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1. Analysis of Donor Biopsy Tissue Samples at the Time of Kidney Transplant

Author: Qatar National Research Fund
Published: 2024

2. Therapeutic Plantar Electrical Stimulation Intervention During Hemodialysis to Improve Balance and Mobility

Author: Qatar National Research Fund and Baylor College of Medicine
Published: 2022

3. Assessment of carbon footprint in Qatar's electricity sector: A comparative analysis across various building typologies

Author: Qatar National Research Fund, Qatar University, Abulibdeh, Ammar, Jawarneh, Rana, Al-Awadhi, Talal, Abdullah, Meshal, Abulibdeh, Rawan, El Kenawy, Ahmed M., Qatar National Research Fund, Qatar University, Abulibdeh, Ammar, Jawarneh, Rana, Al-Awadhi, Talal, Abdullah, Meshal, Abulibdeh, Rawan, and El Kenawy, Ahmed M.
Abstract: Carbon footprint (CF) estimation has emerged as an integral tool for greenhouse gas (GHG) management, providing direction for emission reduction strategies and verification processes. Since capturing the full lifecycle emissions of goods and services at the city level can be methodologically challenging due to the fact that cities have multiple sources of emissions (e.g. transportation, waste, buildings), our study focused on evaluating the carbon footprint of various types of urban buildings across six sectors. This evaluation was conducted in one of the most rapidly urbanized cities in the Middle East, Doha City, Qatar, and was based on electricity consumption data from 2017 to 2020. Using multiregional input–output life cycle assessment (MRIO-LCA) and hot/coldspot analysis, this study identified CF emission spatiotemporal patterns and the major buildings responsible for the highest emissions. The results indicated that residential villas and the commercial sector had the highest electricity consumption and steady increases in CF emissions during the study period, whereas hotels had the lowest annual electricity consumption among all sectors. The study also identified significant CF emission hotspots from Doha residential buildings in the southwestern and northeastern areas. In contrast, the CF hotspots from commercial buildings were concentrated in the industrial area in the southern part of the city and in the West Bay area in the eastern part. Overall, the findings of this study provide important policy implications and a comprehensive assessment of dynamic changes in CF emissions from different building types.
Published: 2024

4. Prediction of Cardiovascular Events in Vulnerable Patients Following Acute Coronary Syndrome

Author: Qatar National Research Fund and Amir Lerman, M.D., Principal Investigator
Published: 2015

5. ¿Qué fue del niño dormido? Consecuencias de la reducción de los plazos máximos de duración del embarazo en la jurisprudencia y la legislación islámicas contemporáneas

Author: Qatar National Research Fund, Serrano Ruano, Delfina [0000-0003-1155-9267], Serrano Ruano, Delfina, Qatar National Research Fund, Serrano Ruano, Delfina [0000-0003-1155-9267], and Serrano Ruano, Delfina
Abstract: [EN] This article takes as its starting point the results obtained in two previous works published in specialized journals in the field of Islamic and gender studies (Serrano-Ruano, 2018, 2022). The main argument of the article is that in contemporary Islamic legal systems, a partial and biased incorporation of modern scientific knowledge on embryology, gynecology and genetics on the one hand while maintaining the criminalization of extra-marital relations (zinà), on the other, has led to increased vulnerability of certain groups of people such as single mothers and their children, or women who become pregnant after being widowed, divorced or abandoned by their husbands. Meanwhile, the written record seems to indicate that prior to the 20th century, the admission of extremely long pregnancy durations encapsulated in the doctrine of the dormant embryo was quite effective in protecting women in the situation described above against a charge of zinā and prevented that their children were considered illegitimate and deprived of all kinds of rights. To develop this argument, we first review classical Islamic jurisprudence as well as the legislation and judicial practice of a number of Islamic-majority countries, on the legal duration of pregnancy and paternal filiation. Next, we go on to analyze the social and legal impact that modern genetics and medicine are having on these issues. Ultimately, the work aims to go beyond the strict limits of Islamic studies and facilitate the reception of its results among specialists in gender studies from other disciplines lacking the necessary skills to read Arabic primary and secondary sources., [ES] Este artículo toma como punto de partida resultados obtenidos en dos trabajos previos publicados en revistas especializadas del ámbito de la islamología y de los estudios de género e islam (Serrano-Ruano, 2018, 2022). El principal argumento del artículo es que una incorporación parcial y sesgada del conocimiento científico moderno sobre embriología, ginecología y genética por parte de los sistemas legales islámicos contemporáneos, al tiempo que se mantiene en ellos la penalización de las relaciones extra-matrimoniales (zinà), ha acrecentado la vulnerabilidad de determinados grupos de personas como las madres solteras y sus hijos, o las mujeres que se quedan embarazadas tras enviudar, ser repudiadas o ser abandonadas por sus maridos. Mientras tanto, el registro escrito parece indicar que con anterioridad al siglo XX, la admisión de duraciones del embarazo muy prolongadas –recogidas en la doctrina del niño dormido– fue bastante efectiva para proteger a las mujeres en la situación descrita anteriormente contra una acusación de zinā e impedir que sus hijos fueran considerados ilegítimos y privados de todo tipo de derechos. Para desarrollar este argumento, en primer lugar, se pasa revista a la jurisprudencia islámica clásica, así como a la legislación y a la práctica judicial de una serie de países de mayoría islámica acerca de la duración legal del embarazo y la filiación paterna. A continuación, se analiza el impacto social y jurídico que la genética y la medicina modernas están teniendo en el tratamiento de estas cuestiones. En última instancia el trabajo aspira a traspasar los límites estrictos de la islamología y de los estudios de género e islam, y facilitar la recepción de sus resultados entre especialistas procedentes de otras disciplinas y sin capacidad para leer fuentes primarias o bibliografía en árabe.
Published: 2023

6. Global Challenges Global Challenges Research Article Open Access A Preliminary Assessment of Global CO2: Spatial Patterns, Temporal Trends, and Policy Implications

Author: Qatar National Research Fund, Qatar University, Qatar National Library, Kenawy, A. El, Al-Awadhi, Talal, Abdullah, Meshal, Jawarneh, Rana, Abulibdeh, Ammar, Qatar National Research Fund, Qatar University, Qatar National Library, Kenawy, A. El, Al-Awadhi, Talal, Abdullah, Meshal, Jawarneh, Rana, and Abulibdeh, Ammar
Abstract: This study offers a comprehensive analysis of the distribution, evolution, and driving factors of CO2 emissions from 1990 to 2016 at multiple spatial scales. Utilizing 26 indicators encompassing various facets of CO2 emissions, it is employed principal component analysis (PCA) and empirical orthogonal functions (EOFs) to identify the dominant characteristics of global CO2 emissions. This model retained three core components, accounting for 93% of the global CO2 variation, reflecting emission trajectories and associated economic metrics, such as Gross domestic product (GDP). The analysis differentiated the effects of these components based on countries' economic standings. Using a novel aggregated index, significant national contributors to global CO2 emissions are pinpointed. Notably, the leading contributors are found among developed nations (e.g., the United States, Canada, Japan), Gulf states (e.g., Saudi Arabia, Qatar), and emerging economies (e.g., China, Brazil, Mexico). Furthermore, these results highlight that shifts in global CO2 emissions over the past 30 years are predominantly influenced by factors like industrial emissions and GDP. Results also demonstrate a distinct relationship between a country's CO2 emissions and its physical and socioeconomic factors. Specifically, the nation's coastline length, population density in coastal regions, and the diversity of its climatic conditions significantly influence its carbon footprint.
Published: 2023

