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2,655 results on '"Dixon, L"'

3. COVID-19 Stroke Apical Lung Examination Study 2: a national prospective CTA biomarker study of the lung apices, in patients presenting with suspected acute stroke (COVID SALES 2)

Author

Ratneswaren, T., Chan, N., Aeron-Thomas, J., Sait, S., Adesalu, O., Alhawamdeh, M., Benger, M., Garnham, J., Dixon, L., Tona, F., McNamara, C., Taylor, E., Lobotesis, K., Lim, E., Goldberg, O., Asmar, N., Evbuomwan, O., Banerjee, S., Holm-Mercer, L., Senor, J., Tsitsiou, Y., Tantrige, P., Taha, A., Ballal, K., Mattar, A., Daadipour, A., Elfergani, K., Barker, R., Chakravartty, R., Murchison, A.G., Kemp, B.J., Simister, R., Davagnanam, I., Wong, O.Y., Werring, D., Banaras, A., Anjari, M., Mak, J.K.C., Falzon, A.M., Rodrigues, J.C.L., Thompson, C.A.S., Haines, I.R., Burnett, T.A., Zaher, R.E.Y., Reay, V.L., Banerjee, M., Sew Hee, C.S.L., Oo, A.P., Lo, A., Rogers, P., Hughes, T., Marin, A., Mukherjee, S., Jaber, H., Sanders, E., Owen, S., Bhandari, M., Sundayi, S., Bhagat, A., Elsakka, M., Hashmi, O.H., Lymbouris, M., Gurung-Koney, Y., Arshad, M., Hasan, I., Singh, N., Patel, V., Rahiminejad, M., and Booth, T.C.

Published
2024
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4. Language and Content Outcomes of CLIL and EMI: A Systematic Review

Author

Graham, Keith Mathew, Choi, Yunkyeong, Davoodi, Amin, Razmeh, Shakiba, and Dixon, L. Quentin

Abstract

Around the world, language teachers are shifting to content-based instruction (CBI) as a way to teach English, most commonly in the form of Content and Language Integrated Learning (CLIL) or English-Medium Instruction (EMI). With the spread of CBI around the world, it is important to understand how this shift in teaching has affected student outcomes. Using a systematic literature review approach, this study examines current literature on the effect of CBI on language and content outcomes. Twenty-five articles met the inclusion criteria for this study and were examined. The results show mixed findings on the effectiveness of CBI on student outcomes, with the majority of studies showing either positive or neutral effects for CBI when compared with non-CBI classrooms. However, the study also reveals multiple methodological issues that cause difficulties for any strong conclusions about CBI to be made. In addition, while CLIL in Spain has received a lot of research attention, other countries remain understudied. Therefore, this study concludes with a call for future research of CBI outcomes that examine a variety of countries and account for the methodological flaws identified.

Published
2018

5. PreciSSIon: a collaborative initiative to reduce surgical site infections after elective colorectal surgery

Author

Holden, K., Walker, D., Pitts, K., Bertman, K., Glancy, D., Andrews, S., Vallance, A., Smith, A., Koczorowski, W., Woodridge, A., Thurston, L., Lim, J., Robinson, N., Hopkins, J., Gane, D., Rodgers, J., Cope, G., Dalton, S., Goss, C., Harvey, N., Short, S., Logan, S., Shabbir, J., Panes, L., Chandratreya, N., O’Keeffe, M., Clayphan, B., Dixon, L., Biggs, S., Jordan, L., and Pullyblank, A.

Published
2022
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6. The relationship of home language and literacy practices to biliteracy development among immigrant bilingual children: A review of studies from 2014 to 2023.

Author

Dixon, L. Quentin, Kim, Haemin, Dayani, Amirpooya, Guo, Weiqi, Kuo, Li‐Jen, Eslami, Zohreh, and Chen, Zhuo

Subjects
*CHILDREN of immigrants, *IMMIGRANT children, *IMMIGRANT families, *CHILDREN'S language, *LANGUAGE acquisition
Abstract

Immigrant families bring myriad strengths through their home literacy practices, which contribute to their children's biliteracy growth. This systematic review critically analysed 28 recent studies on the relationship between home literacy practices and biliteracy development of immigrant bilingual children. Against a backdrop of host societies that emphasize immigrant children's second language (L2) and devalue their first language (L1), many studies indicated that home literacy practices in either L1 or L2 were associated with stronger literacy development in the same language for immigrant children of varying ages and language backgrounds at the same time point; further, cross‐linguistic relationships seemed to be neutral or negative, mostly measured at one point in time. However, these findings should not be taken as recommendations, as very few studies examined these relationships longitudinally or accounted for change in home practices. Additionally, other factors, such as school programmes, socioeconomic status (SES) and length of residence in the host country, may affect these relationships. Importantly, L1 generally required more support in order to develop in these contexts, but a few longitudinal studies suggest that L1 development need not come at the expense of L2 achievement. Additional experimental and longitudinal studies that value immigrant families' L1s are needed to elucidate these relationships. [ABSTRACT FROM AUTHOR]

Published
2024
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7. Breadth or Depth: The Role of Vocabulary in Chinese English-Language Beginning Writers' Development

Author

Wu, Shuang, Quentin Dixon, L., Sun, Haitao, and Zhang, Peng

Abstract

This study examines the relationship between developing writer's vocabulary breadth, vocabulary depth, and writing abilities. Participants were EFL Chinese junior-high students, of whom there were 120 Grade 8 and 147 Grade 9 students. Measures included tests of vocabulary size, word association, and morphological awareness. Students' writing samples were coded with a five-point rubric covering six categories: focus and idea generation, organization, word choice, grammar, sentence fluency, and length of writing samples. Standard multiple regression analyses showed that vocabulary breadth made a bigger contribution to writing performance among the EFL 8th and 9th graders, whether the outcome variable was the overall writing quality or individual groups of scoring components. In addition, some aspects of vocabulary depth such as adjective synonyms were only related to the 9th graders' writing performance, suggesting that depth of vocabulary may exert a growing impact on EFL learners' writing development. These findings support the need for systematic vocabulary instruction in EFL classrooms, as it can optimize the strong relationship between vocabulary breadth and depth and their impact on writing development.

Published
2021
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10. Interference effects in the $H(\rightarrow \gamma\gamma) + 2$ jets channel at the LHC

Author

Coradeschi, F., de Florian, D., Dixon, L. J., Fidanza, N., Hoeche, S., Ita, H., Li, Y., and Mazzitelli, J.

Subjects
High Energy Physics - Phenomenology
Abstract

We compute the interference between the resonant process $pp\to H(\rightarrow \gamma\gamma)+2 \text{ jets}$ and the corresponding continuum background at leading order in QCD. For the Higgs signal, we include gluon fusion (GF) and vector boson fusion (VBF) production channels, while for the background we consider all tree-level contributions, including pure EW effects (${\cal O}(\alpha_{QED}^4)$) and QCD contributions (${\cal O}(\alpha_{QED}^2 \alpha_{s}^2)$), plus the loop-induced gluon-initiated process. After convolution with the experimental mass resolution, the main effect of the interference is to shift the position of the mass peak, as in the inclusive GF case studied previously. The apparent mass shift is small in magnitude but strongly dependent on the Higgs width, potentially allowing for a measurement of, or bound on, the width itself. In the $H(\rightarrow \gamma\gamma)+2 \text{ jets}$ channel, the VBF and GF contributions generate shifts of opposite signs which largely cancel, depending on the sets of cuts used, to as little as 5 MeV (toward a lower Higgs mass). The small magnitude of the shift makes this channel a good reference mass for measuring the inclusive mass shift of around 60 MeV in the Standard Model., Comment: 7 pages, 7 figures. v2: Conclusions added and references updated. To be published in PRD

Published
2015
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11. An Updated Review on Use of L1 in Foreign Language Classrooms

Author

Shin, Jee-Young, Dixon, L. Quentin, and Choi, Yunkyeong

Abstract

This article aims to provide a comprehensive perspective on the use of first language (L1) in foreign language (FL) classrooms by reviewing recently published empirical literature from 2011 through 2018. The article focuses on literature relevant to four key areas: (1) extent and impact of L1 use; (2) factors influencing L1 and second language (L2) use; (3) beliefs and attitudes towards L1 and L2 use; and (4) the effectiveness of L1 use on L2 skills. The overall findings suggest making use of L1 as a resource integrated into the curriculum, aiming for the judicious and intentional use of L1. Re-conceptualising the nature of L1 use is suggested, as well as ways to encourage efficient use of L1 to maximise L2 learning in the classroom are outlined. Furthermore, workshops are discussed for teachers and students to be empowered and to have an agency for their teaching and learning. Future studies on understanding of translanguaging and pedagogical use of translanguaging in FL education are needed.

Published
2020
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13. Extrapolating W-Associated Jet-Production Ratios at the LHC

Author

Bern, Z., Dixon, L. J., Cordero, F. Febres, Hoeche, S., Kosower, D. A., Ita, H., and Maitre, D.

Subjects
High Energy Physics - Phenomenology
Abstract

Electroweak vector-boson production, accompanied by multiple jets, is an important background to searches for physics beyond the Standard Model. A precise and quantitative understanding of this process is helpful in constraining deviations from known physics. We study four key ratios in $W + n$-jet production at the LHC. We compute the ratio of cross sections for $W + n$- to $W + (n-1)$-jet production as a function of the minimum jet transverse momentum. We also study the ratio differentially, as a function of the $W$-boson transverse momentum; as a function of the scalar sum of the jet transverse energy, $H_T^{\rm jets}$; and as a function of certain jet transverse momenta. We show how to use such ratios to extrapolate differential cross sections to $W+6$-jet production at next-to-leading order, and we cross-check the method against a direct calculation at leading order. We predict the differential distribution in $H_T^{\rm jets}$ for $W+6$ jets at next-to-leading order using such an extrapolation. We use the BlackHat software library together with SHERPA to perform the computations., Comment: RevTex, 60 pages, 25 tables, 19 figures

Published
2014
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14. Universality in W+Multijet Production

Author

Bern, Z., Dixon, L. J., Cordero, F. Febres, Hoeche, S., Ita, H., Kosower, D. A., Maitre, D., and Ozeren, K. J.

Subjects
High Energy Physics - Phenomenology
Abstract

We study $W$-boson production accompanied by multiple jets at 7 TeV at the LHC. We study the jet-production ratio, of total cross sections for $W$+$n$- to $W$+($n-1$)-jet production, and the ratio of distributions in the total transverse hadronic jet energy $H_{\rm T}^{\rm jets}$. We use the ratios to extrapolate the total cross section, and the differential distribution in $H_{\rm T}^{\rm jets}$, to $W$+6-jet production. We use the BlackHat software library in conjunction with SHERPA to perform the computations., Comment: Merge of Moriond 2014 and Loops & Legs 2014 proceedings, 6 pages, 2 figures

Published
2014

15. Next-to-Leading Order Gamma Gamma + 2-Jet Production at the LHC

Author

Bern, Z., Dixon, L. J., Cordero, F. Febres, Hoeche, S., Ita, H., Kosower, D. A., Presti, N. A. Lo, and Maitre, D.

