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❍✐❣❤❧✐❣❤ts ♦❢ t♦♣✲q✉❛r❦ ♠❡❛s✉r❡♠❡♥ts ✐♥ ❤❛❞r♦♥✐❝ ✜♥❛❧ st❛t❡s ❛t ❆❚▲❆❙ ❙❡r❡♥❛ P❛❧❛③③♦ ♦♥ ❜❡❤❛❧❢ ♦❢ t❤❡ ❆❚▲❆❙ ❝♦❧❧❛❜♦r❛t✐♦♥ ❳▲❱■■ ■♥t❡r♥❛t✐♦♥❛❧ ❙②♠♣♦s✐✉♠ ♦♥ ▼✉❧t✐♣❛rt✐❝❧❡ ❉②♥❛♠✐❝s ❚❧❛①❝❛❧❛✱ ▼❡①✐❝♦ ❙❡♣t❡♠❜❡r ✶✷✱ ✷✵✶✼ ❙❡r❡♥❛ P❛❧❛③③♦ ❙❡♣t❡♠❜❡r ✶✷✱ ✷✵✶✼ ✶ ✴ ✷✼

❖✉t❧✐♥❡ ❖✉t❧✐♥❡ � P❤②s✐❝s ♠♦t✐✈❛t✐♦♥s � ❚♦♣✲q✉❛r❦ ♣❛✐r ♣r♦❞✉❝t✐♦♥ ♠❡❝❤❛♥✐s♠s ❛♥❞ ❞❡❝❛②s � ❘❡❝❡♥t ♠❡❛s✉r❡♠❡♥ts✿ ❚♦♣✲q✉❛r❦ ✐♥❝❧✉s✐✈❡ ❝r♦ss s❡❝t✐♦♥ � ▼❡❛s✉r❡♠❡♥ts ♦❢ t❤❡ tt ♣r♦❞✉❝t✐♦♥ ❝r♦ss✲s❡❝t✐♦♥ ✐♥ t❤❡ τ ✰ ❥❡ts ❝❤❛♥♥❡❧ ❛t √ s ❂ ✼ ❚❡❱ ❊✉r✳P❤②s✳❏✳❈✭✷✵✶✸✮✼✸✿✷✸✷✽ � ▼❡❛s✉r❡♠❡♥ts ♦❢ t❤❡ tt ♣r♦❞✉❝t✐♦♥ ❝r♦ss✲s❡❝t✐♦♥ ✇✐t❤ ❤❛❞r♦♥✐❝❛❧❧② ❞❡❝❛②✐♥❣ τ ❧❡♣t♦♥ ❛t √ s ❂ ✽ ❚❡❱ P❤②s✳ ❘❡✈✳ ❉ ✾✺✱ ✵✼✷✵✵✸ ✭✷✵✶✼✮ � ▼❡❛s✉r❡♠❡♥ts ♦❢ t❤❡ tt ♣r♦❞✉❝t✐♦♥ ❝r♦ss✲s❡❝t✐♦♥ ✇✐t❤ t❤❡ τ ✰ ❧❡♣t♦♥ ❛t √ s ❂ ✼ ❚❡❱ ❈❊❘◆✲P❍✲❊P✲✷✵✶✷✲✶✵✷ � ▼❡❛s✉r❡♠❡♥ts ♦❢ t❤❡ tt ♣r♦❞✉❝t✐♦♥ ❝r♦ss✲s❡❝t✐♦♥ ✐♥ t❤❡ ❛❧❧✲❤❛❞r♦♥✐❝ ❝❤❛♥♥❡❧ ❛t √ s ❂ ✼ ❚❡❱ ❆❚▲❆❙✲❈❖◆❋✲✷✵✶✷✲✵✸✶ ❚♦♣✲q✉❛r❦ ❞✐✛❡r❡♥t✐❛❧ ❝r♦ss✲s❡❝t✐♦♥s � ▼❡❛s✉r❡♠❡♥ts ♦❢ t❤❡ tt ❞✐✛❡r❡♥t✐❛❧ ❝r♦ss✲s❡❝t✐♦♥s ✐♥ t❤❡ ❛❧❧✲❤❛❞r♦♥✐❝ ❝❤❛♥♥❡❧ ❛t √ s ❂ ✶✸ ❚❡❱ ❆❚▲❆❙✲❈❖◆❋✲✷✵✶✻✲✶✵✵ � ❙✉♠♠❛r② ❙❡r❡♥❛ P❛❧❛③③♦ ❙❡♣t❡♠❜❡r ✶✷✱ ✷✵✶✼ ✷ ✴ ✷✼