7. Factors Associated with Family Consent to Organ Donation in Qatar: Results from a Household Survey

Author: Qatar National Research Fund (QNRF), Qatar sponsored the study under National Priority Research Proposal (NPRP-7-965-3-247), Singh, Rajvir, Varughes, Betsy, El-Menyar, Ayman, Shahbal, Saad, Maslamani, Yousuf Al, Salam, Amar, Thani, Hassan Al, Qatar National Research Fund (QNRF), Qatar sponsored the study under National Priority Research Proposal (NPRP-7-965-3-247), Singh, Rajvir, Varughes, Betsy, El-Menyar, Ayman, Shahbal, Saad, Maslamani, Yousuf Al, Salam, Amar, and Thani, Hassan Al
Abstract: Background: Family consent and organ donors rates are co-linear to each other. The low consent rate can be influenced by socioeconomic and behavioral factors in the population. This study aimed to assess the influence of sociodemographic and behavioral factors on family consent for organ donation in the household population.Subjects dan Method: This is a secondary data analysis of the cross-sectional research design of 1044 household participants conducted in Qatar on organ donation between October and November 2016. A two-stage systematic random sampling was applied to collect data. The dependent variable was family consent. The independent variables were demographic and behavioral factors such as knowledge, attitude, intention, and beliefs about organ donation. Data were collected using household survey Questionnaire and analysed using Student t-tests (unpaired), chi-square tests, and multivariate logistic regression analysis. C-statistics was applied to see discriminate accury of the developed regression model for family consent.Results: Attitude (aOR= 1.73; 95%CI= 1.28 to 2.34; p= 0.001) and Intention (aOR= 7.50; 95%CI= 4.04 to 13.92; p= 0.001) factors were significantly associated to family consent to increase organ donation registration whereas; control belief (aOR= 0.74; 95%CI= 0.55 to 0.99; p= 0.050) was negatively associated to family consent. Knowledge (aOR= 1.63; 95%CI= 0.55 to 4.80; p= 0.380), behavioral belief (aOR= 1.11; 95%CI= 0.77 to 1.61; p= 0.580), heard organ donation (aOR= 1.12; 95%CI= 0.71 to 1.76; p= 0.630), registered for organ donation (aOR= 1.11; 95%CI= 0.50 to 2.46; p= 0.800), and donated any organ/blood/tissue (aOR= 1.63; 95%CI= 0.55 to 4.80; p= 0.380) factors were not statistically significant to family consent to increase organ donation registration.Conclusion: Attitude and intention can increase family consent to organ donation registration.Keywords: Family consent, intention, attitude, knowledge, organ donation.Correspondence: Rajvir S
Published: 2022

8. The Duration of Pregnancy in Contemporary Islamic Jurisprudence (fiqh) and Legislation: Tradition, Adaptation to Modern Medicine and (In)consequences

Author: Qatar National Research Fund, Serrano Ruano, Delfina [0000-0003-1155-9267 ], Serrano Ruano, Delfina, Qatar National Research Fund, Serrano Ruano, Delfina [0000-0003-1155-9267 ], and Serrano Ruano, Delfina
Abstract: This article deals with assessments by a number of contemporary Sunni fiqh experts on the legal duration of pregnancy. Most of them strive to demonstrate that classical jurisprudence (fiqh) and modern medicine are perfectly compatible, despite the fact that the former contemplates gestational periods far longer than nine months. Also, they make proposals for national legislative bodies to best accommodate medical evidence to shari`a’s ethical and legal standards. In this way, they legitimize the drastic shortening of the legal duration of pregnancy that had already taken place in the family codes of most Muslim majority countries in order to adapt the Islamic jurisprudence on which these codes are avowedly based to modern medical knowledge. In this specific legal change case-study, legislation appears to have drawn jurisprudence rather than the reverse. The adoption of the medical duration of pregnancy affects such extremely sensitive issues like the criminalization of non-marital sexual intercourse and the denial of paternal filiation to the resulting offspring. As long as the latter two fields are not revised accordingly, the contemporary fiqh and legislation on the matter will seem flawed since their implementation leaves women and their children deprived from legal protections they used to have under the corresponding classical jurisprudence in the pre-modern period.
Published: 2022

9. Petrographic analysis of ceramics from Murwab, an early Islamic site in Qatar

Author: Qatar National Research Fund, Albert Reckitt Fund, Carvajal López, José C., Guerin, Alexandrine, Alexandrine, Qatar National Research Fund, Albert Reckitt Fund, Carvajal López, José C., Guerin, Alexandrine, and Alexandrine
Abstract: Murwab is one of the most important early Islamic archaeological villages in the Arabian Peninsula and the Persian Gulf, and one of the best-known. Excavated since the 1950s, the site has yielded a complete pottery assemblage which allows the site to be dated from the late eighth to the late ninth century AD. This paper presents an analysis of the ceramics of Murwab. The analysis is undertaken on a selection of 134 pottery sherds of common ware/‘kitchen’ ware without glaze and encompasses a petrographic study and elemental analysis using wavelength dispersive X-ray fluorescence spectrometry (WDXRF). The results of the petrographic analysis and some preliminary thoughts on the chemical analysis are discussed in the text. Twelve ceramic fabrics have been detected in the assemblage studied. The composition of the fabrics allows some preliminary suggestions about provenance to be drawn: none of the fabrics was locally made in Qatar and most of them seem to come from Mesopotamia, eastern Arabia, and southern Iran. The technology of the ceramics reveals an approach to the manufacture of common wares that is characteristic of the Upper and Central Gulf (corresponding roughly to the Gulf coast west of the Musandam Peninsula, including Khuzestan and Bushehr in Iran). It is not known when this technological approach started, but it does not seem to be documented in the Bronze Age.
Published: 2022

10. Benefits, Motivations, and Challenges of International Collaborative Research: A Sociology of Science Case Study

Author: Qatar National Research Fund (NPRP Grant No. 5-1021-5-159) [sponsor], Dusdal, Jennifer, Powell, Justin J W, Qatar National Research Fund (NPRP Grant No. 5-1021-5-159) [sponsor], Dusdal, Jennifer, and Powell, Justin J W
Abstract: Contemporary science is marked by expanding, diverse forms of teamwork. Collaboration across organizational and cultural boundaries extends the possibilities of discovery. International collaborative research projects can provide findings beyond what one team could achieve alone. Motivated to grow their scientific network and maintain existing relationships, researchers increasingly collaborate, despite often unrecognized costs, since such projects are challenging to manage and carry out. Rarely studied in-depth and longitudinally, researcher perspectives are crucial to better understand the dynamics of durable collaboration networks. Thus, this retrospective, longitudinal case study of a sociology of science project applies the novel method of autoethnography to examine teamwork benefits, motivations, and challenges. Key challenges found include spatial distance and differences of culture, language, and career stage. This study, spanning North America, Europe, the Middle East, and East Asia, focused on collaborators’ characteristics and evolving perceptions of team dynamics over a decade.
Published: 2021

11. Taxonomic study of Mesomeloe coelatus (Reiche & Saulcy, 1857) (Coleoptera: Meloidae: Meloini), with the description of an overlooked new species

Author: European Commission, Qatar National Research Fund, Ministerio de Ciencia, Innovación y Universidades (España), Sánchez-Vialas, Alberto, Ruiz, José L., García-París, Mario, European Commission, Qatar National Research Fund, Ministerio de Ciencia, Innovación y Universidades (España), Sánchez-Vialas, Alberto, Ruiz, José L., and García-París, Mario
Abstract: A new species of the genus Mesomeloe (Meloidae) is described from Qatar on the north-eastern coast of the Arabian Peninsula. Mesomeloe ottomerkli sp. nov., which is currently only known from the type locality, was previously identified as Meloe (Mesomeloe) coelatus. Both the morphological and molecular variability of M. coelatus across its wide distribution range are studied to determine the level of congruence between the morphological and genetic differentiation of M. coelatus and the new species. Mesomeloe ottomerkli is distinguishable from all other congeneric species in various traits: it presents a body tegument and appendages that are black in colour and shiny in appearance; an elytral surface absent of impressed longitudinal shallow ridges; a pronotal surface absent of depressed areas and longitudinal midline; and a pronotal base that is slightly arcuate. In addition, males of M. ottomerkli have antennae that gradually widen towards the apex; protarsomeres with a brush patch of yellowish setae on the ventral surface of the first two segments; genitalia in which the gonostyli, in lateral view, become slenderer towards the apex and an aedeagus that is relatively wide and rounded in the distal portion. The distribution records of M. coelatus are also updated and summarized.
Published: 2021

