Probing Balitsky-Fadin-Kuraev-Lipatov Dynamics in the Dijet Cross Section at Large Rapidity Intervals in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">p</mml:mi><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi mathvariant="italic">p</mml:mi></mml:mrow><mml:mrow><mml:mi>¯</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow></mml:math>Collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>√</mml:mi><mml:mi mathvariant="italic">s</mml:mi><mml:mspace/><mml:mo>=</mml:mo><mml:mspace/><mml:mn>1800</mml:mn><mml:mn/></mml:math>and 630 GeV
Braden Keim AbbottNew York University, New York, New York 10003, USAM. AbolinsMichigan State University, East Lansing, Michigan 48824V. AbramovInstitute for High Energy Physics, Protvino, RussiaB. S. AcharyaTata Institute of Fundamental Research, Mumbai, IndiaD. L. AdamsUniversity of Texas, Arlington, Texas 76019Mark Raymond AdamsUniversity of Illinois at Chicago, Chicago, Illinois 60607V. AkimovInstitute for Theoretical and Experimental Physics, Moscow, RussiaG. A. AlvesLAFEX, Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, BrazilN. AmosUniversity of Michigan–Ann Arbor, Ann Arbor, United StatesE. W. AndersonIowa State University, Ames, Iowa 50011M. M. BaarmandStony Brook University, Stony Brook, United StatesV. BabintsevInstitute for High Energy Physics, Protvino, RussiaL. BabukhadiaState University of New York, Stony Brook, New York 11794A. BadenUniversity of Maryland, College Park, Maryland 20742B. BaldinFermi National Accelerator Laboratory, Batavia, Illinois 60510S. BanerjeeTata Institute of Fundamental Research, Mumbai, IndiaJ. BantlyBrown University, Providence, Rhode Island 02912E. BarberisLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720P. BaringerUniversity of Kansas, Lawrence, Kansas 66045J. F. BartlettFermi National Accelerator Laboratory, Batavia, Illinois 60510U. BasslerUniversité Paris Cité, Paris, FranceA. BeanUniversity of Kansas, Lawrence, Kansas 66045A. BelyaevMoscow State University, Moscow, RussiaS. B. BeriPanjab University, Chandigarh, IndiaG. BernardiLaboratoire de Physique Nucléaire et de Hautes ÉnergiesI. A. BertramLancaster University, Lancaster, United KingdomV. A. BezzubovInstitute for High Energy Physics, Protvino, RussiaP. C. BhatFermi National Accelerator Laboratory, Batavia, Illinois 60510V. BhatnagarPanjab University, Chandigarh, IndiaM. BhattacharjeeStony Brook University, Stony Brook, United StatesG. BlazeyNorthern Illinois University, DeKalb, Illinois 60115S. BlessingFlorida State University, Tallahassee, Florida 32306A. BoehnleinUnited States Department of Energy, Washington, United StatesN. I. BojkoInstitute for High Energy Physics, Protvino, RussiaF. BorcherdingFermi National Accelerator Laboratory, Batavia, Illinois 60510A. BrandtUniversity of Texas, Arlington, Texas 76019R. BreedonUniversity of California, Davis, California 95616G. BriskinBrown University, Providence, Rhode Island 02912R. BrockMichigan State University, East Lansing, Michigan 48824G. BrooijmansUnited States Department of Energy, Washington, United StatesA. BrossFermi National Accelerator Laboratory, Batavia, Illinois 60510D. BuchholzNorthwestern University, Evanston, Illinois 60208V. BuescherUniversity of Rochester, Rochester, New York 14627В. С. БуртовойInstitute for High Energy Physics, Protvino, RussiaJ. M. ButlerBoston University, Boston, Massachusetts 02215W. CarvalhoUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilD. CaseyMichigan State University, East Lansing, Michigan 48824Z. CasilumStony Brook University, Stony Brook, United StatesH. Castilla-ValdezCINVESTAV, Mexico City, MexicoD. ChakrabortyStony Brook University, Stony Brook, United StatesK. M. ChanUniversity of Rochester, Rochester, New York 14627S. V. ChekulaevInstitute for High Energy Physics, Protvino, RussiaW. ChenState University of New York, Stony Brook, New York 11794D. K. ChoUniversity of