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Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)最新文献

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NNLO Parton Distributions for the LHC LHC的NNLO部子分布
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018) Pub Date : 2018-10-02 DOI: 10.22323/1.303.0049
S. Alekhin, J. Bluemlein, S. Moch
{"title":"NNLO Parton Distributions for the LHC","authors":"S. Alekhin, J. Bluemlein, S. Moch","doi":"10.22323/1.303.0049","DOIUrl":"https://doi.org/10.22323/1.303.0049","url":null,"abstract":"We consider some trends, achievements and a series of remaining problems in the precision determination of parton distribution functions. For the description of the scaling violations of the deep-inelastic scattering data, forming the key ingredients to all PDF fits, a solid theoretical framework is of importance. It is provided by the fixed flavor number scheme in describing the heavy-quark contributions which is found in good agreement with the present experimental data in a very wide range of momentum transfers. In this framework also a consistent determination of the heavy-quark masses is possible at high precision. The emerging Drell-Yan data measured at hadron colliders start to play a crucial role in disentangling the quark species, particularly at small and large values of $x$. These new inputs demonstrate a good overall consistency with the earlier constraints on the PDFs coming from fixed-target experiments. No dramatic change is observed in the PDFs in case of a consistent account of the higher-order QCD corrections and when leaving enough flexibility in the PDF shape parameterization.","PeriodicalId":140132,"journal":{"name":"Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124132012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 56
Soft gluons and top quark pair production 软胶子和顶夸克对的产生
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018) Pub Date : 2018-10-02 DOI: 10.22323/1.303.0060
Li Lin Yang
{"title":"Soft gluons and top quark pair production","authors":"Li Lin Yang","doi":"10.22323/1.303.0060","DOIUrl":"https://doi.org/10.22323/1.303.0060","url":null,"abstract":"In this talk we summarize two recent efforts towards improving the theoretical predictions for the differential cross sections in top quark pair production. Both are related to the effect of soft gluons. The first result is the analytic calculation of the NNLO massive soft function which is an important ingredient in the resummation of threshold logarithms. The second is the matched NNLO+NNLL$'$ predictions which combine state-of-the-art NNLO QCD calculations with double resummation at NNLL$'$ accuracy of threshold logarithms arising from soft gluon emissions and of small mass logarithms.","PeriodicalId":140132,"journal":{"name":"Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126079491","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The number of master integrals as Euler characteristic 主积分的数量为欧拉特征
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018) Pub Date : 2018-09-10 DOI: 10.22323/1.303.0065
Thomas Bitoun, C. Bogner, René Pascal Klausen, E. Panzer
{"title":"The number of master integrals as Euler characteristic","authors":"Thomas Bitoun, C. Bogner, René Pascal Klausen, E. Panzer","doi":"10.22323/1.303.0065","DOIUrl":"https://doi.org/10.22323/1.303.0065","url":null,"abstract":"We give a brief introduction to a parametric approach for the derivation of shift relations between Feynman integrals and a result on the number of master integrals. The shift relations are obtained from parametric annihilators of the Lee-Pomeransky polynomial $mathcal{G}$. By identification of Feynman integrals as multi-dimensional Mellin transforms, we show that this approach generates every shift relation. Feynman integrals of a given family form a vector space, whose finite dimension is naturally interpreted as the number of master integrals. This number is an Euler characteristic of the polynomial $mathcal{G}$.","PeriodicalId":140132,"journal":{"name":"Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123971497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
NLO mixed QCD-EW corrections to Higgs gluon fusion NLO混合QCD-EW对希格斯胶子聚变的修正
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018) Pub Date : 2018-09-07 DOI: 10.22323/1.303.0059
M. Bonetti
{"title":"NLO mixed QCD-EW corrections to Higgs gluon fusion","authors":"M. Bonetti","doi":"10.22323/1.303.0059","DOIUrl":"https://doi.org/10.22323/1.303.0059","url":null,"abstract":"The study of the Higgs boson properties is one of the main tasks of contemporary high-energy physics. Among Higgs properties, its interaction with gluons is interesting since it can be facilitated by yet unknown elementary particles. One of the major sources of uncertainty in the theoretical description of $ggH$ coupling originates from mixed QCD-electroweak contributions. The NLO QCD corrections to these contributions were evaluated in the approximation where electroweak boson masses were considered to be significantly larger than the mass of the Higgs boson and it is desirable to compute these corrections for physical masses of the gauge bosons and the Higgs boson. We present a major step towards this goal and describe first the analytic evaluation of NLO mixed QCD-EW three-loop virtual corrections to $gg to H$, and then their implementation in the evaluation of the total cross section for $gg to H$ in the soft-gluon approximation for real corrections.","PeriodicalId":140132,"journal":{"name":"Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114264122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Anomalous dimensions and splitting functions beyond the next-to-next-to-leading order 异常维度和分裂函数超出了倒数第二到倒数第一的顺序
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018) Pub Date : 2018-08-27 DOI: 10.22323/1.303.0050
A. Vogt, F. Herzog, S. Moch, B. Ruijl, Takahiro Ueda, J. Vermaseren
