Z′ at the LHC: interference and finite width effects in Drell-Yan

被引：64

作者：

Accomando, Elena ^{[1
,2
]}

Becciolini, Diego ^{[3
,4
]}

Belyaev, Alexander ^{[1
,2
]}

Moretti, Stefano ^{[1
,2
]}

Shepherd-Themistocleous, Claire ^{[2
]}

机构：

[1] Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England

[2] Rutherford Appleton Lab, Particle Phys Dept, Didcot OX11 0QX, Oxon, England

[3] Univ Southern Denmark, Origins CP3, DK-5230 Odense M, Denmark

[4] Univ Southern Denmark, DIAS, DK-5230 Odense M, Denmark

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2013年 / 10期

基金：

新加坡国家研究基金会;

关键词：

Phenomenological Models; Hadronic Colliders; TRANSVERSE ENERGY; PHYSICS; COLLISIONS; ELECTRONS; SEARCH; BOSONS;

D O I：

10.1007/JHEP10(2013)153

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The interference effects between an extra neutral spin-1 Z'-boson and the Standard Model background in the Drell-Yan channel at the LHC are studied in detail. The final state with two oppositely charged leptons is considered. The interference contribution to the new physics signal, currently not fully taken into account by experimental collaborations in Z'-searches and in the interpretation of the results, can be substantial. It may affect limits or discovery prospects of Z' at the LHC. As the Z'-boson interference is model-dependent, a proper treatment would a priori require a dedicated experimental analysis for each particular model. Doing so could potentially improve the sensitivity to new physics, but would require significantly more experimental effort. At the same time, it is shown that one can define an invariant mass window, valid for a wide range of models, for which the contribution of the model-dependent interference to the Beyond the Standard Model signal is reduced to O(10%), comparable to the level of the combined uncertainty from parton densities and higher order corrections. This quasi-model-independent "magic cut" does not scale with the mass of the Z'-boson and is approximately constant over a large range of masses. Such control of the interference effects relies on not-too-small branching ratios of Z' to leptons (typically of at least a few percent) which can be suppressed, however, by additional new decay channels of the Z'; a small width-to-mass ratio alone does not guarantee the interference to be small over an arbitrary kinematic range. Under the general assumption that these new decay channels of Z' are not dominant, one can perform quasi-model-independent analyses, preserving the current scheme used by the experimental collaborations for the Z'-boson search using the suggested invariant mass window cut.

引用

页数：16

共 44 条

[1]

Aad G, 2012, EUR PHYS J C, V72, DOI 10.1140/epjc/s10052-012-2241-5

[2]

Aad G, 2012, J HIGH ENERGY PHYS, DOI [10.1007/JHEP12(2012)007, 10.1007/JHEP11(2012)138]

[3] Search for W′ boson resonances decaying to a top quark and a bottom quark [J].

Abazov, V. M. ;

Abbott, B. ;

Abolins, M. ;

Acharya, B. S. ;

Adams, M. ;

Adams, T. ;

Aguilo, E. ;

Ahn, S. H. ;

Ahsan, M. ;

Alexeev, G. D. ;

Alkhazov, G. ;

Alton, A. ;

Alverson, G. ;

Alves, G. A. ;

Anastasoaie, M. ;

Ancu, L. S. ;

Andeen, T. ;

Anderson, S. ;

Andrieu, B. ;

Anzelc, M. S. ;

Aoki, M. ;

Arnoud, Y. ;

Arov, M. ;

Arthaud, M. ;

Askew, A. ;

Asman, B. ;

Jesus, A. C. S. Assis ;

Atramentov, O. ;

Avila, C. ;

Ay, C. ;

Badaud, F. ;

Baden, A. ;

Bagby, L. ;

Baldin, B. ;

Bandurin, D. V. ;

Banerjee, P. ;

Banerjee, S. ;

Barberis, E. ;

Barfuss, A. -F. ;

Bargassa, P. ;

Baringer, P. ;

Barreto, J. ;

Bartlett, J. F. ;

Bassler, U. ;

Bauer, D. ;

Beale, S. ;

Bean, A. ;

Begalli, M. ;

Begel, M. ;

Belanger-Champagne, C. .

PHYSICAL REVIEW LETTERS, 2008, 100 (21)

[4] Search for W′ bosons decaying to an electron and a neutrino with the D0 detector [J].