12. Long term patterns of nomadic and sedentary settlement in the crowded desert of north-west Qatar

Author: Qatar National Research Fund, Carvajal López, José C., Qatar National Research Fund, and Carvajal López, José C.
Abstract: [EN] This paper aims to discuss some aspects about mobility and temporality of settlements, and in particular of dwelling spaces in Qatar with the data obtained in an archaeological survey carried out between 2015 and 2019 in the northwest of the country, the Crowded Desert Project (CDP). The paper starts with the theoretical underpinnings that make the study of nomadic and sedentary societies in the Middle East so different to European rural societies and that guided the design of the CDP. It then goes on to describe the geographical and historical particularities of the study area. A discussion on how narratives of resilience and narratives of change can be used in the discussion of the remains of dwellings follows. Finally, the paper concludes with a reflection on the agency of nomads, frequently overlooked as factors in explanations of nomadic and sedentary cycles in favour of systemic factors like climatic or economic changes. Without underplaying these factors, it is possible to conceive nomadic agency as a much more influential and proactive reason for changes or resilience in lifestyle., [FR] Cet article vise à discuter certains aspects archéologiques concernant la mobilité et la temporalité des colonies (et notamment des habitations) au Qatar grâce aux données obtenues lors du Projet du Désert Peuplé (CDP) entre 2015 et 2019 dans le nord-ouest du pays. L’article commence avec les bases théoriques qui rendent l’étude des sociétés nomades et sédentaires du Moyen-Orient si différentes des sociétés européennes rurales, ce qui a servi de guide pour le CDP. Il comprend ensuite une description géographique et historique des particularités de la zone étudiée. Ensuite, une discussion à propos de la résilience ou du changement des habitations est introduite dans l’interprétation des vestiges. Et pour conclure, une analyse de la répartition des nomades, trop souvent ignorée dans l’interprétation des cycles nomades et sédentaires en faveur des facteurs climatiques ou économiques. Sans ignorer ces facteurs, il est possible de concevoir cette répartition des nomades comme beaucoup plus importante et jouant un rôle actif contribuant au changement ou à la continuité d’un certain mode de vie., [DE] In diesem Artikel werden einige Aspekte der Mobilität und Zeitlichkeit von Siedlungen, insbesondere von Wohnstätten in Katar erörtert. Grundlage sind Daten, die durch das Crowded Dessert Project (CDP) erhoben wurden, einem zwischen 2015 und 2019 im Nordwesten des Landes entwickelten archäologischen Survey. Der Artikel beginnt mit einer theoretischen Teil, in dem die Erforschung von nomadischen und sesshaften Gesellschaften im Nahen Osten im Gegensatz zur Erforschung europäisch-ländlichen Gesellschaften deutlich gemacht wird und der in das Design des CDP einleitet. Anschließend werden die geographischen und historischen Besonderheiten des Forschungsgebietes beschrieben. Darauf folgt eine Erörterung wie Narrative von Resilienz und Wandel in der Diskussion über die archäologischen Befunde verwendet werden können. Der Artikel endet mit einer Betrachtung zur 'Agency' der Nomaden, die häufig als Erklärung für nomadische und sesshafte Zyklen zugunsten von systemischen Faktoren wie klimatische oder wirtschaftliche Veränderungen übersehen wird. Ohne diese Faktoren zu unterschätzen, besteht die Möglichkeit 'Agency' als einen viel einflussreicheren und proaktiveren Grund für Veränderung und Resilienz zu verstehen.
Published: 2021

13. Fine-Grained Analysis of Language Varieties and Demographics

Author: Universitat Politècnica de València. Departamento de Sistemas Informáticos y Computación - Departament de Sistemes Informàtics i Computació, Carnegie Mellon University, Qatar National Research Fund, Rangel, Francisco, Rosso, Paolo, Zaghouani, Wajdi, Charfi, Anis, Universitat Politècnica de València. Departamento de Sistemas Informáticos y Computación - Departament de Sistemes Informàtics i Computació, Carnegie Mellon University, Qatar National Research Fund, Rangel, Francisco, Rosso, Paolo, Zaghouani, Wajdi, and Charfi, Anis
Abstract: [EN] The rise of social media empowers people to interact and communicate with anyone anywhere in the world. The possibility of being anonymous avoids censorship and enables freedom of expression. Nevertheless, this anonymity might lead to cybersecurity issues, such as opinion spam, sexual harassment, incitement to hatred or even terrorism propaganda. In such cases, there is a need to know more about the anonymous users and this could be useful in several domains beyond security and forensics such as marketing, for example. In this paper, we focus on a fine-grained analysis of language varieties while considering also the authors¿ demographics. We present a Low-Dimensionality Statistical Embedding method to represent text documents. We compared the performance of this method with the best performing teams in the Author Profiling task at PAN 2017. We obtained an average accuracy of 92.08% versus 91.84% for the best performing team at PAN 2017. We also analyse the relationship of the language variety identification with the authors¿ gender. Furthermore, we applied our proposed method to a more fine-grained annotated corpus of Arabic varieties covering 22 Arab countries and obtained an overall accuracy of 88.89%. We have also investigated the effect of the authors¿ age and gender on the identification of the different Arabic varieties, as well as the effect of the corpus size on the performance of our method.
Published: 2020

14. Author Profiling Tracks at FIRE

Author: Universitat Politècnica de València. Departamento de Sistemas Informáticos y Computación - Departament de Sistemes Informàtics i Computació, CARNEGIE MELLON UNIVERSITY, Qatar National Research Fund, Rosso, Paolo, Rangel Pardo, Francisco Manuel, Universitat Politècnica de València. Departamento de Sistemas Informáticos y Computación - Departament de Sistemes Informàtics i Computació, CARNEGIE MELLON UNIVERSITY, Qatar National Research Fund, Rosso, Paolo, and Rangel Pardo, Francisco Manuel
Abstract: [EN] Benchmarking activities are vital for fostering research and addressing new challenging problems. During the last 10 years of the FIRE initiative we have been involved in the organization of more than ten tracks, with the aim of the creation of new resources in several languages that were made available to the research community. This allowed to compare the new several approaches on the same datasets. In this chapter we will focus on the description of three author profiling tracks, on their data creation as well as the results analysis.
Published: 2020

15. University vs. Research Institute? The Dual Pillars of German Science Production, 1950–2010

Author: Qatar National Research Fund (NPRP Grant No. 5-1021-5-159) [sponsor], Dusdal, Jennifer, Powell, Justin J W, Baker, David, Fu, Yuan Chih, Shamekhi, Yahya, Stock, Manfred, Qatar National Research Fund (NPRP Grant No. 5-1021-5-159) [sponsor], Dusdal, Jennifer, Powell, Justin J W, Baker, David, Fu, Yuan Chih, Shamekhi, Yahya, and Stock, Manfred
Abstract: The world’s third largest producer of scientific research, Germany, is the origin of the research university and the independent, extra-university research institute. Its dual-pillar research policy differentiates these organizational forms functionally: universities specialize in advanced research-based teaching; institutes specialize intensely on research. Over the past decades this policy affected each sector differently: while universities suffered a lingering “legitimation crisis,” institutes enjoyed deepening “favored sponsorship”—financial and reputational advantages. Universities led the nation’s reestablishment of scientific prominence among the highly competitive European and global science systems after WWII. But sectoral analysis of contributions to science, technology, engineering, mathematics, and medical and health journal publications (1950–2010) finds that Germany’s small to medium-sized independent research institutes have made significant, growing contributions, particularly in publishing in higher impact journals proportionally more than their size. Simultaneously—despite dual-pillar policy implications—the university sector continues to be absolutely and relatively successful; not eclipsed by the institutes. Universities have consistently produced two-thirds of the nation’s publications in the highest quality journals since at least 1980 and have increased publications at a logarithmic rate; higher than the international mean. Indeed, they led Germany into the global mega-science style of production. Contrary to assumed benefits of functional differentiation, our results indicate that relative to their size, each sector has produced approximately similar publication records. While institutes have succeeded, the larger university sector, despite much less funding growth, has remained fundamental to German science production. Considering these findings, we discuss the future utility of the dual-pillar policy.
Published: 2020