Subjects
High Energy Physics - Phenomenology
Abstract

We present next-to-leading order QCD predictions for cross sections and for a comprehensive set of distributions in diphoton + 2-jet production at the Large Hadron Collider. We consider the contributions from loop amplitudes for two photons and four gluons, but we neglect top quarks. We use BlackHat together with SHERPA to carry out the computation. We use a Frixione cone isolation for the photons. We study standard sets of cuts on the jets and the photons, and also sets of cuts appropriate for studying backgrounds to Higgs-boson production via vector-boson fusion., Comment: RevTex, 20 figures, 16 tables

Published
2014
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16. Understanding Language Learning: Review of the Application of the Interaction Model in Foreign Language Contexts

Author

Dixon, L. Quentin and Wu, Shuang

Abstract

Purpose: This paper examined the application of the input-interaction-output model in English-as-Foreign-Language (EFL) learning environments with four specific questions: (1) How do the three components function in the model? (2) Does interaction in the foreign language classroom seem to be effective for foreign language acquisition? (3) What factors might facilitate/impede interaction, which, in turn, positively or negatively affect output? (4) What are effective teaching methods to enhance interaction and ensure quality of output? Methodology: A systematic search for empirical studies was conducted in the selected databases, which yielded 26 studies from different parts of the world. These studies met the preset criteria concerning medium of instruction, setting, relevancy and quality. Findings: The review demonstrated that when input, interaction and output worked together, positive English learning results were achieved by EFL learners. In addition, the relationship among input, interaction, and output was likely to be influenced by such factors as language environment, task type, gender, and language proficiency. The review also showed that in the face of diversified forms of interaction, EFL teachers were capable of efficiently implementing different teaching strategies. Significance: The review not only lends support to the applicability of the interaction model in foreign language contexts, but also suggests from the pooled evidence, effective ways to apply the model in the EFL class. These findings can be used to help launch educational campaigns promoting the application of the interaction model within the EFL classroom.

Published
2014

17. Next-to-leading order diphoton+2-jet production at the LHC

Author

Bern, Z., Dixon, L. J., Cordero, F. Febres, Hoeche, S., Ita, H., Kosower, D. A., Presti, N. A. Lo, and Maitre, D.

Subjects
High Energy Physics - Phenomenology
Abstract

We present results from a recent calculation of prompt photon-pair production in association with two jets to next-to-leading order (NLO) at the LHC. The virtual contribution is evaluated using the BlackHat library, a numerical implementation of on-shell methods for one-loop amplitudes, in conjunction with SHERPA. We study four sets of cuts: standard jet cuts, a set of Higgs-related cuts suggested by ATLAS, and corresponding sets which isolate the kinematic region where the process becomes the largest background to Higgs production via vector-boson fusion., Comment: 10 pages, 4 figures, Presented at 11th International Symposium on Radiative Corrections (RADCOR 2013), 22-27 September 2013, Lumley Castle Hotel, Durham, UK

Published
2013

18. Ntuples for NLO Events at Hadron Colliders

Author

Bern, Z., Dixon, L. J., Cordero, F. Febres, Hoeche, S., Ita, H., Kosower, D. A., and Maitre, D.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

We present an event-file format for the dissemination of next-to-leading-order (NLO) predictions for QCD processes at hadron colliders. The files contain all information required to compute generic jet-based infrared-safe observables at fixed order (without showering or hadronization), and to recompute observables with different factorization and renormalization scales. The files also make it possible to evaluate cross sections and distributions with different parton distribution functions. This in turn makes it possible to estimate uncertainties in NLO predictions of a wide variety of observables without recomputing the short-distance matrix elements. The event files allow a user to choose among a wide range of commonly-used jet algorithms and jet-size parameters. We provide event files for a $W$ or $Z$ boson accompanied by up to four jets, and for pure-jet events with up to four jets. The files are for the Large Hadron Collider with a center of mass energy of 7 or 8 TeV. A C++ library along with a Python interface for handling these files are also provided and described in this article. The library allows a user to read the event files and recompute observables transparently for different pdf sets and factorization and renormalization scales., Comment: 43 pages, 6 tables

Published
2013
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19. The Future of U.S. Particle Theory: Report of the DPF Theory Panel

Author

Dine, M., Babu, K., Csaki, C., Dawson, S., Dixon, L., Gottlieb, S., Harvey, J., and Whiteson, D.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment, High Energy Physics - Lattice, High Energy Physics - Theory
Abstract

This report summarizes the findings of the DPF Theory Panel which was formed with a goal of understanding the scientific problems and opportunities of the next decade, as well as the challenges involved in sustaining a first-class program in theoretical particle physics research in the United States., Comment: 23 pages, LaTeX, Chapter 5 of the report "Planning the Future of U.S. Particle Physics (Snowmass 2013)"

Published
2013

20. The BlackHat Library for One-Loop Amplitudes

Author

Bern, Z., Dixon, L. J., Cordero, F. Febres, Hoeche, S., Ita, H., Kosower, D. A., Maitre, D., and Ozeren, K. J.

Subjects
High Energy Physics - Phenomenology
Abstract

We present recent next-to-leading order (NLO) results in perturbative QCD obtained using the BlackHat software library. We discuss the use of n-tuples to separate the lengthy matrix-element computations from the analysis process. The use of n-tuples allows many analyses to be carried out on the same phase-space samples, and also allows experimenters to conduct their own analyses using the original NLO computation., Comment: Talk given at ACAT 2013, Beijing, China, May 16--21, 2013; 6 pages, 2 figures; added references

Published
2013
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21. High multiplicity W+jets predictions at NLO

Author

Bern, Z., Dixon, L. J., Cordero, F. Febres, Höche, S., Ita, H., Kosower, D. A., Ozeren, K. J., and Maître, D.

Subjects
High Energy Physics - Phenomenology
Abstract

In these proceedings we present results from a recent calculation for the production of a W boson in conjunction with five jets at next-to-leading order in perturbative QCD. We also use results at lower multiplicities to extrapolate the cross section to the same process with six jets., Comment: 5 pages, Proceedings for the DIS2013 conference

Published
2013

22. Next-to-Leading Order W + 5-Jet Production at the LHC

Author

Bern, Z., Dixon, L. J., Cordero, F. Febres, Hoeche, S., Ita, H., Kosower, D. A., Maitre, D., and Ozeren, K. J.

Subjects
High Energy Physics - Phenomenology
Abstract

We present next-to-leading order QCD predictions for the total cross section and for a comprehensive set of transverse-momentum distributions in W + 5-jet production at the Large Hadron Collider. We neglect the small contributions from subleading-color virtual terms, top quarks and some terms containing four quark pairs. We also present ratios of total cross sections, and use them to obtain an extrapolation formula to an even larger number of jets. We include the decay of the $W$ boson into leptons. This is the first such computation with six final-state vector bosons or jets. We use BlackHat together with SHERPA to carry out the computation., Comment: RevTex, 27 pages, 7 figures, v2 minor corrections and corrected references

Published
2013
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23. 2. African swine fever virus: cellular and molecular aspects

Author

Urbano, A., primary, Forth, J.H., additional, Olesen, A.S., additional, Dixon, L., additional, Rasmussen, T.B., additional, Cackett, G., additional, Werner, F., additional, Karger, A., additional, Andrés, G., additional, Wang, X., additional, Perez-Nuñez, D., additional, Galindo, I., additional, Malogolovkin, A., additional, Revilla, Y., additional, Alonso, C., additional, Gallardo, C., additional, Blome, S., additional, Arabyan, E., additional, Zakaryan, H., additional, and Ferreira, F., additional

Published
2021
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24. Intensive blood pressure reduction with intravenous thrombolysis therapy for acute ischaemic stroke (ENCHANTED): an international, randomised, open-label, blinded-endpoint, phase 3 trial