P❤②s✐❝s ♠♦t✐✈❛t✐♦♥s P❤②s✐❝s ♠♦t✐✈❛t✐♦♥s ❲❤② t♦♣✲q✉❛r❦ ♣❤②s✐❝s❄ � ■t ✐s t❤❡ ❤❡❛✈✐❡st ❡❧❡♠❡♥t❛r② ♣❛rt✐❝❧❡ ❦♥♦✇❀ m t = ✶✼✸ . ✸✹ ± ✵ . ✷✼ ( stat ) ± ✵ . ✼✶ ( syst ) ●❡❱ � ✐ts ❧❛r❣❡ ♠❛ss ✐s ❛ ❢♦✉♥❞❛♠❡♥t❛❧ ♣❛r❛♠❡t❡r ✐♥ t❤❡ ❙t❛♥❞❛r❞ ▼♦❞❡❧ ⇒ ❤✐❣❤❡st ❝♦✉♣❧✐♥❣ t♦ t❤❡ ❍✐❣❣s ❜♦s♦♥❀ � ❞✉❡ ✐ts ✈❡r② s❤♦rt ❧✐❢❡t✐♠❡✱ t❤❡ t♦♣✲q✉❛r❦ ❞❡❝❛②s ❜❡❢♦r❡ ❤❛❞r♦♥✐③✐♥❣ t ⇒ Wb ∼ ✶✵ − ✷✹ s ✈s ❤❛❞r♦♥✐③❛t✐♦♥ ∼ ✶✵ − ✷✸ s ⇒ ❛❧❧♦✇s t♦ st✉❞② t❤❡ ♣r♦♣❡rt✐❡s ♦❢ ❛ ❜❛r❡ q✉❛r❦❀ � ✐ts ❝r♦ss✲s❡❝t✐♦♥ ✐s ❧❛r❣❡ � ∼ ✶✺ tt ♣❛✐rs✴♠✐♥✱ ∼ ✺ ♠✐❧✐♦♥s tt ❛t ✽ ❚❡❱ ✇✐t❤ ✷✵ fb − ✶ � ∼ ✺✵✵ tt ♣❛✐rs✴♠✐♥✱ ∼ ✸✵ ♠✐❧✐♦♥s tt ❛t ✶✸ ❚❡❱ ✇✐t❤ ✸✻ fb − ✶ ❙❡r❡♥❛ P❛❧❛③③♦ ❙❡♣t❡♠❜❡r ✶✷✱ ✷✵✶✼ ✸ ✴ ✷✼

