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1. CLASSIFICATION OF CHEST RADIOGRAPHS USING NOVEL ANOMALOUS SALIENCY MAP AND DEEP CONVOLUTIONAL NEURAL NETWORK

Author

Mohd Adli Md Ali, Mohd Radhwan Abidin, Nik Arsyad Nik Muhamad Affendi, Hafidzul Abdullah, Daaniyal R. Rosman, Nu'man Barud'din, Faiz Kemi, and Farid Hayati

Subjects
Saliency mapping, Chest Radiograph, Convolutional Neural Network, Engineering (General). Civil engineering (General), TA1-2040
Abstract

The rapid advancement in pattern recognition via the deep learning method has made it possible to develop an autonomous medical image classification system. This system has proven robust and accurate in classifying most pathological features found in a medical image, such as airspace opacity, mass, and broken bone. Conventionally, this system takes routine medical images with minimum pre-processing as the model's input; in this research, we investigate if saliency maps can be an alternative model input. Recent research has shown that saliency maps' application increases deep learning model performance in image classification, object localization, and segmentation. However, conventional bottom-up saliency map algorithms regularly failed to localize salient or pathological anomalies in medical images. This failure is because most medical images are homogenous, lacking color, and contrast variant. Therefore, we also introduce the Xenafas algorithm in this paper. The algorithm creates a new kind of anomalous saliency map called the Intensity Probability Mapping and Weighted Intensity Probability Mapping. We tested the proposed saliency maps on five deep learning models based on common convolutional neural network architecture. The result of this experiment showed that using the proposed saliency map over regular radiograph chest images increases the sensitivity of most models in identifying images with air space opacities. Using the Grad-CAM algorithm, we showed how the proposed saliency map shifted the model attention to the relevant region in chest radiograph images. While in the qualitative study, it was found that the proposed saliency map regularly highlights anomalous features, including foreign objects and cardiomegaly. However, it is inconsistent in highlighting masses and nodules. ABSTRAK: Perkembangan pesat sistem pengecaman corak menggunakan kaedah pembelajaran mendalam membolehkan penghasilan sistem klasifikasi gambar perubatan secara automatik. Sistem ini berupaya menilai secara tepat jika terdapat tanda-tanda patologi di dalam gambar perubatan seperti kelegapan ruang udara, jisim dan tulang patah. Kebiasaannya, sistem ini akan mengambil gambar perubatan dengan pra-pemprosesan minimum sebagai input. Kajian ini adalah tentang potensi peta salien dapat dijadikan sebagai model input alternatif. Ini kerana kajian terkini telah menunjukkan penggunaan peta salien dapat meningkatkan prestasi model pembelajaran mendalam dalam pengklasifikasian gambar, pengesanan objek, dan segmentasi gambar. Walau bagaimanapun, sistem konvensional algoritma peta salien jenis bawah-ke-atas kebiasaannya gagal mengesan salien atau anomali patologi dalam gambar-gambar perubatan. Kegagalan ini disebabkan oleh sifat gambar perubatan yang homogen, kurang variasi warna dan kontras. Oleh itu, kajian ini memperkenalkan algoritma Xenafas yang menghasilkan dua jenis pemetaan saliensi anomali iaitu Pemetaan Kebarangkalian Keamatan dan Pemetaan Kebarangkalian Keamatan Pemberat. Kajian dibuat pada peta salien yang dicadangkan iaitu pada lima model pembelajaran mendalam berdasarkan seni bina rangkaian neural konvolusi yang sama. Dapatan kajian menunjukkan dengan menggunakan peta salien atas gambar-gambar radiografi dada tetap membantu kesensitifan kebanyakan model dalam mengidentifikasi gambar-gambar dengan kelegapan ruang udara. Dengan menggunakan algoritma Grad-CAM, peta salien yang dicadangkan ini mampu mengalih fokus model kepada kawasan yang relevan kepada gambar radiografi dada. Sementara itu, kajian kualitatif ini juga menunjukkan algoritma yang dicadangkan mampu memberi ciri anomali, termasuk objek asing dan kardiomegali. Walau bagaimanapun, ianya tidak konsisten dalam menjelaskan berat dan nodul.

Published
2021
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2. COVID-19 Deep Learning Prediction Model Using Publicly Available Radiologist-Adjudicated Chest X-Ray Images as Training Data: Preliminary Findings

Author

Mohd Zulfaezal Che Azemin, Radhiana Hassan, Mohd Izzuddin Mohd Tamrin, and Mohd Adli Md Ali

Subjects
Medical physics. Medical radiology. Nuclear medicine, R895-920, Medical technology, R855-855.5
Abstract

The key component in deep learning research is the availability of training data sets. With a limited number of publicly available COVID-19 chest X-ray images, the generalization and robustness of deep learning models to detect COVID-19 cases developed based on these images are questionable. We aimed to use thousands of readily available chest radiograph images with clinical findings associated with COVID-19 as a training data set, mutually exclusive from the images with confirmed COVID-19 cases, which will be used as the testing data set. We used a deep learning model based on the ResNet-101 convolutional neural network architecture, which was pretrained to recognize objects from a million of images and then retrained to detect abnormality in chest X-ray images. The performance of the model in terms of area under the receiver operating curve, sensitivity, specificity, and accuracy was 0.82, 77.3%, 71.8%, and 71.9%, respectively. The strength of this study lies in the use of labels that have a strong clinical association with COVID-19 cases and the use of mutually exclusive publicly available data for training, validation, and testing.

Published
2020
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3. Risk Prediction of Maxillary Canine Impaction among 9-10-Year-Old Malaysian Children: A Radiographic Study

Author

Ahmad Faisal Ismail, Nur Farhana Auni Sharuddin, Nur Hafizah Asha’ari, Mohd Adli Md Ali, Iswan Zuraidi Zainol, Lamis Hejab Alotaibi, and Sreekanth Kumar Mallineni

Subjects
Incisor, Male, Cuspid, General Immunology and Microbiology, Article Subject, Maxilla, Tooth, Impacted, Humans, Female, General Medicine, General Biochemistry, Genetics and Molecular Biology, Retrospective Studies
Abstract

Background. Early diagnosis and interceptive treatment of the maxillary canine impaction is crucial as it reduces treatment complexity and decreases complications and adverse outcomes. Aim and Objectives. To determine the mean maxillary canine position among 9-10-year-old children and predict the risk of impaction of the maxillary canines. Methodology. Panoramic radiographs (PANs) of 289 healthy children aged between 9 and 10 years were observed where the average position of maxillary canines was related to the lateral incisor, sector locations, and angulations to the bicondylar line were traced. The average position was obtained by using descriptive statistics. One sample Wilcoxon signed-rank test is done to predict the risk of canine impaction by comparing the data obtained to the average position from prior studies. Results. A total of 289 PANs (126 males and 163 females) were utilized for the analysis. The findings showed that the average position of the maxillary canines in our population was statistically different from the average position of nonimpacted canines in previous studies. However, on average, more than 85% of canines in our population were still located within the safe range of satisfactory position, with females showing slight predominance outside of the acceptable range. The mean scores of the angles between the right canine and lateral incisor were significantly higher among females than males ( p = 0.001 ). Similarly, females had a significantly higher mean angle of the left canine than males ( p < 0.001 ). In regard to the angles between the bicondylar line and permanent maxillary canine, the mean scores were not significantly different ( p > 0.05 ) on both the left and right side. Conclusion. There is a low risk of impaction of maxillary canines in the Malaysian population. However, more retrospective studies using more radiographic and clinical indicators need to be done to confirm the risk of impaction further.

Published
2022
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5. COVID-19 Deep Learning Prediction Model Using Publicly Available Radiologist-Adjudicated Chest X-Ray Images as Training Data: Preliminary Findings

Author

Radhiana Hassan, Mohd Adli Md Ali, Mohd Zulfaezal Che Azemin, and Mohd Izzuddin Mohd Tamrin

Subjects
Article Subject, Coronavirus disease 2019 (COVID-19), Computer science, education, R895-920, 02 engineering and technology, Convolutional neural network, 030218 nuclear medicine & medical imaging, 03 medical and health sciences, Medical physics. Medical radiology. Nuclear medicine, 0302 clinical medicine, Robustness (computer science), 0202 electrical engineering, electronic engineering, information engineering, medicine, Medical technology, Radiology, Nuclear Medicine and imaging, R855-855.5, medicine.diagnostic_test, Receiver operating characteristic, business.industry, Deep learning, Pattern recognition, 020201 artificial intelligence & image processing, Artificial intelligence, Abnormality, business, Chest radiograph, Test data, Research Article
Abstract

The key component in deep learning research is the availability of training data sets. With a limited number of publicly available COVID-19 chest X-ray images, the generalization and robustness of deep learning models to detect COVID-19 cases developed based on these images are questionable. We aimed to use thousands of readily available chest radiograph images with clinical findings associated with COVID-19 as a training data set, mutually exclusive from the images with confirmed COVID-19 cases, which will be used as the testing data set. We used a deep learning model based on the ResNet-101 convolutional neural network architecture, which was pretrained to recognize objects from a million of images and then retrained to detect abnormality in chest X-ray images. The performance of the model in terms of area under the receiver operating curve, sensitivity, specificity, and accuracy was 0.82, 77.3%, 71.8%, and 71.9%, respectively. The strength of this study lies in the use of labels that have a strong clinical association with COVID-19 cases and the use of mutually exclusive publicly available data for training, validation, and testing.