Author

Anderson, Craig S., Huang, Yining, Lindley, Richard I., Chen, Xiaoying, Arima, Hisatomi, Chen, Guofang, Li, Qiang, Billot, Laurent, Delcourt, Candice, Bath, Philip M., Broderick, Joseph P., Demchuk, Andrew M., Donnan, Geoffrey A., Durham, Alice C., Lavados, Pablo M., Lee, Tsong-Hai, Levi, Christopher, Martins, Sheila O., Olavarria, Veronica V., Pandian, Jeyaraj D., Parsons, Mark W., Pontes-Neto, Octavio M., Ricci, Stefano, Sato, Shoichiro, Sharma, Vijay K., Silva, Federico, Song, Lili, Thang, Nguyen H., Wardlaw, Joanna M., Wang, Ji-Guang, Wang, Xia, Woodward, Mark, Chalmers, John, Robinson, Thompson G., Kim, Jong S., Stapf, Christian, Simes, R. John, Hankey, Graeme J., Sandercock, Peter, Bousser, Marie-Germaine, Wong, K.S. Lawrence, Scaria, Anish, Hirakawa, Yoichiro, Moullaali, Tom J., Carcel, Cheryl, Gordon, Penny, Fuentes-Patarroyo, Sully X., Benito, Dino, Chen, Ruiqi, Cao, Yongjun, Kunchok, Amy, Winters, Stephen, Coutts, Shelagh, Yoshimura, Sohei, You, Shoujiang, Yang, Jie, Wu, Guojun, Zhang, Shihong, Manning, Lisa, Mistri, Amit, Haunton, Victoria, Minhas, Jatinder, Malavera, Alejandra, Lim, Joyce, Liu, Leibo, Kumar, Namrata N., Tay, Nicole, Jenson, Kerry, Richtering, Sarah, Tucker, Sharon, Knight, Elizabeth, Ivanova, Elizaveta, Thembani, Emma, Odgers, Elizabeth, Sanders, Elizabeth, Small, Sabrina, Vaghasiya, Ruchita, Armenis, Manuela, Donnelly, Paul, Baig, Merza A., Blacklock, Nick, Naidu, Bala, Monaghan, Helen, Smith, Phillipa, Glass, Parisa, Bai, Xuejie, Li, Qiancheng, Zhu, Pingping, Kong, Liang, He, Ruihong, Zhao, He, Lv, Jiajie, Jia, Haijing, Xi, Zhen, Cong, Yuhan, Cui, Buliang, Deng, Hua, Guo, Ying, He, Lingyu, Jia, Ruolan, Li, Nan, Li, Wei, Liu, Mengxiao, Zhang, Meng, Xu, Ziwei, Zhang, Ting, Zhao, Yan, Gregory, Philip, In, Yunjeong, Kim, Su J., Ahn, Jung E., Kim, Sul H., Hong, Young L., González-McCawley, Francisca, Martins, Magda C.O., Portales, Bernardita, Wang, Ching-Yi, Ryu, Shan-Jen, Aujla, Hardeep, Lewin, Sue, Kumar, Tracy, Barrows, Sara, Ebraimo, Ahtasam, Uyen, Hong H., Giang, Nguyen A., Linh, Le T.M., An, Le T.T., Phuong, Do M., Ngoc, Pham V.B., Hang, Nguyen M., Tran, Nguyen T.B., Hien, Ha T.T., Yen, Mai B., Tram, Ngo T.B., Truc, Tran T.T., Hoa, Nguyen A., Thuan, Nguyen T.B., Oanh, Ha T.K., Arora, Deepti, Verma, Shweta J., Krause, M., Priglinger, M., Day, S., Jala, S., Davies, L., Ray, E., Celestino, S., Law, L.Y., Wijeratne, T., Ng, G., Nagao, K., Weiss, G., Titton, N., Batista, C., Zãn, D., Carbonera, L., Ferreira, K., Castro, R., Martins Filho, R.K., Carvalho, M., Libardi, M., Martins, G., Fagundes, D., Baron, G., Boehringer, A., Barbosa, J., Bazan, R., Braga, G., Luvizutto, G., Ribeiro, P., Winckler, F., Moro, C., Longo, A., Liberato, R., Barbosa, R., Magalhães, P., Portal, M., Martin, K., Souza, A., Cuervo, D., Perin, D., Marques, L., Oliveira, F., Battaglini, M., Lourenço, F., Silva, G., Duarte, L., Alves, M., Sousa, J., Uhehara, M., Brunser, A., Mazzón, E., Spencer, M., Acosta, I., Rojo, A., Rivas, R., Klapp, C., Carvallo, L., Carvallo, P., Mansilla, E., Flores, J., Alvarado, M., Herrera, A., Reyes, C., Jurado, F., Bustamante, G., Bravo, L., Matamala, J.M., Guerrero, R., Zhou, S., Ping, L., Liu, W., Liu, L., Tian, Y., Xu, H., Wang, J., Wang, L., Zhen, Z., Zhang, J., Yan, M., Zhang, Q., Tao, X., Liu, C., Shi, J., Zhang, X., Tai, L., Xu, L., Lu, H., Nie, H., Li, X., Zhou, J., Liu, Y., Gong, P., Zhao, H., Li, R., Wang, X., Chen, Q., Li, Y., Wu, L., Jia, L., Guo, X., Chen, G., Lin, B., Zhu, W., Yang, K., Zhang, Z., Xie, C., Wu, D., Wang, Y., Liu, D., Liu, Z., Liang, L., Cao, Q., Xia, J., Weng, Y., Li, J., Xu, T., Geng, D., Yan, X., Wang, D., Zhao, N., Tang, Z., Yin, W., Wang, S., Huang, W., Yang, Y., Song, A., Hao, Y., Zhang, A., Qiao, B., Yang, J., Yan, H., Wei, X., Tao, Z., Liu, H., Lv, Y., Yang, H., Han, L., Mao, X., Ge, L., Zhang, Y., He, S., Jiang, J., Wu, W., Wang, H., Yang, L., Tang, Y., Sun, H., Li, F., Li, G., Sun, Y., Zhang, H., Wu, Y., Huang, L., Geng, C., Jin, Z., Zhu, J., Zhang, F., Zheng, R., Shen, H., Liu, F., Chen, C., Chen, S., Zhou, L., Hu, B., Zou, Z., Liu, J., Chang, X., Zhang, S., Huang, Q., Liu, X., Liu, S., He, W., Feng, J., Li, L., Chen, X., Zhuang, X., Zheng, W., Lai, Y., Zhou, Y., Duan, H., Yang, Q., Du, J., Lin, Q, Xu, E., Zhan, L., Wu, J., Feng, X., Wei, C., He, J., Wang, B., Li, W, Chen, P, Guo, F, Dai, H, Dai, M, Zeng, X., Chen, B., Long, F., Su, Q., Bao, B., Wu, T., Wu, X., Shao, Y., Li, S., Xu, Y., Castellanos, J.A., Muñoz-Collazos, M., Solano, E., Leung, W.H.T., Sureshbabu, S., Sharma, S.N., George, S., Shekhar, S., Singla, S., Saini, L., Sunita, Kate, M., Sarvotham, R., William, A.G., Deepak, A., BK, M., Benny, R., Bolegave, V., Basle, M., Gore, S., George, P., Kumaravelu, S., Rahamath, S., Raj, P.G., Devi, A.R., Sharma, A., Prajapati, J., Parmar, M., Patel, D., Panchal, T., Gorthi, S.P., Prabhu, V., Prabhu, A., Chandran, V., Chatterjee, A., Nair, R., Nambiar, V.K., TS, D., TP, S., Ajai, V., Paul, S., Natarajan, P.C., Chittibabu, D., Borah, N.C., Ghose, M., Choudhury, N., Gohain, P., Kalita, K., Duberkar, D., Pawar, N., Bhaviskar, R., Caterbi, E., Cenciarelli, S., Condurso, R., Gallinella, E., Greco, L., Marando, C., Mastrocola, S., Mattioni, A., Sacchini, E., Sicilia, I., Gallina, A., Giannandrea, D., Marsili, E., Mazzoli, T., Padiglioni, C., Corea, F., Guidubaldi, A., Micheli, S., Barbi, M., Kim, J., Song, H.J., Jeong, H.S., Lim, J.G., Park, S.M., Lee, K.B., Hwang, H.W., Kwon, S.U., Kang, D.W., Kim, Y.J., Kim, B.J., Park, J.M., Kang, K., Kim, B., Kwon, O., Kim, Y.W., Lee, J.J., Hwang, Y.H., Kwon, H.S., Koo, J., Lee, K., Kim, T., Ahn, A., Rha, J.H., Park, H.K., Yoon, C.W., Chan, B., Teoh, H.L., Paliwal, P., Wong, L.Y.J., Chen, J.T., De Silva, D.A., Chang, H.M., Fabiaña, N., Marti, J., Delgado, R., Martínez, A., Prats, L., Camps, P., Liou, C.W., Tan, T.Y., Liu, C.F., Cheng, H.H., Po, H.L., Lin, Y.J., Chou, C.L., Lin, C.H., Yen, C.C., Chang, Y.T., Hsu, Y.T., Lee, J.D., Lee, M., Huang, Y.C., Wu, C.Y., Suwanwela, N.C., Chutinet, A., Likitjaroen, Y., Roongpiboonsopit, D., Charnwut, S., Dyker, A., Hossain, M., Muddegowda, G.K., Sanyal, R., Roffe, C., Natarajan, I., Finney, K., Sztriha, L., Teo, J., Chan, F.K., Lim, J., Chitando, B., Clarke, B., Patel, B., Khan, U., Ghatala, R., Trippier, S., Kalra, L., Manawadu, D., Sikondari, N., Aeron-Thomas, J., Sunman, W., Wilkes, G., Richardson, C., Buch, A., Jackson, B., Halse, O., Mashate, S., Wilding, P., Nguyen, V., Qadiri, M.R., Rashed, K., Board, S., Buckley, C., Smith, C., James, M., Keenan, S., Bouring, A., England, T., Donnelly, R., Scott, J., Maddula, M., Beavan, J., Perry, R., Francia, N., Watchhurst, C., Banaras, A., Ashton, A., Mistri, A., Musarrat, K., Eveson, D., Kallingal, J., Perez, J., Harrison, L., Marsden, T., Furnace, J., Clarke, R., Reid, J., Warburton, E., Macleod, M.J., Mitchell, J., Day, D., Church, N., Amis, E., Price, C., Rodgers, H., Whiting, R., Hussain, M., Harvey, M., Brown, S., Foot, J., Tryambake, D., Broughton, D., Bergin, A., Annamalai, A., Dixon, L., Weir, N., Blank, C., Harkness, K., Ali, A., Richards, E., Stocks, K., Bruce, D.W., Wani, M., Anjum, T., Krishnan, M., Nguyen Huy, T., Le Tuan, A. Truong, Cam, L. Dam Thi, Kim, T. Ngo Thi, Nguyen, B. Pham, Dat, A. Nguyen, Van, C. Nguyen, Duy, T. Mai, Viet, P. Dao, Tien, D. Nguyen, Van, T. Vo, Le Kim, K., Ngoc, T. Bui, Le Thanh, T. Tran, Hoanh, S. Nguyen, Phuoc, S. Pham, Van, T. Tran, Thi, B. Doan, Thu, H. Nguyen Thi, Duy, M. Nguyen, Van, D. Ngo, Anderson, Craig S, Lindley, Richard I, Bath, Philip M, Broderick, Joseph P, Demchuk, Andrew M, Donnan, Geoffrey A, Durham, Alice C, Lavados, Pablo M, Martins, Sheila O, Olavarria, Veronica V, Pandian, Jeyaraj D, Parsons, Mark W, Pontes-Neto, Octavio M, Sharma, Vijay K, Thang, Nguyen H, Wardlaw, Joanna M, and Robinson, Thompson G

Published
2019
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26. Missing Energy and Jets for Supersymmetry Searches

Author

Bern, Z., Diana, G., Dixon, L. J., Cordero, F. Febres, Hoeche, S., Ita, H., Kosower, D. A., Maitre, D., and Ozeren, K. J.

Subjects
High Energy Physics - Phenomenology
Abstract

We extend our investigation of backgrounds to new physics signals, following CMS's data-driven search for supersymmetry at the LHC. The aim is to use different sets of cuts in gamma + 3-jet production to predict the irreducible Z + 3-jet background (with the Z boson decaying to neutrinos) to searches with missing transverse energy + 3-jet signal topologies. We compute ratios of Z + 3-jet to gamma + 3-jet production cross sections and kinematic distributions at next-to-leading order (NLO) in alpha_s. We compare these ratios with those obtained using a parton shower matched to leading-order matrix elements (ME+PS). This study extends our previous work [arXiv:1106.1423 [hep-ph]] on the Z + 2-jet to gamma + 2-jet ratio. We find excellent agreement with the ratio determined from the earlier NLO results involving two instead of three jets, and agreement to within 10% between the NLO and ME+PS results for the ratios. We also examine the possibility of large QCD logarithms in these processes. Ratios of Z + n-jet to gamma + n-jet cross sections are plausibly less sensitive to such corrections than the cross sections themselves. Their effect on estimates of Z + 3-jet to gamma + 3-jet ratios can be assessed experimentally by measuring the gamma + 3-jet to gamma + 2-jet production ratio in search regions. We partially address the question of potentially large electroweak logarithms by computing the real-emission part of the electroweak corrections to the ratio using ME+PS, and find that it is 1% or less. Our estimate of the remaining theoretical uncertainties in the Z to gamma ratio is in agreement with our earlier study., Comment: 32 pages, 10 figures, 8 tables, RevTeX

Published
2012
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27. NLO vector boson production with light jets

Author

Bern, Z., Diana, G., Dixon, L. J., Cordero, F. Febres, Forde, D., Gleisberg, T., Hoeche, S., Ita, H., Kosower, D. A., Maitre, D., and Ozeren, K.

Subjects
High Energy Physics - Phenomenology
Abstract

In this contribution we present recent progress in the computation of next-to-leading order (NLO) QCD corrections for the production of an electroweak vector boson in association with jets at hadron colliders. We focus on results obtained using the virtual matrix element library BLACKHAT in conjunction with SHERPA, focusing on results relevant to understanding the background to top production., Comment: 4+2 epsilon pages, Submitted for the proceedings of TOP2011 - 4th International Workshop on Top Quark Physics, 25-30th September 2011, Sant Feliu de Guixols, Spain

Published
2012
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28. Simplifying Multiloop Integrands and Ultraviolet Divergences of Gauge Theory and Gravity Amplitudes

Author

Bern, Z., Carrasco, J. J. M., Dixon, L. J., Johansson, H., and Roiban, R.

