Unsupervised Quark/Gluon Jet Tagging With Poissonian Mixture Models.

The classification of jets induced by quarks or gluons is important for New Physics searches at high-energy colliders. However, available taggers usually rely on modeling the data through Monte Carlo simulations, which could veil intractable theoretical and systematical uncertainties. To significantly reduce biases, we propose an unsupervised learning algorithm that, given a sample of jets, can learn the SoftDrop Poissonian rates for quark- and gluon-initiated jets and their fractions. We extract the Maximum Likelihood Estimates for the mixture parameters and the posterior probability over them. We then construct a quark-gluon tagger and estimate its accuracy in actual data to be in the 0.65-0.7 range, below supervised algorithms but nevertheless competitive. We also show how relevant unsupervised metrics perform well, allowing for an unsupervised hyperparameter selection. Further, we find that this result is not affected by an angular smearing introduced to simulate detector effects for central jets. The presented unsupervised learning algorithm is simple; its result is interpretable and depends on very few assumptions.

Tratamiento quirúrgico en un hamartoma combinado de retina y epitelio pigmentario / Surgical treatment in combined hamartoma of the retina and retinal pigment epithelium

CASO CLÍNICO: Presentamos el caso de un paciente varón de 39 años, con un hamartoma combinado de retina y epitelio pigmentario de retina. El paciente refería disminución progresiva de la visión y empeoramiento de la metamorfopsia. Se realizó una vitrectomía con pelado de la membrana epirretiniana, consiguiendo una mejoría de la agudeza visual y de la metamorfopsia, así como de la arquitectura retiniana en la tomografía de coherencia óptica. DISCUSIÓN: Algunos pacientes seleccionados con hamartomas combinados de retina y epitelio pigmentario podrían beneficiarse de la realización de una vitrectomía

CASE REPORT: The case is presented of a 39 year-old man with a combined hamartoma of the retina and retinal pigment epithelium, who experienced progressive visual loss and worsening of metamorphopsia. The patient underwent vitrectomy and epiretinal component peeling, with improvement in visual acuity, metamorphopsia, and retinal architecture, assessed by optical coherence tomography. DISCUSSION: Selected patients with combined hamartomas of the retina and retinal pigment epithelium may benefit from surgical management

Surgical treatment in combined hamartoma of the retina and retinal pigment epithelium. / Tratamiento quirúrgico en un hamartoma combinado de retina y epitelio pigmentario.

CASE REPORT: The case is presented of a 39 year-old man with a combined hamartoma of the retina and retinal pigment epithelium, who experienced progressive visual loss and worsening of metamorphopsia. The patient underwent vitrectomy and epiretinal component peeling, with improvement in visual acuity, metamorphopsia, and retinal architecture, assessed by optical coherence tomography. DISCUSSION: Selected patients with combined hamartomas of the retina and retinal pigment epithelium may benefit from surgical management.

Síndrome de Churg-Strauss asociado con anticuerpos antifosfolipídicos en un paciente con vasculitis retiniana / Churg-Strauss syndrome associated with antiphospholipid antibodies in a patient with retinal vasculitis

CASO CLINICO: Presentamos el caso clínico de una mujer de 69 años, con una vasculitis retiniana unilateral. El estudio del caso mostró la presencia de asma, sinusitis con pólipos nasales, eosinofilia en sangre periférica, aumento de la velocidad de sedimentación, proteinuria y anticuerpos antifosfolipídicos. Los anticuerpos antineutrófilos citoplasmáticos fueron negativos. DISCUSIÓN: A pesar de la ausencia de anticuerpos antineutrófilos citoplasmáticos, se consideró el diagnóstico de un síndrome de Churg-Strauss, dadas las otras manifestaciones clínicas y de laboratorio, iniciándose un tratamiento con altas dosis de corticoides y anticoagulantes

CASE REPORT: We present the case of a 69-year-old woman with unilateral retinal vasculitis. Investigations showed asthma, rhinosinusitis, nasal polyposis, peripheral blood eosinophilia, increased sedimentation rate, proteinuria, and antiphospholipid antibodies. Anti-neutrophil cytoplasmic antibodies (ANCA) were negative. DISCUSSION: Although her anti-neutrophil cytoplasmatic antibody (ANCA) status was negative, taking into account the other clinical and laboratory features, retinal vasculitis was thought to be an ocular manifestation of Churg-Strauss syndrome. Treatment was started with high-dose corticosteroids and anticoagulant therapy

Churg-Strauss syndrome associated with antiphospholipid antibodies in a patient with retinal vasculitis. / Síndrome de Churg-Strauss asociado con anticuerpos antifosfolipídicos en un paciente con vasculitis retiniana.

CASE REPORT: We present the case of a 69-year-old woman with unilateral retinal vasculitis. Investigations showed asthma, rhinosinusitis, nasal polyposis, peripheral blood eosinophilia, increased sedimentation rate, proteinuria, and antiphospholipid antibodies. Anti-neutrophil cytoplasmic antibodies (ANCA) were negative. DISCUSSION: Although her anti-neutrophil cytoplasmatic antibody (ANCA) status was negative, taking into account the other clinical and laboratory features, retinal vasculitis was thought to be an ocular manifestation of Churg-Strauss syndrome. Treatment was started with high-dose corticosteroids and anticoagulant therapy.