Published
2020

6. Search for Dark Matter Particles Produced in Association with a Top Quark Pair at s=13 TeV

Author

Carlo Battilana, Mikko Voutilainen, Stefaan Tavernier, Jordan Nash, Daniel Claes, Miguel Vidal Marono, Gabriella Pugliese, Altan Cakir, Mate Csanad, Kenneth Bloom, Pietro Govoni, Gervasio Gomez, Arie Bodek, Sandro Ventura, Vadim Alexakhin, Ted Kolberg, Guenakh Mitselmakher, Lesya Shchutska, Devdatta Majumder, Kun Shi, Caglar Zorbilmez, Lorenzo Viliani, İSA DUMANOGLU, Giuseppe Latino, Krzysztof Doroba, Erhan Gülmez, Yıldıray Kömürcü, Giovanni Abbiendi, Fabrizio Palla, Kevin Pedro, Valentina Sola, Matthias Schröder, Cristina Riccardi, Johan Borg, Natalia Lychkovskaya, Manas Maity, Sami Lehti, Badder Marzocchi, Fred Stober, Jan Krolikowski, Begona De la Cruz, Jan Steggemann, Samet Lezki, Stefano Belforte, Nazar Bartosik, Maria Savina, Raghav Kunnawalkam Elayavalli, Márton Bartók, Daniele Fasanella, Erika Garutti, Ijaz Ahmed, Shalini Thakur, Ramandeep Kumar, Nadia Pastrone, Muhammad Ahmad, Konstantin Androsov, Toni Sculac, Francesco Santanastasio, Stathes Paganis, Arun Kumar, Aysel Kayis Topaksu, Artur Kalinowski, Luisa Fernanda Chaparro Sierra, Giuseppe Della Ricca, Eduard De La Cruz Burelo, Lucia Silvestris, Christian Scharf, Joern Schwandt, Christopher Tully, Luigi Calligaris, Shimaa AbuZeid, Diego Ciangottini, Francisco Javier Cuevas Maestro, Sunil Bansal, Alexander Belyaev, James Buchanan, Roman Kogler, Andrea Giammanco, Marco Toliman Lucchini, Guenther Dissertori, Wei Shi, Daniele Spiga, Claudia-Elisabeth Wulz, Francesca Cavallari, Paolo Maria Montagna, José María Hernández Calama, Efe Yazgan, Nils Faltermann, Yuri Gershtein, Tomas Lindén, Halil Saka, Florencia Canelli, Simone Pigazzini, Armando Bermudez Martinez, Nicolò Trevisani, Giacomo Fedi, Tapio Lampén, Dermot Moran, Gustavo Gil Da Silveira, Leonid Levchuk, Claudio Grandi, Ashim Roy, Alessandro Di Mattia, Marco Zanetti, Diego Figueiredo, Sertac Ozturk, Volodymyr Myronenko, John Conway, Michał Szleper, Viesturs Veckalns, Paolo Giacomelli, Jay R. Dittmann, Yalcin Guler, Marcin Konecki, Franco Ligabue, Ayse Polatoz, Alexander Grohsjean, Silvano Tosi, Martina Malberti, Merve Ince Lezki, Nicolò Tosi, James Wetzel, Jochen Schieck, Leonardo Cristella, Ernesto Migliore, Peicho Petkov, Silvia Goy Lopez, Nikolaos Manthos, Białkowska Helena, Lisa Benato, Salvatore Buontempo, Émilien Chapon, Stéphane PERRIES, JUAN ALCARAZ MAESTRE, Antonio Vilela Pereira, Thong Q. Nguyen, Maria Clemencia Mora Herrera, Ilaria Vai, Gilvan Alves, Cristina Fernández Bedoya, Raffaello D'Alessandro, Nabin Poudyal, Andre Sznajder, André Rosowsky, Sergei Shmatov, Kenyi Hurtado Anampa, Michael Wang, Peter Hobson, Francesco Fallavollita, Rebeca Gonzalez Suarez, Jose Ruiz, Mario Pelliccioni, Alexei Safonov, WILLIAM FORD, Junghwan Goh, German Ruben Martinez, Ewerton Belchior, Rocky Garg, Stephen Mrenna, Panja Luukka, Caterina Vernieri, Rogelio Reyes-Almanza, Fonseca de Souza Sandro, Mohd Adli MD Ali, Karl Ehatäht, Yasser Assran, Frank Geurts, Isabel Josa Mutuberria, David D'Enterria, Sergey Polikarpov, Francesco Fienga, Jay Lawhorn, Arabella Martelli, Robert Cousins, Iban Cabrillo, Ezio Torassa, Eric CONTE, Santeri Laurila, Jorma Tuominiemi, Andrey Popov, Jehad Mousa, Martin Grunewald, Paolo Spagnolo, Robert Klanner, Isidro González Caballero, Crisostomo Sciacca, Seon-Hee Seo, Oscar Gonzalez Lopez, Hengne Li, Francisco Yumiceva, Robert Bainbridge, Elizabeth Starling, Andrea Rizzi, Javier Alberto Murillo Quijada, Florent Lacroix, Todd Adams, Francesco Fiori, Ayse BAT, Ioannis Papadopoulos, Greg Landsberg, Sara Fiorendi, Arsen Khvedelidze, Jennifer Ngadiuba, Tamas Almos Vami, Ivan Heredia de la Cruz, Andrea Venturi, Cameron Bravo, Paolo Vitulo, Pablo Martinez Ruiz del Arbol, Mohsen Khakzad, Ulascan Sarica, Reddy Pratap Gandrajula, Luca Malgeri, Andrew Brinkerhoff, Peter Elmer, Igor Lokhtin, Thomas Bergauer, Andrea Gozzelino, Anton Stepennov, Arnd Meyer, Adel Terkulov, Tatyana Dimova, Seth Zenz, Giuliana Galati, Alberto Ruiz Jimeno, Michele Gallinaro, Daniele Pedrini, J B Singh, Johannes Lange, Peter Wittich, Maria Cruz Fouz Iglesias, Patrizia Barria, Korbinian Schweiger, Gaetano Marco Dallavalle, Pietro Faccioli, Michail Bachtis, Jaana Heikkilä, Arne Christoph Reimers, Catherine Mackay, Michele Arneodo, José Flix Molina, Alexander Tapper, Maciej Gorski, George Alverson, Lev Dudko, Raffaella Radogna, Yasser Mohammed, Juan Pablo Fernández Ramos, Yacine Haddad, Felice Pantaleo, Paolo Meridiani, Ignacio Redondo, Edgar Carrera Jarrin, Alessandro Rossi, Marco Monteno, Gautier Hamel de Monchenault, Salvatore Rappoccio, Roberta Arcidiacono, Bora Akgun, Thomas Reis, Anna Colaleo, Marco CUFFIANI, Mateo Ramírez García, David Vannerom, Diego Alejandro Sanz-Becerra, Varun Sharma, Gabriella Pásztor, Joel Goldstein, Paolo Azzurri, Piotr Zalewski, Cristina TUVE', Carlos Arturo Ávila Bernal, Benedikt Vormwald, Davide Zuolo, Ram Krishna Sharma, Javier Mauricio Duarte, Petr Mandrik, Andreas Hinzmann, Brent Yates, Nikkie Deelen, Matthias Kasemann, Manfred Paulini, Kevin Lannon, Mithat Kaya, David Krofcheck, Michael Tytgat, Claudia Cecchi, Nuno Leonardo, Jesus Marco de Lucas, Maxim Titov, Krzysztof Piotrzkowski, Rainer Wallny, Ayman Ahmad Al-bataineh, Pietro Vischia, Thea Aarrestad, Irene Bachiller, Pieter David, Maria Isabel Pedraza Morales, Tae Jeong Kim, Shabnam Jabeen, Guido Emilio Tonelli, Sherif Elgammal, Davide Di Croce, Luiz Mundim, Jason Lee, Jorgen D'Hondt, Maria Cepeda, Salvatore My, Siew Yan Hoh, Silvio Donato, Deborah Pinna, Mehmet Oglakci, Soureek Mitra, Sergio Novaes, Antonio Delgado Peris, Jeffrey Roskes, DAVID ROMERO ABAD, Hannu Siikonen, André David Tinoco Mendes, Anirban Saha, Pierluigi Bortignon, Edy Ayala, Shubhanshu Chauhan, Simone Gennai, Luca Brianza, Freya Blekman, Sercan Sen, Umberto Dosselli, Raffaele Gerosa, Geoffrey Hall, Eija Tuominen, Vincenzo Monaco, Marco Paganoni, Marta Felcini, Andrei Gritsan, Bugra Bilin, Marko Dragicevic, Cristóvão Da Cruz e Silva, Mikhail Danilov, Martin Erdmann, Antonio Perez-Calero Yzquierdo, Nadezda Chernyavskaya, Viola Sordini, Mykhailo Dalchenko, Michal Bluj, Joona Juhani Havukainen, Francesco Luigi Navarria, Ibrahim Soner Zorbakir, Roberto Covarelli, KEREM CANKOÇAK, Christophorus Grab, Mojtaba Mohammadi Najafabadi, Henning Flaecher, Joao Seixas, Vyacheslav Klyukhin, FERHAT OZOK, Jordi Duarte-Campderrós, Ilse Krätschmer, Alberto Sanchez-Hernandez, Luca Scodellaro, Marino Missiroli, Jan-Frederik Schulte, Fotios Ptochos, Helen Heath, Zuhal Seyma Demiroglu, Henning Kirschenmann, Camilo Carrillo Montoya, Alberto Zucchetta, Ralf Ulrich, Guillelmo Gomez-Ceballos, Kadri Ozdemir, Patrizia Azzi, Vladimir Gavrilov, Konstantinos Theofilatos, Andrea Davide Benaglia, Vito Palladino, Jesus Puerta Pelayo, Prafulla Kumar Behera, Aaron Dominguez, Nicola Pozzobon, Harrison Bertrand Prosper, Livio Fano', Mariana Shopova, Lisa Borgonovi, Mauro Donega, Federico De Guio, Aashaq Shah, Oliver Gutsche, Claudio Caputo, Antonia Di Crescenzo, Nicola Amapane, Mauro Emanuele Dinardo, EMINE GÜRPINAR GÜLER, PAO-TI CHANG, Amedeo Staiano, Marta Verweij, Sudhir Malik, Clemens Lange, Raul Iraq Rabadan Trejo, Bożena Boimska, and Giacomo Sguazzoni

Subjects
Physics, Quark, Top quark, Particle physics, Large Hadron Collider, High Energy Physics::Phenomenology, Dark matter, General Physics and Astronomy, Elementary particle, 7. Clean energy, 01 natural sciences, law.invention, Standard Model, Pseudoscalar, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider
Abstract

A search is performed for dark matter particles produced in association with a top quark pair in proton-proton collisions at root s = 13 TeV. The data correspond to an integrated luminosity of 35.9 fb(-1) recorded by the CMS detector at the LHC. No significant excess over the standard model expectation is observed. The results are interpreted using simplified models of dark matter production via spin-0 mediators that couple to dark matter particles and to standard model quarks, providing constraints on the coupling strength between the mediator and the quarks. These are the most stringent collider limits to date for scalar mediators, and the most stringent for pseudoscalar mediators at low masses.