{"title":"Anomalous dimensions and splitting functions beyond the next-to-next-to-leading order","authors":"A. Vogt, F. Herzog, S. Moch, B. Ruijl, Takahiro Ueda, J. Vermaseren","doi":"10.22323/1.303.0050","DOIUrl":"https://doi.org/10.22323/1.303.0050","url":null,"abstract":"We report on recent progress on the splitting functions for the evolution of parton distributions and related quantities, the (lightlike) cusp anomalous dimensions, in perturbative QCD. New results are presented for the four-loop (next-to-next-to-next-to-leading order, N^3LO) contributions to the flavour-singlet splitting functions and the gluon cusp anomalous dimension. We present first results, the moments N=2 and N=3, for the five-loop (N^4LO) non-singlet splitting functions.","PeriodicalId":140132,"journal":{"name":"Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122945041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Sector-improved residue subtraction: Improvements and Applications 扇区改进剩余减法:改进和应用
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018) Pub Date : 2018-08-23 DOI: 10.22323/1.303.0024
A. Behring, M. Czakon, R. Poncelet
{"title":"Sector-improved residue subtraction: Improvements and Applications","authors":"A. Behring, M. Czakon, R. Poncelet","doi":"10.22323/1.303.0024","DOIUrl":"https://doi.org/10.22323/1.303.0024","url":null,"abstract":"We discuss two recent developments of the sector-improved residue subtraction scheme for handling real radiation at NNLO in QCD. We present a new phase space construction which minimizes the number phase space configurations for subtraction terms and we rederive the four-dimensional formulation of the scheme.","PeriodicalId":140132,"journal":{"name":"Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125152110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Automated Calculation of N-jet Soft Functions n -射流软函数的自动计算
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018) Pub Date : 2018-08-22 DOI: 10.22323/1.303.0044
G. Bell, B. Dehnadi, Tobias Mohrmann, R. Rahn
{"title":"Automated Calculation of N-jet Soft Functions","authors":"G. Bell, B. Dehnadi, Tobias Mohrmann, R. Rahn","doi":"10.22323/1.303.0044","DOIUrl":"https://doi.org/10.22323/1.303.0044","url":null,"abstract":"We present a systematic framework for the calculation of soft functions that are defined in terms of N ≥ 2 light-like Wilson lines. The formalism represents an extension of a method that we developed earlier for the calculation of dijet soft functions to the general N-jet case. We discuss the technical aspects of this generalisation, focussing on SCET-1 soft functions that obey the non-Abelian exponentiation theorem in this contribution. As a first application of our method, we consider the N-jettiness observable and present numerical results for the 1-jettiness and 2-jettiness hadron-collider soft functions to next-to-next-to-leading order in the perturbative expansion.","PeriodicalId":140132,"journal":{"name":"Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)","volume":"71 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113961111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Loop calculations for models of graphene 石墨烯模型的回路计算
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018) Pub Date : 2018-08-15 DOI: 10.22323/1.303.0070
J. Gracey
{"title":"Loop calculations for models of graphene","authors":"J. Gracey","doi":"10.22323/1.303.0070","DOIUrl":"https://doi.org/10.22323/1.303.0070","url":null,"abstract":"© Copyright owned by the author(s) under the terms of the Creative Commons. The various Gross-Neveu classes of quantum field theories are of interest in the study of a particular phase transition in graphene. We review recent activity in the determination of several critical exponents in the chiral Heisenberg Gross-Neveu universality class using the critical point large N technique which includes the use of the large N conformal bootstrap method.","PeriodicalId":140132,"journal":{"name":"Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122092283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Effects of anomalous triple-gauge-boson interactions in diboson production with RECOLA2 反常三量规-玻色子相互作用对RECOLA2产生二玻色子的影响
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018) Pub Date : 2018-08-08 DOI: 10.22323/1.303.0012
M. Chiesa, A. Denner, J. Lang
{"title":"Effects of anomalous triple-gauge-boson interactions in diboson production with RECOLA2","authors":"M. Chiesa, A. Denner, J. Lang","doi":"10.22323/1.303.0012","DOIUrl":"https://doi.org/10.22323/1.303.0012","url":null,"abstract":"Diboson production processes are of great importance in high-energy physics and a precise the-oretical knowledge ofVV(′)production is mandatory not only in view of precision tests of theStandard Model but also in the one of new physics searches. We present results of Ref. [1],where we computed the NLO QCD and NLO electroweak corrections to diboson productionprocesses at the LHC including the effect of the anomalous triple-gauge-boson interactions atNLO QCD accuracy. The anomalous triple-gauge-boson interactions are parametrized in termsof higher-dimensional operators in the effective field theory framework. Our calculation is thefirst application of RECOLA2 to effective field theory models.","PeriodicalId":140132,"journal":{"name":"Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133326710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
No-$pi$ Theorem for Euclidean Massless Correlators 欧几里得无质量相关器的No-$pi$定理
Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018) Pub Date : 2018-08-01 DOI: 10.22323/1.303.0008
K. Chetyrkin, P. Baikov
{"title":"No-$pi$ Theorem for Euclidean Massless Correlators","authors":"K. Chetyrkin, P. Baikov","doi":"10.22323/1.303.0008","DOIUrl":"https://doi.org/10.22323/1.303.0008","url":null,"abstract":"We provide the reader with a (very) short review of recent advances in our understanding of the $pi$-dependent terms in massless (Euclidean) 2-point functions as well as in generic anomalous dimensions and $beta$-functions. We extend the considerations of [1] by one more loop, that is for the case of 6-loop correlators and 7-loop renormalization group (RG) functions.","PeriodicalId":140132,"journal":{"name":"Proceedings of Loops and Legs in Quantum Field Theory — PoS(LL2018)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116350539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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