Subjects
High Energy Physics - Theory
Abstract

We use the duality between color and kinematics to simplify the construction of the complete four-loop four-point amplitude of N=4 super-Yang-Mills theory, including the nonplanar contributions. The duality completely determines the amplitude's integrand in terms of just two planar graphs. The existence of a manifestly dual gauge-theory amplitude trivializes the construction of the corresponding N=8 supergravity integrand, whose graph numerators are double copies (squares) of the N=4 super-Yang-Mills numerators. The success of this procedure provides further nontrivial evidence that the duality and double-copy properties hold at loop level. The new form of the four-loop four-point supergravity amplitude makes manifest the same ultraviolet power counting as the corresponding N=4 super-Yang-Mills amplitude. We determine the amplitude's ultraviolet pole in the critical dimension of D=11/2, the same dimension as for N=4 super-Yang-Mills theory. Strikingly, exactly the same combination of vacuum integrals (after simplification) describes the ultraviolet divergence of N=8 supergravity as the subleading-in-1/N_c^2 single-trace divergence in N=4 super-Yang-Mills theory., Comment: v2: PRD published version, fixed glitch in ancillary file. v1: 61 pages, 22 figures

Published
2012
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29. Four-Jet Production at the Large Hadron Collider at Next-to-Leading Order in QCD

Author

Bern, Z., Diana, G., Dixon, L. J., Cordero, F. Febres, Hoeche, S., Kosower, D. A., Ita, H., Maitre, D., and Ozeren, K.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

We present the cross sections for production of up to four jets at the Large Hadron Collider, at next-to-leading order in the QCD coupling. We use the BlackHat library in conjunction with SHERPA and a recently developed algorithm for assembling primitive amplitudes into color-dressed amplitudes. We adopt the cuts used by ATLAS in their study of multi-jet events in pp collisions at \sqrt{s} = 7 TeV. We include estimates of nonperturbative corrections and compare to ATLAS data. We store intermediate results in a framework that allows the inexpensive computation of additional results for different choices of scale or parton distributions., Comment: 5 pages, 2 figures, 2 tables. v2: references added, additional discussion of scale and PDF uncertainties, other minor clarifications

Published
2011
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30. N >= 4 Supergravity Amplitudes from Gauge Theory at Two Loops

Author

Boucher-Veronneau, C. and Dixon, L. J.

Subjects
High Energy Physics - Theory
Abstract

We present the full two-loop four-graviton amplitudes in N=4,5,6 supergravity. These results were obtained using the double-copy structure of gravity, which follows from the recently conjectured color-kinematics duality in gauge theory. The two-loop four-gluon scattering amplitudes in N=0,1,2 supersymmetric gauge theory are a second essential ingredient. The gravity amplitudes have the expected infrared behavior: the two-loop divergences are given in terms of the squares of the corresponding one-loop amplitudes. The finite remainders are presented in a compact form. The finite remainder for N=8 supergravity is also presented, in a form that utilizes a pure function with a very simple symbol., Comment: 31 pages, 2 figures, 1 table. v2: minor corrections, and references added

Published
2011
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31. Precise Predictions for Z + 4 Jets at Hadron Colliders

Author

Ita, H., Bern, Z., Dixon, L. J., Cordero, F. Febres, Kosower, D. A., and Maitre, D.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

We present the cross section for production of a Z boson in association with four jets at the Large Hadron Collider, at next-to-leading order in the QCD coupling. When the Z decays to neutrinos, this process is a key irreducible background to many searches for new physics. Its computation has been made feasible through the development of the on-shell approach to perturbative quantum field theory. We present the total cross section for pp collisions at sqrt{s} = 7 TeV, after folding in the decay of the Z boson, or virtual photon, to a charged-lepton pair. We also provide distributions of the transverse momenta of the four jets, and we compare cross sections and distributions to the corresponding ones for the production of a W boson with accompanying jets., Comment: 5 pages, 3 figures, 1 table, RevTex, corrected Z+0 jet cross section

Published
2011
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32. Driving Missing Data at Next-to-Leading Order

Author

Bern, Z., Diana, G., Dixon, L. J., Cordero, F. Febres, Hoeche, S., Ita, H., Kosower, D. A., Maitre, D., and Ozeren, K. J.

Subjects
High Energy Physics - Phenomenology
Abstract

The prediction of backgrounds to new physics signals in topologies with large missing transverse energy and jets is important to new physics searches at the LHC. Following a CMS study, we investigate theoretical issues in using measurements of gamma + 2-jet production to predict the irreducible background to searches for missing energy plus two jets that originates from Z + 2-jet production where the Z boson decays to neutrinos. We compute ratios of gamma + 2-jet to Z + 2-jet production cross sections and kinematic distributions at next-to-leading order in alpha_s, as well as using a parton shower matched to leading-order matrix elements. We find that the ratios obtained in the two approximations are quite similar, making gamma + 2-jet production a theoretically reliable estimator for the missing energy plus two jets background. We employ a Frixione-style photon isolation, but we also show that for isolated prompt photon production at high transverse momentum the difference between this criterion and the standard cone isolation used by CMS is small., Comment: 27 pages, 9 figures, 3 tables, RevTex, v2 minor corrections and added references

Published
2011
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33. Left-Handed W Bosons at the LHC

Author

Bern, Z., Diana, G., Dixon, L. J., Cordero, F. Febres, Forde, D., Gleisberg, T., Hoeche, S., Ita, H., Kosower, D. A., Maitre, D., and Ozeren, K.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

The production of W bosons in association with jets is an important background to new physics at the LHC. Events in which the W carries large transverse momentum and decays leptonically lead to large missing energy and are of particular importance. We show that the left-handed nature of the W coupling, combined with valence quark domination at a pp machine, leads to a large left-handed polarization for both W^+ and W^- bosons at large transverse momenta. The polarization fractions are very stable with respect to QCD corrections. The leptonic decay of the W bosons translates the common left-handed polarization into a strong asymmetry in transverse momentum distributions between positrons and electrons, and between neutrinos and anti-neutrinos (missing transverse energy). Such asymmetries may provide an effective experimental handle on separating W + jets from top quark production, which exhibits very little asymmetry due to C invariance, and from various types of new physics., Comment: 32 pages, revtex, 17 figures, 3 tables, v2 minor corrections to ME+PS results, no changes to conclusions, added references

Published
2011
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34. Precise Predictions for W + 4 Jet Production at the Large Hadron Collider

Author

Berger, C. F., Bern, Z., Dixon, L. J., Cordero, F. Febres, Forde, D., Gleisberg, T., Ita, H., Kosower, D. A., and Maitre, D.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

We present the first next-to-leading order QCD results for W + 4-jet production at hadron colliders. Total cross sections, as well as distributions in the jet transverse momenta and in the total transverse energy H_T are provided for the initial LHC energy of \sqrt{s} = 7 TeV. We use a leading-color approximation, known to be accurate to 3% for W production with fewer jets. The virtual matrix elements and the most complicated real-emission matrix elements are handled by the BlackHat library, based on on-shell methods. The remaining parts of the calculation, including the integration over phase space, are performed by the SHERPA package., Comment: 5 pages, 3 figures, 2 tables. v2: W^+ + 4 jets NLO results added, plus minor typo corrections

Published
2010
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35. The Complete Four-Loop Four-Point Amplitude in N=4 Super-Yang-Mills Theory

Author

Bern, Z., Carrasco, J. J. M., Dixon, L. J., Johansson, H., and Roiban, R.

Subjects
High Energy Physics - Theory
Abstract

We present the complete four-loop four-point amplitude in N=4 super-Yang-Mills theory, for a general gauge group and general D-dimensional covariant kinematics, and including all non-planar contributions. We use the method of maximal cuts --- an efficient application of the unitarity method --- to construct the result in terms of 50 four-loop integrals. We give graphical rules, valid in D-dimensions, for obtaining various non-planar contributions from previously-determined terms. We examine the ultraviolet behavior of the amplitude near D=11/2. The non-planar terms are as well-behaved in the ultraviolet as the planar terms. However, in the color decomposition of the three- and four-loop amplitude for an SU(N_c) gauge group, the coefficients of the double-trace terms are better behaved in the ultraviolet than are the single-trace terms. The results from this paper were an important step toward obtaining the corresponding amplitude in N=8 supergravity, which confirmed the existence of cancellations beyond those needed for ultraviolet finiteness at four loops in four dimensions. Evaluation of the loop integrals near D=4 would permit tests of recent conjectures and results concerning the infrared behavior of four-dimensional massless gauge theory., Comment: 108 pages, 37 figures

Published
2010
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36. Vector Boson + Jets with BlackHat and Sherpa

Author

Berger, C. F., Bern, Z., Dixon, L. J., Cordero, F. Febres, Forde, D., Gleisberg, T., Ita, H., Kosower, D. A., and Maitre, D.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

We review recent NLO QCD results for W,Z + 3-jet production at hadron colliders, computed using BlackHat and SHERPA. We also include some new results for Z + 3-jet production at the LHC at 7 TeV. We report new progress towards the NLO cross section for W + 4-jet production. In particular, we show that the virtual matrix elements produced by BlackHat are numerically stable. We also show that with an improved integrator and tree-level matrix elements from BlackHat, SHERPA produces well-behaved real-emission contributions. As an illustration, we present the real-emission contributions -- including dipole-subtraction terms -- to the p_T distribution of the fourth jet, for a single subprocess with the maximum number of gluons., Comment: 6 pages, 4 figures, presented at Loops and Legs 2010

Published
2010
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37. Next-to-Leading Order QCD Predictions for Z,gamma^*+3-Jet Distributions at the Tevatron

Author

Berger, C. F., Bern, Z., Dixon, L. J., Cordero, F. Febres, Forde, D., Gleisberg, T., Ita, H., Kosower, D. A., and Maitre, D.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

Using BlackHat in conjunction with SHERPA, we have computed next-to-leading order QCD predictions for a variety of distributions in Z,gamma*+1,2,3-jet production at the Tevatron, where the Z boson or off-shell photon decays into an electron-positron pair. We find good agreement between the NLO results for jet p_T distributions and measurements by CDF and D0. We also present jet-production ratios, or probabilities of finding one additional jet. As a function of vector-boson p_T, the ratios have distinctive features which we describe in terms of a simple model capturing leading logarithms and phase-space and parton-distribution-function suppression., Comment: 50 pages, RevTeX, 17 figures, v2 clarifications including commentary on threshold and other logarithms

Published
2010
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38. The Bilingual Education Policy in Singapore: Implications for Second Language Acquisition.

Author

Dixon, L. Quentin

Abstract

This paper examines assumptions about second language acquisition, bilingualism, and language planning that underlie Singapore's bilingual education policy, noting how the experience in Singapore illuminates current theories in second language acquisition and language planning. In Singapore, English is promoted as the "working language," while Mandarin, Chinese, Malay, and Tamil are considered mother tongues of the major ethnic groups. In the late 1970s, the government adopted a bilingual education policy which requires that all students study their subject matter curriculum in English and all students achieve proficiency in their mother tongue. Singapore's national exams usually show upward trends for all ethnic groups, though there is an achievement gap between the Chinese majority and the Malay and Indian minority groups. Although Chinese students consistently outperform the other groups, and a greater proportion move on to higher education, each ethnic group shows strengths in different areas. Singapore's language policy reflects many common assumptions about language learning (e.g., beginning a second language early leads to higher proficiency). It also reflects many assumptions concerning language planning (e.g., language is a tool that should be carefully chosen for its utility to the national interest). (Contains 38 references.) (SM)

Published
2003

39. Next-to-Leading Order Jet Physics with BlackHat

Author

Berger, C. F., Bern, Z., Dixon, L. J., Cordero, F. Febres, Forde, D., Gleisberg, T., Ita, H., Kosower, D. A., and Maitre, D.