16. Germany’s Science Production Engines: Research Universities and Institutes Competing for Research Funding, 1950–2010

Author: Department of Social Sciences > Institute of Education & Society (InES) [research center], Qatar National Research Fund (NPRP 5-1021-5-159) [sponsor], Dusdal, Jennifer, Department of Social Sciences > Institute of Education & Society (InES) [research center], Qatar National Research Fund (NPRP 5-1021-5-159) [sponsor], and Dusdal, Jennifer
Published: 2020

17. Why is Germany not embracing the Humboldtian university?

Author: Education, Culture, Cognition & Society (ECCS) > Institute of Education & Society (InES) [research center], Qatar National Research Fund (QNRF) [sponsor], Baker, David, Dusdal, Jennifer, Powell, Justin J W, Stock, Manfred, Education, Culture, Cognition & Society (ECCS) > Institute of Education & Society (InES) [research center], Qatar National Research Fund (QNRF) [sponsor], Baker, David, Dusdal, Jennifer, Powell, Justin J W, and Stock, Manfred
Abstract: Why is Germany not embracing the Humboldtian university? The focus on conducting research in independent institutes is holding the country back, say four academics.
Published: 2020

18. Circulating tumor cells for comprehensive and multiregional non-invasive genetic characterization of multiple myeloma

Author: Centro de Investigación Biomédica en Red Cáncer (España), Instituto de Salud Carlos III, Cancer Research UK, Asociación Española Contra el Cáncer, European Commission, Ministerio de Ciencia e Innovación (España), European Research Council, International Myeloma Foundation, Qatar National Research Fund, Leukemia Research Foundation, Multiple Myeloma Research Foundation, Garcés, Juan José, Bretones, Gabriel, Burgos, Leire, Valdes-Mas, Rafael, Puig, Noemi, Cedena, Maria-Teresa, Alignani, Diego, Rodríguez, Idoia, Álvarez Puente, Diana, García Álvarez, Miguel, Goicoechea, Ibai, Rodríguez, Sara, Calasanz, Mª Jose, Agirre, Xavier, Flores-Montero, Juan, Sanoja-Flores, Luzalba, Rodríguez-Otero, Paula, Ríos, Rafael, Martínez-López, Joaquín, Millacoy, Pamela, Palomera, Luis, Orbe, Rafael del, Pérez-Montaña, Albert, Omri, Halima El, Prósper, Felipe, Mateos, Maria Victoria, Rosiñol, Laura, Bladé, Joan, Lahuerta, Juan José, Orfao, Alberto, López-Otín, Carlos, Miguel, Jesus F. San, Paiva, Bruno, Centro de Investigación Biomédica en Red Cáncer (España), Instituto de Salud Carlos III, Cancer Research UK, Asociación Española Contra el Cáncer, European Commission, Ministerio de Ciencia e Innovación (España), European Research Council, International Myeloma Foundation, Qatar National Research Fund, Leukemia Research Foundation, Multiple Myeloma Research Foundation, Garcés, Juan José, Bretones, Gabriel, Burgos, Leire, Valdes-Mas, Rafael, Puig, Noemi, Cedena, Maria-Teresa, Alignani, Diego, Rodríguez, Idoia, Álvarez Puente, Diana, García Álvarez, Miguel, Goicoechea, Ibai, Rodríguez, Sara, Calasanz, Mª Jose, Agirre, Xavier, Flores-Montero, Juan, Sanoja-Flores, Luzalba, Rodríguez-Otero, Paula, Ríos, Rafael, Martínez-López, Joaquín, Millacoy, Pamela, Palomera, Luis, Orbe, Rafael del, Pérez-Montaña, Albert, Omri, Halima El, Prósper, Felipe, Mateos, Maria Victoria, Rosiñol, Laura, Bladé, Joan, Lahuerta, Juan José, Orfao, Alberto, López-Otín, Carlos, Miguel, Jesus F. San, and Paiva, Bruno
Abstract: Multiple myeloma (MM) patients undergo repetitive bone marrow (BM) aspirates for genetic characterization. Circulating tumor cells (CTCs) are detectable in peripheral blood (PB) of virtually all MM cases and are prognostic, but their applicability for noninvasive screening has been poorly investigated. Here, we used next-generation flow (NGF) cytometry to isolate matched CTCs and BM tumor cells from 53 patients and compared their genetic profile. In eight cases, tumor cells from extramedullary (EM) plasmacytomas were also sorted and whole-exome sequencing was performed in the three spatially distributed tumor samples. CTCs were detectable by NGF in the PB of all patients with MM. Based on the cancer cell fraction of clonal and subclonal mutations, we found that ~22% of CTCs egressed from a BM (or EM) site distant from the matched BM aspirate. Concordance between BM tumor cells and CTCs was high for chromosome arm-level copy number alterations (≥95%) though not for translocations (39%). All high-risk genetic abnormalities except one t(4;14) were detected in CTCs whenever present in BM tumor cells. Noteworthy, ≥82% mutations present in BM and EM clones were detectable in CTCs. Altogether, these results support CTCs for noninvasive risk-stratification of MM patients based on their numbers and genetic profile.
Published: 2020

19. The dawn of the Islamic era? The excavation of Yughbī in the Crowded Desert of Qatar

Author: Qatar National Research Fund, Carvajal López, José C., Roberts, Kirk, Morabito, Laura, Rees, Gareth, Stremke, Frank, Marsh, Anke, Freire-Lista, David, Carter, Robert, Abdullah Al-Naimi, Faisal, Qatar National Research Fund, Carvajal López, José C., Roberts, Kirk, Morabito, Laura, Rees, Gareth, Stremke, Frank, Marsh, Anke, Freire-Lista, David, Carter, Robert, and Abdullah Al-Naimi, Faisal
Abstract: This paper introduces the main results of the excavation at the site of Yughbī during the last season of fieldwork of The Crowded Desert Project in the north-west of Qatar between March and April 2018. While the area of Yughbī was occupied for a long period of time, this paper focuses on a small number of stone buildings that dated mainly to the Umayyad period (AD 661–750), but also with reference to a more extended occupation that may be dated as early as the late Sasanian-Rāshidūn caliphate period (AD 498–661), and perhaps even earlier, to the early ‘Abbāsid period (c. AD 750–900). The Umayyad phase includes stone buildings that served as a permanent or semi-permanent base for a nomadic group in the process of sedentarization, or recently settled at the site. The finds of pottery, glass, metals, and other materials indicate that the community living at the site was well integrated within a wider landscape that included economic interests in the desert and the sea, and even long-distance connections.
Published: 2020

20. Islamic Heritage in Three Peninsulas

Author: Qatar National Research Fund, Carvajal López, José C., Živković, Jelena, Aljawabra, Alkindi, Lababidi, Rim, Qatar National Research Fund, Carvajal López, José C., Živković, Jelena, Aljawabra, Alkindi, and Lababidi, Rim
Abstract: This text is a reflection about the development of Islamic heritage in three different peninsulas where Islam has played an important role in the past: Qatar, Iberia, and the Balkans. The selection of these three spaces responds to the experience and academic specialization of the authors. There is a necessary simplification of the themes discussed due to the wide amount of information that has been used in the text, which includes a wide variety of approaches from different regions, languages, and traditions of scholarship. The aim of this exercise is to offer a comparative perspective that shows the complications and chances inherent to the definition of Islamic heritage beyond the limits of given communities and territories.
Published: 2020

21. Conducting Research on the World’s Changing Mediascape: Principles and Practices

Author: Qatar National Research Fund, Pavlik, John V., Dennis, Everette E., Mersey, Rachel Davis, Gengler, Justin, Qatar National Research Fund, Pavlik, John V., Dennis, Everette E., Mersey, Rachel Davis, and Gengler, Justin
Abstract: As digital technology sweeps across the globe, bringing far-reaching changes to the media environment and beyond, international research on the nature and impact of these changes is essential. This commentary situates media research within the broader flow of knowledge and offers a critical perspective on the principles and practices that should guide that research to maximize its potential contribution to both knowledge and to the public.
Published: 2019