Published
2019

7. Evidence for the Associated Production of a Single Top Quark and a Photon in Proton-Proton Collisions at s=13 TeV

Author

Carlo Battilana, Viacheslav Bunichev, Mikko Voutilainen, Stefaan Tavernier, Daniel Claes, Miguel Vidal Marono, Gabriella Pugliese, Altan Cakir, Mate Csanad, Kenneth Bloom, Pietro Govoni, Gervasio Gomez, Arie Bodek, Edmilson Manganote, Chang-Seong Moon, Ahmed Ali Abdelalim, Guenakh Mitselmakher, Lesya Shchutska, Colin Bernet, Devdatta Majumder, Kun Shi, Caglar Zorbilmez, Lorenzo Viliani, İSA DUMANOGLU, Giuseppe Latino, Krzysztof Doroba, Erhan Gülmez, Yıldıray Kömürcü, Giovanni Abbiendi, Fabrizio Palla, Kevin Pedro, Valentina Sola, Matthias Schröder, Cristina Riccardi, Johan Borg, Natalia Lychkovskaya, Manas Maity, Sami Lehti, Badder Marzocchi, Fred Stober, Jan Krolikowski, Begona De la Cruz, Jan Steggemann, Samet Lezki, Stefano Belforte, Nazar Bartosik, Raghav Kunnawalkam Elayavalli, Márton Bartók, Daniele Fasanella, Erika Garutti, Suat Ozkorucuklu, Ijaz Ahmed, Shalini Thakur, Ramandeep Kumar, Nadia Pastrone, Muhammad Ahmad, Konstantin Androsov, Toni Sculac, Francesco Santanastasio, Stathes Paganis, Arun Kumar, Aysel Kayis Topaksu, Artur Kalinowski, Luisa Fernanda Chaparro Sierra, Giuseppe Della Ricca, Eduard De La Cruz Burelo, Lucia Silvestris, Christian Scharf, Joern Schwandt, Christopher Tully, Luigi Calligaris, Shimaa AbuZeid, Diego Ciangottini, Francisco Javier Cuevas Maestro, Sunil Bansal, Alexander Belyaev, James Buchanan, Roman Kogler, Andrea Giammanco, Marco Toliman Lucchini, Guenther Dissertori, Wei Shi, Daniele Spiga, Claudia-Elisabeth Wulz, Francesca Cavallari, Paolo Maria Montagna, José María Hernández Calama, Efe Yazgan, Nils Faltermann, Yuri Gershtein, Tomas Lindén, Halil Saka, Florencia Canelli, Simone Pigazzini, Armando Bermudez Martinez, Nicolò Trevisani, Giacomo Fedi, Elisabetta Gallo, Tapio Lampén, Dermot Moran, Gustavo Gil Da Silveira, Leonid Levchuk, Claudio Grandi, Ashim Roy, Alessandro Di Mattia, Marco Zanetti, Diego Figueiredo, Sertac Ozturk, Volodymyr Myronenko, John Conway, Michał Szleper, Viesturs Veckalns, Paolo Giacomelli, Jay R. Dittmann, Yalcin Guler, Marcin Konecki, Franco Ligabue, Alexander Grohsjean, Silvano Tosi, Martina Malberti, Merve Ince Lezki, Nicolò Tosi, James Wetzel, Jochen Schieck, Leonardo Cristella, Ernesto Migliore, Peicho Petkov, Silvia Goy Lopez, Nikolaos Manthos, Białkowska Helena, Lisa Benato, Salvatore Buontempo, Émilien Chapon, Stéphane PERRIES, JUAN ALCARAZ MAESTRE, Antonio Vilela Pereira, Thong Q. Nguyen, Maria Clemencia Mora Herrera, Ilaria Vai, Gilvan Alves, Cristina Fernández Bedoya, Raffaello D'Alessandro, Nabin Poudyal, Andre Sznajder, André Rosowsky, Sergei Shmatov, Kenyi Hurtado Anampa, Michael Wang, Peter Hobson, Francesco Fallavollita, Rebeca Gonzalez Suarez, Jose Ruiz, Mario Pelliccioni, Alexei Safonov, WILLIAM FORD, Junghwan Goh, German Ruben Martinez, Ewerton Belchior, Rocky Garg, Stephen Mrenna, Panja Luukka, Caterina Vernieri, Rogelio Reyes-Almanza, Fonseca de Souza Sandro, Mohd Adli MD Ali, Karl Ehatäht, Frank Geurts, Isabel Josa Mutuberria, David D'Enterria, Sergey Polikarpov, Sandeep Sharma, Francesco Fienga, Jay Lawhorn, Arabella Martelli, Robert Cousins, Iban Cabrillo, Ezio Torassa, Eric CONTE, Santeri Laurila, Jorma Tuominiemi, Andrey Popov, Stefano Ragazzi, Jehad Mousa, Martin Grunewald, Paolo Spagnolo, Robert Klanner, Isidro González Caballero, Crisostomo Sciacca, Seon-Hee Seo, Oscar Gonzalez Lopez, Hengne Li, Francisco Yumiceva, Robert Bainbridge, Elizabeth Starling, Andrea Rizzi, Javier Alberto Murillo Quijada, Florent Lacroix, Todd Adams, Francesco Fiori, Ioannis Papadopoulos, Greg Landsberg, Sara Fiorendi, Arsen Khvedelidze, Jennifer Ngadiuba, Tamas Almos Vami, Ivan Heredia de la Cruz, Andrea Venturi, Cameron Bravo, Paolo Vitulo, Pablo Martinez Ruiz del Arbol, Mohsen Khakzad, Ulascan Sarica, Reddy Pratap Gandrajula, Luca Malgeri, Andrew Brinkerhoff, Peter Elmer, Igor Lokhtin, Andrea Gozzelino, Anton Stepennov, Arnd Meyer, Adel Terkulov, Tatyana Dimova, Seth Zenz, Giuliana Galati, Alberto Ruiz Jimeno, Michele Gallinaro, Daniele Pedrini, Johannes Lange, Peter Wittich, Maria Cruz Fouz Iglesias, Patrizia Barria, Korbinian Schweiger, Gaetano Marco Dallavalle, Pietro Faccioli, Michail Bachtis, Jaana Heikkilä, Arne Christoph Reimers, Catherine Mackay, Hallie Trauger, Michele Arneodo, José Flix Molina, Alexander Tapper, Maciej Gorski, George Alverson, Lev Dudko, Raffaella Radogna, Juan Pablo Fernández Ramos, Yacine Haddad, Felice Pantaleo, Paolo Meridiani, Ignacio Redondo, Edgar Carrera Jarrin, Marco Monteno, Gautier Hamel de Monchenault, Salvatore Rappoccio, Roberta Arcidiacono, Bora Akgun, Thomas Reis, Anna Colaleo, Marco CUFFIANI, Mateo Ramírez García, David Vannerom, Diego Alejandro Sanz-Becerra, Varun Sharma, Gabriella Pásztor, Joel Goldstein, Paolo Azzurri, Piotr Zalewski, Elsayed Salama, Sergio Lo Meo, Cristina TUVE', Carlos Arturo Ávila Bernal, Benedikt Vormwald, Davide Zuolo, Ram Krishna Sharma, Javier Mauricio Duarte, Petr Mandrik, Andreas Hinzmann, Brent Yates, Nikkie Deelen, Matthias Kasemann, Manfred Paulini, Kevin Lannon, Mithat Kaya, David Krofcheck, Michael Tytgat, Claudia Cecchi, Nuno Leonardo, Jesus Marco de Lucas, Maxim Titov, Krzysztof Piotrzkowski, Rainer Wallny, Ayman Ahmad Al-bataineh, Pietro Vischia, Thea Aarrestad, Irene Bachiller, Pieter David, Maria Isabel Pedraza Morales, Tae Jeong Kim, Shabnam Jabeen, Guido Emilio Tonelli, Davide Di Croce, J.F. Benitez, Luiz Mundim, Jason Lee, Jorgen D'Hondt, Maria Cepeda, Salvatore My, Siew Yan Hoh, Silvio Donato, Deborah Pinna, Mehmet Oglakci, Soureek Mitra, Sergio Novaes, Antonio Delgado Peris, Jeffrey Roskes, Hannu Siikonen, André David Tinoco Mendes, Anirban Saha, Edy Ayala, Shubhanshu Chauhan, Simone Gennai, Luca Brianza, Freya Blekman, Sercan Sen, Umberto Dosselli, Raffaele Gerosa, Geoffrey Hall, Eija Tuominen, Vincenzo Monaco, Marco Paganoni, Marta Felcini, Andrei Gritsan, Bugra Bilin, Marko Dragicevic, Cristóvão Da Cruz e Silva, Mikhail Danilov, Martin Erdmann, Antonio Perez-Calero Yzquierdo, Nadezda Chernyavskaya, Viola Sordini, Mykhailo Dalchenko, Michal Bluj, Joona Juhani Havukainen, Francesco Luigi Navarria, Ibrahim Soner Zorbakir, Roberto Covarelli, KEREM CANKOÇAK, Christophorus Grab, Mojtaba Mohammadi Najafabadi, Henning Flaecher, Rui Xiao, Vyacheslav Klyukhin, FERHAT OZOK, Natalia Korneeva, Jordi Duarte-Campderrós, Ilse Krätschmer, Alberto Sanchez-Hernandez, Luca Scodellaro, Marino Missiroli, Fotios Ptochos, Helen Heath, Zuhal Seyma Demiroglu, Henning Kirschenmann, Camilo Carrillo Montoya, Alberto Zucchetta, Ralf Ulrich, Guillelmo Gomez-Ceballos, Kadri Ozdemir, Patrizia Azzi, Vladimir Gavrilov, Konstantinos Theofilatos, Andrea Davide Benaglia, Vito Palladino, Jesus Puerta Pelayo, Prafulla Kumar Behera, Sudarshan Paramesvaran, Aaron Dominguez, Harrison Bertrand Prosper, Livio Fano', Mariana Shopova, Lisa Borgonovi, Mauro Donega, Federico De Guio, Aashaq Shah, Oliver Gutsche, Ali Celik, Claudio Caputo, Nicola Amapane, Mauro Emanuele Dinardo, EMINE GÜRPINAR GÜLER, PAO-TI CHANG, Amedeo Staiano, Marta Verweij, Sudhir Malik, Clemens Lange, Alexander Barnyakov, Raul Iraq Rabadan Trejo, Bożena Boimska, and Giacomo Sguazzoni