Subjects
High Energy Physics - Phenomenology
Abstract

We present several results obtained using the BlackHat next-to-leading order QCD program library, in conjunction with SHERPA. In particular, we present distributions for vector boson plus 1,2,3-jet production at the Tevatron and at the asymptotic running energy of the Large Hadron Collider, including new Z+3-jet distributions. The Z+2-jet predictions for the second-jet P_T distribution are compared to CDF data. We present the jet-emission probability at NLO in W+2-jet events at the LHC, where the tagging jets are taken to be the ones furthest apart in pseudorapidity. We analyze further the large left-handed W polarization, identified in our previous study, for W bosons produced at high P_T at the LHC., Comment: Presented at RADCOR 2009 - 9th International Symposium on Radiative Corrections (Applications of Quantum Field Theory to Phenomenology), October 25 - 30 2009, Ascona, Switzerland}, 12 pages, 9 figures, LaTeX, v2 updated small correction to polarization effect plot

Published
2009

40. R^4 counterterm and E7(7) symmetry in maximal supergravity

Author

Broedel, J. and Dixon, L. J.

Subjects
High Energy Physics - Theory
Abstract

The coefficient of a potential R^4 counterterm in N=8 supergravity has been shown previously to vanish in an explicit three-loop calculation. The R^4 term respects N=8 supersymmetry; hence this result poses the question of whether another symmetry could be responsible for the cancellation of the three-loop divergence. In this article we investigate possible restrictions from the coset symmetry E7(7)/SU(8), exploring the limits as a single scalar becomes soft, as well as a double-soft scalar limit relation derived recently by Arkani-Hamed et al. We implement these relations for the matrix elements of the R^4 term that occurs in the low-energy expansion of closed-string tree-level amplitudes. We find that the matrix elements of R^4 that we investigated all obey the double-soft scalar limit relation, including certain non-maximally-helicity-violating six-point amplitudes. However, the single-soft limit does not vanish for this latter set of amplitudes, which suggests that the E7(7) symmetry is broken by the R^4 term., Comment: 33 pages, typos corrected, published version

Published
2009
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41. NLO QCD Predictions for W+3 jets

Author

Berger, C. F., Bern, Z., Dixon, L. J., Cordero, F. Febres, Forde, D., Gleisberg, T., Ita, H., Kosower, D. A., and Maitre, D.

Subjects
High Energy Physics - Phenomenology
Abstract

In this contribution we present results from the NLO computation of the production of a $W$ boson in association with three jets in hadronic collisions. The results are obtained by combining two programs: {\tt BlackHat} for the virtual one-loop matrix elements and {\tt Sherpa} for the real-emission contributions. We present results for the Tevatron and the LHC, and address the issue of the choice of a common factorization and renormalization scale for this process., Comment: Invited talk given at the European Physical Society Europhysics Conference on High Energy Physics, EPS-HEP 2009, July 16 - 22 2009, Krakow, Poland

Published
2009

42. Next-to-Leading Order QCD Predictions for W+3-Jet Distributions at Hadron Colliders

Author

Berger, C. F., Bern, Z., Dixon, L. J., Cordero, F. Febres, Forde, D., Gleisberg, T., Ita, H., Kosower, D. A., and Maitre, D.

Subjects
High Energy Physics - Phenomenology
Abstract

We present next-to-leading order QCD predictions for a variety of distributions in W+3-jet production at both the Tevatron and the Large Hadron Collider. We include all subprocesses and incorporate the decay of the W boson into leptons. Our results are in excellent agreement with existing Tevatron data and provide the first quantitatively precise next-to-leading order predictions for the LHC. We include all terms in an expansion in the number of colors, confirming that the specific leading-color approximation used in our previous study is accurate to within three percent. The dependence of the cross section on renormalization and factorization scales is reduced significantly with respect to a leading-order calculation. We study different dynamical scale choices, and find that the total transverse energy is significantly better than choices used in previous phenomenological studies. We compute the one-loop matrix elements using on-shell methods, as numerically implemented in the BlackHat code. The remaining parts of the calculation, including generation of the real-emission contributions and integration over phase space, are handled by the SHERPA package., Comment: 64 pages, 37 figures, v2 minor changes in table X, cross sections and distributions unaffected; other minor corrections to text, references added

Published
2009
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43. Multi-jet cross sections at NLO with BlackHat and Sherpa

Author

Berger, C. F., Bern, Z., Dixon, L. J., Cordero, F. Febres, Forde, D., Gleisberg, T., Ita, H., Kosower, D. A., and Maitre, D.

Subjects
High Energy Physics - Phenomenology
Abstract

In this talk, we report on a recent next-to-leading order QCD calculation of the production of a W boson in association with three jets at hadron colliders. The computation is performed by combining two programs, BlackHat for the computation of the virtual one-loop matrix elements and Sherpa for the real emission part., Comment: 4 pages, contribution to the proceedings of the XLIIIth Rencontres de Moriond (QCD)

Published
2009

44. The Ultraviolet Behavior of N=8 Supergravity at Four Loops

Author

Bern, Z., Carrasco, J. J., Dixon, L. J., Johansson, H., and Roiban, R.

Subjects
High Energy Physics - Theory
Abstract

We describe the construction of the complete four-loop four-particle amplitude of N=8 supergravity. The amplitude is ultraviolet finite, not only in four dimensions, but in five dimensions as well. The observed extra cancellations provide additional non-trivial evidence that N=8 supergravity in four dimensions may be ultraviolet finite to all orders of perturbation theory., Comment: 5 pages, 4 figures. v2 contains minor corrections, including flipping sign of eq. (1). Complete results, including mathematica readable form, presented in the directory aux/ included in the source of this manuscript. As certain computer operating systems (e.g. Windows) preclude the naming of directories "aux" we also host this data at: http://www.physics.ucla.edu/~jjmc/auxiliaryData.tgz

Published
2009
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45. Safety and efficacy of intraperitoneal drain placement after emergency colorectal surgery: An international, prospective cohort study