❚♦♣✲q✉❛r❦ ♣❛✐r ♣r♦❞✉❝t✐♦♥ ❚♦♣✲q✉❛r❦ ♣❛✐r ♣r♦❞✉❝t✐♦♥ � ❚♦♣✲q✉❛r❦ ♣❛✐rs ♣r♦❞✉❝t✐♦♥ ✈✐❛ str♦♥❣ ✐♥t❡r❛❝t✐♦♥s❀ � t❤❡ ▲❖ ❞♦♠✐♥❛♥t ♣r♦❝❡ss ❛t √ s ❂ ✶✸ ❚❡❱ ❛t ▲❍❈ ✐s t❤❡ ❣❧✉♦♥✲❣❧✉♦♥ ❢✉s✐♦♥❀ ❣❧✉♦♥✲❣❧✉♦♥ ❢✉s✐♦♥ ∼ ✽✼ % qq ❛♥♥✐❤✐❧❛t✐♦♥ ∼ ✶✸ % ❲❤② t♦♣ ♣❛✐r st✉❞✐❡s❄ � ❙tr✐♥❣❡♥t t❡sts ♦❢ ♣◗❈❉❀ � ❤✐❣❤ s❡♥s✐t✐✈✐t② t♦ ❣❧✉♦♥ P❉❋❀ � ✐♠♣♦rt❛♥t ❜❛❝❦❣r♦✉♥❞ t♦ ❍✐❣❣s ❛♥❞ ❇❙▼ ♣r♦❝❡ss❡s❀ � ✐♠♣r♦✈❡♠❡♥t ✐♥ ▼❈ ❣❡♥❡r❛t♦rs ♦❢ t❤❡ tt s❛♠♣❧❡s✳ ❙❡r❡♥❛ P❛❧❛③③♦ ❙❡♣t❡♠❜❡r ✶✷✱ ✷✵✶✼ ✹ ✴ ✷✼

❚♦♣✲q✉❛r❦ ♣❛✐r ♣r♦❞✉❝t✐♦♥ ❚♦♣ ♣❛✐r ❞❡❝❛② � ■♥ t❤❡ ❙t❛♥❞❛r❞ ▼♦❞❡❧✱ t♦♣ q✉❛r❦s ❞❡❝❛② t♦ ❲❜ ❛❜♦✉t ✾✾✳✽✪ ♦❢ t❤❡ t✐♠❡❀ � ❞❡❝❛② s✐❣♥❛t✉r❡s ❛r❡ ❝❛t❡❣♦r✐③❡❞ ❛❝❝♦r❞✐♥❣ t♦ t❤❡ ❞❡❝❛② ♦❢ t❤❡ t✇♦ ❲✬s✱ s❡♠✐✲❧❡♣t♦♥✐❝❛❧❧② ♦r ❤❛❞r♦♥✐❝❛❧❧②❀ � ❆❧❧✲❤❛❞r♦♥✐❝✿ ❜♦t❤ ❲✬s ❞❡❝❛② ✈✐❛ ❲ → qq ✭✹✻ % ✮❀ � ℓ ✰❏❡ts✿ ♦♥❡ ❲ ❞❡❛❝❛②s ✈✐❛ ❲ → ℓν ✭✸✵ % ✮❀ � ❞✐❧❡♣t♦♥✿ ❜♦t❤ ❲✬s ❞❡❝❛② ✈✐❛ ❲ → ℓν ✭✹ % ✮✳ ❙❡r❡♥❛ P❛❧❛③③♦ ❙❡♣t❡♠❜❡r ✶✷✱ ✷✵✶✼ ✺ ✴ ✷✼