Rochester, Rochester, New York 14627S. ChoiUniversity of California, Riverside, California 92521S. ChopraFlorida State University, Tallahassee, Florida 32306B. C. ChoudharyUniversity of California, Riverside, California 92521J. H. ChristensonUnited States Department of Energy, Washington, United StatesM. ChungUniversity of Illinois at Chicago, Chicago, Illinois 60607D. R. ClaesUniversity of Nebraska, Lincoln, Nebraska 68588A. R. ClarkLawrence Berkeley National Laboratory and University of California, Berkeley, California 94720W. G. CobauUniversity of Maryland, College Park, Maryland 20742J. CochranUniversity of California, Riverside, California 92521L. ConeyUniversity of Notre Dame, Notre Dame, Indiana 46556B. ConnollyFlorida State University, Tallahassee, Florida 32306W. E. CooperUnited States Department of Energy, Washington, United StatesD. CoppageUniversity of Kansas, Lawrence, Kansas 66045D. Cullen-VidalBrown University, Providence, Rhode Island 02912M.A.C. CummingsNorthern Illinois University, DeKalb, Illinois 60115D. CuttsBrown University, Providence, Rhode Island 02912O. I. DahlUniversity of California, Berkeley, Berkeley, United StatesK. DavisUniversity of Arizona, Tucson, Arizona 85721K. DeUniversity of Texas, Arlington, Texas 76019K. Del SignoreAnn Arbor Center for Independent LivingM. DemarteauUnited States Department of Energy, Washington, United StatesD. DenisovUnited States Department of Energy, Washington, United StatesS. P. DenisovInstitute for High Energy Physics, Protvino, RussiaH. T. DiehlUnited States Department of Energy, Washington, United StatesM. DiesburgUnited States Department of Energy, Washington, United StatesG. Di LoretoMichigan State University, East Lansing, United StatesP. DraperUniversity of Texas, Arlington, Texas 76019Y. DucrosDAPNIA/Service de Physique des Particules, CEA, Saclay, FranceL. DudkoMoscow State University, Moscow, RussiaS. R. DugadTata Institute of Fundamental Research, Mumbai, IndiaA. DyshkantUniversidad San Francisco de Quito, Quito, EcuadorD. EdmundsMichigan State University, East Lansing, Michigan 48824J. EllisonUniversity of California, Riverside, California 92521V. D. ElviraFermi National Accelerator Laboratory, Batavia, Illinois 60510R. EngelmannState University of New York, Stony Brook, New York 11794S. C. EnoUniversity of Maryland, College Park, Maryland 20742G. EppleyRice University, Houston, Texas 77005P. ErmolovMoscow State University, Moscow, RussiaO. V. EroshinInstitute for High Energy Physics, Protvino, RussiaJ. EstradaUniversity of Rochester, Rochester, New York 14627H. EvansColumbia University, New York, New York 10027В. Н. ЕвдокимовInstitute for High Energy Physics, Protvino, RussiaT. FahlandUniversity of California, Irvine, California 92697S. FehérUnited States Department of Energy, Washington, United StatesD. FeinUniversity of Arizona, Tucson, Arizona 85721T. FerbelUniversity of Rochester, Rochester, New York 14627
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Inclusive dijet production at large pseudorapidity intervals ( $\ensuremath{\Delta}\ensuremath{\eta}$) between the two jets has been suggested as a regime for observing Balitsky-Fadin-Kuraev-Lipatov (BFKL) dynamics. We have measured the dijet cross section for large $\ensuremath{\Delta}\ensuremath{\eta}$ in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1800$ and 630 GeV using the D0 detector. The partonic cross section increases strongly with the size of $\ensuremath{\Delta}\ensuremath{\eta}$. The observed growth is even stronger than expected on the basis of BFKL resummation in the leading logarithmic approximation. The growth of the partonic cross section can be accommodated with an effective BFKL intercept of ${\ensuremath{\alpha}}_{\mathrm{BFKL}}(20\mathrm{GeV})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.65\ifmmode\pm\else\textpm\fi{}0.07$.
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