Author

Sgro, A, Blanco-Colino, R, Ahmed, W, Brindl, N, Gujjuri, R, Lapolla, P, Mills, E, Perez-Ajates, S, Soares, A, Varghese, C, Xu, W, Mclean, K, Chapman, S, Espin-Basany, E, Glasbey, J, Mihaljevic, A, Nepogodiev, D, Pata, F, Pellino, G, Pockney, P, Dudi-Venkata, N, Egoroff, N, Ludbrook, I, Raubenheimer, K, Richards, T, Delibegovic, S, Salibasic, M, Amjad, T, Dorr-Harim, C, Gedeon, N, Gsenger, J, Tachezy, M, Bini, S, Gallo, G, Gori, A, Picciariello, A, Podda, M, Riboni, C, Machatschek, M, Nguyen, A, Jakubauskas, M, Kryzauskas, M, Poskus, T, Kuiper, S, Wang, J, Wells, C, Bissett, I, Augestad, K, Steinholt, I, Vieira, B, Juloski, J, Anabitarte Bautista, O, Kasmy El Kasmy, Y, Martin-Borregon, P, Ossola Revilla, M, Van Straten, S, Aktas, M, Baki, B, Akhbari, M, Baker, D, Bhatia, S, Brown, S, Cambridge, W, Kamarajah, S, Khaw, R, Kouli, O, Murray, V, Trout, I, Yasin, I, Wong, J, Reyhani, H, Wong, K, Pancharatnam, R, Chia, W, Walmsley, A, Hassane, A, Saeed, D, Wang, B, Walters, B, Nowinka, Z, Alsaif, A, Mirza, M, Foster, K, Luu, J, Kakodkar, P, Hughes, J, Yogarajah, T, Antypas, A, Rahman, A, Bradbury, M, Mclarnon, M, Nagi, S, Riad, A, Erotocritou, M, Kyriacou, H, Kaminskaite, V, Alfadhel, S, Fatimah Hussain, Q, Handa, A, Massy-Westropp, C, Custovic, S, Dimov, R, Mughal, H, Slavchev, M, Ivanov, T, Gouvas, N, Hegazi, A, Kocian, P, Kjaer, M, Mark-Christensen, A, Papakonstantinou, D, Machairas, N, Triantafyllou, T, Garoufalia, Z, Korkolis, D, Castaldi, A, Giaccari, S, Spolverato, G, Pagano, G, Milone, M, Turri, G, Colombo, F, Cucinotta, E, Poillucci, G, Perra, T, Tutino, R, Belia, F, Coletta, D, Belli, A, Rega, D, Cianci, P, Pirozzolo, G, Di Lena, M, Perrone, F, Giani, A, Lovisetto, F, Grassia, M, Pipitone Federico, N, Ferrara, F, Biancafarina, A, Tamini, N, Sinibaldi, G, Tuminello, F, Galleano, R, Sasia, D, Bragaglia, L, de Manzoni Garberini, A, Pesce, A, Cassaro, F, Venturelli, P, Canu, G, Esposito, G, Campanelli, M, Cardia, R, Ricciardiello, M, Sagnotta, A, Canonico, G, De Marco, G, Cappiello, A, Pinotti, E, Carlei, F, Lisi, G, Bagaglini, G, Farrugia, M, Meima - van Praag, E, Monteiro, C, Pereira, M, Botelho, P, Quigley, A, O'Neill, A, Gaule, L, Crone, L, Arnold, A, Grama, F, Beuca, A, Tulina, I, Litvin, A, Panyko, A, Ossola, M, Trujillo Diaz, J, Marin Santos, J, Alonso Batanero, E, Gortazar de las Casas, S, Soldevila Verdeguer, C, Colas-Ruiz, E, Talal El-Abur, I, Garcia Dominguez, M, Delorme, M, Sauvain, M, Ozmen, B, Ozkan, B, Calikoglu, F, Kural, S, Zafer, F, Kaya, Y, Yalcinkaya, A, Kargici, K, Tepe, M, Tatar, O, Kabadayi, E, Yildirim, A, Hurmuzlu, D, Korkmaz, K, Sharma, P, Troller, R, Hagan, N, Mooney, J, Light, A, Tansey, M, Bhojwani, D, Mcging, R, Mallon, A, Fadel, M, Spilsbury, C, James, R, O'Brien, S, Isaac, A, Balasubramanya, S, Sadik, H, Gala, T, Chen, J, Turner, B, Goh, E, Hassan, K, Karam, M, Mason, P, Tzoumas, N, Noton, T, Seehra, J, Ahmed, N, Motiwale, R, Tanna, V, Argyriou, A, Bylapudi, S, Grace, N, Latif, S, Hounat, A, Kiam, J, Zaidi, M, Elsamani, K, Hughes, C, Suresh, A, Sinan, L, El-Dalil, D, Khoo, E, Salim, E, Stark, D, Minhas, N, Fowler, G, Rees, E, Giudiceandrea, I, Bardon, A, Jayawardena, P, Dieseru, N, Murphy, A, Yates, C, Ziolkowska, K, Rafie, A, Khoda, F, Okocha, M, Ashdown, T, Vitish-Sharma, P, Gilliland, J, Toh, S, Jones, K, Devine, A, Berry, A, Mcdonnell, S, Olivier, J, Richardson, G, Lim, H, Slim, N, Elsayeh, K, Sammour, T, Sarpanov, A, Belev, N, Dimitrov, D, Dusek, T, Ntomi, V, Sotiropoulos, G, Theodorou, D, Nikiteas, N, Balalis, D, Antropoli, C, Altomare, D, Luglio, G, De Palma, G, Pedrazzani, C, Simonelli, L, Brozzetti, S, Porcu, A, Massani, M, Grazi, G, Izzo, F, Delrio, P, Restini, E, Chetta, G, Lantone, G, Ferrari, G, Lucchi, A, De Prizio, M, Caristo, G, Borghi, F, Petrucciani, N, Huscher, C, Cocorullo, G, Tonini, V, Medas, F, Sica, G, Cillara, N, Anastasi, A, Bianco, F, Giuliani, A, Carlini, M, Selvaggi, F, Sammarco, G, Ozolins, A, Malasonoks, A, Andrejevic, P, Tanis, P, van de Ven, A, Gerhards, M, Ribeiro da Silva, B, Silva, A, Lima, M, Kavanagh, D, Mccawley, N, Bintintan, V, Karamarkovic, A, Sanz Ortega, G, De Andres-Asenjo, B, Nevado Garcia, C, Garcia Florez, L, Segura-Sampedro, J, Blas Laina, J, Ponchietti, L, Buchwald, P, Gialamas, E, Ozben, V, Rencuzogullari, A, Gecim, I, Altinel, Y, Isik, O, Yoldas, T, Isik, A, Leventoglu, S, Erturk, M, Guner, A, Guler, S, Attaallah, W, Ugur, M, Ozbalci, G, Marzook, H, Eardley, N, Smolarek, S, Morgan, R, Roxburgh, C, Lala, A, Salama, Y, Singh, B, Khanna, A, Evans, M, Shaikh, I, Maradi Thippeswamy, K, Appleton, B, Moug, S, Smith, I, Smart, N, Shah, P, Williams, G, Khera, G, Goede, A, Varcada, M, Parmar, C, Duff, S, Hargest, R, Marriott, P, Speake, D, Ben Sassi, A, Furfaro, B, Daudu, D, Golijanin, N, Yek, W, Capasso, G, Mansour, L, Niu, N, Seow, W, Hamidovic, A, Kulovic, E, Letic, E, Aljic, A, Helez, M, Banji-Kelan, A, Dimitrova, N, Kavradjieva, P, Ivanov, V, Jukaku, A, Hadzhiev, D, Gabarski, A, Karamanliev, M, Vladova, P, Iliev, S, Yotsov, T, Epsilonupsilonsigmataualphathetaiotaomicronupsilon, E, Vetsa, K, Stavrinidou, O, Papatheodorou, P, Liassides, T, Georgiou, T, Al Nassrallah, M, Altaf, R, Negametzyanov, M, Zagibova, D, Foltys, F, Stefanova, H, Paspala, A, Bompetsi, G, Sidiropoulos, T, Stamopoulos, P, Triantafyllou, A, Theodoropoulos, C, Kimpizi, A, Palyvou, T, Charalabopoulos, A, Syllaios, A, Schizas, D, Liatsou, E, Baili, E, Vagios, I, Tomara, N, Davakis, S, Palumbo, A, Foroni, F, Dibra, R, Papagni, V, Urbani, A, Rossin, E, Nezi, G, Romano, P, Amendola, A, Esposito, E, Manigrasso, M, Anoldo, P, Vertaldi, S, Gecchele, G, Sabrina, Z, Guerci, C, Cammarata, F, Lamperti, G, Zaffaroni, G, Benuzzi, L, Ferrario, L, Cigognini, M, Mazzeo, C, Badessi, G, Pintabona, G, Fassari, A, Mingoli, A, Cirillo, B, D'Alterio, C, Brachini, G, Tancredi, M, Zambon, M, Aulicino, M, Sapienza, P, Liberatore, P, Scanu, A, Feo, C, Iacomino, A, Pelizzo, P, Rossi, S, Vigna, S, Grossi, U, Grillo, V, Agnes, A, Schena, C, Marincola, G, Oddi, A, Perotti, B, Mario, V, Perri, P, Zazza, S, Aversano, A, Scala, D, Di Lauro, K, Leongito, M, Piccirillo, M, Patrone, R, Capuzzolo, S, Vignotto, C, Bao, Q, Giuseppe, C, Angarano, E, Marino, F, Pezzolla, F, Gigante, G, Magistro, C, Crippa, J, Maspero, M, Carnevali, P, Trapani, R, Zonta, S, Agostinelli, L, Vittori, L, Romeo, L, Doria, E, Farnesi, F, Danna, R, Andolfi, E, Pellicano', G, Angelini, M, Scricciolo, M, Zanframundo, C, Ciulli, C, Ripamonti, L, Cigagna, L, Oldani, M, Larcinese, A, Rossi, D, Picone, E, Crescentini, G, Marano, A, Migliore, M, Giuffrida, M, Palagi, S, Testa, V, Borrello, A, Lucarini, A, Garofalo, E, Canali, G, Orlandi, P, Nervegna, F, Marchegiani, F, Damoli, I, Licata, A, Trovato, C, Alicata, F, Sardo, F, Milazzo, M, Randisi, B, Dominici, D, Sartarelli, L, Zanni, M, Pisanu, A, Soddu, C, Delogu, D, Erdas, E, Campus, F, Cappellacci, F, Casti, F, Marcialis, J, Atzeni, J, Sensi, B, Franceschilli, M, Bellato, V, Cannavera, A, Putzu, G, di Mola, F, Picardi, B, Solinas, L, Loponte, M, Rossi del Monte, S, Di Martino, C, Linari, C, Spagni, G, Capezzuoli, L, Tirloni, L, Nelli, T, Caridi, A, Elter, C, Camassa, M, D'Amico, S, Bargellini, T, Incollingo, P, Montuori, M, Maffione, F, Romano, L, Valiyeva, S, Spoletini, D, Menegon Tasselli, F, Sciaudone, G, Selvaggi, L, Menna, M, De Paola, G, Fulginiti, S, Truskovs, A, Weiss, C, Saknitis, G, Rauscher, J, Larnovskis, J, Jeyarajan-Davidsson, M, Nitisa, D, Gille, N, Reiser, S, Roshan, M, Leseman, C, van Dalen, A, Top, C, Detering, R, Matos, C, Silva, C, Pinto, D, Mendes, J, Couto, J, Leite, M, Velez, C, Damasio Cotovio, M, Cinza, A, Pedroso de Lima, R, Boyle, E, Yang, H, Banerjee, I, Rahmat, S, Afzal, Z, Reid, C, Dumitrascu, F, Croyle, J, Gressmann, K, Cullen, N, Graham, A, Nasehi, A, Montano King, C, Martin, B, Stokell, C, Sanderson, N, Farnan, R, Jassim, S, Chan, B, Chua Vi Long, K, Kaka, N, Pandey, S, Neo, W, Chitul, A, Bezede, C, Cincilei, D, David, A, Blaga, M, Blaga, S, Fagarasan, V, Khetagurova, M, Rodimov, S, Kapustina, A, Mekhralyzade, A, Zabiyaka, M, Jankovic, U, Cuk, V, Hajska, M, Dubovsky, M, Hrosova, M, Ferancikova, N, Camarero Rodriguez, E, Laguna Alcantara, F, Adarraga, J, Jezieniecki, C, Ruiz Soriano, M, Gomez Sanz, T, Suarez, A, Sanchez Garcia, C, Cifrian Canales, I, Llosa Perez, J, Merayo, M, Urbieta, A, Gegundez Simon, A, Tone, J, Gazo Martinez, J, Vicario Bravo, M, Chavarrias, N, Gil Catalan, A, Oseira, A, Villalonga, B, Jeri, S, Perez Calvo, J, Nogues, A, Cros, B, Yanez, C, Utrilla Fornals, A, Roldon Golet, M, Colsa, P, Gimenez Maurel, T, Axmarker, T, Chevallay, M, Pham, T, Sel, E, Atar, C, Aba, M, Sarkin, M, Akkaya, Y, Durmaz, A, Gullu, H, Boga, A, Aktas, A, Bakar, B, Demirel, M, Hysejni, X, Taser, M, Guzel, O, Bozbiyik, O, Ozen, D, Olmez, M, Uyar, B, Gulcek, E, Kayacan, G, Atici, N, Gul, O, Altiner, S, Ibis, B, Altunsu, S, Banaz, T, Diler, C, Demirbas, I, Usta, M, Erkul, O, Orman, R, Salih, S, Utkan, N, Acil, C, Ozgur, E, Maddahali, M, Turhan, A, Eskici, A, Ular, B, Dogru, M, Ozturk, O, Arslan, E, Panahi Sharif, A, Dikmen, E, Ates, J, Bircan, R, Cavus, T, Sever, A, Balak, B, Duman, E, Altay, L, Emanet, O, Cullen, F, Tan, J, Nathan, A, Rottenberg, A, Williams, C, Mitrofan, C, Xu, D, Bawa, J, Morris, P, Gordon, D, Richmond, G, Hui, J, Ighomereho, O, Rocks, R, Mccabe, S, Fitzpatrick, A, Nicoletti, J, Auterson, L, Darrah, N, Soh, V, Ong, C, Utukuri, M, Gallagher, C, Stuart, L, Hipolito, M, Douglas, N, Ghazal, R, Parris, G, Catchpole, J, Bryden, M, Jamal, S, Karim, Z, Lyon-Dean, C, Rowley, G, Lee, K, Whitehurst, O, Mirza, A, Sheikh, F, Yousaf, H, Bilbao, J, Sinclair, R, Takar, S, Kressel, H, Chan, V, Schack, K, Osborne, R, Baldemor, S, Smyth, S, Gilmour, S, Ting, A, Bozonelou, I, Saunders, P, Qhaireel Anwar, Q, Tirimanna, R, Jauhari, S, Gardener, A, Walker, B, Wenban, C, Reddy, H, Conway-Jones, R, Loganathan, S, Clynch, A, James, C, Matey, E, Cameron, F, Roberts, W, Gicquel, A, Milliken, C, Forbes, J, Rubinchik, P, Azmi, A, Hawkes, C, Cornett, L, Adarkwah, P, Mcconville, R, O'Hara, S, Tijare, C, Parkes, J, Yao, L, Ahmad, R, Shafiq, U, Mhaisalkar, A, Gurung, A, de Stadler, K, Elias, S, Thomas, T, Madras, A, Jani, A, Daler, H, Tong, K, Sundaralingam, S, Szal, A, Khan, A, O'Sullivan, C, Baker, E, Joseph-Gubral, J, Hadley, E, Trivedi, R, Igwelaezoh, E, Barton, H, Allison, W, Hurst, W, Alam, F, Parkes, I, Jamshaid, M, Azizan, N, Burgher, T, Afzal, A, Eltilib, I, Zahid, M, Sadiq, O, Lloyd, A, Ho, R, Brazukas, A, Li, C, Kamdar, M, Mohamed Nazeer, M, Mighiu, A, Kim, D, Wilkins, L, Kuo, L, Rafe, T, Maduka, D, Cheema, H, Farag, K, Abdellatif, M, Nzewi, R, Kruczynska, A, Grasselli, H, Yousuff, M, Bassi, R, Mann, A, Chopra, J, Shaikh, M, D Sa, S, Tsimplis, V, Ghanchi, A, Skene, E, Asim, K, Zaheer, M, Chan, S, Dalton, H, Gibbons, K, Adderley, O, Chukwujindu, I, Jayasuriya, I, Sivanu, K, Borumand, M, Chick, G, Bridges, I, Tomlin, J, Mckenna, J, Nandra, N, Grieco, C, Quek, F, Mercer, R, Brankin-Frisby, T, Sattar, A, Aslam, A, Edelsten, E, Shafi, S, Kouli, T, Ford, V, Gurung, F, Fernandes, M, Deader, N, Ponniah, R, Jamieson, S, Davies, A, Taubwurcel, J, Aung, M, Desai, R, Begum, S, Jamadar, T, Kangatharan, A, Rzeszowski, B, Ho, C, Yap, S, Prendergast, M, Sethi, R, Duku, A, Lowe, C, Bray, J, Ghobrial, M, Nichita, V, Wagstaff, A, Rengasamy, E, Abu