■♥❝❧✉s✐✈❡ ♠❡❛s✉r❡♠❡♥ts τ ✰ ❥❡ts tt ❝r♦ss✲s❡❝t✐♦♥ ✐♥ t❤❡ τ ✰ ❥❡ts ❝❤❛♥♥❡❧ τ ✰ ❥❡ts ✿ √ s = ✼ TeV L = ✶ . ✻✼ fb − ✶ ❊✉r✳P❤②s✳❏✳❈✭✷✵✶✸✮✼✸✿✷✸✷✽ τ ✰ ❥❡ts ✿ √ s = ✽ TeV L = ✷✵ . ✷ fb − ✶ ❛r❳✐✈✿✶✼✵✷✳✵✽✽✸✾✈✷ � ❋✐♥❛❧ st❛t❡ ✇✐t❤ ❛ ❤❛❞r♦♥✐❝❛❧❧② ❞❡❝❛②✐♥❣ τ ❧❡♣t♦♥ ❛♥❞ ❥❡ts❀ � s✉❝❤ ❛♥ ❡✈❡♥t t♦♣♦❧♦❣② ❝♦rr❡s♣♦♥❞ t♦ ∼ ✶✵ % ♦❢ tt ❞❡❝❛②s❀ � t❤✐s ♠❡❛s✉r❡♠❡♥t ✐s ♣❛rt✐❝✉❧❛r❧② ✐♠♣♦rt❛♥t ❢♦r ❝❤❛r❣❡❞ ❍✐❣❣s ❜♦s♦♥ ♣r♦❞✉❝t✐♦♥ ✐♥ t♦♣✲q✉❛r❦ ❞❡❝❛②s � t❤❡ ❡①✐st❡♥❝❡ ♦❢ ❛ H ± ✇♦✉❧❞ ❧❡❛❞ t♦ ❛♥ ❡♥❤❛♥❝❡♠❡♥t ✐♥ t❤❡ ❝r♦ss✲s❡❝t✐♦♥ ❢♦r t❤❡ ❝♦♥s✐❞❡r❡❞ tt ✜♥❛❧ st❛t❡✳ ❙❡r❡♥❛ P❛❧❛③③♦ ❙❡♣t❡♠❜❡r ✶✷✱ ✷✵✶✼ ✻ ✴ ✷✼

■♥❝❧✉s✐✈❡ ♠❡❛s✉r❡♠❡♥ts τ ✰ ❥❡ts tt ❝r♦ss✲s❡❝t✐♦♥ ✐♥ t❤❡ τ ✰ ❥❡ts ❝❤❛♥♥❡❧ ❛t √ s ❂ ✼ ❚❡❱ ❊✉r✳P❤②s✳❏✳❈✭✷✵✶✸✮✼✸✿✷✸✷✽ ❙❡r❡♥❛ P❛❧❛③③♦ ❙❡♣t❡♠❜❡r ✶✷✱ ✷✵✶✼ ✼ ✴ ✷✼

■♥❝❧✉s✐✈❡ ♠❡❛s✉r❡♠❡♥ts τ ✰ ❥❡ts τ ✰❥❡t √ s ❂ ✼ ❚❡❱✿ ❊✈❡♥t s❡❧❡❝t✐♦♥ & τ ❞❡❝❛②s ❊✈❡♥t s❡❧❡❝t✐♦♥ � ❘❡q✉✐r❡ ❛t ❧❡❛st ✺ ❥❡ts ✇✐t❤ p T > ✷✵ GeV ❛♥❞ | η | < ✷ . ✺✿ � ✷ ❥❡ts ❤❛✈✐♥❣ ♦r✐❣✐♥❛t❡❞ ❢r♦♠ b − quark ❀ � ✷ ❥❡ts ❢r♦♠ t❤❡ ❤❛❞r♦♥✐❝ ❞❡❝❛② ♦❢ ♦♥❡ ♦❢ t❤❡ t♦♣ q✉❛r❦s❀ � ✶ τ had ❝❛♥❞✐❞❛t❡ ✭ p T > ✹✵ GeV ✮ ❢r♦♠ t❤❡ ♦t❤❡r t♦♣✲q✉❛r❦✳ τ ❞❡❝❛②s � ❍❛❞r♦♥✐❝❛❧❧② ❞❡❝❛②✐♥❣ τ ✐♥✿ � ✶ ♦r ✸ ❝❤❛r❣❡❞ ❤❛❞r♦♥s ✐♥ t❤❡ ✜♥❛❧ st❛t❡ ❝❤❛r❣❡❞ ❤❛❞r♦♥s ✭✰ ♦t❤❡r ♥❡✉tr❛❧s✮❀ ❙❡r❡♥❛ P❛❧❛③③♦ ❙❡♣t❡♠❜❡r ✶✷✱ ✷✵✶✼ ✽ ✴ ✷✼