22. Enhanced catalytic activity of Ni on η-Al2O3 and ZSM-5 on addition of ceria zirconia for the partial oxidation of methane

Author: Qatar National Research Fund, Osman, Ahmed I., Meudal, Jonathan, Laffir, Fathima R., Thompson, Jillian, Rooney, David, Qatar National Research Fund, Osman, Ahmed I., Meudal, Jonathan, Laffir, Fathima R., Thompson, Jillian, and Rooney, David
Abstract: peer-reviewed, Nickel supported on η-Al2O3 and ZSM-5(80) catalysts with and without the addition of ceria-zirconia, were prepared by co-precipitation and wet impregnation methods and used for the low temperature catalytic partial oxidation of methane (CPOM). The catalysts were tested under reaction temperatures of between 400 and 700 °C with a WHSV of 63,000 mL g−1 h−1. The activity of the catalyst was found to be dependent on the support and preparation method. The optimum catalyst composition of those tested was 10% Ni on 25%CeO2-ZrO2/ZSM-5(80), prepared by co-precipitation, where the reaction reached equilibrium conversion at 400 °C (T50% < 400 °C), which is one of the lowest temperatures reported to date. Further increases in temperature led to improved selectivity to CO reaching 60% at 600 °C. Although the observed kinetics were found to be controlled by strong adsorption of CO at lower temperature, this was an equilibrium limitation with longer time on stream experiments showing no decrease in the catalyst activity over 25 h at 400 °C, ACCEPTED, peer-reviewed
Published: 2019

23. IDAT@FIRE2019: Overview of the Track on Irony Detection in Arabic Tweets

Author: Universitat Politècnica de València. Departamento de Sistemas Informáticos y Computación - Departament de Sistemes Informàtics i Computació, Generalitat Valenciana, Qatar National Research Fund, Ghanem, Bilal, Karoui, Jihen, Benamara, Farah, Moriceau, Véronique, Rosso, Paolo, Universitat Politècnica de València. Departamento de Sistemas Informáticos y Computación - Departament de Sistemes Informàtics i Computació, Generalitat Valenciana, Qatar National Research Fund, Ghanem, Bilal, Karoui, Jihen, Benamara, Farah, Moriceau, Véronique, and Rosso, Paolo
Abstract: [EN] This overview paper describes the first shared task on irony detection for the Arabic language. The task consists of a binary classification of tweets as ironic or not using a dataset composed of 5,030 Arabic tweets about different political issues and events related to the Middle East and the Maghreb. Tweets in our dataset are written in Modern Standard Arabic but also in different Arabic language varieties including Egypt, Gulf, Levantine and Maghrebi dialects. Eighteen teams registered to the task among which ten submitted their runs. The methods of participants ranged from feature-based to neural networks using either classical machine learning techniques or ensemble methods. The best performing system achieved F-score value of 0.844, showing that classical feature-based models outperform the neural ones.
Published: 2019

24. Overview of the Track on Author Profiling and Deception Detection in Arabic

Author: Universitat Politècnica de València. Departamento de Sistemas Informáticos y Computación - Departament de Sistemes Informàtics i Computació, Generalitat Valenciana, Qatar National Research Fund, Rangel, Francisco, Rosso, Paolo, Charfi, Anis, Zaghouani, Wajdi, Ghanem, Bilal, Sánchez-Junquera, Javier, Universitat Politècnica de València. Departamento de Sistemas Informáticos y Computación - Departament de Sistemes Informàtics i Computació, Generalitat Valenciana, Qatar National Research Fund, Rangel, Francisco, Rosso, Paolo, Charfi, Anis, Zaghouani, Wajdi, Ghanem, Bilal, and Sánchez-Junquera, Javier
Abstract: [EN] This overview presents the Author Profiling and Deception Detection in Arabic (APDA) shared task at PAN@FIRE 2019. Two have been the main aims of this years task: i) to profile the age, gender and native language of a Twitter user; ii) to determine whether an Arabic text is deceptive or not in two different genres: Twitter and news headlines. For this purpose we have created three corpora in Arabic. Altogether, the approaches of 13 participants are evaluated.
Published: 2019

25. Search for supersymmetry in proton-proton collisions at 13 TeV in final states with jets and missing transverse momentum

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, Vizán, J., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vizán, J.
Abstract: Results are reported from a search for supersymmetric particles in the final state with multiple jets and large missing transverse momentum. The search uses a sample of proton-proton collisions at s = 13 TeV collected with the CMS detector in 2016–2018, corresponding to an integrated luminosity of 137 fb, representing essentially the full LHC Run 2 data sample. The analysis is performed in a four-dimensional search region defined in terms of the number of jets, the number of tagged bottom quark jets, the scalar sum of jet transverse momenta, and the magnitude of the vector sum of jet transverse momenta. No significant excess in the event yield is observed relative to the expected background contributions from standard model processes. Limits on the pair production of gluinos and squarks are obtained in the framework of simplified models for supersymmetric particle production and decay processes. Assuming the lightest supersymmetric particle to be a neutralino, lower limits on the gluino mass as large as 2000 to 2310 GeV are obtained at 95% confidence level, while lower limits on the squark mass as large as 1190 to 1630 GeV are obtained, depending on the production scenario.
Published: 2019

26. Search for vector-like quarks in events with two oppositely charged leptons and jets in proton-proton collisions at √s = 13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search for the pair production of heavy vectorlike partners T and B of the top and bottom quarks has been performed by the CMS experiment at the CERN LHC using proton-proton collisions at √s = 13 TeV. The data sample was collected in 2016 and corresponds to an integrated luminosity of 35.9fb. Final states studied for TT production include those where one of the T quarks decays via T → tZ and the other via T → bW, tZ, or tH, where H is a Higgs boson. For the BB case, final states include those where one of the B quarks decays via B → bZ and the other B → tW, bZ, or bH. Events with two oppositely charged electrons or muons, consistent with coming from the decay of a Z boson, and jets are investigated. The number of observed events is consistent with standard model background estimations. Lower limits at 95% confidence level are placed on the masses of the T and B quarks for a range of branching fractions. Assuming 100% branching fractions for T → tZ, and B → bZ, T and B quark mass values below 1280 and 1130 GeV, respectively, are excluded. 7copy; CERN for the benefit of the CMS collaboration 2019.
Published: 2019

27. Search for supersymmetry in events with a photon, jets, b -jets, and missing transverse momentum in proton–proton collisions at 13 Te

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search for supersymmetry is presented based on events with at least one photon, jets, and large missing transverse momentum produced in proton–proton collisions at a center-of-mass energy of 13Te. The data correspond to an integrated luminosity of 35.9fb-1 and were recorded at the LHC with the CMS detector in 2016. The analysis characterizes signal-like events by categorizing the data into various signal regions based on the number of jets, the number of b -tagged jets, and the missing transverse momentum. No significant excess of events is observed with respect to the expectations from standard model processes. Limits are placed on the gluino and top squark pair production cross sections using several simplified models of supersymmetric particle production with gauge-mediated supersymmetry breaking. Depending on the model and the mass of the next-to-lightest supersymmetric particle, the production of gluinos with masses as large as 2120Ge and the production of top squarks with masses as large as 1230Ge are excluded at 95% confidence level.
Published: 2019

28. Search for pair-produced three-jet resonances in proton-proton collisions at s =13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search has been performed for pair-produced resonances decaying into three jets. The proton-proton collision data used for this analysis were collected with the CMS detector in 2016 at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 35.9 fb-1. The mass range from 200 to 2000 GeV is explored in four separate mass regions. The observations show agreement with standard model expectations. The results are interpreted within the framework of R-parity violating SUSY, where pair-produced gluinos decay to a six quark final state. Gluino masses below 1500 GeV are excluded at 95% confidence level. An analysis based on data with multijet events reconstructed at the trigger level extends the reach to masses as low as 200 GeV. Improved analysis techniques have led to enhanced sensitivity, allowing the most stringent limits to date to be set on gluino pair production.
Published: 2019

