Production of W's with large transverse momentum at the CERN proton-antiproton collider

UA1 Collaboration; R. Edgecock

doi:10.1016/0370-2693(87)91257-3

Production of W's with large transverse momentum at the CERN proton-antiproton collider

UA1 Collaboration, R. Edgecock

Research output: Contribution to journal › Article › peer-review

43 Citations (Scopus)

Abstract

We have measured the W transverse momentum distribution (p_T^W) using a sample of 323 W → eν and W → μν events produced in proton-antiproton collisions at the CERN collider. In the present letter we extend the study of the distribution up to p_T^W ∼- m_W and compare to leading and higher order QCD. This comparison is a precise test of QCD with hadron colliders and the inclusive spectrum gives good agreement over a large range of p_T^W. However we observed two events at very large p_T^W (∼- 100 GeV/c) in which the W candidate recoils against an energetic di-jet system. Both events have a very large missing transverse energy and a jet-jet mass compatible with the W mass. In a separate analysis, a topologically similar event has been observed in which a high-mass di-jet system is balanced by a large missing transverse energy which could be interpreted as Z⁰ → νν decay. We cannot easily explain these three events in terms of explicit second-order QCD calculations. However we cannot exclude at this stage the possibility that they are the result of non-gaussian fluctuations in the response of UA1 calorimetry or a statistical fluctuation in the data.

Original language	English
Pages (from-to)	389-398
Number of pages	10
Journal	Physics Letters B
Volume	193
Issue number	2-3
DOIs	https://doi.org/10.1016/0370-2693(87)91257-3
Publication status	Published - 16 Jul 1987
Externally published	Yes

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@article{4444d0caf7d1426090f004acf9e9e74e,

title = "Production of W's with large transverse momentum at the CERN proton-antiproton collider",

abstract = "We have measured the W transverse momentum distribution (pTW) using a sample of 323 W → eν and W → μν events produced in proton-antiproton collisions at the CERN collider. In the present letter we extend the study of the distribution up to pTW ∼- m W and compare to leading and higher order QCD. This comparison is a precise test of QCD with hadron colliders and the inclusive spectrum gives good agreement over a large range of pTW. However we observed two events at very large pTW (∼- 100 GeV/c) in which the W candidate recoils against an energetic di-jet system. Both events have a very large missing transverse energy and a jet-jet mass compatible with the W mass. In a separate analysis, a topologically similar event has been observed in which a high-mass di-jet system is balanced by a large missing transverse energy which could be interpreted as Z0 → νν decay. We cannot easily explain these three events in terms of explicit second-order QCD calculations. However we cannot exclude at this stage the possibility that they are the result of non-gaussian fluctuations in the response of UA1 calorimetry or a statistical fluctuation in the data.",

keywords = "CERN collider, UA1 experiment",

author = "{UA1 Collaboration} and C. Albajar and Albrow, {M. G.} and Allkofer, {O. C.} and G. Arnison and A. Astbury and B. Aubert and T. Axon and C. Bacci and T. Bacon and N. Bains and Batley, {J. R.} and G. Bauer and S. Beingessner and J. Bellinger and A. Bettini and A. Bezaguet and K. Bos and E. Buckley and G. Busetto and P. Catz and P. Cennini and S. Centro and F. Ceradini and Charlton, {D. G.} and G. Ciapetti and S. Cittolin and D. Clarke and D. Cline and C. Cochet and J. Colas and P. Colas and M. Corden and Coughlan, {J. A.} and G. Cox and D. Dau and M. Debeer and Debrion, {J. P.} and M. Degiorgi and {Della Negra}, M. and M. Demoulin and B. Denby and D. Denegri and A. Diciaccio and L. Dobrzynski and J. Dorenbosch and Dowell, {J. D.} and E. Duchovni and R. Edgecock and K. Eggert and E. Eisenhandler",

year = "1987",

month = jul,

day = "16",

doi = "10.1016/0370-2693(87)91257-3",

language = "English",

volume = "193",

pages = "389--398",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "2-3",

}

TY - JOUR

T1 - Production of W's with large transverse momentum at the CERN proton-antiproton collider

AU - UA1 Collaboration

AU - Albajar, C.