Subjects
Quark, Physics, Top quark, Particle physics, Muon, Proton, 010308 nuclear & particles physics, Branching fraction, General Physics and Astronomy, 01 natural sciences, Bottom quark, Hadronization, 0103 physical sciences, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, 010306 general physics
Abstract

The first evidence of events consistent with the production of a single top quark in association with a photon is reported. The analysis is based on proton-proton collisions at root s = 13 TeV and recorded by the CMS experiment in 2016, corresponding to an integrated luminosity of 35.9 fb(-1). Events are selected by requiring the presence of a muon (mu), a photon (gamma), an imbalance in transverse momentum from an undetected neutrino (nu), and at least two jets (j) of which exactly one is identified as associated with the hadronization of a b quark. A multivariate discriminant based on topological and kinematic event properties is employed to separate signal from background processes. An excess above the backgroundonly hypothesis is observed, with a significance of 4.4 standard deviations. A fiducial cross section is measured for isolated photons with transverse momentum greater than 25 GeV in the central region of the detector. The measured product of the cross section and branching fraction is sigma(pp -> t gamma j) B (t -> mu nu b) = 115 +/- 17 (stat) +/- 30(syst) fb, which is consistent with the standard model prediction.

Published
2018

8. Measurement of the differential cross sections for the associated production of a W boson and jets in proton-proton collisions at s=13 TeV

Author

Carlo Battilana, Mikko Voutilainen, Stefaan Tavernier, Daniel Claes, Renjie Wang, Milos Dordevic, Miguel Vidal Marono, Gabriella Pugliese, Altan Cakir, Alberto Escalante del Valle, Mate Csanad, Kenneth Bloom, Pietro Govoni, Gervasio Gomez, Maximilian Pérez Prada, Arie Bodek, Sandro Ventura, Riccardo Di Maria, Mikhail Dubinin, Ivan Marchesini, Edmilson Manganote, Chang-Seong Moon, Joanne Cole, Ted Kolberg, Guenakh Mitselmakher, Lesya Shchutska, Luca Pacher, Colin Bernet, Devdatta Majumder, Arka Santra, Caglar Zorbilmez, Lorenzo Viliani, Wesley Smith, Krzysztof Doroba, Erhan Gülmez, Valentina Sola, Matthias Schröder, Cristina Riccardi, Natalia Lychkovskaya, Manas Maity, Alicia Calderon, Sami Lehti, Badder Marzocchi, Borislav Pavlov, Fred Stober, Luke Kreczko, Julio Celso Borello Vargas, Jan Krolikowski, Damir Devetak, Begona De la Cruz, Jan Steggemann, Georgios Konstantinos Krintiras, Samet Lezki, Stefano Belforte, Nazar Bartosik, Raghav Kunnawalkam Elayavalli, Márton Bartók, Shahram Rahatlou, Richard Barbieri, Daniele Fasanella, Ijaz Ahmed, Ramandeep Kumar, Nadia Pastrone, Heiner Tholen, Muhammad Ahmad, Konstantin Androsov, Toni Sculac, Stathes Paganis, Arun Kumar, Aysel Kayis Topaksu, Alessia Rita Tricomi, Artur Kalinowski, Andreas Pfeiffer, Luisa Fernanda Chaparro Sierra, Giuseppe Della Ricca, Lucia Silvestris, Christian Scharf, Joern Schwandt, Christopher Tully, Luigi Calligaris, Shimaa AbuZeid, Diego Ciangottini, Francisco Javier Cuevas Maestro, Sunil Bansal, Alexander Belyaev, James Buchanan, Roman Kogler, Andrea Giammanco, Marco Toliman Lucchini, Guenther Dissertori, Daniele Spiga, Norbert Neumeister, Paolo Maria Montagna, José María Hernández Calama, Efe Yazgan, Hannsjörg Weber, Sinan Sagir, Tomas Lindén, Luca Cadamuro, John Stupak III, Florencia Canelli, Tom Ferbel, Cesar Augusto Bernardes, Qiang Li, Saeid Paktinat mehdiabadi, Jovan Milosevic, Nicolò Trevisani, Elisabetta Gallo, Tapio Lampén, Dermot Moran, Md Naimuddin, Gustavo Gil Da Silveira, Leonid Levchuk, Giovanni Petrucciani, Dayong Wang, Ashim Roy, Alfredo Castaneda Hernandez, Alessandro Di Mattia, Marco Zanetti, Yue Shi Lai, Cristina Botta, Martti Raidal, Stefan Piperov, Michał Szleper, Rostyslav Shevchenko, Viesturs Veckalns, Paolo Giacomelli, Jay R. Dittmann, Yalcin Guler, Marcin Konecki, Franco Ligabue, Alexander Grohsjean, Vitaliano Ciulli, Ayman Mahrous, Martina Malberti, Nicolò Tosi, James Wetzel, Jochen Schieck, Silvia Goy Lopez, Nikolaos Manthos, Białkowska Helena, Salvatore Buontempo, Suman Chatterjee, Stéphane PERRIES, JUAN ALCARAZ MAESTRE, Antonio Vilela Pereira, Thong Q. Nguyen, Zhenbin Wu, Maria Clemencia Mora Herrera, Ilaria Vai, Rohan Bhandari, Sandeep Bhowmik, Raffaello D'Alessandro, Andre Sznajder, Sergei Shmatov, Pedro Galli Mercadante, Michael Wang, Evgeny Zhemchugov, Daniel Tapia Takaki, Peter Hobson, Francesco Fallavollita, Rebeca Gonzalez Suarez, Andrea Massironi, Jose Ruiz, Mario Pelliccioni, Caroline Collard, Alexei Safonov, WILLIAM FORD, Jeson Jacob, Wuming Luo, German Ruben Martinez, David Fehling, Rocky Garg, Stephen Mrenna, Panja Luukka, Saranya Samik Ghosh, Caterina Vernieri, Fonseca de Souza Sandro, Mohd Adli MD Ali, Maurizio Pierini, Aurelijus Rinkevicius, Yasser Assran, Frank Geurts, Isabel Josa Mutuberria, Junquan Tao, Paul Kyberd, Ece ASILAR, David D'Enterria, Sergey Polikarpov, Adish Vartak, Francesco Fienga, Patrick Dunne, Jay Lawhorn, Arabella Martelli, Iban Cabrillo, Ezio Torassa, Eric CONTE, Jorma Tuominiemi, James Keaveney, Andrey Popov, Jehad Mousa, Hua Wei, Martin Grunewald, Paolo Spagnolo, Nicholas Wardle, Robert Klanner, Frank Golf, Isidro González Caballero, Crisostomo Sciacca, Seon-Hee Seo, Oscar Gonzalez Lopez, Anna Cimmino, Hengne Li, Tahys Janssen, Pete Markowitz, Francisco Yumiceva, Robert Bainbridge, Andrea Rizzi, Klaus Rabbertz, Florent Lacroix, Todd Adams, Francesco Fiori, Luigi (Gigi) Rolandi, Andrew Ivanov, Massimo Casarsa, Ioannis Papadopoulos, Greg Landsberg, Sara Fiorendi, Arsen Khvedelidze, Jennifer Ngadiuba, Francesca Ricci-Tam, Ivan Heredia de la Cruz, Andrea Venturi, Bingxuan Liu, Cameron Bravo, Vuko Brigljević, Vittorio Raoul Tavolaro, Terence Libeiro, Pablo Martinez Ruiz del Arbol, Mohsen Khakzad, Ulascan Sarica, Reddy Pratap Gandrajula, Luca Malgeri, Andrew Brinkerhoff, Lea Caminada, Leandar Litov, Zhicai Zhang, Anton Stepennov, Arnd Meyer, Seth Zenz, Alberto Ruiz Jimeno, Michele Gallinaro, Daniele Pedrini, Maria Cruz Fouz Iglesias, Patrizia Barria, Pietro Faccioli, Michail Bachtis, Muhammad Gul, Michele Arneodo, José Flix Molina, Javier Fernandez Menendez, François Lagarde, Alexander Tapper, Maciej Gorski, George Alverson, Lev Dudko, Raffaella Radogna, Karl Ecklund, Ali Harb, Salvatore Costa, Yacine Haddad, Paolo Meridiani, Ignacio Redondo, Edgar Carrera Jarrin, Alessandro Rossi, Marco Monteno, Gautier Hamel de Monchenault, Salvatore Rappoccio, Roberta Arcidiacono, Gerrit Van Onsem, Bora Akgun, Thomas Reis, Kunal Kothekar, Anna Colaleo, Lutz Feld, David Vannerom, Varun Sharma, Gabriella Pásztor, Sylvie Braibant-Giacomelli, Joel Goldstein, Yagya Joshi, Piotr Zalewski, Cristina TUVE', Benedikt Vormwald, Ram Krishna Sharma, Javier Mauricio Duarte, Andreas Hinzmann, Matthias Kasemann, Manfred Paulini, Kevin Lannon, Mithat Kaya, David Krofcheck, Michael Tytgat, Claudia Cecchi, Christian Autermann, Myriam Schönenberger, Florian Beaudette, Sandra Malvezzi, Nuno Leonardo, Jesus Marco de Lucas, Maxim Titov, Luca Lista, Jose Enrique Palencia Cortezon, Krzysztof Piotrzkowski, Rainer Wallny, Ayman Ahmad Al-bataineh, Pietro Vischia, Schoefbeck Robert, Maria Isabel Pedraza Morales, Tae Jeong Kim, Marco Pieri, Shabnam Jabeen, Guido Emilio Tonelli, Davide Di Croce, Ugur Kiminsu, Luiz Mundim, Jorgen D'Hondt, Maria Cepeda, Yuri Andreev, Salvatore My, Norraphat Srimanobhas, Silvio Donato, Deborah Pinna, Mehmet Oglakci, Morgan Lethuillier, Soureek Mitra, Sergio Novaes, Antonio Delgado Peris, Amina Zghiche, Pieter Everaerts, Jeffrey Roskes, DAVID ROMERO ABAD, Mohammed Attia Mahmoud, André David Tinoco Mendes, Olga Evdokimov, Pierluigi Bortignon, Shubhanshu Chauhan, Simone Gennai, Luca Brianza, Freya Blekman, Geoffrey Hall, Eija Tuominen, Marco Paganoni, Marta Felcini, Robert Ciesielski, Andrei Gritsan, Marko Dragicevic, Giovanni Zevi Della Porta, Cristóvão Da Cruz e Silva, Martin Erdmann, Antonio Perez-Calero Yzquierdo, Viola Sordini, Michal Bluj, Ibrahim Soner Zorbakir, Roberto Covarelli, Stephanie BARRILLON, KEREM CANKOÇAK, Daniel Bloch, Mojtaba Mohammadi Najafabadi, Joao Seixas, Dilson De Jesus Damiao, Arthur Moraes, Lucas Taylor, Vyacheslav Klyukhin, Francisco Matorras, Mara Soares, FERHAT OZOK, Luca Scodellaro, Marino Missiroli, Jan-Frederik Schulte, Fotios Ptochos, Helen Heath, Zuhal Seyma Demiroglu, Debarati Roy, Alberto Zucchetta, Ralf Ulrich, Guillelmo Gomez-Ceballos, Kadri Ozdemir, Patrizia Azzi, Nikola Godinovic, Vladimir Gavrilov, Johannes Haller, Konstantinos Theofilatos, Eliza Melo da Costa, Andrea Davide Benaglia, Vito Palladino, Jesus Puerta Pelayo, Monica Vazquez Acosta, Ajay Kumar, Ram Krishna Dewanjee, Christophe Delaere, Prafulla Kumar Behera, Sudarshan Paramesvaran, Simon Regnard, Aaron Dominguez, Nicola Pozzobon, Emanuele Usai, Matthew Herndon, Alberto Belloni, Piet Verwilligen, Suneel Dutt, Harrison Bertrand Prosper, Livio Fano', Mariana Shopova, Fabio Ravera, Mauro Donega, Abideh Jafari, Federico De Guio, Luigi Benussi, Jorge Rodriguez, Aashaq Shah, Oliver Gutsche, Ali Celik, Nicola Amapane, Mauro Emanuele Dinardo, EMINE GÜRPINAR GÜLER, PAO-TI CHANG, Elisabetta Manca, Thiago Rafael Fernandez Perez Tomei, Marta Verweij, Stefano Colafranceschi, Sudhir Malik, Clemens Lange, Bożena Boimska, and Giacomo Sguazzoni