29. Search for supersymmetric partners of electrons and muons in proton–proton collisions at s=13TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search for direct production of the supersymmetric (SUSY) partners of electrons or muons is presented in final states with two opposite-charge, same-flavour leptons (electrons and muons), no jets, and large missing transverse momentum. The data sample corresponds to an integrated luminosity of 35.9 fb of proton–proton collisions at s=13TeV, collected with the CMS detector at the LHC in 2016. The search uses the M variable, which generalises the transverse mass for systems with two invisible objects and provides a discrimination against standard model backgrounds containing W bosons. The observed yields are consistent with the expectations from the standard model. The search is interpreted in the context of simplified SUSY models and probes slepton masses up to approximately 290, 400, and 450 GeV, assuming right-handed only, left-handed only, and both right- and left-handed sleptons (mass degenerate selectrons and smuons), and a massless lightest supersymmetric particle. Limits are also set on selectrons and smuons separately. These limits show an improvement on the existing limits of approximately 150 GeV.
Published: 2019

30. Search for the production of W±W±W events at s =13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, Vizán, J., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vizán, J.
Abstract: A search for the production of events containing three W bosons predicted by the standard model is reported. The search is based on a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the CMS experiment at the CERN LHC and corresponding to a total integrated luminosity of 35.9 fb-1. The search is performed in final states with three leptons (electrons or muons), or with two same-charge leptons plus two jets. The observed (expected) significance of the signal for W±W±W production is 0.60 (1.78) standard deviations, and the ratio of the measured signal yield to that expected from the standard model is 0.34-0.34+0.62. Limits are placed on three anomalous quartic gauge couplings and on the production of massive axionlike particles.
Published: 2019

31. Search for supersymmetry in events with a photon, a lepton, and missing transverse momentum in proton-proton collisions at √s=13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: Results of a search for supersymmetry are presented using events with a photon, an electron or muon, and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 35.9 fb of proton-proton collisions at s=13 TeV, produced by the LHC and collected with the CMS detector in 2016. Theoretical models with gauge-mediated supersymmetry breaking predict events with photons in the final state, as well as electroweak gauge bosons decaying to leptons. Searches for events with a photon, a lepton, and missing transverse momentum are sensitive probes of these models. No excess of events is observed beyond expectations from standard model processes. The results of the search are interpreted in the context of simplified models inspired by gauge-mediated supersymmetry breaking. These models are used to derive upper limits on the production cross sections and set lower bounds on masses of supersymmetric particles. Gaugino masses below 930 GeV are excluded at the 95% confidence level in a simplified model with electroweak production of a neutralino and chargino. For simplified models of gluino and squark pair production, gluino masses up to 1.75 TeV and squark masses up to 1.43 TeV are excluded at the 95% confidence level.
Published: 2019

32. Search for pair production of vectorlike quarks in the fully hadronic final state

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, Vizán, J., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vizán, J.
Abstract: The results of two searches for pair production of vectorlike T or B quarks in fully hadronic final states are presented, using data from the CMS experiment at a center-of-mass energy of 13 TeV. The data were collected at the LHC during 2016 and correspond to an integrated luminosity of 35.9 fb-1. A cut-based analysis specifically targets the bW decay mode of the T quark and allows for the reconstruction of the T quark candidates. In a second analysis, a multiclassification algorithm, the >boosted event shape tagger,> is deployed to label candidate jets as originating from top quarks, and W, Z, and H. Candidate events are categorized according to the multiplicities of identified jets, and the scalar sum of all observed jet momenta is used to discriminate signal events from the quantum chromodynamics multijet background. Both analyses probe all possible branching fraction combinations of the T and B quarks and set limits at 95% confidence level on their masses, ranging from 740 to 1370 GeV. These results represent a significant improvement relative to existing searches in the fully hadronic final state.
Published: 2019

33. Search for new particles decaying to a jet and an emerging jet

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search is performed for events consistent with the pair production of a new heavy particle that acts as a mediator between a dark sector and normal matter, and that decays to a light quark and a new fermion called a dark quark. The search is based on data corresponding to an integrated luminosity of 16.1 fb−1 from proton-proton collisions at s√=13 TeV collected by the CMS experiment at the LHC in 2016. The dark quark is charged only under a new quantum-chromodynamics-like force, and forms an “emerging jet” via a parton shower, containing long-lived dark hadrons that give rise to displaced vertices when decaying to standard model hadrons. The data are consistent with the expectation from standard model processes. Limits are set at 95% confidence level excluding dark pion decay lengths between 5 and 225 mm for dark mediators with masses between 400 and 1250 GeV. Decay lengths smaller than 5 and greater than 225 mm are also excluded in the lower part of this mass range. The dependence of the limit on the dark pion mass is weak for masses between 1 and 10 GeV. This analysis is the first dedicated search for the pair production of a new particle that decays to a jet and an emerging jet.
Published: 2019

34. Search for nonresonant Higgs boson pair production in the b b ¯ b b ¯ final state at √s = 13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: Results of a search for nonresonant production of Higgs boson pairs, with each Higgs boson decaying to a bb pair, are presented. This search uses data from proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1, collected by the CMS detector at the LHC. No signal is observed, and a 95% confidence level upper limit of 847 fb is set on the cross section for standard model nonresonant Higgs boson pair production times the squared branching fraction of the Higgs boson decay to a bb pair. The same signature is studied, and upper limits are set, in the context of models of physics beyond the standard model that predict modified couplings of the Higgs boson.
Published: 2019

35. Search for new physics in top quark production in dilepton final states in proton-proton collisions at √s=13TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Council for Scientific and Industrial Research (India), Foundation for Polish Science, Compagnia di San Paolo, Consorzio per la Fisica di Trieste, Ministero dell'Istruzione, dell'Università e della Ricerca, Qatar National Research Fund, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Council for Scientific and Industrial Research (India), Foundation for Polish Science, Compagnia di San Paolo, Consorzio per la Fisica di Trieste, Ministero dell'Istruzione, dell'Università e della Ricerca, Qatar National Research Fund, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search for new physics in top quark production is performed in proton-proton collisions at 13TeV. The data set corresponds to an integrated luminosity of 35.9fb-1 collected in 2016 with the CMS detector. Events with two opposite-sign isolated leptons (electrons or muons), and b quark jets in the final state are selected. The search is sensitive to new physics in top quark pair production and in single top quark production in association with a W boson. No significant deviation from the standard model expectation is observed. Results are interpreted in the framework of effective field theory and constraints on the relevant effective couplings are set, one at a time, using a dedicated multivariate analysis. This analysis differs from previous searches for new physics in the top quark sector by explicitly separating t W from t t ¯ events and exploiting the specific sensitivity of the t W process to new physics.
Published: 2019

36. Search for resonant t t ¯ production in proton-proton collisions at √s=13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search for a heavy resonance decaying into a top quark and antiquark (tt¯) pair is performed using proton-proton collisions at s√=13 TeV. The search uses the data set collected with the CMS detector in 2016, which corresponds to an integrated luminosity of 35.9 fb−1. The analysis considers three exclusive final states and uses reconstruction techniques that are optimized for top quarks with high Lorentz boosts, which requires the use of nonisolated leptons and jet substructure techniques. No significant excess of events relative to the expected yield from standard model processes is observed. Upper limits on the production cross section of heavy resonances decaying to a tt¯ pair are calculated. Limits are derived for a leptophobic topcolor Z′ resonance with widths of 1, 10, and 30%, relative to the mass of the resonance, and exclude masses up to 3.80, 5.25, and 6.65 TeV, respectively. Kaluza-Klein excitations of the gluon in the Randall-Sundrum model are excluded up to 4.55 TeV. To date, these are the most stringent limits on tt¯ resonances.
Published: 2019