Abazov, V. M. ;

Abbott, B. ;

Abolins, M. ;

Acharya, B. S. ;

Adams, M. ;

Adams, T. ;

Aguilo, E. ;

Ahn, S. H. ;

Ahsan, M. ;

Alexeev, G. D. ;

Alkhazov, G. ;

Alton, A. ;

Alverson, G. ;

Alves, G. A. ;

Anastasoaie, M. ;

Ancu, L. S. ;

Andeen, T. ;

Anderson, S. ;

Andrieu, B. ;

Anzelc, M. S. ;

Arnoud, Y. ;

Arov, M. ;

Arthaud, M. ;

Askew, A. ;

Asman, B. ;

Jesus, A. C. S. Assis ;

Atramentov, O. ;

Autermann, C. ;

Avila, C. ;

Ay, C. ;

Badaud, F. ;

Baden, A. ;

Bagby, L. ;

Baldin, B. ;

Bandurin, D. V. ;

Banerjee, S. ;

Banerjee, P. ;

Barberis, E. ;

Barfuss, A. -F. ;

Bargassa, P. ;

Baringer, P. ;

Barreto, J. ;

Bartlett, J. F. ;

Bassler, U. ;

Bauer, D. ;

Beale, S. ;

Bean, A. ;

Begalli, M. ;

Begel, M. ;

Belanger-Champagne, C. .

PHYSICAL REVIEW LETTERS, 2008, 100 (03)

[5] Search for W' → tb resonances with left- and right-handed couplings to fermions D0 Collaboration [J].

Abazov, V. M. ;

Abbott, B. ;

Acharya, B. S. ;

Adams, M. ;

Adams, T. ;

Alexeev, G. D. ;

Alkhazov, G. ;

Alton, A. ;

Alverson, G. ;

Alves, G. A. ;

Ancu, L. S. ;

Aoki, M. ;

Arov, M. ;

Askew, A. ;

Asman, B. ;

Atramentov, O. ;

Avila, C. ;

BackusMayes, J. ;

Badaud, F. ;

Bagby, L. ;

Baldin, B. ;

Bandurin, D. V. ;

Banerjee, S. ;

Barberis, E. ;

Baringer, P. ;

Barreto, J. ;

Bartlett, J. F. ;

Bassler, U. ;

Bazterra, V. ;

Beale, S. ;

Bean, A. ;

Begalli, M. ;

Beget, M. ;

Belanger-Champagne, C. ;

Bellantoni, L. ;

Beri, S. B. ;

Bernardi, G. ;

Bernhard, R. ;

Bertram, I. ;

Besancon, M. ;

Beuselinck, R. ;

Bezzubov, V. A. ;

Bhat, Rc. ;

Bhatnagar, V. ;

Blazey, G. ;

Blessing, S. ;

Bloom, K. B. K. ;

Boehnlein, A. ;

Boline, D. ;

Bolton, T. A. .

PHYSICS LETTERS B, 2011, 699 (03) :145-150

[6] Search for a heavy neutral gauge boson in the dielectron channel with 5.4 fb-1 of p(p)over-bar collisions at √s=1.96 TeV [J].

Abazov, V. M. ;

Abbott, B. ;

Abolins, M. ;

Acharya, B. S. ;

Adams, M. ;

Adams, T. ;

Alexeev, G. D. ;

Alkhazov, G. ;

Alton, A. ;

Alverson, G. ;

Alves, G. A. ;

Ancu, L. S. ;

Aoki, M. ;

Arnoud, Y. ;

Arov, M. ;

Askew, A. ;

Asman, B. ;

Atramentov, O. ;

Avila, C. ;

BackusMayes, J. ;

Badaud, F. ;

Bagby, L. ;

Baldin, B. ;

Bandurin, D. V. ;

Banerjee, S. ;

Barberis, E. ;

Baringer, P. ;

Barreto, J. ;

Bartlett, J. F. ;

Bassler, U. ;

Beale, S. ;

Bean, A. ;

Begalli, M. ;

Begel, M. ;

Belanger-Champagne, C. ;

Bellantoni, L. ;

Benitez, J. A. ;

Beri, S. B. ;

Bernardi, G. ;

Bernhard, R. ;

Bertram, I. ;

Besancon, M. ;

Beuselinck, R. ;

Bezzubov, V. A. ;

Bhat, P. C. ;

Bhatnagar, V. ;

Blazey, G. ;

Blessing, S. ;

Bloom, K. ;

Boehnlein, A. .

PHYSICS LETTERS B, 2011, 695 (1-4) :88-94

[7] Interference effects in heavy W′-boson searches at the LHC [J].

Accomando, Elena ;

Becciolini, Diego ;

De Curtis, Stefania ;

Dominici, Daniele ;

Fedeli, Luca ;

Shepherd-Themistocleous, Claire .

PHYSICAL REVIEW D, 2012, 85 (11)

[8] Z′ physics with early LHC data [J].

Accomando, Elena ;

Belyaev, Alexander ;

Fedeli, Luca ;

King, Stephen F. ;

Shepherd-Themistocleous, Claire .

PHYSICAL REVIEW D, 2011, 83 (07)

[9] SEARCHING FOR NEW HEAVY VECTOR BOSONS IN PP-BAR COLLIDERS [J].

ALTARELLI, G ;

MELE, B ;

RUIZALTABA, M .

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1989, 45 (01) :109-121

[10] CORRECTION [J].

ALTARELLI, G .

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1990, 47 (04) :676-676

← 1 2 3 4 5 →