Subjects
Physics, Nuclear physics, Proton, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, Differential (mathematics)
Published
2017

9. Measurement of the t t ¯ $$ \mathrm{t}\overline{\mathrm{t}} $$ production cross section in the eμ channel in proton-proton collisions at s = 7 $$ \sqrt{s}=7 $$ and 8 TeV

Author

Carlo Battilana, Viacheslav Bunichev, Mikko Voutilainen, Stefaan Tavernier, Daniel Claes, Renjie Wang, Milos Dordevic, Miguel Vidal Marono, Gabriella Pugliese, Altan Cakir, Alberto Escalante del Valle, Kenneth Bloom, Pietro Govoni, Gervasio Gomez, Maximilian Pérez Prada, Arie Bodek, Mikhail Dubinin, Ivan Marchesini, Edmilson Manganote, Chang-Seong Moon, Joanne Cole, GIULIA D'IMPERIO, Ted Kolberg, Ahmed Ali Abdelalim, Guenakh Mitselmakher, Lesya Shchutska, Luca Pacher, Colin Bernet, Devdatta Majumder, Caglar Zorbilmez, Lorenzo Viliani, Wesley Smith, Krzysztof Doroba, Erhan Gülmez, Fabrizio Palla, Valentina Sola, Matthias Schröder, Cristina Riccardi, Natalia Lychkovskaya, Manas Maity, Sami Lehti, Valentin Geisler-Knünz, Badder Marzocchi, Borislav Pavlov, Fred Stober, Luke Kreczko, Julio Celso Borello Vargas, Jan Krolikowski, Damir Devetak, Begona De la Cruz, Jan Steggemann, Stefano Belforte, Nazar Bartosik, Raghav Kunnawalkam Elayavalli, Márton Bartók, Antonio Branca, Shahram Rahatlou, Richard Barbieri, Daniele Fasanella, Ijaz Ahmed, Ramandeep Kumar, Nadia Pastrone, Heiner Tholen, Muhammad Ahmad, Konstantin Androsov, Arun Kumar, Aysel Kayis Topaksu, Artur Kalinowski, Andreas Pfeiffer, Giuseppe Della Ricca, Lucia Silvestris, Christian Scharf, Joern Schwandt, Christopher Tully, Luigi Calligaris, Shimaa AbuZeid, Diego Ciangottini, Francisco Javier Cuevas Maestro, Sunil Bansal, Alexander Belyaev, Roman Kogler, Andrea Giammanco, Marco Toliman Lucchini, Guenther Dissertori, Norbert Neumeister, Sara Alderweireldt, Francesca Cavallari, Paolo Maria Montagna, José María Hernández Calama, Efe Yazgan, Hannsjörg Weber, Sinan Sagir, Tomas Lindén, Halil Saka, Luca Cadamuro, John Stupak III, Florencia Canelli, Manfred Krammer, Cesar Augusto Bernardes, Qiang Li, Ali Fahim, Saeid Paktinat mehdiabadi, Jovan Milosevic, Nicolò Trevisani, Nishu Nishu, Elisabetta Gallo, Tapio Lampén, Dermot Moran, Md Naimuddin, Leonid Levchuk, Claudio Grandi, Enrique Calvo Alamillo, Giovanni Petrucciani, Dayong Wang, Ashim Roy, Alfredo Castaneda Hernandez, Alessandro Di Mattia, Marco Zanetti, Yue Shi Lai, Diego Figueiredo, Sertac Ozturk, Cristina Botta, Martti Raidal, Stefan Piperov, Fedor Ratnikov, Michał Szleper, Viesturs Veckalns, Paolo Giacomelli, Jay R. Dittmann, Yalcin Guler, Alberto Hernandez Almada, Marcin Konecki, Franco Ligabue, Vitaliano Ciulli, Martina Malberti, Nicolò Tosi, James Wetzel, Jochen Schieck, Silvia Goy Lopez, Nikolaos Manthos, Xin Shi, Salvatore Buontempo, Émilien Chapon, Stéphane PERRIES, JUAN ALCARAZ MAESTRE, Antonio Vilela Pereira, Zhenbin Wu, Maria Clemencia Mora Herrera, Ilaria Vai, Alessandro Gaz, Sandeep Bhowmik, Raffaello D'Alessandro, Andre Sznajder, Sergei Shmatov, Pedro Galli Mercadante, Michael Wang, Jia Fu Low, Peter Hobson, Rebeca Gonzalez Suarez, Andrea Massironi, Jose Ruiz, Mario Pelliccioni, Caroline Collard, Alexei Safonov, WILLIAM FORD, Jeson Jacob, Wuming Luo, Junghwan Goh, German Ruben Martinez, David Fehling, Rocky Garg, Stephen Mrenna, Panja Luukka, Pablo García Abia, Saranya Samik Ghosh, Caterina Vernieri, Fonseca de Souza Sandro, Mohd Adli MD Ali, Maurizio Pierini, Aurelijus Rinkevicius, Yasser Assran, Frank Geurts, Isabel Josa Mutuberria, Junquan Tao, Paul Kyberd, Ece ASILAR, David D'Enterria, Adish Vartak, Patrick Dunne, Arabella Martelli, Iban Cabrillo, Ezio Torassa, Eric CONTE, Jorma Tuominiemi, James Keaveney, Andrey Popov, Jehad Mousa, Hua Wei, Martin Grunewald, Paolo Spagnolo, Nicholas Wardle, Robert Klanner, Frank Golf, Isidro González Caballero, Mario Merola, Crisostomo Sciacca, Oscar Gonzalez Lopez, Anna Cimmino, Hengne Li, Tahys Janssen, Pete Markowitz, Qiao Xu, Victor Kim, Robert Bainbridge, Andrea Rizzi, Klaus Rabbertz, Florent Lacroix, Todd Adams, Francesco Fiori, Luigi (Gigi) Rolandi, Andrew Ivanov, Massimo Casarsa, Ioannis Papadopoulos, Greg Landsberg, Sara Fiorendi, Arsen Khvedelidze, Jennifer Ngadiuba, Francesca Ricci-Tam, Ivan Heredia de la Cruz, Andrea Venturi, Bingxuan Liu, Marina Chadeeva, Vuko Brigljević, Vittorio Raoul Tavolaro, Terence Libeiro, Pablo Martinez Ruiz del Arbol, Mohsen Khakzad, Ulascan Sarica, Reddy Pratap Gandrajula, Luca Malgeri, Federico Nguyen, Nicolo Cartiglia, Andrew Brinkerhoff, Lea Caminada, Natalie Heracleous, Leandar Litov, Andrea Gozzelino, Arnd Meyer, Seth Zenz, Sergey Senkin, Alberto Ruiz Jimeno, Michele Gallinaro, Daniele Pedrini, J B Singh, Maria Cruz Fouz Iglesias, Patrizia Barria, Pietro Faccioli, Michail Bachtis, Muhammad Gul, Michele Arneodo, José Flix Molina, Javier Fernandez Menendez, François Lagarde, Alexander Tapper, Maciej Gorski, George Alverson, Lev Dudko, Raffaella Radogna, Karl Ecklund, Ali Harb, Salvatore Costa, Michael Mooney, Yacine Haddad, Paolo Meridiani, Ignacio Redondo, Edgar Carrera Jarrin, Gautier Hamel de Monchenault, Salvatore Rappoccio, Roberta Arcidiacono, Gerrit Van Onsem, Bora Akgun, Thomas Reis, Kunal Kothekar, Anna Colaleo, Lutz Feld, Varun Sharma, Sylvie Braibant-Giacomelli, Joel Goldstein, Paolo Azzurri, Piotr Zalewski, Elsayed Salama, Cristina TUVE', Benedikt Vormwald, Ram Krishna Sharma, Javier Mauricio Duarte, Andreas Hinzmann, KAI-FENG CHEN, Matthias Kasemann, Manfred Paulini, Kevin Lannon, Mithat Kaya, Michael Tytgat, Christian Autermann, Myriam Schönenberger, Florian Beaudette, Sandra Malvezzi, Nuno Leonardo, Jesus Marco de Lucas, Maxim Titov, Laurent Forthomme, Luca Lista, Jose Enrique Palencia Cortezon, Krzysztof Piotrzkowski, Rainer Wallny, Pietro Vischia, Schoefbeck Robert, Maria Isabel Pedraza Morales, Tae Jeong Kim, Marco Pieri, Sunil Manohar Dogra, Shabnam Jabeen, Guido Emilio Tonelli, Luiz Mundim, Jorgen D'Hondt, Maria Cepeda, Yuri Andreev, Salvatore My, Norraphat Srimanobhas, Dimitri Bourilkov, Silvio Donato, Deborah Pinna, Morgan Lethuillier, Soureek Mitra, Santiago Folgueras, Sergio Novaes, Antonio Delgado Peris, Amina Zghiche, Pieter Everaerts, Jeffrey Roskes, DAVID ROMERO ABAD, André David Tinoco Mendes, Olga Evdokimov, Pierluigi Bortignon, Shubhanshu Chauhan, Simone Gennai, Luca Brianza, Freya Blekman, Valentina Gori, Raffaele Gerosa, Geoffrey Hall, Marco Paganoni, Marta Felcini, Giacomo ORTONA, Patrice Verdier, Andrei Gritsan, Mercedes Miñano Moya, Marko Dragicevic, Giovanni Zevi Della Porta, Steven Worm, Cristóvão Da Cruz e Silva, Martin Erdmann, Antonio Perez-Calero Yzquierdo, Viola Sordini, Michal Bluj, Roberto Covarelli, Stephanie BARRILLON, Daniel Bloch, Mojtaba Mohammadi Najafabadi, Joao Seixas, Dilson De Jesus Damiao, Hasan Ogul, Arthur Moraes, Lucas Taylor, Vyacheslav Klyukhin, Francisco Matorras, Mara Soares, FERHAT OZOK, Natalia Korneeva, Ilse Krätschmer, Luca Scodellaro, Marino Missiroli, Jan-Frederik Schulte, Fotios Ptochos, Helen Heath, Wolfgang Waltenberger, Zuhal Seyma Demiroglu, Camilo Carrillo Montoya, Debarati Roy, Alberto Zucchetta, João Rodrigues Antunes, Ralf Ulrich, Guillelmo Gomez-Ceballos, Kadri Ozdemir, Patrizia Azzi, Benjamin Kilminster, Lauri Wendland, Nikola Godinovic, Vladimir Gavrilov, Johannes Haller, Konstantinos Theofilatos, Eliza Melo da Costa, Andrea Davide Benaglia, Jesus Puerta Pelayo, Monica Vazquez Acosta, Ajay Kumar, Ram Krishna Dewanjee, Christophe Delaere, Sudarshan Paramesvaran, Simon Regnard, YEE HSIUNG, Aaron Dominguez, Nicola Pozzobon, Emanuele Usai, Matthew Herndon, Sasa Micanovic, Alberto Belloni, Piet Verwilligen, Livio Fano', Mariana Shopova, Fabio Ravera, Mauro Donega, Abideh Jafari, Federico De Guio, Luigi Benussi, Jorge Rodriguez, Oliver Gutsche, Ali Celik, Nicola Amapane, Mauro Emanuele Dinardo, EMINE GÜRPINAR GÜLER, PAO-TI CHANG, Emilio Meschi, Thiago Rafael Fernandez Perez Tomei, Stefano Colafranceschi, Sudhir Malik, Pedro Manuel Vieira de Castro Ferreira da Silva, Clemens Lange, Bożena Boimska, and Giacomo Sguazzoni