37. Search for supersymmetry using Higgs boson to diphoton decays at √s = 13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, Vizán, J., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vizán, J.
Abstract: A search for supersymmetry (SUSY) is presented where at least one Higgs boson is produced and decays to two photons in the decay chains of pair-produced SUSY particles. Two analysis strategies are pursued: one focused on strong SUSY production and the other focused on electroweak SUSY production. The presence of charged leptons, additional Higgs boson candidates, and various kinematic variables are used to categorize events into search regions that are sensitive to different SUSY scenarios. The results are based on data from proton-proton collisions at the Large Hadron Collider at a center-of-mass energy of 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 77.5 fb. No statistically significant excess of events is observed relative to the standard model expectations. We exclude bottom squark pair production for bottom squark masses below 530 GeV and a lightest neutralino mass of 1 GeV; wino-like chargino-neutralino production in gauge-mediated SUSY breaking (GMSB) for chargino and neutralino masses below 235 GeV with a gravitino mass of 1 GeV; and higgsino-like chargino-neutralino production in GMSB, where the neutralino decays exclusively to a Higgs boson and a gravitino for neutralino masses below 290 GeV.
Published: 2019

38. Study of the underlying event in top quark pair production in p p collisions at 13 Te

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Council for Scientific and Industrial Research (India), Foundation for Polish Science, Compagnia di San Paolo, Consorzio per la Fisica di Trieste, Ministero dell'Istruzione, dell'Università e della Ricerca, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Qatar National Research Fund, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Council for Scientific and Industrial Research (India), Foundation for Polish Science, Compagnia di San Paolo, Consorzio per la Fisica di Trieste, Ministero dell'Istruzione, dell'Università e della Ricerca, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Qatar National Research Fund, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: Measurements of normalized differential cross sections as functions of the multiplicity and kinematic variables of charged-particle tracks from the underlying event in top quark and antiquark pair production are presented. The measurements are performed in proton-proton collisions at a center-of-mass energy of 13Te, and are based on data collected by the CMS experiment at the LHC in 2016 corresponding to an integrated luminosity of 35.9fb-1. Events containing one electron, one muon, and two jets from the hadronization and fragmentation of b quarks are used. These measurements characterize, for the first time, properties of the underlying event in top quark pair production and show no deviation from the universality hypothesis at energy scales typically above twice the top quark mass.
Published: 2019

39. Search for production of Higgs boson pairs in the four b quark final state using large-area jets in proton-proton collisions at √s=13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search is presented for pair production of the standard model Higgs boson using data from proton-proton collisions at a centre-of-mass energy of 13 TeV, collected by the CMS experiment at the CERN LHC in 2016, and corresponding to an integrated luminosity of 35.9 fb. The final state consists of two b quark-antiquark pairs. The search is conducted in the region of phase space where one pair is highly Lorentz-boosted and is reconstructed as a single large-area jet, and the other pair is resolved and is reconstructed using two b-tagged jets. The results are obtained by combining this analysis with another from CMS looking for events with two large jets. Limits are set on the product of the cross sections and branching fractions for narrow bulk gravitons and radions in warped extradimensional models having a mass in the range 750-3000 GeV. The resulting observed and expected upper limits on the non-resonant Higgs boson pair production cross section correspond to 179 and 114 times the standard model value, respectively, at 95% confidence level. The existence of anomalous Higgs boson couplings is also investigated and limits are set on the non-resonant Higgs boson pair production cross sections for representative coupling values
Published: 2019

40. Search for long-lived particles using nonprompt jets and missing transverse momentum with proton-proton collisions at s=13TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Beijing Municipal Natural Science Foundation, Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, Vizán, J., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Beijing Municipal Natural Science Foundation, Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vizán, J.
Abstract: A search for long-lived particles decaying to displaced, nonprompt jets and missing transverse momentum is presented. The data sample corresponds to an integrated luminosity of 137 fb of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC in 2016–2018. Candidate signal events containing nonprompt jets are identified using the timing capabilities of the CMS electromagnetic calorimeter. The results of the search are consistent with the background prediction and are interpreted using a gauge-mediated supersymmetry breaking reference model with a gluino next-to-lightest supersymmetric particle. In this model, gluino masses up to 2100, 2500, and 1900 GeV are excluded at 95% confidence level for proper decay lengths of 0.3, 1, and 100 m, respectively. These are the best limits to date for such massive gluinos with proper decay lengths greater than ∼0.5 m.
Published: 2019

41. Search for charged Higgs bosons in the H± ? t ± ?t decay channel in proton-proton collisions at √s=13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García-Ferrero, J., García Alonso, A., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García-Ferrero, J., García Alonso, A., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search is presented for charged Higgs bosons in the H ? t? decay mode in the hadronic final state and in final states with an electron or a muon. The search is based on proton-proton collision data recorded by the CMS experiment in 2016 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb. The results agree with the background expectation from the standard model. Upper limits at 95% confidence level are set on the production cross section times branching fraction to t? for an H in the mass range of 80GeV to 3TeV, including the region near the top quark mass. The observed limit ranges from 6 pb at 80 GeV to 5 fb at 3 TeV. The limits are interpreted in the context of the minimal supersymmetric standard model m scenario.[Figure not available: see fulltext.].
Published: 2019

42. Search for supersymmetry in final states with photons and missing transverse momentum in proton-proton collisions at 13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: Results are reported of a search for supersymmetry in final states with photons and missing transverse momentum in proton-proton collisions at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb collected at a center-of-mass energy of 13 TeV using the CMS detector. The results are interpreted in the context of models of gauge-mediated supersymmetry breaking. Production cross section limits are set on gluino and squark pair production in this framework. Gluino masses below 1.86 TeV and squark masses below 1.59 TeV are excluded at 95% confidence level
Published: 2019

43. Search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at √s=8 and 13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Scodellaro, Luca, Rodrigo, Teresa, Ruiz Jimeno, Alberto, Prieels, C., Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Scodellaro, Luca, Rodrigo, Teresa, Ruiz Jimeno, Alberto, Prieels, C., Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: The results of a search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV decaying into two photons are presented. The analysis uses the data set collected with the CMS experiment in proton-proton collisions during the 2012 and 2016 LHC running periods. The data sample corresponds to an integrated luminosity of 19.7 (35.9) fb at s=8 (13)TeV. The expected and observed 95% confidence level upper limits on the product of the cross section and branching fraction into two photons are presented. The observed upper limit for the 2012 (2016)data set ranges from 129 (161)fb to 31 (26)fb. The statistical combination of the results from the analyses of the two data sets in the common mass range between 80 and 110 GeV yields an upper limit on the product of the cross section and branching fraction, normalized to that for a standard model-like Higgs boson, ranging from 0.7 to 0.2, with two notable exceptions: one in the region around the Z boson peak, where the limit rises to 1.1, which may be due to the presence of Drell–Yan dielectron production where electrons could be misidentified as isolated photons, and a second due to an observed excess with respect to the standard model prediction, which is maximal for a mass hypothesis of 95.3 GeV with a local (global)significance of 2.8 (1.3)standard deviations.
Published: 2019

44. Search for dark matter produced in association with a Higgs boson decaying to a pair of bottom quarks in proton–proton collisions at √s=13Te

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search for dark matter produced in association with a Higgs boson decaying to a pair of bottom quarks is performed in proton–proton collisions at a center-of-mass energy of 13Te collected with the CMS detector at the LHC. The analyzed data sample corresponds to an integrated luminosity of 35.9fb-1. The signal is characterized by a large missing transverse momentum recoiling against a bottom quark–antiquark system that has a large Lorentz boost. The number of events observed in the data is consistent with the standard model background prediction. Results are interpreted in terms of limits both on parameters of the type-2 two-Higgs doublet model extended by an additional light pseudoscalar boson a (2HDM+a) and on parameters of a baryonic Z simplified model. The 2HDM+a model is tested experimentally for the first time. For the baryonic Z model, the presented results constitute the most stringent constraints to date.
Published: 2019