AU - Albrow, M. G.

AU - Allkofer, O. C.

AU - Arnison, G.

AU - Astbury, A.

AU - Aubert, B.

AU - Axon, T.

AU - Bacci, C.

AU - Bacon, T.

AU - Bains, N.

AU - Batley, J. R.

AU - Bauer, G.

AU - Beingessner, S.

AU - Bellinger, J.

AU - Bettini, A.

AU - Bezaguet, A.

AU - Bos, K.

AU - Buckley, E.

AU - Busetto, G.

AU - Catz, P.

AU - Cennini, P.

AU - Centro, S.

AU - Ceradini, F.

AU - Charlton, D. G.

AU - Ciapetti, G.

AU - Cittolin, S.

AU - Clarke, D.

AU - Cline, D.

AU - Cochet, C.

AU - Colas, J.

AU - Colas, P.

AU - Corden, M.

AU - Coughlan, J. A.

AU - Cox, G.

AU - Dau, D.

AU - Debeer, M.

AU - Debrion, J. P.

AU - Degiorgi, M.

AU - Della Negra, M.

AU - Demoulin, M.

AU - Denby, B.

AU - Denegri, D.

AU - Diciaccio, A.

AU - Dobrzynski, L.

AU - Dorenbosch, J.

AU - Dowell, J. D.

AU - Duchovni, E.

AU - Edgecock, R.

AU - Eggert, K.

AU - Eisenhandler, E.

PY - 1987/7/16

Y1 - 1987/7/16

N2 - We have measured the W transverse momentum distribution (pTW) using a sample of 323 W → eν and W → μν events produced in proton-antiproton collisions at the CERN collider. In the present letter we extend the study of the distribution up to pTW ∼- m W and compare to leading and higher order QCD. This comparison is a precise test of QCD with hadron colliders and the inclusive spectrum gives good agreement over a large range of pTW. However we observed two events at very large pTW (∼- 100 GeV/c) in which the W candidate recoils against an energetic di-jet system. Both events have a very large missing transverse energy and a jet-jet mass compatible with the W mass. In a separate analysis, a topologically similar event has been observed in which a high-mass di-jet system is balanced by a large missing transverse energy which could be interpreted as Z0 → νν decay. We cannot easily explain these three events in terms of explicit second-order QCD calculations. However we cannot exclude at this stage the possibility that they are the result of non-gaussian fluctuations in the response of UA1 calorimetry or a statistical fluctuation in the data.

AB - We have measured the W transverse momentum distribution (pTW) using a sample of 323 W → eν and W → μν events produced in proton-antiproton collisions at the CERN collider. In the present letter we extend the study of the distribution up to pTW ∼- m W and compare to leading and higher order QCD. This comparison is a precise test of QCD with hadron colliders and the inclusive spectrum gives good agreement over a large range of pTW. However we observed two events at very large pTW (∼- 100 GeV/c) in which the W candidate recoils against an energetic di-jet system. Both events have a very large missing transverse energy and a jet-jet mass compatible with the W mass. In a separate analysis, a topologically similar event has been observed in which a high-mass di-jet system is balanced by a large missing transverse energy which could be interpreted as Z0 → νν decay. We cannot easily explain these three events in terms of explicit second-order QCD calculations. However we cannot exclude at this stage the possibility that they are the result of non-gaussian fluctuations in the response of UA1 calorimetry or a statistical fluctuation in the data.

KW - CERN collider

KW - UA1 experiment

UR - http://www.scopus.com/inward/record.url?scp=10444251612&partnerID=8YFLogxK

U2 - 10.1016/0370-2693(87)91257-3

DO - 10.1016/0370-2693(87)91257-3

M3 - Article

AN - SCOPUS:10444251612

VL - 193

SP - 389

EP - 398

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

IS - 2-3

ER -

Production of W's with large transverse momentum at the CERN proton-antiproton collider

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