Subjects
Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Top quark, Large Hadron Collider, Proton, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, 7. Clean energy, 01 natural sciences, Bottom quark, Nuclear physics, Pair production, 0103 physical sciences, Neutralino, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Compact Muon Solenoid
Abstract

The inclusive cross section for top quark pair production is measured in proton-proton collisions at sqrt(s) = 7 and 8 TeV, corresponding to 5.0 and 19.7 invers-femtobarns, respectively, with the CMS experiment at the LHC. The cross sections are measured in the electron-muon channel using a binned likelihood fit to multi-differential final state distributions related to identified b quark jets and other jets in the event. The measured cross section values are 173.6 +/- 2.1 (stat) +4.5-4.0 (syst) +/- 3.8 (lumi) pb at sqrt(s) = 7 TeV, and 244.9 +/- 1.4 (stat) +6.3-5.5 (syst) +/- 6.4 (lumi) pb at sqrt(s) = 8 TeV, in good agreement with QCD calculations at next-to-next-to-leading-order accuracy. The ratio of the cross sections measured at 7 and 8 TeV is determined, as well as cross sections in the fiducial regions defined by the acceptance requirements on the two charged leptons in the final state. The cross section results are used to determine the top quark pole mass via the dependence of the theoretically predicted cross section on the mass, giving a best result of 173.8 +1.7-1.8 GeV. The data at sqrt(s) = 8 TeV are also used to set limits, for two neutralino mass values, on the pair production of supersymmetric top squarks with masses close to the top quark mass.

