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+====== TTP10-18 Four Loop Massless Propagators:  an Algebraic  Evaluation of All  Master Integrals ======
+      <hidden TTP10-18  Four Loop Massless Propagators:  an Algebraic  Evaluation of All  Master Integrals > The old "glue--and--cut" symmetry of massless propagators, first
+established  in [1], leads --- after reduction to \ice{corresponding} master integrals
+is performed --- to a host of non-trivial  relations between the latter.
+The relations  constrain the master integrals so tightly that  they all  can
+ be analytically expressed in terms of only few, essentially
+trivial, watermelon-like integrals. As a consequence
+we arrive at  explicit analytical results for all master
+integrals appearing in the process of reduction of massless
+propagators  at three and four loops. The transcendental structure of the results suggests  a clean  explanation of the well-known  mystery  of the absence of   even zetas ($\zeta_{2n}$)
+in the  Adler function and other similar functions essentially reducible
+to  massless propagators. Once a reduction of massless propagators at five loops is  available,  our approach should be also applicable for explicitly  performing the corresponding  five-loop master integrals.  </hidden>
+|**P.A. Baikov and K.G. Chetyrkin**  |
+|** Nucl.Phys. B837 186-220 2010  **  |
+| {{preprints:2010:ttp10-18.pdf|PDF}} {{preprints:2010:ttp10-18.ps|PostScript}} [[http://arxiv.org/abs/1004.1153|arXiv]] [[http://ttp.kit.edu/Progdata/ttp10/ttp10-18|Programs and Data]]   |
+| |

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