Hassan, F, Mahmood, H, Savill, N, Shah, S, Almeida, T, Edwards, A, Catchpole, B, Halford, Z, Carmichael, A, Alsusa, H, Boyd, M, Williams, J, Feyi-Waboso, J, Patel, M, Zeidan, Z, Bailey, E, Bapty, J, Brazkiewicz, M, Tremlett, A, Pringle, H, Mankal, S, Chung, W, Parry-Jones, E, Anderson, K, Mcforrester, A, Stanley, A, Hoather, A, Wise, H, Laid, I, Scriven, J, Braniste, A, Wilson, A, Le Blevec, L, Pakunwanich, N, Evans, N, Chong, H, White, C, Hunter, J, Haque, M, Vanalia, P, Murdoch, S, Choudhary, T, Mccann, A, Harun, A, Shah, H, Hunt, S, Shafiq, Y, Bickley-Morris, E, Emms, L, Dare, M, Akula, Y, Deliyannis, E, Mayes, F, Ellacott, M, Zagorac, Z, Farren, A, Manning, C, Hughed, C, Stewart, E, Lim, K, Chohan, N, Thaker, A, Thompson, B, Ahari, D, Burdekin, E, Okwu, U, Akintunde, A, Lhaf, F, Douthwaite, J, Govindan, R, Leelamanthep, S, Gull, E, Wright, F, Dundas, L, Mackdermott, N, Burchi-Khairy, T, Campbell, I, Walsh, J, Yeo, J, Meehan, S, Banerjee, D, Fu, M, Kawka, M, Ali, T, Hussain, Z, Thomas, C, Ahmad, H, Moroney, J, Yick, C, Risquet, R, Ntuiabane, D, Shimato, M, Khan, M, Ilangovan, S, Vaselli, N, Smithers, R, Uhanowita Marage, R, Valnarov-Boulter, A, Kayran, J, Banerjee, M, Parekh-Hill, N, Hooper, A, Bowen, J, Jagdish, R, Mcquoid, C, Khan, N, O Hare, R, Jeffery, S, Zahid, A, Elsworth, C, Walter, L, Dhillon, S, Rao, S, Anthony, A, Ashaye, A, Phillips, N, Faderani, R, Pengelly, S, Choi, S, Kwak, S, Lau, Y, Bagheri, K, Ong, D, Kerr, E, Falconer, K, Clancy, N, Douglas, S, Zhang, Y, Greenfield, F, Mutanga, I, Mcalinden, J, Willis, L, Adefolaju, A, Agarwal, H, Barter, R, Harris, G, Spencer, G, Lee, M, V Vadiveloo, T, Herbert, G, Patel, R, Shah, M, El Falaha, S, Wong, C, Soare, C, Akram, J, Bozhkova, L, Ma, Y, Vo, U, Tan, H, Leto, L, Kamal, M, Hadzhieva, E, Krastev, P, Tonchev, P, Kokkinos, G, Pozotou, I, Sabbagh, D, Votava, J, St, F, Koliakos, N, Tsaparas, P, Zografos, G, Mantas, D, Tsourouflis, G, Fradelos, E, Trigiante, G, Labellarte, G, Resta, G, Capelli, G, D'Amore, A, Verlingieri, V, Campagnaro, T, Maffioli, A, Viscosi, F, De Lucia, C, Meneghini, S, Fancellu, A, Colella, M, Biondi, A, De Peppo, V, Pace, U, Albino, V, Gattulli, D, Piangerelli, A, Kalivaci, D, Sisto, G, Mazzola, M, Caneparo, A, Lunghi, E, Nespoli, L, Angrisani, M, Langone, A, Gelarda, E, Virgilio, E, Angelini, E, Fornasier, C, Asero, S, Filippone, E, Frongia, F, Calo, P, Panaccio, P, Ipponi, P, Gili, S, Braccio, B, Tiesi, V, Stolcers, K, Kokaine, L, Novikovs, V, Capel, L, Bastiaenen, V, Heijmans, H, Henriques, S, Gan, S, Ramanayake, H, Nolan, M, Temperley, H, Ciofic, E, Pop, B, Kurtenkov, M, Jovanovic, M, Vician, M, Egea Arias, P, Beltran de Heredia, J, Labalde Martinez, M, De Santiago Alvarez, I, Alvarez-Gallego, M, Rodriguez Artigas, J, Dwidar, O, Korkmaz, H, Eray, I, Meric, S, Aydin, R, Cetin, B, Karaca, B, Kuyumcu, O, Yuksel, E, Uprak, T, Karabulut, K, Kavukcu, E, Mansor, A, Hackett, R, Zammit-Maempel, M, Sabaratnam, R, Maan, A, Ferarrio, I, Dixon, L, Halai, H, Sethi, S, Nelson, L, Grassam-rowe, A, Krishnan, E, Deeny, D, Mckeever, M, George Pandeth, A, Dhavala, P, Sreenivasan, S, Sundaram Venkatesan, G, Zhu, L, Atiyah, Z, Gregory, J, Morey, T, Seymour, Z, Holdsworth, L, Abdelmahmoud, S, Bourhill, J, Bisheet, G, Shaw, J, Kulkarni, K, Kumarakulasingam, P, Pillay, S, Al-Habsi, R, Kungwengwe, G, Richards, J, Davoudi, K, Ibrahim, B, Tailor, B, Zayed, M, Chen, F, Bailey, S, Sheefat, S, Nawaz, G, Pawar, R, Marsh, S, Sam, Z, Roy Bentley, S, Simpson, C, Lim, Y, Ooi, R, Toh, W, Mannion, P, Lovett, A, Kincius, A, Hussein, S, Kirby, E, Beckett, R, Salmon, J, Glynn, T, Choo, S, Lyons, S, Browne, D, Ravindran, W, Ahmad, S, Zhu, X, Mcnulty, J, Mccarthy, L, Ng, J, Karmally, Z, Mcteir, K, Hanna, M, Tan, E, Namdeo, S, Schembri, R, Pusey, E, Sgro A., Blanco-Colino R., Ahmed W. U. R., Brindl N., Gujjuri R. R., Lapolla P., Mills E. C., Perez-Ajates S., Soares A. S., Varghese C., Xu W., McLean K. A., Chapman S. J., Espin-Basany E., Glasbey J. C., Mihaljevic A., Nepogodiev D., Pata F., Pellino G., Pockney P., Dudi-Venkata N. N., Egoroff N., Ludbrook I., Raubenheimer K., Richards T., Delibegovic S., Salibasic M., Amjad T., Dorr-Harim C., Gedeon N., Gsenger J., Tachezy M., Bini S., Gallo G., Gori A., Picciariello A., Podda M., Riboni C., Machatschek M. J., Nguyen A., Jakubauskas M., Kryzauskas M., Poskus T., Kuiper S. Z., Wang J., Wells C. I., Bissett I. P., Augestad K. M., Steinholt I., Vieira B. N., Juloski J., Anabitarte Bautista O., Kasmy El Kasmy Y., Martin-Borregon P., Ossola Revilla M., Van Straten S., Aktas M. K., Baki B. E., Akhbari M., Baker D., Bhatia S., Brown S., Cambridge W., Kamarajah S. K., Khaw R. A., Kouli O., Murray V., Trout I., Yasin I., Wong J. Y., Reyhani H., Wong K. H. F., Pancharatnam R., Chia W. L., Walmsley A., Hassane A., Saeed D., Wang B., Walters B., Nowinka Z., Alsaif A., Mirza M., Foster K., Luu J., Kakodkar P., Hughes J. T., Yogarajah T., Antypas A., Rahman A., Bradbury M., McLarnon M., Nagi S., Riad A. M., Erotocritou M., Kyriacou H., Kaminskaite V., Alfadhel S., Fatimah Hussain Q., Handa A., Massy-Westropp C., Custovic S., Dimov R., Mughal H., Slavchev M., Ivanov T., Gouvas N., Hegazi A., Kocian P., Kjaer M. D., Mark-Christensen A., Papakonstantinou D., Machairas N., Triantafyllou T., Garoufalia Z., Korkolis D., Castaldi A., Giaccari S., Spolverato G., Pagano G., Milone M., Turri G., Colombo F., Cucinotta E., Poillucci G., Perra T., Tutino R., Belia F., Coletta D., Belli A., Rega D., Cianci P., Pirozzolo G., Di Lena M., Perrone F., Giani A., Lovisetto F., Grassia M., Pipitone Federico N. S., Ferrara F., Biancafarina A., Tamini N., Sinibaldi G., Tuminello F., Galleano R., Sasia D., Bragaglia L., de Manzoni Garberini A., Pesce A., Cassaro F., Venturelli P., Canu G. 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T., Desai R., Begum S., Jamadar T., Kangatharan A., Rzeszowski B., Ho C., Yap S. H. K., Prendergast M., Sethi R., Duku A., Lowe C., Bray J., Ghobrial M., Nichita V., Wagstaff A., Rengasamy E., Abu Hassan F., Mahmood H., Savill N., Shah S., Almeida T., Edwards A., Catchpole B., Halford Z., Carmichael A., Alsusa H., Boyd M., Williams J., Feyi-Waboso J., Patel M., Zeidan Z., Bailey E., Bapty J., Brazkiewicz M., Tremlett A., Pringle H., Mankal S., Chung W., Parry-Jones E., Anderson K., Mcforrester A., Stanley A., Hoather A., Wise H., Laid I., Scriven J., Braniste A., Wilson A., Le Blevec L., Pakunwanich N., Evans N., Chong H. L., White C., Hunter J., Haque M., Vanalia P., Murdoch S., Choudhary T., McCann A., Harun A., Shah H., Hunt S., Shafiq Y., Bickley-Morris E., Emms L., Dare M., Akula Y., Deliyannis E., Mayes F., Ellacott M., Zagorac Z., Farren A., Manning C., Hughed C., Stewart E. G., Lim K. 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F., Gazo Martinez J., Vicario Bravo M., Chavarrias N., Gil Catalan A., Oseira A., Villalonga B., Jeri S., Perez Calvo J., Nogues A., Cros B., Yanez C., Utrilla Fornals A., Roldon Golet M., Colsa P., Gimenez Maurel T., Axmarker T., Chevallay M., Pham T. V., Sel E. K., Atar C., Aba M., Sarkin M., Akkaya Y. M., Durmaz A. G., Gullu H. F., Boga A., Aktas A., Bakar B., Demirel M. T., Hysejni X., Taser M., Guzel O. R., Bozbiyik O., Ozen D., Olmez M., Uyar B., Gulcek E., Kayacan G. S., Atici N., Gul O. F., Altiner S., Ibis B., Altunsu S., Banaz T., Diler C., Demirbas I., Usta M. A., Erkul O., Orman R., Salih S., Utkan N. Z., Acil C., Ozgur E., Maddahali M., Turhan A. B., Eskici A. B., Ular B., Dogru M., Ozturk O. U., Arslan E. R., Panahi Sharif A., Dikmen E., Ates J., Bircan R., Cavus T., Sever A. E., Balak B., Duman E., Altay L., Emanet O., Cullen F., Tan J. Y., Nathan A., Rottenberg A., Williams C. Y., Mitrofan C. G., Xu D., Bawa J. H., Morris P., Gordon D., Richmond G., Hui J. 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S., Szal A., Khan A., O'Sullivan C., Baker E., Joseph-Gubral J., Hadley E., Trivedi R., Igwelaezoh E., Barton H., Allison W., Hurst W., Alam F., Parkes I., Jamshaid M., Azizan N., Burgher T., Afzal A., Eltilib I., Zahid M., Sadiq O., Lloyd A., Ho R., Brazukas A., Li C. H., Kamdar M., Mohamed Nazeer M. N., Mighiu A., Kim D., Wilkins L., Kuo L., Rafe T., Maduka D., Cheema H., Farag K., Abdellatif M., Nzewi R., Kruczynska A., Grasselli H., Yousuff M., Bassi R., Mann A. K., Chopra J., Shaikh M., D Sa S., Tsimplis V., Ghanchi A., Skene E., Asim K., Zaheer M., Chan S., Dalton H., Gibbons K., Adderley O., Chukwujindu I., Jayasuriya I., Sivanu K., Borumand M., Chick G., Bridges I., Tomlin J., McKenna J., Nandra N., Grieco C., Quek F. F., Mercer R., Brankin-Frisby T., Sattar A., Aslam A., Edelsten E., Shafi S., Kouli T., Ford V., Gurung F., Fernandes M., Deader N., Ponniah R., Jamieson S., Davies A., Taubwurcel J., Aung M. T., Desai R., Begum S., Jamadar T., Kangatharan A., Rzeszowski B., Ho C., Yap S. H. K., Prendergast M., Sethi R., Duku A., Lowe C., Bray J., Ghobrial M., Nichita V., Wagstaff A., Rengasamy E., Abu Hassan F., Mahmood H., Savill N., Shah S., Almeida T., Edwards A., Catchpole B., Halford Z., Carmichael A., Alsusa H., Boyd M., Williams J., Feyi-Waboso J., Patel M., Zeidan Z., Bailey E., Bapty J., Brazkiewicz M., Tremlett A., Pringle H., Mankal S., Chung W., Parry-Jones E., Anderson K., Mcforrester A., Stanley A., Hoather A., Wise H., Laid I., Scriven J., Braniste A., Wilson A., Le Blevec L., Pakunwanich N., Evans N., Chong H. L., White C., Hunter J., Haque M., Vanalia P., Murdoch S., Choudhary T., McCann A., Harun A., Shah H., Hunt S., Shafiq Y., Bickley-Morris E., Emms L., Dare M., Akula Y., Deliyannis E., Mayes F., Ellacott M., Zagorac Z., Farren A., Manning C., Hughed C., Stewart E. G., Lim K. 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A., Kurtenkov M., Jovanovic M., Vician M., Egea Arias P., Beltran de Heredia J., Labalde Martinez M., De Santiago Alvarez I., Alvarez-Gallego M., Rodriguez Artigas J. M., Dwidar O., Korkmaz H. K., Eray I. C., Meric S., Aydin R., Cetin B., Karaca B. E., Kuyumcu O. F., Yuksel E., Uprak T. K., Karabulut K., Kavukcu E., Mansor A., Hackett R., Zammit-Maempel M., Sabaratnam R., Maan A., Ferarrio I., Dixon L., Halai H., Sethi S., Nelson L., Grassam-rowe A., Krishnan E., Deeny D., McKeever M., George Pandeth A., Dhavala P., Sreenivasan S., Sundaram Venkatesan G., Zhu L., Atiyah Z., Gregory J., Morey T., Seymour Z., Holdsworth L., Abdelmahmoud S., Bourhill J., Bisheet G., Shaw J., Kulkarni K., Kumarakulasingam P., Pillay S., Al-Habsi R., Kungwengwe G., Richards J., Davoudi K., Ibrahim B., Tailor B., Zayed M., Chen F., Bailey S., Sheefat S., Nawaz G., Pawar R., Marsh S., Sam Z. H., Roy Bentley S., Simpson C., Hughes J., Lim Y., Ooi R., Toh W. H., Mannion P., Lovett A., Kincius A., Hussein S., Kirby E., Beckett R. G., Salmon J., Glynn T., Choo S. Y., Lyons S., Browne D., Ravindran W., Ahmad S., Zhu X., McNulty J., McCarthy L., Ng J., Karmally Z., McTeir K., Hanna M., Tan E., Namdeo S., Schembri R., and Pusey E.