Published
2016

10. Measurement of the top quark mass using proton-proton data at(s)=7and 8 TeV

Author

Carlo Battilana, Viacheslav Bunichev, Mikko Voutilainen, Stefaan Tavernier, Daniel Claes, Renjie Wang, Milos Dordevic, Miguel Vidal Marono, Gabriella Pugliese, Altan Cakir, Alberto Escalante del Valle, Kenneth Bloom, Pietro Govoni, Gervasio Gomez, Arie Bodek, Mikhail Dubinin, Ivan Marchesini, Edmilson Manganote, Chang-Seong Moon, Joanne Cole, GIULIA D'IMPERIO, Ted Kolberg, Guenakh Mitselmakher, Lesya Shchutska, Luca Pacher, Colin Bernet, Devdatta Majumder, Caglar Zorbilmez, Lorenzo Viliani, Wesley Smith, Krzysztof Doroba, Erhan Gülmez, Giovanni Abbiendi, Fabrizio Palla, Valentina Sola, Matthias Schröder, Cristina Riccardi, Natalia Lychkovskaya, Manas Maity, Sami Lehti, Valentin Geisler-Knünz, Badder Marzocchi, Borislav Pavlov, Fred Stober, Luke Kreczko, Julio Celso Borello Vargas, Jan Krolikowski, Begona De la Cruz, Jan Steggemann, Stefano Belforte, Nazar Bartosik, Raghav Kunnawalkam Elayavalli, Márton Bartók, Antonio Branca, Shahram Rahatlou, Richard Barbieri, Daniele Fasanella, Ijaz Ahmed, Ramandeep Kumar, Nadia Pastrone, Heiner Tholen, Muhammad Ahmad, Konstantin Androsov, Arun Kumar, Aysel Kayis Topaksu, Artur Kalinowski, Andreas Pfeiffer, Giuseppe Della Ricca, Lucia Silvestris, Christian Scharf, Joern Schwandt, Christopher Tully, Luigi Calligaris, Shimaa AbuZeid, Francisco Javier Cuevas Maestro, Sunil Bansal, Alexander Belyaev, Roman Kogler, Andrea Giammanco, Marco Toliman Lucchini, Guenther Dissertori, Norbert Neumeister, Maria agnese Ciocci, Sara Alderweireldt, Francesca Cavallari, Paolo Maria Montagna, José María Hernández Calama, Efe Yazgan, Hannsjörg Weber, Sinan Sagir, Tomas Lindén, Halil Saka, Luca Cadamuro, Joao Varela, John Stupak III, Florencia Canelli, Manfred Krammer, Cesar Augusto Bernardes, Qiang Li, Ali Fahim, Saeid Paktinat mehdiabadi, Jovan Milosevic, Nicolò Trevisani, Nishu Nishu, Elisabetta Gallo, Tapio Lampén, Dermot Moran, Md Naimuddin, Gustavo Gil Da Silveira, Leonid Levchuk, Claudio Grandi, Enrique Calvo Alamillo, Giovanni Petrucciani, Dayong Wang, Ashim Roy, Alfredo Castaneda Hernandez, Alessandro Di Mattia, Marco Zanetti, Yue Shi Lai, Diego Figueiredo, Sertac Ozturk, Cristina Botta, Martti Raidal, Stefan Piperov, Fedor Ratnikov, Michał Szleper, Richard Hall-Wilton, Paolo Giacomelli, Jay R. Dittmann, Yalcin Guler, Alberto Hernandez Almada, Marcin Konecki, Franco Ligabue, Vitaliano Ciulli, Martina Malberti, Nicolò Tosi, James Wetzel, Jochen Schieck, Silvia Goy Lopez, Nikolaos Manthos, Xin Shi, Salvatore Buontempo, Fabrizio Margaroli, Émilien Chapon, Stéphane PERRIES, JUAN ALCARAZ MAESTRE, Antonio Vilela Pereira, Zhenbin Wu, Matthew Kenzie, Maria Clemencia Mora Herrera, Ilaria Vai, Alessandro Gaz, Sandeep Bhowmik, Cristina Fernández Bedoya, Raffaello D'Alessandro, Markus Seidel, Andre Sznajder, Tamer Elkafrawy, Sergei Shmatov, Pedro Galli Mercadante, Jia Fu Low, Peter Hobson, Rebeca Gonzalez Suarez, Andrea Massironi, Jose Ruiz, Mario Pelliccioni, Caroline Collard, Alexei Safonov, WILLIAM FORD, Jeson Jacob, Wuming Luo, Junghwan Goh, Frederic Ronga, German Ruben Martinez, David Fehling, Rocky Garg, Stephen Mrenna, Panja Luukka, Pablo García Abia, Saranya Samik Ghosh, Caterina Vernieri, Fonseca de Souza Sandro, Mohd Adli MD Ali, Maurizio Pierini, Aurelijus Rinkevicius, Frank Geurts, Isabel Josa Mutuberria, Junquan Tao, Paul Kyberd, Ece ASILAR, David D'Enterria, Adish Vartak, Patrick Dunne, Arabella Martelli, Ezio Torassa, Eric CONTE, Jorma Tuominiemi, James Keaveney, Andrey Popov, Jehad Mousa, Hua Wei, Martin Grunewald, Paolo Spagnolo, Nicholas Wardle, Robert Klanner, Frank Golf, Isidro González Caballero, Mario Merola, Crisostomo Sciacca, Oscar Gonzalez Lopez, Umberto Tamponi, Anna Cimmino, Hengne Li, Tahys Janssen, Pete Markowitz, Qiao Xu, Victor Kim, Robert Bainbridge, Andrea Rizzi, Klaus Rabbertz, Florent Lacroix, Todd Adams, Francesco Fiori, Luigi (Gigi) Rolandi, Andrew Ivanov, Massimo Casarsa, Ioannis Papadopoulos, Greg Landsberg, Sara Fiorendi, Jennifer Ngadiuba, Francesca Ricci-Tam, Ivan Heredia de la Cruz, Andrea Venturi, Bingxuan Liu, Vuko Brigljević, Vittorio Raoul Tavolaro, Terence Libeiro, Pablo Martinez Ruiz del Arbol, Ulascan Sarica, Reddy Pratap Gandrajula, Luca Malgeri, Federico Nguyen, Nicolo Cartiglia, Andrew Brinkerhoff, Lea Caminada, Natalie Heracleous, Leandar Litov, Andrea Gozzelino, Arnd Meyer, Seth Zenz, Sergey Senkin, Alberto Ruiz Jimeno, Michele Gallinaro, Daniele Pedrini, Maria Cruz Fouz Iglesias, Patrizia Barria, Pietro Faccioli, Michail Bachtis, Muhammad Gul, Michele Arneodo, José Flix Molina, Javier Fernandez Menendez, François Lagarde, Alexander Tapper, Maciej Gorski, George Alverson, Lev Dudko, Raffaella Radogna, Yasser Mohammed, Karl Ecklund, Salvatore Costa, Michael Mooney, Paolo Meridiani, Ignacio Redondo, Edgar Carrera Jarrin, Gautier Hamel de Monchenault, Salvatore Rappoccio, Roberta Arcidiacono, Gerrit Van Onsem, Bora Akgun, Thomas Reis, Kunal Kothekar, Anna Colaleo, Lutz Feld, Varun Sharma, Sylvie Braibant-Giacomelli, Joel Goldstein, Paolo Azzurri, Piotr Zalewski, Elsayed Salama, Cristina TUVE', Benedikt Vormwald, Ram Krishna Sharma, Javier Mauricio Duarte, Andreas Hinzmann, KAI-FENG CHEN, Matthias Kasemann, Manfred Paulini, Kevin Lannon, Mithat Kaya, Michael Tytgat, Christian Autermann, Florian Beaudette, Sandra Malvezzi, Nuno Leonardo, Jesus Marco de Lucas, Maxim Titov, Laurent Forthomme, Luca Lista, Jose Enrique Palencia Cortezon, Krzysztof Piotrzkowski, Rainer Wallny, Pietro Vischia, Oliver Buchmueller, Schoefbeck Robert, Maria Isabel Pedraza Morales, Tae Jeong Kim, Marco Pieri, Sunil Manohar Dogra, Shabnam Jabeen, Guido Emilio Tonelli, J.F. Benitez, Luiz Mundim, Jason Lee, Jorgen D'Hondt, Maria Cepeda, Yuri Andreev, Salvatore My, Norraphat Srimanobhas, Dimitri Bourilkov, Silvio Donato, Deborah Pinna, Morgan Lethuillier, Soureek Mitra, Sergio Novaes, Antonio Delgado Peris, Amina Zghiche, Pieter Everaerts, Gurpreet Singh Chahal, Jeffrey Roskes, DAVID ROMERO ABAD, André David Tinoco Mendes, Olga Evdokimov, Pierluigi Bortignon, Shubhanshu Chauhan, Simone Gennai, Luca Brianza, Freya Blekman, Valentina Gori, Raffaele Gerosa, Geoffrey Hall, Eija Tuominen, Marco Paganoni, Marta Felcini, Giacomo ORTONA, Patrice Verdier, Andrei Gritsan, Mercedes Miñano Moya, Marko Dragicevic, Giovanni Zevi Della Porta, Steven Worm, Cristóvão Da Cruz e Silva, Martin Erdmann, Antonio Perez-Calero Yzquierdo, Viola Sordini, Michal Bluj, Roberto Covarelli, Stephanie BARRILLON, KEREM CANKOÇAK, Daniel Bloch, Mojtaba Mohammadi Najafabadi, Joao Seixas, Dilson De Jesus Damiao, Hasan Ogul, Arthur Moraes, Lucas Taylor, Vyacheslav Klyukhin, Francisco Matorras, Mara Soares, FERHAT OZOK, Natalia Korneeva, Jordi Duarte-Campderrós, Ilse Krätschmer, Luca Scodellaro, Marino Missiroli, Jan-Frederik Schulte, Fotios Ptochos, Helen Heath, Wolfgang Waltenberger, Zuhal Seyma Demiroglu, Camilo Carrillo Montoya, Debarati Roy, Alberto Zucchetta, João Rodrigues Antunes, Ralf Ulrich, Guillelmo Gomez-Ceballos, Kadri Ozdemir, Patrizia Azzi, Benjamin Kilminster, Lauri Wendland, Nikola Godinovic, Vladimir Gavrilov, Johannes Haller, Konstantinos Theofilatos, Eliza Melo da Costa, Andrea Davide Benaglia, Sandro Gonzi, Jesus Puerta Pelayo, Monica Vazquez Acosta, Ajay Kumar, Ram Krishna Dewanjee, Christophe Delaere, Sudarshan Paramesvaran, Simon Regnard, YEE HSIUNG, Aaron Dominguez, Nicola Pozzobon, Emanuele Usai, Matthew Herndon, Sasa Micanovic, Alberto Belloni, Piet Verwilligen, Livio Fano', Mariana Shopova, Fabio Ravera, Mauro Donega, Abideh Jafari, Federico De Guio, Luigi Benussi, Jorge Rodriguez, Oliver Gutsche, Nicola Amapane, Francisca Munoz Sanchez, Mauro Emanuele Dinardo, EMINE GÜRPINAR GÜLER, PAO-TI CHANG, Emilio Meschi, Amedeo Staiano, Thiago Rafael Fernandez Perez Tomei, Stefano Colafranceschi, Sudhir Malik, Pedro Manuel Vieira de Castro Ferreira da Silva, Clemens Lange, Bożena Boimska, and Giacomo Sguazzoni

Subjects
Physics, Particle physics, Top quark, Luminosity (scattering theory), Large Hadron Collider, Proton, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Tevatron, 7. Clean energy, 01 natural sciences, Standard Model, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Compact Muon Solenoid, Lepton
Abstract

A new set of measurements of the top quark mass are presented, based on the proton-proton data recorded by the CMS experiment at the LHC at sqrt(s) = 8 TeV corresponding to a luminosity of 19.7 inverse femtobarns. The top quark mass is measured using the lepton+jets, all-jets and dilepton decay channels, giving values of 172.35 +/- 0.16 (stat) +/- 0.48 (syst) GeV, 172.32 +/- 0.25 (stat) +/- 0.59 (syst) GeV, and 172.82 +/- 0.19 (stat) +/- 1.22 (syst) GeV, respectively. When combined with the published CMS results at sqrt(s) = 7 TeV, they provide a top quark mass measurement of 172.44+/- 0.13 (stat) +/- 0.47 (syst) GeV. The top quark mass is also studied as a function of the event kinematical properties in the lepton+jets decay channel. No indications of a kinematic bias are observed and the collision data are consistent with a range of predictions from current theoretical models of ttbar production.

