 (MD5)Approved for entry into archive by Regina Costa ([email protected]) on 2018-10-11T16:53:57Z (GMT) No. of bitstreams: 1 Chlamydia trachomatis, Neisseria gonorrhoeae and syphilis_Beatriz_Grinsztejn_etal_INI_Lapclin-AIDS_2015.pdf: 515345 bytes, checksum: 52e2fe1300c0b35a97e8bc66b6d93924 (MD5)Made available in DSpace on 2018-10-11T16:53:57Z (GMT). No. of bitstreams: 1 Chlamydia trachomatis, Neisseria gonorrhoeae and syphilis_Beatriz_Grinsztejn_etal_INI_Lapclin-AIDS_2015.pdf: 515345 bytes, checksum: 52e2fe1300c0b35a97e8bc66b6d93924 (MD5) Previous issue date: 2015Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.John Hopkins University. Division of Infectious Diseases. Baltimore, USA.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Laboratório de Pesquisa Clínica em DST/AIDS. Rio de Janeiro, RJ, Brasil.Sexually transmitted diseases (STD) are frequently asymptomatic and increase the likelihood of transmitting and acquiring HIV. In Brazil, the guidelines for STDs diagnosis and treatment are based on the syndromic approach. Nucleic acid amplification tests (NAAT) has been recommended as routine STDs screening in some countries, especially for men who have sex with men (MSM). Limited data are available about how to best define target groups for routine screening by NAATs within this population. We aimed to assess the prevalence of rectal and urethral Chlamydia trachomatis (CT) and Neisseria gonorrhoeae (NG) infections and syphilis, and the factors associated with having at least one STD among HIV-infected and uninfected MSM in Rio de Janeiro, Brazil

In situ FoxP3+ and IL-10 over-expression is associated with high grade anal lesions in HIV infected patients

Submitted by Alcina Frederica Nicol ([email protected]) on 2017-11-12T20:43:42Z No. of bitstreams: 1 FOX-ijcep0019868.pdf: 1341261 bytes, checksum: 188a212005045eeaaae4280385a30d59 (MD5)Approved for entry into archive by Raphael Rodrigues ([email protected]) on 2017-11-13T14:43:39Z (GMT) No. of bitstreams: 1 FOX-ijcep0019868.pdf: 1341261 bytes, checksum: 188a212005045eeaaae4280385a30d59 (MD5)Made available in DSpace on 2017-11-13T14:43:39Z (GMT). No. of bitstreams: 1 FOX-ijcep0019868.pdf: 1341261 bytes, checksum: 188a212005045eeaaae4280385a30d59 (MD5) Previous issue date: 2016Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Interdisciplinar de Pesquisas Médicas. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Saúde da Mulher, da Criança e do Adolescente Fernandes Figueira. Departamento de Patologia. Rio de Janeiro, RJ, Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Rio de Janeiro, RJ. Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Rio de Janeiro, RJ. Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Rio de Janeiro, RJ. Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Rio de Janeiro, RJ. Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Rio de Janeiro, RJ. Brasil.Fundação Oswaldo Cruz. Instituto Nacional de Infectologia Evandro Chagas. Rio de Janeiro, RJ. Brasil.Universidade Estácio de Sá. Departamento de Endodontia. Programa de pós graduação em odontologia. Rio de Janeiro, RJ, BrasilFundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Interdisciplinar de Pesquisas Médicas. Rio de Janeiro, RJ, Brasil.Instituto Nacional do Cancer. Divisão de Genética. Rio de Janeiro, RJ. Brasil.Comprehensive Cancer Center, Ohio State University, Columbus, Ohio, USA.Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Interdisciplinar de Pesquisas Médicas. Rio de Janeiro, RJ, Brasil.Human papillomavirus (HPV) is the main etiologic agent of lower genital tract cancers. The natural history of HPV infection and the immune response to HIV/HPV co-infection, particularly in the anal mucosa, is poorly understood. The aim was evaluate the in situ immune response in anorectal biopsies from HIV-infected patients. A total of 114 biopsies were analyzed by Tissue Micro-Array: 15 were from HIV-negative individuals with normal squamous epithelium and 99 from HIV-positive individuals (21 normal squamous epithelium, 39 with anal intra-epithelial lesion grade 1 and 39 with anal intra-epithelial lesion grade 2/3). PCR and sequencing were used to identify HPV DNA. Staining for CD4, CD8, Foxp3+, T-bet and IL-10 were analyzed via immunohistochemistry. HIV-positive patients with AIN 2/3 showed a lower number of CD4+ cells (< 50 cells/mm3) compared to HIV negative subjects (P = 0.01). HIV infected individuals showed a higher expression of FoxP3+ and IL-10 that correlated with the severity of the lesion (P = 0.002). A positive coefficient correlation was found between FoxP3+ and IL-10 (r = 0.34; P = 0.027). HPV DNA was detected in 93.4% (101/107) of the samples and the most common types were HPV 16 (26.9%), followed by HPV 6 (15.7%), HPV 59 (13%) and HPV 18 (10.2%). Our results showed a strong association between the increased T-reg cells and IL-10 expression in HIV-positive patients with AIN 2/3. HPV 16 was the most prevalent type. Our study suggests that the immune regulatory in situ profile may favor HPV persistence in HIV-positive individuals. Further in situ studies should be done in order to elucidate the development of anal cancer in HPV/HIV co-infected individuals