Abstract

Aim: Intraperitoneal drains are often placed during emergency colorectal surgery. However, there is a lack of evidence supporting their use. This study aimed to describe the efficacy and safety of intraperitoneal drain placement after emergency colorectal surgery. Method: COMPlicAted intra-abdominal collectionS after colorectal Surgery (COMPASS) is a prospective, international, cohort study into which consecutive adult patients undergoing emergency colorectal surgery were enrolled (from 3 February 2020 to 8 March 2020). The primary outcome was the rate of intraperitoneal drain placement. Secondary outcomes included rate and time-to-diagnosis of postoperative intraperitoneal collections, rate of surgical site infections (SSIs), time to discharge and 30-day major postoperative complications (Clavien–Dindo III–V). Multivariable logistic and Cox proportional hazards regressions were used to estimate the independent association of the outcomes with drain placement. Results: Some 725 patients (median age 68.0 years; 349 [48.1%] women) from 22 countries were included. The drain insertion rate was 53.7% (389 patients). Following multivariable adjustment, drains were not significantly associated with reduced rates (odds ratio [OR] = 1.56, 95% CI: 0.48–5.02, p = 0.457) or earlier detection (hazard ratio [HR] = 1.07, 95% CI: 0.61–1.90, p = 0.805) of collections. Drains were not significantly associated with worse major postoperative complications (OR = 1.26, 95% CI: 0.67–2.36, p = 0.478), delayed hospital discharge (HR = 1.11, 95% CI: 0.91–1.36, p = 0.303) or increased risk of SSIs (OR = 1.61, 95% CI: 0.87–2.99, p = 0.128). Conclusion: This is the first study investigating placement of intraperitoneal drains following emergency colorectal surgery. The safety and clinical benefit of drains remain uncertain. Equipoise exists for randomized trials to define the safety and efficacy of drains in emergency colorectal surgery.

Published
2023

46. Precise Predictions for W + 3 Jet Production at Hadron Colliders

Author

Berger, C. F., Bern, Z., Dixon, L. J., Cordero, F. Febres, Forde, D., Gleisberg, T., Ita, H., Kosower, D. A., and Maitre, D.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

We report on the first next-to-leading order QCD computation of W + 3-jet production in hadronic collisions including all partonic subprocesses. We compare the results with CDF data from the Tevatron, and find excellent agreement. The renormalization and factorization scale dependence is reduced substantially compared to leading-order calculations. The required one-loop matrix elements are computed using on-shell methods, implemented in a numerical program, BlackHat. We use the SHERPA package to generate the real-emission contributions and to integrate the various contributions over phase space. We use a leading-color (large-N_c) approximation for the virtual part, which we confirm in W + 1,2-jet production to be valid to within three percent. The present calculation demonstrates the utility of on-shell methods for computing next-to-leading-order corrections to processes important to physics analyses at the Large Hadron Collider., Comment: 5 pages, 3 figures, RevTex, v3 small change in values, no changes in conclusions

Published
2009
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47. Carbon and nitrogen in soil and vine roots in harrowed and grass-covered vineyards

Author

Agnelli, A, Bol, R, Trumbore, SE, Dixon, L, Cocco, S, and Corti, G

Subjects
Soil organic matter, Humic substances, Stable isotopes, Radiocarbon dating, Stocks of C and N, Root production, Environmental Sciences, Agricultural and Veterinary Sciences, Studies in Human Society, Agronomy & Agriculture
Abstract

To examine the effects of vineyard soil management on soil C and N content and quality, we studied harrowed and grass-covered vineyards on a soil developed on plio-pleistocene, marine sediments. A soil naturally covered by grasses adjacent to the vineyards served as control. To reach this goal, we assessed (1) the distribution of C and N and their 13C and 15N signatures in different soil organic matter pools, (2) the amount of C and N as live and dead vine fine roots and their 13C, 15N and 14C signatures, and (3) the stocks of C and N forms accumulated at two soil-depth intervals (0-50 and 50-100cm).Independent of the soil management, the vines increased the total organic C and total N content in the deeper soil horizons because of root turnover and rhizodeposition processes. In the upper horizons, a greater organic matter accumulation was fostered by the presence of the grass cover and the absence of tillage. The grass cover favoured the organic C storage mainly in the form of particulate and highly stabilised organic matter (humic acids and humin), and reduced the soil N content by plant uptake, whereas the harrowing produced a greater abundance of fulvic acids, which were mainly ascribed to oxidative processes enhanced by the soil tillage. In both vineyard soils, decaying vine roots represented an important source of organic C and N, especially in the deepest horizons. Indeed, isotope analyses revealed a more intense degradation of the dead vine roots in the deeper soil portion, where they likely constituted the main substrate for soil microorganisms. In the deepest horizons of the grass-covered vineyard, the greater mean residence time of the decaying vine roots and the lower root production were attributed to the easily available energetic substrates supplied by grass root turnover and rhizodeposition, which were preferentially used by microorganisms. This fact fostered a larger C accumulation in the grass-covered than in the harrowed vineyard. © 2014 Elsevier B.V.

Published
2014

49. Using selected Habitat European Directive species as garden plants: challenges and opportunities

Author

Mariotti, M., primary, Bonomi, C., additional, Magrini, S., additional, Bacchetta, G., additional, Bavcon, J., additional, Casolo, V., additional, Ceriani, R.M., additional, Di Martino, L., additional, Dixon, L., additional, Fabrini, G., additional, Raimondi, S., additional, Salmeri, C., additional, Villani, M., additional, Buhagiar, J., additional, and Cristaudo, A., additional

Published
2023
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50. Manifest Ultraviolet Behavior for the Three-Loop Four-Point Amplitude of N=8 Supergravity

Author

Bern, Z., Carrasco, J. J. M., Dixon, L. J., Johansson, H., and Roiban, R.

Subjects
High Energy Physics - Theory
Abstract

Using the method of maximal cuts, we obtain a form of the three-loop four-point scattering amplitude of N=8 supergravity in which all ultraviolet cancellations are made manifest. The Feynman loop integrals that appear have a graphical representation with only cubic vertices, and numerator factors that are quadratic in the loop momenta, rather than quartic as in the previous form. This quadratic behavior reflects cancellations beyond those required for finiteness, and matches the quadratic behavior of the three-loop four-point scattering amplitude in N=4 super-Yang-Mills theory. By direct integration we confirm that no additional cancellations remain in the N=8 supergravity amplitude, thus demonstrating that the critical dimension in which the first ultraviolet divergence occurs at three loops is D_c=6. We also give the values of the three-loop divergences in D=7,9,11. In addition, we present the explicitly color-dressed three-loop four-point amplitude of N=4 super-Yang-Mills theory., Comment: 38 pages, 10 figures, 3 tables

Published
2008
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