Published
2016

11. Measurement of the charge asymmetry in top quark pair production inppcollisions ats=8 TeVusing a template method

Author

Carlo Battilana, Viacheslav Bunichev, Mikko Voutilainen, Stefaan Tavernier, Daniel Claes, Renjie Wang, Milos Dordevic, Miguel Vidal Marono, Gabriella Pugliese, Altan Cakir, Alberto Escalante del Valle, Kenneth Bloom, Pietro Govoni, Gervasio Gomez, Arie Bodek, Sandro Ventura, Mikhail Dubinin, Ivan Marchesini, Edmilson Manganote, Chang-Seong Moon, GIULIA D'IMPERIO, Ted Kolberg, Ahmed Ali Abdelalim, Guenakh Mitselmakher, Lesya Shchutska, Luca Pacher, Colin Bernet, Devdatta Majumder, Caglar Zorbilmez, Lorenzo Viliani, Wesley Smith, Krzysztof Doroba, Erhan Gülmez, Giovanni Abbiendi, Fabrizio Palla, Valentina Sola, Matthias Schröder, Cristina Riccardi, Natalia Lychkovskaya, Manas Maity, Sami Lehti, Valentin Geisler-Knünz, Badder Marzocchi, Borislav Pavlov, Fred Stober, Luke Kreczko, Julio Celso Borello Vargas, Jan Krolikowski, Begona De la Cruz, Jan Steggemann, Stefano Belforte, Nazar Bartosik, Raghav Kunnawalkam Elayavalli, Márton Bartók, Antonio Branca, Shahram Rahatlou, Richard Barbieri, Daniele Fasanella, Ijaz Ahmed, Ramandeep Kumar, Nadia Pastrone, Heiner Tholen, Muhammad Ahmad, Konstantin Androsov, Arun Kumar, Aysel Kayis Topaksu, Irakli Chakaberia, Artur Kalinowski, Andreas Pfeiffer, Giuseppe Della Ricca, Lucia Silvestris, Joern Schwandt, Christopher Tully, Luigi Calligaris, Shimaa AbuZeid, Sunil Bansal, Alexander Belyaev, Roman Kogler, Andrea Giammanco, Marco Toliman Lucchini, Guenther Dissertori, Daniele Spiga, Norbert Neumeister, Anna Zsigmond, Maria agnese Ciocci, Sara Alderweireldt, Francesca Cavallari, Paolo Maria Montagna, José María Hernández Calama, Efe Yazgan, Hannsjörg Weber, Sinan Sagir, Tomas Lindén, Halil Saka, Luca Cadamuro, John Stupak III, Florencia Canelli, Manfred Krammer, Cesar Augusto Bernardes, Qiang Li, Ali Fahim, Saeid Paktinat mehdiabadi, Jovan Milosevic, Nishu Nishu, Elisabetta Gallo, Tapio Lampén, Dermot Moran, Md Naimuddin, Gustavo Gil Da Silveira, Leonid Levchuk, Claudio Grandi, Enrique Calvo Alamillo, Giovanni Petrucciani, Dayong Wang, Ashim Roy, Alfredo Castaneda Hernandez, Marco Zanetti, Yue Shi Lai, Diego Figueiredo, Sertac Ozturk, Cristina Botta, Martti Raidal, Stefan Piperov, Fedor Ratnikov, Michał Szleper, Richard Hall-Wilton, Paolo Giacomelli, Jay R. Dittmann, Yalcin Guler, Alberto Hernandez Almada, Marcin Konecki, Franco Ligabue, Vitaliano Ciulli, Ayman Mahrous, Martina Malberti, Nicolò Tosi, James Wetzel, Jochen Schieck, Silvia Goy Lopez, Nikolaos Manthos, Xin Shi, Salvatore Buontempo, Fabrizio Margaroli, Émilien Chapon, Stéphane PERRIES, JUAN ALCARAZ MAESTRE, Antonio Vilela Pereira, Zhenbin Wu, Matthew Kenzie, Maria Clemencia Mora Herrera, Ilaria Vai, Alessandro Gaz, Sandeep Bhowmik, Cristina Fernández Bedoya, Raffaello D'Alessandro, Andre Sznajder, Tamer Elkafrawy, Sergei Shmatov, Pedro Galli Mercadante, Jia Fu Low, Peter Hobson, Rebeca Gonzalez Suarez, Andrea Massironi, Jose Ruiz, Mario Pelliccioni, Caroline Collard, Alexei Safonov, WILLIAM FORD, Jeson Jacob, Wuming Luo, Junghwan Goh, Frederic Ronga, German Ruben Martinez, David Fehling, Rocky Garg, Stephen Mrenna, Panja Luukka, Pablo García Abia, Saranya Samik Ghosh, Caterina Vernieri, Fonseca de Souza Sandro, Mohd Adli MD Ali, Maurizio Pierini, Aurelijus Rinkevicius, Frank Geurts, Isabel Josa Mutuberria, Junquan Tao, Paul Kyberd, Ece ASILAR, David D'Enterria, Adish Vartak, Patrick Dunne, Arabella Martelli, Ezio Torassa, Eric CONTE, Jorma Tuominiemi, James Keaveney, Andrey Popov, Jehad Mousa, Hua Wei, Martin Grunewald, Paolo Spagnolo, Nicholas Wardle, Robert Klanner, Frank Golf, Isidro González Caballero, Mario Merola, Crisostomo Sciacca, Oscar Gonzalez Lopez, Umberto Tamponi, Anna Cimmino, Hengne Li, Tahys Janssen, Pete Markowitz, Qiao Xu, Victor Kim, Robert Bainbridge, Andrea Rizzi, Klaus Rabbertz, Florent Lacroix, Todd Adams, Francesco Fiori, Luigi (Gigi) Rolandi, Andrew Ivanov, Massimo Casarsa, Ioannis Papadopoulos, Greg Landsberg, Sara Fiorendi, Jennifer Ngadiuba, Francesca Ricci-Tam, Ivan Heredia de la Cruz, Andrea Venturi, Bingxuan Liu, Vuko Brigljević, Vittorio Raoul Tavolaro, Terence Libeiro, Pablo Martinez Ruiz del Arbol, Reddy Pratap Gandrajula, Luca Malgeri, Federico Nguyen, Andrew Brinkerhoff, Lea Caminada, Natalie Heracleous, Leandar Litov, Andrea Gozzelino, Arnd Meyer, Seth Zenz, Sergey Senkin, Alberto Ruiz Jimeno, Michele Gallinaro, Daniele Pedrini, Maria Cruz Fouz Iglesias, Patrizia Barria, Pietro Faccioli, Michail Bachtis, Muhammad Gul, Michele Arneodo, José Flix Molina, Javier Fernandez Menendez, François Lagarde, Alexander Tapper, Maciej Gorski, Sarah Boutle, George Alverson, Lev Dudko, Raffaella Radogna, Karl Ecklund, Roberta Volpe, Salvatore Costa, Michael Mooney, Paolo Meridiani, Ignacio Redondo, Edgar Carrera Jarrin, Gautier Hamel de Monchenault, Salvatore Rappoccio, Roberta Arcidiacono, Gerrit Van Onsem, Bora Akgun, Thomas Reis, Anna Colaleo, Lutz Feld, Varun Sharma, Sylvie Braibant-Giacomelli, Joel Goldstein, Paolo Azzurri, Piotr Zalewski, Cristina TUVE', Ram Krishna Sharma, Javier Mauricio Duarte, Andreas Hinzmann, KAI-FENG CHEN, Matthias Kasemann, Manfred Paulini, Kevin Lannon, Mithat Kaya, Michael Tytgat, Christian Autermann, Florian Beaudette, Sandra Malvezzi, Nuno Leonardo, Jesus Marco de Lucas, Maxim Titov, Laurent Forthomme, Luca Lista, Jose Enrique Palencia Cortezon, Krzysztof Piotrzkowski, Rainer Wallny, Pietro Vischia, Oliver Buchmueller, Schoefbeck Robert, Maria Isabel Pedraza Morales, Tae Jeong Kim, Marco Pieri, Sunil Manohar Dogra, Shabnam Jabeen, Guido Emilio Tonelli, J.F. Benitez, Luiz Mundim, Jason Lee, Jorgen D'Hondt, Maria Cepeda, Yuri Andreev, Salvatore My, Norraphat Srimanobhas, Dimitri Bourilkov, Silvio Donato, Deborah Pinna, Morgan Lethuillier, Soureek Mitra, Sergio Novaes, Antonio Delgado Peris, Amina Zghiche, Pieter Everaerts, Luc Demortier, Gurpreet Singh Chahal, DAVID ROMERO ABAD, André David Tinoco Mendes, Olga Evdokimov, Pierluigi Bortignon, Shubhanshu Chauhan, Simone Gennai, Luca Brianza, Freya Blekman, Valentina Gori, Raffaele Gerosa, Geoffrey Hall, Eija Tuominen, Marco Paganoni, Marta Felcini, Giacomo ORTONA, Patrice Verdier, Andrei Gritsan, Mercedes Miñano Moya, Marko Dragicevic, Giovanni Zevi Della Porta, Steven Worm, Cristóvão Da Cruz e Silva, Martin Erdmann, Antonio Perez-Calero Yzquierdo, Viola Sordini, Michal Bluj, Roberto Covarelli, Stephanie BARRILLON, KEREM CANKOÇAK, Venkatesh Veeraraghavan, Daniel Bloch, Mojtaba Mohammadi Najafabadi, Joao Seixas, Dilson De Jesus Damiao, Hasan Ogul, Arthur Moraes, Lucas Taylor, Vyacheslav Klyukhin, Francisco Matorras, Mara Soares, FERHAT OZOK, Natalia Korneeva, Jordi Duarte-Campderrós, Ilse Krätschmer, Luca Scodellaro, Marino Missiroli, Jan-Frederik Schulte, Fotios Ptochos, Helen Heath, Wolfgang Waltenberger, Camilo Carrillo Montoya, Debarati Roy, Alberto Zucchetta, João Rodrigues Antunes, Ralf Ulrich, Guillelmo Gomez-Ceballos, Kadri Ozdemir, Patrizia Azzi, Benjamin Kilminster, Lauri Wendland, Nikola Godinovic, Vladimir Gavrilov, Johannes Haller, Konstantinos Theofilatos, Eliza Melo da Costa, Andrea Davide Benaglia, Sandro Gonzi, Jesus Puerta Pelayo, Monica Vazquez Acosta, Ajay Kumar, Ram Krishna Dewanjee, Christophe Delaere, Sudarshan Paramesvaran, Simon Regnard, YEE HSIUNG, Aaron Dominguez, Nicola Pozzobon, Emanuele Usai, Matthew Herndon, Sasa Micanovic, Alberto Belloni, Piet Verwilligen, Livio Fano', Mariana Shopova, Fabio Ravera, Mauro Donega, Abideh Jafari, Federico De Guio, Luigi Benussi, Jorge Rodriguez, Oliver Gutsche, Nicola Amapane, Francisca Munoz Sanchez, Mauro Emanuele Dinardo, EMINE GÜRPINAR GÜLER, PAO-TI CHANG, Emilio Meschi, Amedeo Staiano, Thiago Rafael Fernandez Perez Tomei, Stefano Colafranceschi, Sudhir Malik, Pedro Manuel Vieira de Castro Ferreira da Silva, Clemens Lange, Bożena Boimska, and Giacomo Sguazzoni

Subjects
Quark, Physics, Top quark, Particle physics, Muon, 010308 nuclear & particles physics, media_common.quotation_subject, High Energy Physics::Phenomenology, 01 natural sciences, 7. Clean energy, Asymmetry, Bottom quark, Hadronization, Nuclear physics, Pair production, 0103 physical sciences, High Energy Physics::Experiment, B meson, Nuclear Experiment, 010306 general physics, media_common
Abstract

The charge asymmetry in the production of top quark and antiquark pairs is measured in proton-proton collisions at a center-of-mass energy of 8 TeV. The data, corresponding to an integrated luminosity of 19.6 inverse femtobarns, were collected by the CMS experiment at the LHC. Events with a single isolated electron or muon, and four or more jets, at least one of which is likely to have originated from hadronization of a bottom quark, are selected. A template technique is used to measure the asymmetry in the distribution of differences in the top quark and antiquark absolute rapidities. The measured asymmetry is A[c,y] = [0.33 +/- 0.26 (stat) +/- 0.33 (syst)]%, which is the most precise result to date. The results are compared to calculations based on the standard model and on several beyond-the-standard-model scenarios.

Published
2016

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