45. Search for a W′ boson decaying to a vector-like quark and a top or bottom quark in the all-jets final state

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García-Ferrero, J., García Alonso, A., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García-Ferrero, J., García Alonso, A., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search for a heavy W′ resonance decaying to one B or T vector-like quark and a top or bottom quark, respectively, is presented. The search uses proton-proton collision data collected in 2016 with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb at s=13 TeV. Both decay channels result in a final state with a top quark, a Higgs boson, and a b quark, each produced with significant energy. The all-hadronic decays of both the Higgs boson and the top quark are considered. The final-state jets, some of which correspond to merged decay products of a boosted top quark and a Higgs boson, are selected using jet substructure techniques, which help to suppress standard model backgrounds. A W′ boson signal would appear as a narrow peak in the invariant mass distribution of these jets. No significant deviation in data with respect to the standard model background predictions is observed. Cross section upper limits on W′ boson production in the top quark, Higgs boson, and b quark decay mode are set as a function of the W′ mass, for several vector-like quark mass hypotheses. These are the first limits for W′ boson production in this decay channel, and cover a range of 0.01 to 0.43 pb in the W′ mass range between 1.5 and 4.0 TeV.[Figure not available: see fulltext.].
Published: 2019

46. Search for top quark partners with charge 5/3 in the same-sign dilepton and single-lepton final states in proton-proton collisions at √s=13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search for the pair production of heavy fermionic partners of the top quark with charge 5/3 (X5/3 ) is performed in proton-proton collisions at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC. The data sample analyzed corresponds to an integrated luminosity of 35.9 fb−1 . The X5/3 quark is assumed always to decay into a top quark and a W boson. Both the right-handed and left-handed X5/3 couplings to the W boson are considered. Final states with either a pair of same-sign leptons or a single lepton are studied. No significant excess of events is observed above the expected standard model background. Lower limits at 95% confidence level on the X5/3 quark mass are set at 1.33 and 1.30 TeV respectively for the case of right-handed and left-handed couplings to W bosons in a combination of the same-sign dilepton and single-lepton final states.
Published: 2019

47. Search for the production of four top quarks in the single-lepton and opposite-sign dilepton final states in proton-proton collisions at √s = 13 TeV

Author: European Research Council, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Beijing Municipal Natural Science Foundation, Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, European Commission, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, Vizán, J., European Research Council, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Beijing Municipal Natural Science Foundation, Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministry of Education and Science of the Russian Federation, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, European Commission, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., Gómez, Gervasio, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Russo, L., Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vizán, J.
Abstract: A search for the standard model production of four top quarks (pp → t t ¯ t t ¯) is reported using single-lepton plus jets and opposite-sign dilepton plus jets signatures. Proton-proton collisions are recorded with the CMS detector at the LHC at a center-of-mass energy of 13 TeV in a sample corresponding to an integrated luminosity of 35.8 fb. A multivariate analysis exploiting global event and jet properties is used to discriminate t t ¯ t t ¯ from t t ¯ production. No significant deviation is observed from the predicted background. An upper limit is set on the cross section for t t ¯ t t ¯ production in the standard model of 48 fb at 95% confidence level. When combined with a previous measurement by the CMS experiment from an analysis of other final states, the observed signal significance is 1.4 standard deviations, and the combined cross section measurement is 13−9+11 fb. The result is also interpreted in the framework of effective field theory.
Published: 2019

48. Search for dark matter in events with a leptoquark and missing transverse momentum in proton-proton collisions at 13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Russo, L., Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Russo, L., Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search is presented for dark matter in proton-proton collisions at a center-of-mass energy of s=13 TeV using events with at least one high transverse momentum (p) muon, at least one high-p jet, and large missing transverse momentum. The data were collected with the CMS detector at the CERN LHC in 2016 and 2017, and correspond to an integrated luminosity of 77.4 fb. In the examined scenario, a pair of scalar leptoquarks is assumed to be produced. One leptoquark decays to a muon and a jet while the other decays to dark matter and low-p standard model particles. The signature for signal events would be significant missing transverse momentum from the dark matter in conjunction with a peak at the leptoquark mass in the invariant mass distribution of the highest p muon and jet. The data are observed to be consistent with the background predicted by the standard model. For the first benchmark scenario considered, dark matter masses up to 500 GeV are excluded for leptoquark masses m≈1400 GeV, and up to 300 GeV for m≈1500 GeV. For the second benchmark scenario, dark matter masses up to 600 GeV are excluded for m≈1400 GeV.
Published: 2019

49. Search for invisible decays of a Higgs boson produced through vector boson fusion in proton-proton collisions at s=13TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search for invisible decays of a Higgs boson is performed using proton-proton collision data collected with the CMS detector at the LHC in 2016 at a center-of-mass energy s=13TeV, corresponding to an integrated luminosity of 35.9fb. The search targets the production of a Higgs boson via vector boson fusion. The data are found to be in agreement with the background contributions from standard model processes. An observed (expected) upper limit of 0.33 (0.25), at 95% confidence level, is placed on the branching fraction of the Higgs boson decay to invisible particles, assuming standard model production rates and a Higgs boson mass of 125.09 GeV. Results from a combination of this analysis and other direct searches for invisible decays of the Higgs boson, performed using data collected at s=7, 8, and 13 TeV, are presented. An observed (expected) upper limit of 0.19 (0.15), at 95% confidence level, is set on the branching fraction of invisible decays of the Higgs boson. The combined limit represents the most stringent bound on the invisible branching fraction of the Higgs boson reported to date. This result is also interpreted in the context of Higgs-portal dark matter models, in which upper bounds are placed on the spin-independent dark-matter-nucleon scattering cross section.
Published: 2019

50. Search for low-mass resonances decaying into bottom quark-antiquark pairs in proton-proton collisions at s =13 TeV

Author: European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, Vilar Cortabitarte, R., European Research Council, European Commission, A. G. Leventis Foundation, Alfred P. Sloan Foundation, Alexander von Humboldt Foundation, Belgian Science Policy Office, Fonds de la Recherche Scientifique (Fédération Wallonie-Bruxelles), Agency for Innovation by Science and Technology (Belgium), Ministry of Education, Youth and Sports (Czech Republic), Hungarian Academy of Sciences, Council for Scientific and Industrial Research (India), Foundation for Polish Science, Ministry of Science and Higher Education (Poland), Qatar National Research Fund, Ministerio de Economía y Competitividad (España), Principado de Asturias, European Science Foundation, Ministry of Economy, Development and Tourism (Greece), Chulalongkorn University, Welch Foundation, Weston Havens Foundation, Brochero Cifuentes, J. A., Cabrillo, I. J., Calderon, Alicia, Chazin Quero, B., Duarte Campderros, J., Fernández-García, Marcos, Fernández Manteca, P. J., García Alonso, A., García-Ferrero, J., Gómez, Gervasio, López Virto, A., Marco, Jesús, Martínez-Rivero, Celso, Martínez Ruiz del Arbol, P., Matorras, Francisco, Piedra, Jonatan, Prieels, C., Rodrigo, Teresa, Ruiz Jimeno, Alberto, Scodellaro, Luca, Trevisani, N., Vila, Iván, and Vilar Cortabitarte, R.
Abstract: A search for narrow, low-mass, scalar, and pseudoscalar resonances decaying to bottom quark-antiquark pairs is presented. The search is based on events recorded in s=13 TeV proton-proton collisions with the CMS detector at the LHC, collected in 2016, and corresponding to an integrated luminosity of 35.9 fb-1. The search selects events in which the resonance would be produced with high transverse momentum because of the presence of initial- or final-state radiation. In such events, the decay products of the resonance would be reconstructed as a single large-radius jet with high mass and two-prong substructure. A potential signal would be identified as a narrow excess in the jet invariant mass spectrum. No evidence for such a resonance is observed within the mass range from 50 to 350 GeV, and upper limits at 95% confidence level are set on the product of the cross section and branching fraction to a bottom quark-antiquark pair. These constitute the first constraints from the LHC on exotic bottom quark-antiquark resonances with masses below 325 GeV.
Published: 2019

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